+publisher:"Penn State University" +contributor:("Christopher Rahn, Committee Chair/Co-Chair")

You searched for +publisher:"Penn State University" +contributor:("Christopher Rahn, Committee Chair/Co-Chair"). Showing records 1 – 14 of 14 total matches.

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Penn State University

1. Zhu, Bin. Modeling, Design, and Experimental Testing of Integrated Fluidic Flexible Matrix Composite Structures.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/22091

► Fluidic Flexible Matrix Composites (F2MCs) consist of a highly anisotropic FMC laminate that encloses a working fluid. The FMC laminate is basically a composite shell… (more)

▼ Fluidic Flexible Matrix Composites (F2MCs) consist of a highly anisotropic FMC laminate that encloses a working fluid. The FMC laminate is basically a composite shell that has reinforcements orientated at a particular angle with respect to the longitudinal axis. F2MC tubes have been shown to provide actuation, stiffness change, and vibration reduction in applications that require isolated tubes or multiple tubes embedded in a soft matrix. Structural applications, however, often require stiff and strong materials. The objective of this research is to integrate relatively soft F2MC tubes into rigid host structures, by either embedding or bonding, such that the F2MC integrated structures can have tunable shape, stiffness, fluid pumping, vibration damping, or vibration absorption characteristics. First, we explore the functionality of F2MC tubes embedded into a stiff matrix. The geometry and anisotropy of the tube can be tailored for either highly leveraged fluid pumping under mechanical deformation or highly leveraged stiffness change by preventing fluid flow into or out of the tube. A bilayer analytical model is developed using Lekhnitskii’s solution for an anisotropic tube under axial and pressure loading. The analysis shows a confining effect of the surrounding rigid matrix on the performance of F2MC tubes. With tailoring of the tube wall thickness (thick) and wind angle (near-axial), however, F2MC tubes can pump 250 times more fluid than a piston of the same diameter. Furthermore, axial stiffness can be increased by a factor of 2.2 when fluid flow is prevented. Secondly, the actuation performance of F2MC tubes embedded in structural media is investigated. The unit cell models examined are cylindrical and bi-layer with the inner layer being a thick walled F2MC tube and the outer layer representing the surrounding rigid composite and composed of either homogeneous epoxy or a second FMC layer made with stiffer matrix material. The analytical models are validated using ABAQUS. The analytical results show that actuation performance is generally reduced compared to that of an isolated F2MC tube due to the radial and longitudinal constraints. Free strain is generally two orders of magnitude smaller for an F2MC tube in structural media, requiring higher actuation pressures for bi-layer F2MC structures. The blocking force of F2MC in either epoxy or composite is roughly an order of magnitude smaller than that of an isolated F2MC tube. Thirdly, we propose damping the vibration of a cantilever beam by bonding multiple F2MC tubes to the beam and using the strain induced fluid pumping to dissipate energy. Transverse beam vibration strains the F2MC tube and generates fluid flow through an energy dissipating orifice. An optimally sized orifice maximizes energy dissipation, greatly reducing the resonant peaks and increasing modal damping. An analytical model is developed based on Euler-Bernoulli beam theory and Lekhnitskii’s solution for anisotropic layered tubes. Using miniature tubes, a laboratory-scale F2MC-integrated beam… Advisors/Committee Members: Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Chair%22%29&pagesize-30">Charles E Bakis, Committee Chair/Co-Chair, Martin Wesley Trethewey, Committee Member, Alok Sinha, Committee Member, George A Lesieutre, Special Member.

Subjects/Keywords: Vibration Control; Fluidic Flexible Matrix Composite; Passive Vibration Suppression; Harmonic Resonance; Damping Treatment

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APA (6^th Edition):

Zhu, B. (2014). Modeling, Design, and Experimental Testing of Integrated Fluidic Flexible Matrix Composite Structures. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22091

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhu, Bin. “Modeling, Design, and Experimental Testing of Integrated Fluidic Flexible Matrix Composite Structures.” 2014. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/22091.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhu, Bin. “Modeling, Design, and Experimental Testing of Integrated Fluidic Flexible Matrix Composite Structures.” 2014. Web. 04 Mar 2021.

Vancouver:

Zhu B. Modeling, Design, and Experimental Testing of Integrated Fluidic Flexible Matrix Composite Structures. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/22091.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhu B. Modeling, Design, and Experimental Testing of Integrated Fluidic Flexible Matrix Composite Structures. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22091

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

2. Treacy, Shawn Michael. STABILITY ANALYSIS AND EXPERIMENTAL TESTING OF FLUIDIC PITCH LINKS IN HELICOPTERS WITH ARTICULATED ROTORS.

Degree: 2017, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/14572smt249

► Vibration levels in helicopters impact many aspects of flight including performance, comfort, and reliability. Three types of vibration control exist to dissipate these effects: passive… (more)

▼ Vibration levels in helicopters impact many aspects of flight including performance, comfort, and reliability. Three types of vibration control exist to dissipate these effects: passive control, semi-active control, and active control. Historically, rigid pitch links have been used on rotorcraft, however, researchers have been exploring alternatives to conventional rigid pitch links as a means to reduce vibrations. One viable passive vibration reduction device is the fluidic pitch link. Replacing rigid pitch links on rotorcraft with fluidic pitch links provides a method for vibratory control. At high frequencies, the pitch link impedance can be tuned to change the blade pitching response to higher harmonic loads. Although all have not been demonstrated simultaneously, fluidic pitch links have been shown to reduce rotor power and all six hub forces and moments. While reduced vibrations have been observed upon substitution of rigid pitch links for fluidic pitch links, the impact of fluidic pitch links on stability has not yet been examined. As such, this investigation explores the aeroelastic stability of a helicopter with fluidic pitch links. Each rotor is articulated and is modeled by rigid pitch and rigid flap degrees of freedom. Quasi-steady aerodynamics are used for the lift and moment terms in the aeroelastic model. The control system stiffness is modeled as an axial spring. The fluidic pitch links have two degrees of freedom: axial displacement of the piston, which is directly related to pitch, and volume of fluid entering the inertia track. A positive impact on aeroelastic stability from several fluidic pitch link designs is demonstrated for hover. The positive stability margins found for the fluidic pitch links in hover are marginