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Cape Peninsula University of Technology
1.
Mtawa, Alexander Nikwanduka.
Influence of geometry and material properties on the optimum performance of the C-shape piezo-composite actuator
.
Degree: 2008, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1301 
► In recent years, due to rapid advances in technology there has been an increasingly high demand for large displacement and large force, precise positioning, fast…
(more)
▼ In recent years, due to rapid advances in technology there has been an increasingly high
demand for large displacement and large force, precise positioning, fast response, low power
consuming miniature piezoelectric actuators.
In certain smart structure applications, the use of curved piezoelectric actuators is necessary.
The present work extends the earlier investigations on the C- shape actuator by providing a
detailed investigation on the influence of geometric and material properties of the individual
layers of the C-shape piezocomposite for its optimal performance as an actuator.
Analytical models have. been used to optimize the geometry of the actuator. Experimental
and finite element analyses (using general purpose finite element software i.e.
CoventerWare and MSC. Marc) have been used for validation.
The present work has established that, by maintaining the thickness of the substrate and
piezoceramic layers constant; changing the external radius, for example increasing it, the
stiffness of the structure decreases and thus yielding large displacement This has a negative
effect on the force produced by the actuator.
With fixed thickness of the substrate and varying the thickness of the piezoceramic (for fixed
external radius) the result is as follows: Increasing the thickness of the piezoceramic layer
has the effect of decreasing the displacement while the force increases.
With fixed PZT thickness as well as the external radius, varying the substrate thickness has
the following effect: As the thickness of the substrate increases the displacement increases
reaching a maximum. Subsequent increase in the thickness of the substrate the
displacement is reduced. The force continues increasing at least for the ratios up to 1.0,
further increase of the substrate, subsequent decrease of force is also noted. In addition to
changing the thickness of the substrate, the choice of different material for the substrate has
the following effect: For substrate/PZT ratios of up to 0.6. an actuator with substrate material
having higher elastic modulus will produce larger displacement while for ratios beyond this
ratio the situation is reversed. The causes for this kind of behaviour have been addressed.
In all cases both force and displacement are found to be directly proportional to applied
voltage.
Subjects/Keywords: Piezoelectric materials;
Piezoelectric ceramics;
Geometry
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APA (6th Edition):
Mtawa, A. N. (2008). Influence of geometry and material properties on the optimum performance of the C-shape piezo-composite actuator
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1301
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mtawa, Alexander Nikwanduka. “Influence of geometry and material properties on the optimum performance of the C-shape piezo-composite actuator
.” 2008. Thesis, Cape Peninsula University of Technology. Accessed February 24, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1301.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mtawa, Alexander Nikwanduka. “Influence of geometry and material properties on the optimum performance of the C-shape piezo-composite actuator
.” 2008. Web. 24 Feb 2021.
Vancouver:
Mtawa AN. Influence of geometry and material properties on the optimum performance of the C-shape piezo-composite actuator
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2008. [cited 2021 Feb 24].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1301.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mtawa AN. Influence of geometry and material properties on the optimum performance of the C-shape piezo-composite actuator
. [Thesis]. Cape Peninsula University of Technology; 2008. Available from: http://etd.cput.ac.za/handle/20.500.11838/1301
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Nelson Mandela Metropolitan University
2.
Raffler, Oliver.
Mechatronics based highspeed rotational piezo actuator.
Degree: 2020, Nelson Mandela Metropolitan University
URL: http://hdl.handle.net/${Handle}
;
http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:39811
► The aim of this thesis is the development of a novel mechatronics-based high speed piezo actuator for rotational and linear motion. Mainly, the thesis deals…
(more)
▼ The aim of this thesis is the development of a novel mechatronics-based high speed piezo actuator for rotational and linear motion. Mainly, the thesis deals with the development of a system for mechanical coupling of any number of piezostacks. This mechanical coupling allows the actuator to achieve a significantly increased deflection compared to current approaches. The developed concept offers the possibility of a linear or rotary motion. It is also possible to combine the two types of movement. In the first step, in order to gain a better understanding of the topic, the piezo technology and especially the existing piezo actuators and -motors are examined. Currently, the force generated by the piezo actuators is mainly transmitted by friction. The only exception is the PAD-Actuator, which transmits force by means of form locking. The concept developed here also transmits its force by means of form locking and, in addition to that, offers a novel and unique drive concept in the field of piezo actuators. In the course of this thesis a new concept for the mechanical coupling of piezo actuators was developed, simulated and subsequently manufactured. Thus the system could be examined under real conditions. The investigations carried out mainly dealt with quasi-static and dynamic investigations. In addition to that, the emission of the airborne and structure-borne noise of the system was analysed.
Subjects/Keywords: Piezoelectric materials; Piezoelectric devices; Mechatronics
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APA (6th Edition):
Raffler, O. (2020). Mechatronics based highspeed rotational piezo actuator. (Thesis). Nelson Mandela Metropolitan University. Retrieved from http://hdl.handle.net/${Handle} ; http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:39811
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Raffler, Oliver. “Mechatronics based highspeed rotational piezo actuator.” 2020. Thesis, Nelson Mandela Metropolitan University. Accessed February 24, 2021.
http://hdl.handle.net/${Handle} ; http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:39811.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Raffler, Oliver. “Mechatronics based highspeed rotational piezo actuator.” 2020. Web. 24 Feb 2021.
Vancouver:
Raffler O. Mechatronics based highspeed rotational piezo actuator. [Internet] [Thesis]. Nelson Mandela Metropolitan University; 2020. [cited 2021 Feb 24].
Available from: http://hdl.handle.net/${Handle} ; http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:39811.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Raffler O. Mechatronics based highspeed rotational piezo actuator. [Thesis]. Nelson Mandela Metropolitan University; 2020. Available from: http://hdl.handle.net/${Handle} ; http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:39811
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
3.
Hung, Ching-chieh.
Stress Analysis of Piezoelectric Circular Plates.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2009, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0212109-161229
► A finite element is formulated to analyze the deflection and stresses of circular and annular piezoelectric plates underloading of applied electrical potential. The element is…
(more)
▼ A finite element is formulated to analyze the deflection and stresses of circular and annular
piezoelectric plates underloading of applied electrical potential. The element is based on linear piezoelasticity with displacement field and electrical potential properly assumed. To obtain more accurate nodal stresses , stress recovery is applied which derive nodal stresses from the theoretically accurate stresses at Gaussin points by the least square method.
Typical example in the literature are solved by the present method , comparisons are made with those by other methods and experiments to test the validity and accuracy of the present method.
Advisors/Committee Members: Shueh-Chien Wu (chair), Chung-Fu Liu (committee member), Ming-Hua Jen (chair).
Subjects/Keywords: stress; piezoelectric
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Manager
APA (6th Edition):
Hung, C. (2009). Stress Analysis of Piezoelectric Circular Plates. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0212109-161229
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hung, Ching-chieh. “Stress Analysis of Piezoelectric Circular Plates.” 2009. Thesis, NSYSU. Accessed February 24, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0212109-161229.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hung, Ching-chieh. “Stress Analysis of Piezoelectric Circular Plates.” 2009. Web. 24 Feb 2021.
Vancouver:
Hung C. Stress Analysis of Piezoelectric Circular Plates. [Internet] [Thesis]. NSYSU; 2009. [cited 2021 Feb 24].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0212109-161229.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hung C. Stress Analysis of Piezoelectric Circular Plates. [Thesis]. NSYSU; 2009. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0212109-161229
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Ryerson University
4.
Ahmed, Rummaan, Syed.
Performance of piezoceramic sensors:.
Degree: 2013, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A2607
► This study is in continuation of the previous research conducted at Ryerson University to develop a model for active monitoring of reinforced concrete members using…
(more)
▼ This study is in continuation of the previous research conducted at Ryerson University to develop a model for active monitoring of reinforced concrete members using piezo-ceramic sensor. In the previous research large concrete beam were investigated. The following study examines the performance of piezo-ceramic sensor to monitor maturity of concrete and to evaluate crack width of large base width concrete plates. Small scale beams and large scale slabs specimens were tested under three and four points bending respectively to evaluate the effectiveness of piezo-sensors at different failure modes. Test results from small scale beams were used to model correlation between concrete crack width/strains and sensor signals. The test result indicated that piezo-sensor can be used for active concrete strength monitoring at later stages. It can also be used as an effective indicator of crack width for reinforced concrete members with small base width.
Advisors/Committee Members: Marzouk, Hesham (Thesis advisor), Ryerson University (Degree grantor).
Subjects/Keywords: Piezoelectric ceramics; Piezoelectric ceramics – -; Detectors; Detectors – -; Piezoelectric devices; Piezoelectric devices – -
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APA (6th Edition):
Ahmed, Rummaan, S. (2013). Performance of piezoceramic sensors:. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A2607
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ahmed, Rummaan, Syed. “Performance of piezoceramic sensors:.” 2013. Thesis, Ryerson University. Accessed February 24, 2021.
https://digital.library.ryerson.ca/islandora/object/RULA%3A2607.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ahmed, Rummaan, Syed. “Performance of piezoceramic sensors:.” 2013. Web. 24 Feb 2021.
Vancouver:
Ahmed, Rummaan S. Performance of piezoceramic sensors:. [Internet] [Thesis]. Ryerson University; 2013. [cited 2021 Feb 24].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2607.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ahmed, Rummaan S. Performance of piezoceramic sensors:. [Thesis]. Ryerson University; 2013. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2607
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Utah
5.
Tschaggeny, Charles.
Piezoelectric direct drive three axis high precision gimbal (Hierax).
Degree: MS;, Mechanical Engineering;, 2007, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/642/rec/888
► This paper presents a novel three axis gimbal (Hierax) actuated by linear piezoelectric motors. The Hierax will be used as part of a ground-based tracking…
(more)
▼ This paper presents a novel three axis gimbal (Hierax) actuated by linear piezoelectric motors. The Hierax will be used as part of a ground-based tracking system which compensates for innate unmanned aerial vehicle (UAV) sensor error and enables UAVs to land completely and reliably autonomously. The use of the piezoelectric motors gives the Hierax characteristics and performance unattainable with traditional electromagnetic motors such as no backlash or servo dither, extremely quick response, high torque at low speeds, minimal EMI/RFI noise and the ability to hold a position without heat generation or power as long as the external torque on the axis does not exceed the holding torque of the piezoelectric motor. The linear motion from the linear piezoelectric motors is converted into rotary motion by driving a disk around an axis of rotation. Linear motors are used because the output torque can be easily tailored to the application by either increasing the number of motors or the moment arm. The Hierax is a three axis man portable gimbal with travel of 30, 90 and 360 (continuous) degrees in the respective axes. The Hierax has achieved angular accelerations of 15,498, 19,151 and 11,159 degs/s2 and angular velocities of 554, 827 and 62 degs/s, respectively.
Subjects/Keywords: Piezoelectric devices
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APA ·
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APA (6th Edition):
Tschaggeny, C. (2007). Piezoelectric direct drive three axis high precision gimbal (Hierax). (Masters Thesis). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/642/rec/888
Chicago Manual of Style (16th Edition):
Tschaggeny, Charles. “Piezoelectric direct drive three axis high precision gimbal (Hierax).” 2007. Masters Thesis, University of Utah. Accessed February 24, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/642/rec/888.
MLA Handbook (7th Edition):
Tschaggeny, Charles. “Piezoelectric direct drive three axis high precision gimbal (Hierax).” 2007. Web. 24 Feb 2021.
Vancouver:
Tschaggeny C. Piezoelectric direct drive three axis high precision gimbal (Hierax). [Internet] [Masters thesis]. University of Utah; 2007. [cited 2021 Feb 24].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/642/rec/888.
Council of Science Editors:
Tschaggeny C. Piezoelectric direct drive three axis high precision gimbal (Hierax). [Masters Thesis]. University of Utah; 2007. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/642/rec/888
Queens University
6.
Hairsine, Kristopher Ryan.
The Design of a Scanning Tunneling Microscope for Electroluminescence Studies
.
Degree: Physics, Engineering Physics and Astronomy, 2015, Queens University
URL: http://hdl.handle.net/1974/13897
► A conventional scanning tunneling microscope (STM) provides topographical and tunneling spectra information of atomic structures. However, the extremely small lateral dimension of the tunneling filament…
(more)
▼ A conventional scanning tunneling microscope (STM) provides topographical and tunneling spectra information of atomic structures. However, the extremely small lateral dimension of the tunneling filament is also responsible for locally exciting photon emission with low-energy electrons. By combining an optical system to capture emitted photons with a conventional STM a powerful tool is realized. Optical, in addition to the geometrical and electrical, properties of atomic structures may be studied simultaneously at sub-Angstrom spatial resolution. This information could potentially be used as a means for chemically identifying individual molecules on surfaces. Furthermore, a complete understanding of luminescent molecules at the nanometer length scale could have implications with regard to nanoscale electronic devices.
This thesis presents an innovative design of a novel STM in conjunction with an optical system to study the electroluminescence of nanoscale objects. The STM features (1) a parabolic mirror as the primary optical component for photon capture, (2) simplified miniature piezoelectric actuated inertial z-motors and xy-positioning stage used to position the tunnel junction at the focal point of the parabolic mirror, (3) high photon collection efficiency equal to 0.90pi steradians and (4) capacitive displacement sensors monitoring the position of the tunnel junction in three-dimensions. This document reveals how the combination of these features makes this STM design superior to existing designs. The design of the STM, the importance of its features and the characterization of its performance are discussed in detail.
Subjects/Keywords: STM
;
Piezoelectric
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Manager
APA (6th Edition):
Hairsine, K. R. (2015). The Design of a Scanning Tunneling Microscope for Electroluminescence Studies
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/13897
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hairsine, Kristopher Ryan. “The Design of a Scanning Tunneling Microscope for Electroluminescence Studies
.” 2015. Thesis, Queens University. Accessed February 24, 2021.
http://hdl.handle.net/1974/13897.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hairsine, Kristopher Ryan. “The Design of a Scanning Tunneling Microscope for Electroluminescence Studies
.” 2015. Web. 24 Feb 2021.
Vancouver:
Hairsine KR. The Design of a Scanning Tunneling Microscope for Electroluminescence Studies
. [Internet] [Thesis]. Queens University; 2015. [cited 2021 Feb 24].
Available from: http://hdl.handle.net/1974/13897.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hairsine KR. The Design of a Scanning Tunneling Microscope for Electroluminescence Studies
. [Thesis]. Queens University; 2015. Available from: http://hdl.handle.net/1974/13897
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rutgers University
7.
Du, Wanlin.
The influence of processing parameters and material composition on the piezoelectric, dielec- tric and mechanical properties of dome-shaped pie-zoelectric actuators.
Degree: PhD, Mechanical and Aerospace Engineering, 2017, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/55461/
► Thick film (Pb ZrxTi1-x O3(0≤x≤1))-Epoxy) structures and three-phase (lead zirconate titanate ii displacements. To study the influence of the curing conditions, after the fabrication of…
(more)
▼ Thick film (Pb ZrxTi1-x O3(0≤x≤1))-Epoxy) structures and three-phase (lead zirconate titanate ii displacements. To study the influence of the curing conditions, after the fabrication of the dome-shaped devices using datum fabrication methods, four different curing conditions were employed: curing on the hotplate at 75°C with air, curing in the vacuum chamber at room temperature, curing with the air at room temperature and curing in the furnace at 75°C with air. The influences of the mechanical stirring were also studied associated with all four aforementioned curing conditions. The timing of the poling step and the duration were also studied, in this study the poling process has happened simultaneously with the curing process during the first 0.5h, 1h and 2h. After the initial curing, the samples would have finished the whole curing time with the optimized curing conditions from previous study. The study of the material composition such adding the MWCNTs has also been carried out in this work. The three-phase (PZT-Epoxy-MWCNTs) 0-3-0 dome shaped composite devices were initially fabricated with the datum fabrication procedure to nar- row down the optimized volume fractions of the MWCNTs in the composite. And the updated method was employed to further study the optimized volume fractions of the MWCNTs. The volume fraction of PZT was fixed at 0.6, and the highest values for the longi- tudinal piezoelectric coefficient (@110Hz), effective dielectric constant (@2kHz), and dielectric loss (@2kHz), were 12.507 pC/N, 90.72 and 0.00185 respectively for the MWCNTS volume fraction equal to 0.13. The piezoelectric strain coefficient d33 for this dome structure was improved 13.7% compared to that previously reported value for a composite PZT-epoxy dome structure of similar structure and composition but have fab- ricated through the datum procedures. The sample morphology was examined with the aid of scanning electron microscopy (SEM) images and the material distribution was iii iii studied by energy dispersive x-ray spectroscopy (EDS). All samples were Corona poled allowed for higher poling voltages (45 kV/mm). It has been observed that adding the magnetic stirring step, cure initially with external electric field for 1h, and finished the whole curing in the furnace offered most optimized properties, parametricallywise. Piezoelectric strain coefficients and capacitance were measured @110Hz by Piezometer, and displacement of certain volume fractions of PZT were studied by Keyence interferometer. To better examine the polarization-electric field relation, P-E hysteresis loop were measured. Other dielectric properties such as conductance, resistance, and impedance spec- transverse increasing frequency were obtained by Hp impedance analyzer within the frequency range from 2kHz to 20Mhz. Investigation of composite structures such as these may lead to development of actuators with enhanced displacement and sensors with bet- ter sensitivity.
Advisors/Committee Members: Cook-Chennault, Kimberly (chair), Cuitino, Alberto (internal member), Shojaei-Zadeh, Shahab (internal member), Berhan, Lesley (outside member), School of Graduate Studies.
Subjects/Keywords: Piezoelectric devices
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APA (6th Edition):
Du, W. (2017). The influence of processing parameters and material composition on the piezoelectric, dielec- tric and mechanical properties of dome-shaped pie-zoelectric actuators. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/55461/
Chicago Manual of Style (16th Edition):
Du, Wanlin. “The influence of processing parameters and material composition on the piezoelectric, dielec- tric and mechanical properties of dome-shaped pie-zoelectric actuators.” 2017. Doctoral Dissertation, Rutgers University. Accessed February 24, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/55461/.
MLA Handbook (7th Edition):
Du, Wanlin. “The influence of processing parameters and material composition on the piezoelectric, dielec- tric and mechanical properties of dome-shaped pie-zoelectric actuators.” 2017. Web. 24 Feb 2021.
Vancouver:
Du W. The influence of processing parameters and material composition on the piezoelectric, dielec- tric and mechanical properties of dome-shaped pie-zoelectric actuators. [Internet] [Doctoral dissertation]. Rutgers University; 2017. [cited 2021 Feb 24].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/55461/.
Council of Science Editors:
Du W. The influence of processing parameters and material composition on the piezoelectric, dielec- tric and mechanical properties of dome-shaped pie-zoelectric actuators. [Doctoral Dissertation]. Rutgers University; 2017. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/55461/
Rutgers University
8.
Szulczewski, Joshua Michael, 1984-.
Flip-through effect and bending of PVDF shallow spherical piezo-electrical switches.
Degree: PhD, Civil and Environmental Engineering, 2016, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/50189/
► The use of piezo-electrical devices is becoming more widespread. The principle of such devices was discovered to aid in the study of radiation. The piezo-device…
(more)
▼ The use of piezo-electrical devices is becoming more widespread. The principle of such devices was discovered to aid in the study of radiation. The piezo-device was found to give off an electrical charge when it was depressed. A year later, researchers also realized that not only could this device give off electrical charge, but also, if an electric charge was released into it, that it would turn that electrical charge into mechanical work. There is also study of a phenomenon called the flip effect. This effect occurs when a structure is created by fusing two materials together. For the remainder of this thesis we will use the term bi-material to describe such a structure. The flip-effect occurs when a solid structure is heated (or freeze) whereby energy is either added or removed. As a result, the structure becomes unstable in its current configuration and transitions to a new stable state. This happens because there is internal moment within the structure that gives it rigidity. This thesis looks at the equations that are related to energy for what causes the structure to become unstable and then flip to the other side. Another aspect that was looked at was how COMSOL models also demonstrate that such a structure can be created. The energy equations are related to theses COMSOL models. From the model information a structure is then built from manufactured parts. When the researcher was looking for materials to experiment piezo-electrical polymers were found. These polymers are quite new and not widely utilized at present. They have been primarily used in speaker systems. Previously, speaker systems were made of quartz, paper, or other types of vibrating materials. These polymers were selected as a basis for this thesis since they are exceptionally flexible and easy to mold. Experiments have been conducted with piezo-polymers, with results that are similar to the COMSOL and the derived equations. It was found that a fairly reliable switch can be created using the polymers; however, there are questions of cost and design constraints that have to be looked at on a case-by-case basis.
Advisors/Committee Members: Yong, Yook-Kong (chair), Najm, Husam (internal member), WANG, HAO (internal member), Ucharin, Chris (outside member).
Subjects/Keywords: Piezoelectric devices
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APA (6th Edition):
Szulczewski, Joshua Michael, 1. (2016). Flip-through effect and bending of PVDF shallow spherical piezo-electrical switches. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/50189/
Chicago Manual of Style (16th Edition):
Szulczewski, Joshua Michael, 1984-. “Flip-through effect and bending of PVDF shallow spherical piezo-electrical switches.” 2016. Doctoral Dissertation, Rutgers University. Accessed February 24, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/50189/.
MLA Handbook (7th Edition):
Szulczewski, Joshua Michael, 1984-. “Flip-through effect and bending of PVDF shallow spherical piezo-electrical switches.” 2016. Web. 24 Feb 2021.
Vancouver:
Szulczewski, Joshua Michael 1. Flip-through effect and bending of PVDF shallow spherical piezo-electrical switches. [Internet] [Doctoral dissertation]. Rutgers University; 2016. [cited 2021 Feb 24].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/50189/.
Council of Science Editors:
Szulczewski, Joshua Michael 1. Flip-through effect and bending of PVDF shallow spherical piezo-electrical switches. [Doctoral Dissertation]. Rutgers University; 2016. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/50189/
Rutgers University
9.
Sundar, Udhay, 1989-.
Dielectric and piezoelectric properties of percolative three-phase piezoelectric polymer composites.
Degree: MS, Mechanical and Aerospace Engineering, 2016, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/50193/
► Three-phase piezoelectric bulk composites were fabricated using a mix and cast method. The composites were comprised of lead zirconate titanate (PZT), aluminum (Al) and an…
(more)
▼ Three-phase
piezoelectric bulk composites were fabricated using a mix and cast method. The composites were comprised of lead zirconate titanate (PZT), aluminum (Al) and an epoxy matrix. The volume fraction of the PZT and Al were varied from 0.1 to 0.3 and 0.0 to 0.17, respectively. The influences of three entities on
piezoelectric and dielectric properties: inclusion of an electrically conductive filler (Al), poling process (contact and Corona) and Al surface treatment, were observed. The
piezoelectric strain coefficient, d33, effective dielectric constant, r, capacitance, C, and resistivity were measured and compared according to poling process, volume fraction of constituent phases and Al surface treatment. The maximum values of d33 were ~3.475 and ~1.0 pC/N for Corona and contact poled samples respectively, for samples with volume fractions of 0.40 and 0.13 of PZT and Al (surface treated) respectively. Also, the maximum dielectric constant for the surface treated Al samples was ~411 for volume fractions of 0.40 and 0.13 for PZT and Al respectively. The percolation threshold was observed to occur at an Al volume fraction of 0.13. The composites achieved a percolated state for Al volume fractions >0.13 for both contact and corona poled samples. In addition, a comparative time study was conducted to examine the influence of surface treatment processing time of Al particles. The effectiveness of the surface treatment, sample morphology and composition was observed with the aid of SEM and EDS images. These images were correlated with
piezoelectric and dielectric properties. PZT-epoxy-aluminum thick films (200 µm) were also fabricated using a two-step spin coat deposition and annealing method. The PZT volume fraction were varied from 0.2, 0.3 and 0.4, wherein the Aluminum volume fraction was varied from 0.1 to 0.17 for each PZT volume fraction, respectively. The two-step process included spin coating the first layer at 500 RPM for 30 seconds, and the second layer at 1000 RPM for 1 minute. The
piezoelectric strain coefficients d33 and d31, capacitance and the dielectric constant were measured, and were studied as a function of Aluminum volume fraction.
Advisors/Committee Members: Cook-Chennault, Kimberly (chair), Baruh, Haim (internal member), Mazzeo, Aaron (internal member).
Subjects/Keywords: Piezoelectric materials
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APA (6th Edition):
Sundar, Udhay, 1. (2016). Dielectric and piezoelectric properties of percolative three-phase piezoelectric polymer composites. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/50193/
Chicago Manual of Style (16th Edition):
Sundar, Udhay, 1989-. “Dielectric and piezoelectric properties of percolative three-phase piezoelectric polymer composites.” 2016. Masters Thesis, Rutgers University. Accessed February 24, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/50193/.
MLA Handbook (7th Edition):
Sundar, Udhay, 1989-. “Dielectric and piezoelectric properties of percolative three-phase piezoelectric polymer composites.” 2016. Web. 24 Feb 2021.
Vancouver:
Sundar, Udhay 1. Dielectric and piezoelectric properties of percolative three-phase piezoelectric polymer composites. [Internet] [Masters thesis]. Rutgers University; 2016. [cited 2021 Feb 24].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/50193/.
Council of Science Editors:
Sundar, Udhay 1. Dielectric and piezoelectric properties of percolative three-phase piezoelectric polymer composites. [Masters Thesis]. Rutgers University; 2016. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/50193/
Rutgers University
10.
Yesner, Gregory, 1991-.
Piezoelectric materials and energy harvesting using a novel transducer design.
Degree: PhD, Materials Science and Engineering, 2018, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/56159/
► Bismuth based piezoelectric ceramics such as 0.88Bi1/2Na1/2TiO3 – 0.08Bi1/2K1/2TiO3 – 0.04BaTiO3 (BNKBT88) are a promising lead-free candidate with moderate piezoelectric properties for use in in…
(more)
▼ Bismuth based
piezoelectric ceramics such as 0.88Bi1/2Na1/2TiO3 – 0.08Bi1/2K1/2TiO3 – 0.04BaTiO3 (BNKBT88) are a promising lead-free candidate with moderate
piezoelectric properties for use in in transducers, multilayer actuators (MLA), and
piezoelectric transformers. This dissertation focuses on three areas of
piezoelectric research: i) development of a BNT-based co-fired actuator with copper metal electrodes sintered at low temperature and in controlled oxygen atmosphere, ii) study the effect of A-site non-stoichiometry in BNKBT ceramics and improvement of the electrical resistivity in Bi-deficient composition for a high power transducer application, and iii) development of a prototype bridge transducer with a novel electrode pattern utilizing d33 for enhanced energy generation. i) Compatibility of Bi-based ceramics and copper electrodes was demonstrated by co-firing BNKBT88 ceramics with copper electrodes at 900 °C in controlled atmosphere with an oxygen partial pressure of 6.1x10-8 atm. A combination of additives for low temperature sintering was used for firing at 900 °C in air or controlled atmosphere with minimal effect on the
piezoelectric properties of BNKBT88 compared to sintering at 1150 °C. The oxygen atmosphere was controlled during sintering by mixing carbon dioxide and a hydrogen-nitrogen mixture. To keep the concentration of oxygen within the narrow range necessary for the coexistence of Cu metal and Bi2O3, the BNKBT88 samples were placed inside of a rectangular alumina boat and covered with a custom drilled alumina plate. A mixture of copper metal powder and cuprous oxide (Cu2O) were placed adjacent to the samples inside of the alumina boat to release or absorb excess O2. BNKBT88 ceramics were successfully co-fired with internal and surface Cu metal electrodes. ii) The effect of non-stoichiometry of A-site cations in BNKBT88 was studied. Hardening and softening of
piezoelectric properties has been observed. The most notable effect is that the mechanical quality factor, which is an essential figure of merit for high power application, is as high as 1200 for the Bi-deficient composition compared to 150 for the unmodified composition. Multilayer bismuth deficient BNKBT88 with co-fired copper metal electrodes is candidate for use in a lead-free
piezoelectric transformer. iii) A prototype novel lead zirconate titanate (PZT) bridge transducer based on the cymbal design has been developed for energy harvesting from impact loading by vehicle- induced deformations on pavement. Efficient transfer of mechanical energy from the road to the
piezoelectric transducers embedded beneath the surface is achieved through mechanical coupling of the transducer and the pavement. A busy highway can be used as a source of electrical power where the harvested energy can be transmitted to the electrical grid or used to power streetlights. The novel transducer is also a highly sensitive detector that has the potential to be used to monitor vehicles on a roadway. The novel transducers generate energy to power electronic…
Advisors/Committee Members: Safari, Ahmad (chair), Amatucci, Glenn (internal member), Birnie, Dunbar (internal member), Maher, Ali (outside member), School of Graduate Studies.
Subjects/Keywords: Piezoelectric ceramics
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APA (6th Edition):
Yesner, Gregory, 1. (2018). Piezoelectric materials and energy harvesting using a novel transducer design. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/56159/
Chicago Manual of Style (16th Edition):
Yesner, Gregory, 1991-. “Piezoelectric materials and energy harvesting using a novel transducer design.” 2018. Doctoral Dissertation, Rutgers University. Accessed February 24, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/56159/.
MLA Handbook (7th Edition):
Yesner, Gregory, 1991-. “Piezoelectric materials and energy harvesting using a novel transducer design.” 2018. Web. 24 Feb 2021.
Vancouver:
Yesner, Gregory 1. Piezoelectric materials and energy harvesting using a novel transducer design. [Internet] [Doctoral dissertation]. Rutgers University; 2018. [cited 2021 Feb 24].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/56159/.
Council of Science Editors:
Yesner, Gregory 1. Piezoelectric materials and energy harvesting using a novel transducer design. [Doctoral Dissertation]. Rutgers University; 2018. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/56159/
11.
Taghaddos, Elaheh.
Development and electro-acoustic properties of BNKLT-based piezoelectric ceramic.
Degree: PhD, Materials Science and Engineering, 2019, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/61122/
► The functionality of piezoelectric materials to interconverting the mechanical and electrical energy leads to a huge market of piezoelectric materials in a wide range of…
(more)
▼ The functionality of
piezoelectric materials to interconverting the mechanical and electrical energy leads to a huge market of
piezoelectric materials in a wide range of applications from daily use, such as a speaker, musical instrument, humidifier to more specialized applications in military, medical and automotive industries. The market of
piezoelectric is dominated by Pb(ZrxTi1-x)O3 compositions with outstanding electromechanical properties. However, it is essential to replace lead-containing
piezoelectric materials with non-toxic alternatives.
Bismuth sodium titanate and its solid solution are a promising lead-free candidate for transducer and actuators applications. The ternary solid solution of 0.88BNT-0.08BKT-0.04BLT (BNKLT88) exhibits high coercive field (Ec ~ 47 kV.cm-1), mechanical quality factor (Qm ~ 420), depolarization temperature (Td ~ 220 °C), and low dielectric loss (tan ~ 1.2%). These desired high power properties make BNT-based composition a potential lead-free candidate to replace for hard commercial PZT.
In this dissertation, an attempt has been made to study the effect of B-site Mn and Fe acceptor dopants on the mechanical quality factor of BNKLT88 ceramics and improve the high power performance. The samples were processed by conventional and flash sintering methods. The effect of sintering parameters on the crystal structure,
piezoelectric, dielectric and electrical properties have been comprehensively evaluated. The electromechanical properties were measured by the IEEE-Standard procedures. The impedance spectroscopy technique was used to characterize the electrical conductivity and impedance relaxation of the specimen. The optimum electromechanical properties were obtained at 1.5 mol% of Mn or Fe-doped composition processed by the conventional sintering method. The functionality of the (BiNa0.88 K0.08Li0.04)0.5Ti0.985Mn0.015O3 ceramic for high power application has been evaluated by prototyping of low frequency transducer.
In the conventional sintering method, the effect of both sintering temperature and the particle size on the electromechanical properties showed improved mechanical quality factor up to 1200 in calcined powder with a median particle size of 535 nm. The evaluation of the mechanical quality factor as a function of vibration velocity for high power application showed lower heat generation resulting in stable Qm at higher vibration velocity of 0.6 m.s-1 and reduction of input power by 70-75%. X-ray photoelectron microscopy study of the specimen indicated coexistence of Mn 2+/Mn+3 or Fe2+/Fe+3 in Mn or Fe-doped ceramics. In flash sintering (FS), the optimum sintering parameters to fully densify BNKL88-1.5Mn composition were achieved at 1 KHz alternating current, 100 V·cm-1 initial electric field and the preset maximum current limit of 1.5 A·cm-2. The uniform distribution of elements was observed via energy-dispersive spectroscopy. Ceramics with finer grain size of 10-15 µm, similar electromechanical properties, more symmetric butterfly shape strain, and lower resistivity have…
Advisors/Committee Members: Safari, Ahmad (chair), School of Graduate Studies.
Subjects/Keywords: Piezoelectric ceramics
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APA (6th Edition):
Taghaddos, E. (2019). Development and electro-acoustic properties of BNKLT-based piezoelectric ceramic. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/61122/
Chicago Manual of Style (16th Edition):
Taghaddos, Elaheh. “Development and electro-acoustic properties of BNKLT-based piezoelectric ceramic.” 2019. Doctoral Dissertation, Rutgers University. Accessed February 24, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/61122/.
MLA Handbook (7th Edition):
Taghaddos, Elaheh. “Development and electro-acoustic properties of BNKLT-based piezoelectric ceramic.” 2019. Web. 24 Feb 2021.
Vancouver:
Taghaddos E. Development and electro-acoustic properties of BNKLT-based piezoelectric ceramic. [Internet] [Doctoral dissertation]. Rutgers University; 2019. [cited 2021 Feb 24].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61122/.
Council of Science Editors:
Taghaddos E. Development and electro-acoustic properties of BNKLT-based piezoelectric ceramic. [Doctoral Dissertation]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61122/
Rutgers University
12.
Athavale, Abhinav A., 1990-.
An analytical model for piezoelectric unimorph cantilever subjected to an impulse load.
Degree: MS, Mechanical and Aerospace Engineering, 2015, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/47251/
► Researchers have been studying ways to harvest various ambient vibrations using piezoelectric materials to power wireless sensors and portable electronics. Literature review includes several such…
(more)
▼ Researchers have been studying ways to harvest various ambient vibrations using
piezoelectric materials to power wireless sensors and portable electronics. Literature review includes several such analytical models to harvest energy from vibrations due to the harmonic base excitation using
piezoelectric beams. These models have not explored non-harmonic forcing terms independent of frequency such as an impulse load. Presented in this thesis is an analytical model that provides exact solutions for electrical and mechanical response of a
piezoelectric unimorph cantilever beam acted upon by an impulse load at the free end. The beam is modeled using the Euler-Bernoulli assumptions. The impulse load is simulated using the delta function. Damping in the form of strain rate damping and viscous damping is taken into consideration for accurate modeling. This model can also capable of obtaining solutions for the conventional forcing terms which have been previously mentioned in the literature review. Closed form expressions for tip displacement of the beam and voltage generated across a load resistance are derived. These closed form expressions are solved using MATLAB to obtain the instantaneous values for the tip displacement and voltage generated. These instantaneous values for different load resistances are plotted as a function time using MATLAB for better visual perspective. The energy generated by harvester and the mechanical efficiency are found. From the plots it can be inferred that the particular harvester was suited for load resistances between the values of 100 Ω to 1 KΩ. The model is thus used to predict the response of a particular configuration for a
piezoelectric unimorph cantilever beam harvester which satisfies the Euler-Bernoulli assumptions and is subjected to impulse loading.
Advisors/Committee Members: Cook-Chennault, Kimberly (chair), Baruh, Haim (internal member), Mazzeo, Aaron (internal member).
Subjects/Keywords: Piezoelectric materials
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APA (6th Edition):
Athavale, Abhinav A., 1. (2015). An analytical model for piezoelectric unimorph cantilever subjected to an impulse load. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/47251/
Chicago Manual of Style (16th Edition):
Athavale, Abhinav A., 1990-. “An analytical model for piezoelectric unimorph cantilever subjected to an impulse load.” 2015. Masters Thesis, Rutgers University. Accessed February 24, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/47251/.
MLA Handbook (7th Edition):
Athavale, Abhinav A., 1990-. “An analytical model for piezoelectric unimorph cantilever subjected to an impulse load.” 2015. Web. 24 Feb 2021.
Vancouver:
Athavale, Abhinav A. 1. An analytical model for piezoelectric unimorph cantilever subjected to an impulse load. [Internet] [Masters thesis]. Rutgers University; 2015. [cited 2021 Feb 24].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/47251/.
Council of Science Editors:
Athavale, Abhinav A. 1. An analytical model for piezoelectric unimorph cantilever subjected to an impulse load. [Masters Thesis]. Rutgers University; 2015. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/47251/
AUT University
13.
Meng, Lei.
An investigation into the development of a miniature Piezoelectric pump
.
Degree: 2012, AUT University
URL: http://hdl.handle.net/10292/4458
► This thesis is aimed at improving the understanding and effectiveness in operating of the micropump in CPAP system. The principle objectives were to understand the…
(more)
▼ This thesis is aimed at improving the understanding and effectiveness in operating of the micropump in CPAP system. The principle objectives were to understand the air flow rate and air pressure of a micropump designs for the CPAP System.
The feasibility of developing a micropump using
piezoelectric fans was investigated. Input frequencies and voltages were quantified for different chambers of micropump, discharge air flow rates and air pressure. The effect of these parameters on flow rate and air pressure was determined.
To test the effect of air flow and air pressure produced by the micropump, a mathematical model of
piezoelectric fan is developed.
The experimental results with dynamic characteristics of air flow resulted in the following conclusions.
1. The vibration frequency is influential in determining the attainable pressure compared to the vibration amplitude.
2. The parallel configuration of two
piezoelectric fans excited with the same phase yields more flow rate than excited with opposite phase. The parallel configuration yields more flow rate than series configuration, but the series configuration yields higher air pressure.
3. The shapes of the flow channel, inlet and outlet have significant influence on the air flow rate and pressure.
Advisors/Committee Members: Al-Jumaily, Ahmed (advisor), Ramos, Maximiano (advisor).
Subjects/Keywords: Investigation Piezoelectric micropump;
Miniature Piezoelectric pump
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APA (6th Edition):
Meng, L. (2012). An investigation into the development of a miniature Piezoelectric pump
. (Thesis). AUT University. Retrieved from http://hdl.handle.net/10292/4458
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Meng, Lei. “An investigation into the development of a miniature Piezoelectric pump
.” 2012. Thesis, AUT University. Accessed February 24, 2021.
http://hdl.handle.net/10292/4458.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Meng, Lei. “An investigation into the development of a miniature Piezoelectric pump
.” 2012. Web. 24 Feb 2021.
Vancouver:
Meng L. An investigation into the development of a miniature Piezoelectric pump
. [Internet] [Thesis]. AUT University; 2012. [cited 2021 Feb 24].
Available from: http://hdl.handle.net/10292/4458.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Meng L. An investigation into the development of a miniature Piezoelectric pump
. [Thesis]. AUT University; 2012. Available from: http://hdl.handle.net/10292/4458
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
14.
Wu, Bing-Rung.
The fabrication of piezoelectric transducers by depositing ZnO films on PET substrates.
Degree: Master, Electrical Engineering, 2009, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804109-044040
► In this thesis, piezoelectric transducers were fabricated by depositing ZnO films on PET substrates. The optimal deposition parameters for ZnO films are sputtering pressure of…
(more)
▼ In this thesis,
piezoelectric transducers were fabricated by depositing ZnO films on PET substrates. The optimal deposition parameters for ZnO films are sputtering pressure of 15 mTorr, RF power of 75 W and oxygen concentration of 60 %, which are determined by scanning electron microscopy and X-ray diffraction analysis. PET substrates of Youngâs modulus of 6.62 GPa are obtained by Nano Indenter. To fabricate a transducer with resonance frequency of 100 Hz, the cantilever length of 0.979 cm and vibration area of 1.4835 cm2 are calculated by Cantilever Vibration Theory. Copper layer was attached to ZnO/ITO/PET structure to form
piezoelectric transducers.
A mass of 0.57 g was attached to the transducer to increase the vibration amplitude. A vibration source of 100 Hz was provided to the
piezoelectric transducer and then the experimental results were obtained by oscilloscope. The optimal thickness of ZnO films is 964.65 nm, at which the open circuit voltage is 1.87 V. A bridge rectifier was constructed by Shottky diode with product number 1N5711 along with a capacitor of 37 nF. After rectifying and filtering of device output, the maximum power of 0.0697μW/cm2 was generated with the load resistance of 5 MΩ and the internal resistance of 4.3185 MΩ.
Advisors/Committee Members: Wen-Hsi Lee (chair), Chien-Jung Huang (chair), Mau-Phon Houng (chair), Shoou-Jinn Chang (chair), Ying-Chung Chen (committee member).
Subjects/Keywords: ZnO; piezoelectric transducers
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APA ·
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Manager
APA (6th Edition):
Wu, B. (2009). The fabrication of piezoelectric transducers by depositing ZnO films on PET substrates. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804109-044040
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wu, Bing-Rung. “The fabrication of piezoelectric transducers by depositing ZnO films on PET substrates.” 2009. Thesis, NSYSU. Accessed February 24, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804109-044040.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wu, Bing-Rung. “The fabrication of piezoelectric transducers by depositing ZnO films on PET substrates.” 2009. Web. 24 Feb 2021.
Vancouver:
Wu B. The fabrication of piezoelectric transducers by depositing ZnO films on PET substrates. [Internet] [Thesis]. NSYSU; 2009. [cited 2021 Feb 24].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804109-044040.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wu B. The fabrication of piezoelectric transducers by depositing ZnO films on PET substrates. [Thesis]. NSYSU; 2009. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804109-044040
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
15.
Shelton, Christopher T.
Development of perovskite thin films for use in piezoelectric based microelectromechanical systems.
Degree: MS, Materials Science, 2009, Oregon State University
URL: http://hdl.handle.net/1957/13164
► The lead-zirconate-titanate (PZT) solid solution system is currently the workhorse of piezoelectric-based microelectromechanical systems (MEMS) research. Among bulk materials it is known to be one…
(more)
▼ The lead-zirconate-titanate (PZT) solid solution system is currently the workhorse of
piezoelectric-based microelectromechanical systems (MEMS) research. Among bulk materials it is known to be one of the strongest piezoelectrics, with extremely high
piezoelectric coefficients and electro-mechanical coupling factors. Reproducing these exceptional qualities in thin film form, however, requires precise tuning of composition and texture. In this thesis, methods to grow textured or epitaxial PZT thin films are investigated.
Solution based methods were chosen to develop conductive LaNiO3 films on biaxially textured substrates for lattice matched bottom electrodes. The goal was to maximize crystallinity and minimize resistivity through precursor modification and thermal treatments. By depositing LaNiO3 on flexible nickel alloy tapes with biaxially textured ion-beam-assisted-deposition (IBAD) MgO buffer layers, highly oriented thin
films were produced with conductivity around 600 μΩ-cm. These films are excellent template layers for PZT and other technologically interesting perovskite oxide materials. Additionally, their conductivity allows for direct fabrication of metal- insulator-metal structures.
Chemical solution deposition (CSD) and physical vapor deposition (PVD) techniques were also used to optimize orientation in PZT thin films. A comprehensive investigation of lead chemistry as well as pyrolysis and annealing conditions was performed to determine processing-structure-property relationships in PZT films. In concert, sputtering methods were also developed for comparison of thin film PZT properties from PVD and CSD routes.
Combining knowledge from the previous experiments, highly (00l) oriented PZT thin films were created by exploiting epitaxial relationships between the IBAD substrate, the LaNiO3 bottom electrode, and the active PZT layer. The resulting PZT on IBAD films showed single-crystal-like ferroelectric hysteresis loops with remnant polarization values of 40 μC/cm2, which is comparable to measured values on single crystal substrates. It is expected that these films will offer enhanced
piezoelectric actuation due to their high degree of orientation, relatively small amount of high-angle grain boundaries and their superior ferroelectric characteristics. Additionally, the flexibility of the substrate opens doors to many exciting materials integration possibilities for MEMS devices including energy harvesting applications and flexible sensors.
Advisors/Committee Members: Gibbons, Brady J. (advisor), Cann, David P. (committee member).
Subjects/Keywords: piezoelectricity; Piezoelectric materials
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APA ·
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APA (6th Edition):
Shelton, C. T. (2009). Development of perovskite thin films for use in piezoelectric based microelectromechanical systems. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/13164
Chicago Manual of Style (16th Edition):
Shelton, Christopher T. “Development of perovskite thin films for use in piezoelectric based microelectromechanical systems.” 2009. Masters Thesis, Oregon State University. Accessed February 24, 2021.
http://hdl.handle.net/1957/13164.
MLA Handbook (7th Edition):
Shelton, Christopher T. “Development of perovskite thin films for use in piezoelectric based microelectromechanical systems.” 2009. Web. 24 Feb 2021.
Vancouver:
Shelton CT. Development of perovskite thin films for use in piezoelectric based microelectromechanical systems. [Internet] [Masters thesis]. Oregon State University; 2009. [cited 2021 Feb 24].
Available from: http://hdl.handle.net/1957/13164.
Council of Science Editors:
Shelton CT. Development of perovskite thin films for use in piezoelectric based microelectromechanical systems. [Masters Thesis]. Oregon State University; 2009. Available from: http://hdl.handle.net/1957/13164
University of Manchester
16.
Qi, Shaofan.
Investigation of a novel multiresonant beam energy
harvester and a complex conjugate matching circuit.
Degree: 2011, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:120197
► The aim of the work described in this thesis is firstly to improve the collection of vibration energy for piezoelectric cantilever harvesters, by a mechanical…
(more)
▼ The aim of the work described in this thesis is
firstly to improve the collection of vibration energy for
piezoelectric cantilever harvesters, by a mechanical technique, so
that the devices can harvest energy over a wider bandwidth.
Secondly to investigate a new circuit topology for achieving
complex conjugate load matching to the piezoelectric harvester. The
thesis has been divided into two parts – the mechanical approach
and the electrical approach.For the mechanical approach, a novel
multiresonant beam, comprising piezoelectric fiber composites on a
clamped-clamped beam and side mounted cantilevers, was proposed.
The side cantilevers are tuned by tip masses to be resonant at
different frequencies. A Rayleigh-Ritz model was developed to
predict the vibration response of the proposed model multiresonant
beam. This model showed that the bandwidth of the multiresonant
beam was increased over that of a single cantilever harvester.A
multiresonant beam for energy harvesting was experimentally tested
and compared with a single cantilever energy harvester. The
transmissibility and voltage responses were investigated, the beam
showed a wide frequency response between 14.5Hz and 31Hz, whereas
the single cantilever only showed one resonant frequency. Therefore
the multiresonant beam system is feasible for wide band energy
harvesting.For the electrical approach, the task was to investigate
complex conjugate impedance matching for the piezoelectric energy
harvesters, so that the output impedance from the piezoelectric
harvester can be reduced, and maximum energy extracted from the
device with a possibility of frequency tuning. A new amplified
inductor circuit was proposed to enable the capacitive output
impedance of the piezoelectric device to be cancelled. Experimental
and software simulations are provided to verify the theoretical
predictions.A prototype amplified inductor circuit was simulated
and tested. The results showed that a variable effective inductance
was achieved. However the circuit is lossy due to imperfections
within the system, and needs further work to eliminate these
imperfections.
N/A
N/A
Advisors/Committee Members: Shuttleworth, Roger.
Subjects/Keywords: piezoelectric; energy harvesting
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APA (6th Edition):
Qi, S. (2011). Investigation of a novel multiresonant beam energy
harvester and a complex conjugate matching circuit. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:120197
Chicago Manual of Style (16th Edition):
Qi, Shaofan. “Investigation of a novel multiresonant beam energy
harvester and a complex conjugate matching circuit.” 2011. Doctoral Dissertation, University of Manchester. Accessed February 24, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:120197.
MLA Handbook (7th Edition):
Qi, Shaofan. “Investigation of a novel multiresonant beam energy
harvester and a complex conjugate matching circuit.” 2011. Web. 24 Feb 2021.
Vancouver:
Qi S. Investigation of a novel multiresonant beam energy
harvester and a complex conjugate matching circuit. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Feb 24].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:120197.
Council of Science Editors:
Qi S. Investigation of a novel multiresonant beam energy
harvester and a complex conjugate matching circuit. [Doctoral Dissertation]. University of Manchester; 2011. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:120197
Penn State University
17.
Goldschmidt, Margalit Zipora.
Unsteady Force Measurement Using Small Piezoelectric End Sensors.
Degree: 2014, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/22842
► Most marine propellers operate in a nonuniform flow field. Understanding the unsteady lift generated on the propeller blades by these upstream wakes is important in…
(more)
▼ Most marine propellers operate in a nonuniform flow field. Understanding the unsteady lift generated on the propeller blades by these upstream wakes is important in order to reduce vibration and noise and therefore develop more efficient turbomachines. Currently, complex instrumentation involving unsteady dynamometry and pressure sensor arrays are utilized to characterize the unsteady pressures across propeller blades. New, simpler sensors have been designed to replace current instrumentation. These sensors take advantage of the oscillating nature of the unsteady lift, as at increasing inflow harmonics the rapidity of the unsteady lift fluctuations suggests that the lift nearly cancels out over the blade radius, and that the total unsteady force across a propeller blade can be found from parameters at the root and tip. These parameters were determined from an approximation provided by the Method of the Stationary Phase. Using this method, new sensors were designed and optimized to work universally. The newly designed sensors will be validated in a future experiment.
Advisors/Committee Members: Michael Lester Jonson, Thesis Advisor/Co-Advisor, George A Lesieutre, Thesis Advisor/Co-Advisor.
Subjects/Keywords: unsteady; piezoelectric; dynamometry
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Manager
APA (6th Edition):
Goldschmidt, M. Z. (2014). Unsteady Force Measurement Using Small Piezoelectric End Sensors. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22842
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Goldschmidt, Margalit Zipora. “Unsteady Force Measurement Using Small Piezoelectric End Sensors.” 2014. Thesis, Penn State University. Accessed February 24, 2021.
https://submit-etda.libraries.psu.edu/catalog/22842.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Goldschmidt, Margalit Zipora. “Unsteady Force Measurement Using Small Piezoelectric End Sensors.” 2014. Web. 24 Feb 2021.
Vancouver:
Goldschmidt MZ. Unsteady Force Measurement Using Small Piezoelectric End Sensors. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Feb 24].
Available from: https://submit-etda.libraries.psu.edu/catalog/22842.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Goldschmidt MZ. Unsteady Force Measurement Using Small Piezoelectric End Sensors. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22842
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
18.
Margevicius, Madeline Alma.
SENSITIZING ENERGETIC MATERIALS USING PIEZOELECTRICITY.
Degree: 2019, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/16317mam646
► The ability to control energetic materials has been studied extensively throughout the years. Various ideas have been researched, but little research has focused on utilizing…
(more)
▼ The ability to control energetic materials has been studied extensively throughout the years. Various ideas have been researched, but little research has focused on utilizing the
piezoelectric effect to control sensitivity, which can include ignition, burning rate, and detonation. Previous work has demonstrated that the
piezoelectric properties of polyvinylidene fluoride (PVDF), which are comparable to ceramics, may contribute to a higher sensitivity in nanocomposite energetic materials. This sensitization can be activated by a voltage potential through the material. Previous studies also investigated combustion and sensitivity of PVDF/aluminum particle composites, but with limited or no characterization of the corresponding
piezoelectric properties and response.
This research focused on the formulation and combustion of PVDF/nanoaluminum (nAl) composite materials. Two combustion experiments were explored: ignition and burn rate. For ignition experiments, thin composite films approximately 50 µm thick containing varying compositions of PVDF-TrFE (trifluoroethlyene) and nanoaluminum (86nm) particles were formulated, and silver electrodes were sputtered onto the surface. To achieve the
piezoelectric effect, the materials were poled by applying an electric field, which was verified through measurement of
piezoelectric coefficient (d33). The
piezoelectric samples were tested through ignition experiments and compared to the unpoled samples with and without an applied electric field through varying the time the sample was exposed to the laser, used as the ignition source. For burn rate experiments, the amount of nanoaluminum was varied for the PVDF-TrFE/nAl composite films, and the burn rate was measured. Polarization effects were explored through PVDF-TrFE-CFE (chlorofluoroethlyene)/nAl composite material burn rate experiments by applying an electric field to the composite film during propagation.
It was found that the necessary composition for the ignition experiments was 8wt% nanoaluminum, which allowed for the sample to be poled at a high voltage potential, but also for ignition to occur. Ignition experiments showed increases in sensitivity for samples that were poled and had an applied electric field. The average ignition time decreased from 138 ms for unpoled samples without an applied electric field to 92 ms for
piezoelectric samples with an electric field. Little change was seen in samples that were poled without an applied electric field and unpoled with an applied electric field to the control samples, indicating that the
piezoelectric effect was the contributing factor to sensitivity increases. Finally, burn rate experiments confirmed that 40wt% nanoaluminum was the optimal composition of the films tested, with a burn rate of 106 mm/s. Applying an electric field to the terpolymer composite samples increased the burn rate by 47%.
While more experiments must be conducted, these results further previous studies to demonstrate that piezoelectricity contributes to increases in sensitivity in both ignition and burn…
Advisors/Committee Members: Richard A Yetter, Thesis Advisor/Co-Advisor, Jacqueline Antonia O'Connor, Committee Member, Karen Ann Thole, Committee Member.
Subjects/Keywords: Piezoelectric; Fluoropolymer; Combustion
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APA (6th Edition):
Margevicius, M. A. (2019). SENSITIZING ENERGETIC MATERIALS USING PIEZOELECTRICITY. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16317mam646
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Margevicius, Madeline Alma. “SENSITIZING ENERGETIC MATERIALS USING PIEZOELECTRICITY.” 2019. Thesis, Penn State University. Accessed February 24, 2021.
https://submit-etda.libraries.psu.edu/catalog/16317mam646.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Margevicius, Madeline Alma. “SENSITIZING ENERGETIC MATERIALS USING PIEZOELECTRICITY.” 2019. Web. 24 Feb 2021.
Vancouver:
Margevicius MA. SENSITIZING ENERGETIC MATERIALS USING PIEZOELECTRICITY. [Internet] [Thesis]. Penn State University; 2019. [cited 2021 Feb 24].
Available from: https://submit-etda.libraries.psu.edu/catalog/16317mam646.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Margevicius MA. SENSITIZING ENERGETIC MATERIALS USING PIEZOELECTRICITY. [Thesis]. Penn State University; 2019. Available from: https://submit-etda.libraries.psu.edu/catalog/16317mam646
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
19.
Zhuang, Yuan.
LOSS PHENOMENOLOGY AND THE METHODOLOGY TO DERIVE LOSS FACTORS IN PIEZOELECTRIC CERAMICS
.
Degree: 2011, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/12219
► The key factor for the miniaturization of piezoelectric devices is the power density, which is limited by the heat generation or internal losses. With accelerating…
(more)
▼ The key factor for the miniaturization of
piezoelectric devices is the power density, which is limited by the heat generation or internal losses. With accelerating the commercialization of
piezoelectric actuators and transducers, it becomes more and more significant to clarify the loss phenomenology, reduce the hysteresis losses, and increase the mechanical quality factor to enhance the efficiency and performance.
There are three loss components for
piezoelectric vibrators, i.e., dielectric, elastic and
piezoelectric losses. These loss factors are related with mechanical quality factors, which are the figure of merit of the material or device in the sense of efficiency. In order to obtain the mechanical quality factor Qm, IEEE standard provided the measurement method using the resonance and antiresonance frequencies. However, this characterization assumes that the Q value at resonance is equal to the one at antiresonance all the time, which is not consistent with experiment results. For practical materials there is sometimes a big difference between the mechanical quality factors of the resonance (QA) and the antiresonance (QB), and in most cases higher QB can be observed. Therefore, in recent several years we are focusing on a new resonance AC drive methodology to measure the admittance curve accurately around both the resonance and antiresonance peaks for
piezoelectric materials, from which QA and QB can be derived by the 3dB method. Various
piezoelectric materials were characterized with this technique.
Further, the equations were derived showing the relations between quality factors and loss factors by the complex analysis of the admittance/ impedance expressions for specific
piezoelectric vibrators. Using QA, QB, and the electromechanical coupling factor k, we can obtain three types of loss factors precisely. Among various vibration modes of
piezoelectric vibrators, we focus on k31, kt, k33, kp, and k15 modes, which cover all the 20 parameters of the ferroelectric material with ∞mm/6mm crystal symmetry, i.e.
piezoelectric ceramic. Plus some other derivations using the fundamental correlations, 20 loss factors can be obtained for all parameters. Using this technique the
piezoelectric loss factor is confirmed to be comparable to dielectric and elastic losses and it is the factor that determines whether QB is larger than QA, though it was previously neglected by most researchers. After getting the full loss matrices, the loss anisotropy was accordingly discussed, and the extensive loss factor was verified to be smaller than the intensive one.
This methodology is an essential supplement to the current IEEE standard on
piezoelectric characterization. The simplicity and accuracy of this technique are very attractive, and hopefully this proposal will be widely accepted as a standard in the
piezoelectric community in the future. The inclusion of three loss factors is important for the admittance analysis and thermal simulation of
piezoelectric devices in the “finite element method” software. Furthermore, taking…
Advisors/Committee Members: Kenji Uchino, Dissertation Advisor/Co-Advisor, Kenji Uchino, Committee Chair/Co-Chair, Leslie Eric Cross, Committee Member, Shizhuo Yin, Committee Member, Clive A Randall, Committee Member, Shujun Zhang, Committee Member.
Subjects/Keywords: loss characterization; piezoelectric
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APA ·
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Manager
APA (6th Edition):
Zhuang, Y. (2011). LOSS PHENOMENOLOGY AND THE METHODOLOGY TO DERIVE LOSS FACTORS IN PIEZOELECTRIC CERAMICS
. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/12219
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhuang, Yuan. “LOSS PHENOMENOLOGY AND THE METHODOLOGY TO DERIVE LOSS FACTORS IN PIEZOELECTRIC CERAMICS
.” 2011. Thesis, Penn State University. Accessed February 24, 2021.
https://submit-etda.libraries.psu.edu/catalog/12219.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhuang, Yuan. “LOSS PHENOMENOLOGY AND THE METHODOLOGY TO DERIVE LOSS FACTORS IN PIEZOELECTRIC CERAMICS
.” 2011. Web. 24 Feb 2021.
Vancouver:
Zhuang Y. LOSS PHENOMENOLOGY AND THE METHODOLOGY TO DERIVE LOSS FACTORS IN PIEZOELECTRIC CERAMICS
. [Internet] [Thesis]. Penn State University; 2011. [cited 2021 Feb 24].
Available from: https://submit-etda.libraries.psu.edu/catalog/12219.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhuang Y. LOSS PHENOMENOLOGY AND THE METHODOLOGY TO DERIVE LOSS FACTORS IN PIEZOELECTRIC CERAMICS
. [Thesis]. Penn State University; 2011. Available from: https://submit-etda.libraries.psu.edu/catalog/12219
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
20.
Shivashankar, P.
Analytical Modelling and Non-linear Characterisation of Piezoelectric Materials for Actuation and Vibration Control of Beams.
Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/4011
► The use of piezoelectric materials for actuation, and vibration suppression of thin beams, is the subject of study in this doctoral thesis. The initial focus…
(more)
▼ The use of
piezoelectric materials for actuation, and vibration suppression of thin beams, is the
subject of study in this doctoral thesis. The initial focus is set on reducing beam vibrations with resistively shunted
piezoelectric patches, where the converted electrical energy is dissipated by the resistor to give an additional damping. The amount of additional damping achieved depends on the value of shunted resistor, the dimensions of the
piezoelectric, and its location on the substructure. Hence, the resistively shunted
piezoelectric-beam was modelled to determine the optimal values, and to examine its dynamics. A multi-modal model was derived based on the Euler-Bernoulli beam theory, and a reduced non-dimensionalized transfer function was obtained from the multi-modal model. The presented model was derived from assumptions which aptly describe the dynamics of the resistively shunted
piezoelectric-beam. The aptness of the presented model in representing the system, over the existing models, was evident from the comparison of the analytical predictions with the existing experimental data.
With the model derived, the second part of the work deals with determining the value of resistance which would yield maximum amplitude attenuation (referred as the optimal resistance value). A method for obtaining the optimal resistance value from the analytical model, based on the presence of a fixed-point in the amplitude response, exists in the literature. But, this method cannot be used on the presented analytical model, as it includes the base-damping of the structure. Hence, a different approach was adopted to determine the optimal resistance from the analytical model. Analytical results were also validated with experimental results from a cantilever
piezoelectric-beam.
The amplitude plots of the first, second, and third modes of the
piezoelectric-beam exhibited a softening e ect, indicating a non-linear behaviour of the
piezoelectric patches. Hence, a non-linear constitutive equation was required to describe the behaviour of the
piezoelectric patches. In the third part of the work, a two-step experimental procedure was devised to construct the non-linear constitutive equation of the
piezoelectric actuators. In the first step, the
piezoelectric patches were short circuited and a family of displacement curves were obtained for the first, second and third modes of the
piezoelectric-beam by base excitation. The pro le of backbone curves from these plots were used to identify the type of non-linear terms required to describe the mechanical domain. In the second step, voltage excitation was used to obtain a similar set of displacement curves. A comparison of the profile of the backbone curves, of the displacement frequency response plot, from the voltage excited data with those from the base excited data, lead to the identification of the non-linear electromechanical coupling term. The constitutive equation, which accounts for the non-linear nature, of the
piezoelectric actuator contains (apart from the linear terms) a quadratic…
Advisors/Committee Members: Kandagal, S B (advisor), Venkatraman, Kartik (advisor).
Subjects/Keywords: Piezoelectric Materials; Piezoelectric-beams; Piezoelectric Actuators; Piezoelectric Patches; Piezoelectrics; Beams - Vibrationa Control; Areospace Engineering
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APA (6th Edition):
Shivashankar, P. (2018). Analytical Modelling and Non-linear Characterisation of Piezoelectric Materials for Actuation and Vibration Control of Beams. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/4011
Chicago Manual of Style (16th Edition):
Shivashankar, P. “Analytical Modelling and Non-linear Characterisation of Piezoelectric Materials for Actuation and Vibration Control of Beams.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed February 24, 2021.
http://etd.iisc.ac.in/handle/2005/4011.
MLA Handbook (7th Edition):
Shivashankar, P. “Analytical Modelling and Non-linear Characterisation of Piezoelectric Materials for Actuation and Vibration Control of Beams.” 2018. Web. 24 Feb 2021.
Vancouver:
Shivashankar P. Analytical Modelling and Non-linear Characterisation of Piezoelectric Materials for Actuation and Vibration Control of Beams. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Feb 24].
Available from: http://etd.iisc.ac.in/handle/2005/4011.
Council of Science Editors:
Shivashankar P. Analytical Modelling and Non-linear Characterisation of Piezoelectric Materials for Actuation and Vibration Control of Beams. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/4011
Oregon State University
21.
Brookshire, Kirsten L.
Synthesis and characterization of Pb(Zr,Ti)O₃ thin films for microelectromechanical systems.
Degree: MS, Materials Science, 2011, Oregon State University
URL: http://hdl.handle.net/1957/25794
► Pb(Zr,Ti)O₃ (PZT) is a very attractive material for use in piezoelectric-based microelectromechanical systems (MEMS) due to its high piezoelectric coefficients and ability for large displacements…
(more)
▼ Pb(Zr,Ti)O₃ (PZT) is a very attractive material for use in
piezoelectric-based
microelectromechanical systems (MEMS) due to its high
piezoelectric coefficients and
ability for large displacements with relatively low applied fields (as compared to
electrostatic-based MEMS). The
piezoelectric effect is strongly anisotropic, thus it is
very desirable to control the crystallographic orientation of the active material. This
study is designed to understand the effect of crystallographic texture on the long-term
stability of
piezoelectric-based MEMS devices. Utilizing (100)-oriented solution
deposited LaNiO₃ (LNO) and PbTiO₃ (PT) seed layers, (001) fiber texture of rfmagnetron
sputtered PZT films (ex situ annealed) with varying thickness was
optimized.
X-ray diffraction rocking curve data indicated good out-of-plane alignment,
with full-width-at-half-maximum (FWHM) values of 3.8° - 4.5° and 2.5°- 3.1° for
PZT on LNO and PT, respectively. This optimization of (001) orientation is
paramount to maximizing the
piezoelectric response of PZT thin films for MEMS
applications, as this promotes the highest
piezoelectric response. Dielectric and
ferroelectric properties were obtained for films 120-1320 nm thick. Subsequently these
films were subjected to lifetime (fatigue) tests similar to what is experienced in piezo-
MEMS applications. Fatigue endurance is a critical factor in evaluating long-term
device reliability in these devices. A study of fatigue dependence on film thickness,
morphology, bottom electrode, and field strength was conducted.
Results of these studies show film morphology contributes strongly to film
fatigue and film failure prior to reaching 10⁸ fatigue cycles, with increased grain size
leading to improved fatigue endurance. Film thickness was also shown to contribute
significantly to fatigue, predominantly in PZT on PT films, with films over 1 μm in
thickness showing large fatigue after 10⁸ cycles. Films with bottom LNO electrodes
demonstrated improved performance over all thickness ranges studied when compared to PT bottom electrodes, exhibiting minimal fatigue after 10⁸ cycles.
Advisors/Committee Members: Gibbons, Brady (advisor), Cann, David (committee member).
Subjects/Keywords: Piezoelectric; Thin films
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Manager
APA (6th Edition):
Brookshire, K. L. (2011). Synthesis and characterization of Pb(Zr,Ti)O₃ thin films for microelectromechanical systems. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/25794
Chicago Manual of Style (16th Edition):
Brookshire, Kirsten L. “Synthesis and characterization of Pb(Zr,Ti)O₃ thin films for microelectromechanical systems.” 2011. Masters Thesis, Oregon State University. Accessed February 24, 2021.
http://hdl.handle.net/1957/25794.
MLA Handbook (7th Edition):
Brookshire, Kirsten L. “Synthesis and characterization of Pb(Zr,Ti)O₃ thin films for microelectromechanical systems.” 2011. Web. 24 Feb 2021.
Vancouver:
Brookshire KL. Synthesis and characterization of Pb(Zr,Ti)O₃ thin films for microelectromechanical systems. [Internet] [Masters thesis]. Oregon State University; 2011. [cited 2021 Feb 24].
Available from: http://hdl.handle.net/1957/25794.
Council of Science Editors:
Brookshire KL. Synthesis and characterization of Pb(Zr,Ti)O₃ thin films for microelectromechanical systems. [Masters Thesis]. Oregon State University; 2011. Available from: http://hdl.handle.net/1957/25794
Penn State University
22.
Brova, Michael J.
PROCESSING AND PROPERTIES OF HIGH COERCIVE FIELD TEXTURED PIEZOELECTRIC CERAMICS.
Degree: 2020, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/18084mjb5893
► The current generation of textured piezoelectric ceramics are primarily limited in high power applications by low coercive fields (Ec), low tetragonal to rhombohedral phase transition…
(more)
▼ The current generation of textured
piezoelectric ceramics are primarily limited in high power applications by low coercive fields (Ec), low tetragonal to rhombohedral phase transition temperatures (Trt), and low Curie temperatures (TC). Over the past decade, numerous studies have shown that both Pb(In1/2Nb1/2)O3-Pb(Zn1/3Nb2/3)O3-PbTiO3 (PIN-PZN-PT) and Pb(Yb1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PYN-PMN-PT) ceramics both have higher Ec’s and phase transition temperatures. However, random PIN-PZN-PT and PYN-PMN-PT ceramics show comparably low piezoelectricity compared to textured Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 and Pb(Mg1/3Nb2/3)O3-PbZrO3-PbTiO3 ceramics. To realize high-strain textured piezoelectrics with coercive fields and phase transition temperatures that exceed those of the current generation, this dissertation explores the processing, templated grain growth, and electromechanical properties of random and textured PIN-PZN-PT and PYN-PMN-PT ceramics.
A major challenge in the development of textured PIN-PZN-PT ceramics is the synthesis of phase pure perovskite powder. The role of ZnO-doping was investigated in the phase formation of perovskite PIN-PZN-PT powder. ZnO dopant concentrations of 0.04 – 0.83 mol% increased the rate of perovskite formation and resulted in nearly phase pure powder. ZnO doping promoted perovskite formation by increasing the reactivity of an intermediate Zn-based pyrochlore phase by substituting on Nb5+ sites and forming oxygen vacancies. Because of the associated oxygen control, it is shown that phase pure powder can be achieved during synthesis.
The role of ZnO-doping was related to the densification and electromechanical properties of PIN-PZN-PT ceramics. ZnO-doping enhanced the rate and degree of sintering of PIN-PZN-PT due to the formation of oxygen vacancies. Incorporation of Zn2+ into the perovskite lattice increased the tetragonal character of PIN-PZN-PT, resulting in an increased Curie temperature and tetragonal splitting of the <200> peaks. Sintering in flowing oxygen reduced the solubility of Zn2+ into the perovskite lattice and resulted in the formation of rhombohedral PIN-PZN-PT perovskite. Oxygen sintering resulted in ZnO-doped PIN-PZN-PT ceramics with a large
piezoelectric coefficient (d33 ~ 550 pC/N), large coercive field (Ec ~ 13 kV/cm), and high rhombohedral to tetragonal phase transition temperature (Trt ~ 165°C). It was determined that PIN-PZN-PT does not nucleate on barium titanate templates and thus texturing by TGG was not successful.
High PYN-content PYN-PMN-PT ceramics are challenging to texture due to limited grain growth. A PbO-CuO liquid phase was shown to promote the grain growth of 21PYN-41PMN-38PT ceramics barium titanate platelets, and thus enable templated grain growth of high Ec PYN-PMN-PT ceramics. Texturing increased the strain behavior by 83% compared to random 21PYN-41PMN-38PT ceramics. Textured 21PYN-41PMN-38PT had a high coercive field of 13.9 kV/cm and high TC of 224°C.
The composition of textured high coercive field PYN-PMN-PT was related…
Advisors/Committee Members: Gary Lynn Messing, Dissertation Advisor/Co-Advisor, Gary Lynn Messing, Committee Chair/Co-Chair, Richard J. Meyer, Dissertation Advisor/Co-Advisor, Jon-Paul Maria, Committee Member, Michael T Lanagan, Outside Member, Mark Andrew Fanton, Special Member, John C Mauro, Program Head/Chair, Richard Joseph Meyer, Jr., Committee Chair/Co-Chair.
Subjects/Keywords: Piezoelectric; Texture; Sintering
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Manager
APA (6th Edition):
Brova, M. J. (2020). PROCESSING AND PROPERTIES OF HIGH COERCIVE FIELD TEXTURED PIEZOELECTRIC CERAMICS. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/18084mjb5893
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Brova, Michael J. “PROCESSING AND PROPERTIES OF HIGH COERCIVE FIELD TEXTURED PIEZOELECTRIC CERAMICS.” 2020. Thesis, Penn State University. Accessed February 24, 2021.
https://submit-etda.libraries.psu.edu/catalog/18084mjb5893.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Brova, Michael J. “PROCESSING AND PROPERTIES OF HIGH COERCIVE FIELD TEXTURED PIEZOELECTRIC CERAMICS.” 2020. Web. 24 Feb 2021.
Vancouver:
Brova MJ. PROCESSING AND PROPERTIES OF HIGH COERCIVE FIELD TEXTURED PIEZOELECTRIC CERAMICS. [Internet] [Thesis]. Penn State University; 2020. [cited 2021 Feb 24].
Available from: https://submit-etda.libraries.psu.edu/catalog/18084mjb5893.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Brova MJ. PROCESSING AND PROPERTIES OF HIGH COERCIVE FIELD TEXTURED PIEZOELECTRIC CERAMICS. [Thesis]. Penn State University; 2020. Available from: https://submit-etda.libraries.psu.edu/catalog/18084mjb5893
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Texas – Austin
23.
Joseph, Nicholas John.
A comparison of models for a piezoelectric 31-mode segmented cylindrical transducer.
Degree: MSin Engineering, Mechanical Engineering, 2013, University of Texas – Austin
URL: http://hdl.handle.net/2152/23565
► Piezoelectric transducers with cylindrical geometry are often designed to operate in a radial “breathing” mode. In order to tune their performance in a cost effective…
(more)
▼ Piezoelectric transducers with cylindrical geometry are often designed to operate in a radial “breathing” mode. In order to tune their performance in a cost effective way, cylinders can be constructed of alternating active (
piezoelectric) and inactive (non-
piezoelectric) staves. Existing lumped parameter models for such a ring are based on effective
piezoelectric properties of the composite ring which reduce the system to a single degree of freedom corresponding to the breathing motion. Unfortunately, if the length of the staves is a sufficiently large percentage of the circumference, the transducer may demonstrate a detrimental higher frequency resonance within the desired bandwidth of operation even when all staves are uniformly excited by an electrical field. This parasitic resonance results from bending motion of the staves associated with stiffness and mass discontinuities of the constituent material properties and can significantly decrease the radiated acoustic pressure and generate distortion of the radiated acoustic waveform. This work presents a multiple-degree-of-freedom lumped parameter model that captures both the breathing and bending resonances of the transducer and provides a more accurate prediction of its effective coupling coefficient. Results are compared with a one-degree-of-freedom model, finite element models, and experimental data. Modifications to account for internal volumes, nonlinearities, and other effects are also presented and discussed.
Advisors/Committee Members: Wilson, Preston S. (advisor), Haberman, Michael R. (advisor).
Subjects/Keywords: Transducers; Acoustics; Piezoelectric
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APA (6th Edition):
Joseph, N. J. (2013). A comparison of models for a piezoelectric 31-mode segmented cylindrical transducer. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/23565
Chicago Manual of Style (16th Edition):
Joseph, Nicholas John. “A comparison of models for a piezoelectric 31-mode segmented cylindrical transducer.” 2013. Masters Thesis, University of Texas – Austin. Accessed February 24, 2021.
http://hdl.handle.net/2152/23565.
MLA Handbook (7th Edition):
Joseph, Nicholas John. “A comparison of models for a piezoelectric 31-mode segmented cylindrical transducer.” 2013. Web. 24 Feb 2021.
Vancouver:
Joseph NJ. A comparison of models for a piezoelectric 31-mode segmented cylindrical transducer. [Internet] [Masters thesis]. University of Texas – Austin; 2013. [cited 2021 Feb 24].
Available from: http://hdl.handle.net/2152/23565.
Council of Science Editors:
Joseph NJ. A comparison of models for a piezoelectric 31-mode segmented cylindrical transducer. [Masters Thesis]. University of Texas – Austin; 2013. Available from: http://hdl.handle.net/2152/23565
University of Texas – Austin
24.
Garcia, Juan Elias.
Piezoelectric transducer built-in self-test for logging while drilling instrument sensor evaluation at rig site.
Degree: MSin Engineering, Electrical and Computer Engineering, 2014, University of Texas – Austin
URL: http://hdl.handle.net/2152/26344
► Logging While Drilling (LWD) instruments used in oil and gas exploration are subjected to extreme environmental conditions that make reliable operation a major challenge. The…
(more)
▼ Logging While Drilling (LWD) instruments used in oil and gas exploration are subjected to extreme environmental conditions that make reliable operation a major challenge. The sensors directly exposed to this environment experience accelerated aging and may suffer physical damage leading to failure. The cost of drilling and rig operations is very high magnifying any failures or issues with LWD tools. The goal of this report is to present a built-in self-test for an instrument sensor that provides a means to evaluate sensor functionality. The sensor is a
piezoelectric ultrasonic transducer. A brief review of the sensor physics will be given. I will review some methods for characterizing
piezoelectric ceramic materials and transducers. The application of sensor test methods is applied in an ultrasound pulse-echo application. A brief review of the application circuit will be covered including state of the art in commercial ultrasound integrated circuit design. A prototype of the BIST method is evaluated using test transducers to verify the circuit provides indication of a transducers ability to function correctly. The prototype is achieved through the AD5933 demo board and MATLAB is used for data processing.
Advisors/Committee Members: Touba, Nur A. (advisor).
Subjects/Keywords: Piezoelectric Sensor; BIST
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APA (6th Edition):
Garcia, J. E. (2014). Piezoelectric transducer built-in self-test for logging while drilling instrument sensor evaluation at rig site. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/26344
Chicago Manual of Style (16th Edition):
Garcia, Juan Elias. “Piezoelectric transducer built-in self-test for logging while drilling instrument sensor evaluation at rig site.” 2014. Masters Thesis, University of Texas – Austin. Accessed February 24, 2021.
http://hdl.handle.net/2152/26344.
MLA Handbook (7th Edition):
Garcia, Juan Elias. “Piezoelectric transducer built-in self-test for logging while drilling instrument sensor evaluation at rig site.” 2014. Web. 24 Feb 2021.
Vancouver:
Garcia JE. Piezoelectric transducer built-in self-test for logging while drilling instrument sensor evaluation at rig site. [Internet] [Masters thesis]. University of Texas – Austin; 2014. [cited 2021 Feb 24].
Available from: http://hdl.handle.net/2152/26344.
Council of Science Editors:
Garcia JE. Piezoelectric transducer built-in self-test for logging while drilling instrument sensor evaluation at rig site. [Masters Thesis]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/26344
University of Bath
25.
Lewis, Rhodri.
Innovation of a piezoelectric touch trigger probe.
Degree: PhD, 2012, University of Bath
URL: https://researchportal.bath.ac.uk/en/studentthesis/innovation-of-a-piezoelectric-touch-trigger-probe(381c4b36-b2ba-4c34-8fb9-251d4ee60716).html
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616579
► Today the need for mass produced items is ever growing with the demand for reproducible parts to be of a high precision. The introduction of…
(more)
▼ Today the need for mass produced items is ever growing with the demand for reproducible parts to be of a high precision. The introduction of co-ordinate measuring machines (CMM) has seen the ability to inspect produced 3D parts at faster speeds combined with high precision. The measurements with a CMM are carried out by a touch trigger probe at the interface between the produced part and machine. The probe system includes a stylus tip which makes contact with the workpiece and a probe head where the sensing technology is housed. The probe head and tip are connected by a shaft, typically constructed from steel or graphite fibre. The registration of a touch must be achieved in a minimal time in order to promote sensitivity of the probe. This thesis investigated the current touch trigger technology and found that a piezoelectric sensor may be incorporated into the shaft section. Piezoelectric material is of interest as it is widely used in sensing technology and can be manufactured into small cylindrical structures. This research has investigated the structures required for a sensor that would be applied to a touch trigger probe. An interdigitated electrode or IDE was developed and optimised with the use of computational finite element analysis (FE) and laboratory experiments. From this an understanding of the piezoelectric electromechanical behaviour with respect to the influence of the cylinder and IDE geometry on the electric field distribution and the resulting resonating characteristics was achieved. Optimised IDE electrode, cylinder geometries and piezoelectric materials allowed for the manufacture of prototype piezoelectric touch trigger probes. This was achieved by using a novel laser ablation process to manufacture IDE electrodes on the 3D piezoceramic surface. Analysis of the resonance response of the prototype piezoceramic probes showed good relation to developed FE models. Additionally, the prototype piezoceramic probes gave a good response to a mechanical contact. This thesis presents a working prototype which future work can develop it into a working CMM system. This work describes a novel approach to predict the effects of electric field on piezoelectric materials and the resulting dynamic behaviour in a multi-physics model. This was used to design, manufacture and characterise a working prototype which increases the sensitivity of a touch trigger probe.
Subjects/Keywords: 620.11; piezoelectric; resonance
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MLA ·
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Manager
APA (6th Edition):
Lewis, R. (2012). Innovation of a piezoelectric touch trigger probe. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/innovation-of-a-piezoelectric-touch-trigger-probe(381c4b36-b2ba-4c34-8fb9-251d4ee60716).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616579
Chicago Manual of Style (16th Edition):
Lewis, Rhodri. “Innovation of a piezoelectric touch trigger probe.” 2012. Doctoral Dissertation, University of Bath. Accessed February 24, 2021.
https://researchportal.bath.ac.uk/en/studentthesis/innovation-of-a-piezoelectric-touch-trigger-probe(381c4b36-b2ba-4c34-8fb9-251d4ee60716).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616579.
MLA Handbook (7th Edition):
Lewis, Rhodri. “Innovation of a piezoelectric touch trigger probe.” 2012. Web. 24 Feb 2021.
Vancouver:
Lewis R. Innovation of a piezoelectric touch trigger probe. [Internet] [Doctoral dissertation]. University of Bath; 2012. [cited 2021 Feb 24].
Available from: https://researchportal.bath.ac.uk/en/studentthesis/innovation-of-a-piezoelectric-touch-trigger-probe(381c4b36-b2ba-4c34-8fb9-251d4ee60716).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616579.
Council of Science Editors:
Lewis R. Innovation of a piezoelectric touch trigger probe. [Doctoral Dissertation]. University of Bath; 2012. Available from: https://researchportal.bath.ac.uk/en/studentthesis/innovation-of-a-piezoelectric-touch-trigger-probe(381c4b36-b2ba-4c34-8fb9-251d4ee60716).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616579
NSYSU
26.
Chen, Ting-chun.
Determination of Piezoelectric Parameters from Measured Natural Frequencies of a Piezoelectric Circular Plate.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2010, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719110-175233
► Due to the complexity of electro-elastic coupling characteristics in piezoelectric material, some of the elastic, dielectric and piezoelectric parameters are difficult to be measured. Usually,…
(more)
▼ Due to the complexity of electro-elastic coupling characteristics in
piezoelectric material, some of the elastic, dielectric and
piezoelectric parameters are difficult to be measured. Usually, these parameters are determined by assuming that all offer parameters are remained constant during the measurement. However, the interactive effect between material properties makes this assumption be not always true. In this study, the measured natural frequencies of the specified circular
piezoelectric plate are used to extract these parameters simultaneously. In other words, all these parameters are determined with considering the interactive electro-elastic coupling effect.
The analytic model of free-free circular piezoceramic plate was derived and solved to establish the relationship between natural frequencies and its material parameters, to cover most all the parameters, the out-of-plane(non-symmetric transverse) and in-plane(symmetric extensional) modes are considered. The genetic algorithm is employed to determine most all elastic, dielectric and
piezoelectric parameters from a least square error between the calculated and measured natural frequencies. Numerical results derived from the parameters proposed in this work reveal a good agreement with the measured data. In other words, the proposed method to extract the
piezoelectric parameters is feasible and effective.
Advisors/Committee Members: Jao-hwa Kuang (committee member), Shyh-chour Huang (chair), Ying-chien Tsai (chair), Der-min Tsai (chair), Yung-chuan Chen (chair).
Subjects/Keywords: piezoelectric constants; genetic algorithm; piezoelectric material; vibration; elastic constants; piezoelectric circular plate; dielectric constants
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APA (6th Edition):
Chen, T. (2010). Determination of Piezoelectric Parameters from Measured Natural Frequencies of a Piezoelectric Circular Plate. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719110-175233
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Ting-chun. “Determination of Piezoelectric Parameters from Measured Natural Frequencies of a Piezoelectric Circular Plate.” 2010. Thesis, NSYSU. Accessed February 24, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719110-175233.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Ting-chun. “Determination of Piezoelectric Parameters from Measured Natural Frequencies of a Piezoelectric Circular Plate.” 2010. Web. 24 Feb 2021.
Vancouver:
Chen T. Determination of Piezoelectric Parameters from Measured Natural Frequencies of a Piezoelectric Circular Plate. [Internet] [Thesis]. NSYSU; 2010. [cited 2021 Feb 24].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719110-175233.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen T. Determination of Piezoelectric Parameters from Measured Natural Frequencies of a Piezoelectric Circular Plate. [Thesis]. NSYSU; 2010. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719110-175233
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cornell University
27.
Reissman, Timothy.
Mesoscale Transduction Systems And Applications To Energy Harvesting Onboard Flying Insects.
Degree: PhD, Mechanical Engineering, 2013, Cornell University
URL: http://hdl.handle.net/1813/33957
► We begin this dissertation first by defining the mesoscale as the realm of feature sizes that span from the single micron to the centimeter range.…
(more)
▼ We begin this dissertation first by defining the mesoscale as the realm of feature sizes that span from the single micron to the centimeter range. The motivation for focusing on the mesoscale is that in terms of today's power applications, such geometric scale is required in order to allow for sufficient energy transduction within the larger devices that they serve. Thus, by further developing the models and fabrication techniques within the mesoscale, this collection of works aims to achieve a direct and immediate impact on advancing the state of the art within these facets of transduction technology. The first chapter of this dissertation describes the derivation and first known experimental validation of a generalized analytical method for predicting the performance of a
piezoelectric vibration energy harvesting devices with geometric discontinuities. Here we adapt the transfer matrix method to incorporate the direct
piezoelectric effect, thereby predicting the electromechanical response of such devices. The significance of this work is that it a means to progress away from geometry specific solutions to a generalized analytical approach for design. The next chapter describes the results of a fan-folded, i.e. discontinuous geometry,
piezoelectric structure attached to a Manduca sexta hawkmoth. Here the design criteria are developed through empirical studies of insect's abilities and by the power requirements of the proposed miniaturized onboard devices. The significance of this work is that it provides the first known successful demonstration of in-situ harnessing of free, flapping flight on an insect capable of powering technology such as radio transmissions. The third chapter details the use of single-level lithography to simplify the microfabrication of stacked inductors used in power converter technology. By using such a technique and increasing the scale to the mesoscale range, the inductance of such devices can be increased to the necessary micro-Henry inductance level. The fourth chapter describes the full conduction, convection, and radiation modeling of the classic thermal micro-actuator. Within this model, we extend beyond the conventional conduction-only approach to yield more accurate models and transfer functions needed for advancing controls applications in microscale technology.
Advisors/Committee Members: Garcia, Ephrahim (chair), Erickson, David (committee member), Gilmour Jr., Robert F (committee member).
Subjects/Keywords: mesoscale transduction; energy harvesting; piezoelectric
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APA (6th Edition):
Reissman, T. (2013). Mesoscale Transduction Systems And Applications To Energy Harvesting Onboard Flying Insects. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/33957
Chicago Manual of Style (16th Edition):
Reissman, Timothy. “Mesoscale Transduction Systems And Applications To Energy Harvesting Onboard Flying Insects.” 2013. Doctoral Dissertation, Cornell University. Accessed February 24, 2021.
http://hdl.handle.net/1813/33957.
MLA Handbook (7th Edition):
Reissman, Timothy. “Mesoscale Transduction Systems And Applications To Energy Harvesting Onboard Flying Insects.” 2013. Web. 24 Feb 2021.
Vancouver:
Reissman T. Mesoscale Transduction Systems And Applications To Energy Harvesting Onboard Flying Insects. [Internet] [Doctoral dissertation]. Cornell University; 2013. [cited 2021 Feb 24].
Available from: http://hdl.handle.net/1813/33957.
Council of Science Editors:
Reissman T. Mesoscale Transduction Systems And Applications To Energy Harvesting Onboard Flying Insects. [Doctoral Dissertation]. Cornell University; 2013. Available from: http://hdl.handle.net/1813/33957
Texas A&M University
28.
Dhannoon, Diyar Jamal.
Investigation on Piezoelectric and Dielectric Properties of PVDF and Poly-Amino-Di-Fluoro-Borane (PADFB).
Degree: PhD, Materials Science and Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/165830
► PVDF (polyvinylidene difluoride) is a well-known piezoelectric polymer that has nine polymorphs. This work reviews these polymorphs with respect to their thermal, mechanical and dynamical…
(more)
▼ PVDF (polyvinylidene difluoride) is a well-known
piezoelectric polymer that has nine polymorphs. This work reviews these polymorphs with respect to their thermal, mechanical and dynamical stability. Here, it is demonstrated through DFT calculations run by the VASP program that the (β) form (also known as 1p) has the highest dielectric constant, yet thermodynamically it is not the most favored form. My research on poly-amino-di-fluoro-borane (PADFB) is based on results obtained from PVDF analysis. PADFB has a structure very similar to that of PVDF. PADFB is not fully understood but is expected to have higher dielectric and
piezoelectric constants. This work showed that PADFB also has nine stable polymorphs. One of these, 2pd(y), showed to have the lowest internal energy and highest
piezoelectric property of PADFB polymorphs. PADFB has a very wide bandgap, which makes it a transparant, nonconductive
piezoelectric material with huge potential in the smart screen industry.
Advisors/Committee Members: Cagin, Tahir (advisor), Creasy, Terry (committee member), Qian, Xiaofeng (committee member), Vaddiraju, Sreeram (committee member).
Subjects/Keywords: PVDF; POSCAR; DFT; Piezoelectric; PADFB
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APA (6th Edition):
Dhannoon, D. J. (2017). Investigation on Piezoelectric and Dielectric Properties of PVDF and Poly-Amino-Di-Fluoro-Borane (PADFB). (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/165830
Chicago Manual of Style (16th Edition):
Dhannoon, Diyar Jamal. “Investigation on Piezoelectric and Dielectric Properties of PVDF and Poly-Amino-Di-Fluoro-Borane (PADFB).” 2017. Doctoral Dissertation, Texas A&M University. Accessed February 24, 2021.
http://hdl.handle.net/1969.1/165830.
MLA Handbook (7th Edition):
Dhannoon, Diyar Jamal. “Investigation on Piezoelectric and Dielectric Properties of PVDF and Poly-Amino-Di-Fluoro-Borane (PADFB).” 2017. Web. 24 Feb 2021.
Vancouver:
Dhannoon DJ. Investigation on Piezoelectric and Dielectric Properties of PVDF and Poly-Amino-Di-Fluoro-Borane (PADFB). [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Feb 24].
Available from: http://hdl.handle.net/1969.1/165830.
Council of Science Editors:
Dhannoon DJ. Investigation on Piezoelectric and Dielectric Properties of PVDF and Poly-Amino-Di-Fluoro-Borane (PADFB). [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/165830
University of Waterloo
29.
Kayaharman, Muhammed.
Design, fabrication and characterization of ferroelectret energy harvester.
Degree: 2019, University of Waterloo
URL: http://hdl.handle.net/10012/14545
► Energy harvesters gained significant interest over the last decade with the reduce in power requirements of today’s electrical devices and with the fast developments in…
(more)
▼ Energy harvesters gained significant interest over the last decade with the reduce in power requirements of today’s electrical devices and with the fast developments in low-power electronics. Limited battery life is one of the weak spots that constrains the potential of possible applications. There are only two options for remote applications when the battery is died. Either charging the battery or replacing the battery with a new one. And both of these solutions are time-consuming and expensive. On the other hand, for some of the remote applications, such as health monitoring for aircrafts, battery replacement or charging may not even be an option because of dangerous or inaccessible area conditions. In this research, a one-layer ferroelectret energy harvester is designed and fabricated. Ferroelectret energy harvester is modeled as a mass-spring-damper under harmonic base excitation. d33 piezoelectric constant of the harvester is measured with laser interferometry
method. Natural frequency of the harvester is measured experimentally with a frequency sweep up to 1 kHz. Optimum resistance of the three energy harvesters measured with impedance matching to maximize the transduction from mechanical domain into electrical domain. The effect of constant stress and stress-cycling on the stability of ferroelectret energy harvester is analyzed. According to our experiment results, constant stress significantly increased the d33 piezoelectric charge constant and the natural frequency (wn) of the harvester. Increased d33 constant also increased the the power output of the harvester under constant stress compared to stress-cycling and stress-free. Also output voltage and the capacitance value of the energy harvesters are affected by constant-stress and stresscycling. And last, mathematical model is compared with experimental results to validate the piezoelectricity of ferroelectret energy harvesters.
Subjects/Keywords: energy harvesting; piezoelectric; ferroelectret; vibration
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APA (6th Edition):
Kayaharman, M. (2019). Design, fabrication and characterization of ferroelectret energy harvester. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/14545
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kayaharman, Muhammed. “Design, fabrication and characterization of ferroelectret energy harvester.” 2019. Thesis, University of Waterloo. Accessed February 24, 2021.
http://hdl.handle.net/10012/14545.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kayaharman, Muhammed. “Design, fabrication and characterization of ferroelectret energy harvester.” 2019. Web. 24 Feb 2021.
Vancouver:
Kayaharman M. Design, fabrication and characterization of ferroelectret energy harvester. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Feb 24].
Available from: http://hdl.handle.net/10012/14545.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kayaharman M. Design, fabrication and characterization of ferroelectret energy harvester. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/14545
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
30.
Parks, David Austin.
Development of a Piezoelectric Ultrasonic Array Sensor for Nuclear Reactor Applications.
Degree: 2012, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/14020
► The recent Fukushima disaster has again demonstrated the need for improvements in nuclear power technology. The Fukushima disaster was essentially unstoppable once initiated, however the…
(more)
▼ The recent Fukushima disaster has again demonstrated the need for improvements in nuclear power technology. The Fukushima disaster was essentially unstoppable once initiated, however the research herein has the potential to help prevent such disasters. The inflection point in the course of events which lead to the numerous explosions began with the generation of hydrogen from the zirconium alloy cladding. This hydrogen is generated when the cladding temperature exceeds specified limits, in this case due to the inability to pump coolant, and occurs with all metal cladding materials (Pool, 2011).
The objective of this dissertation is the development sensors that will greatly facilitate the design of improved nuclear materials, and as such has the potential to eliminating the danger of hydrogen release from the cladding, which represents only one of many potential benefits of in-core ultrasonic sensors. In addition to utilizing the sensors in material test reactors, their use for structural health monitoring of operating nuclear power plants is very feasible.
The research herein begins with testing of new high temperature
piezoelectric materials, namely the rare earth oxyborates and bulk single crystal aluminum nitride. An extensive review of the radiation effects on
piezoelectric materials is then presented and candidate materials are selected based on the knowledge obtained therein. The most promising material, aluminum nitride, is then tested in a reactor core for three months confirming its viability. Optimization of an ultrasonic phased array composed of radiation hard materials is then performed by way of diffraction beam and finite element analyses.
Advisors/Committee Members: Bernhard R Tittmann, Dissertation Advisor/Co-Advisor, Joseph Lawrence Rose, Committee Member, Albert Eliot Segall, Committee Member, Shujun Zhang, Committee Member, Judith Todd, Committee Member.
Subjects/Keywords: ultrasonic; nuclear; piezoelectric; radiation damage
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APA (6th Edition):
Parks, D. A. (2012). Development of a Piezoelectric Ultrasonic Array Sensor for Nuclear Reactor Applications. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14020
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Parks, David Austin. “Development of a Piezoelectric Ultrasonic Array Sensor for Nuclear Reactor Applications.” 2012. Thesis, Penn State University. Accessed February 24, 2021.
https://submit-etda.libraries.psu.edu/catalog/14020.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Parks, David Austin. “Development of a Piezoelectric Ultrasonic Array Sensor for Nuclear Reactor Applications.” 2012. Web. 24 Feb 2021.
Vancouver:
Parks DA. Development of a Piezoelectric Ultrasonic Array Sensor for Nuclear Reactor Applications. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Feb 24].
Available from: https://submit-etda.libraries.psu.edu/catalog/14020.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Parks DA. Development of a Piezoelectric Ultrasonic Array Sensor for Nuclear Reactor Applications. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/14020
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations
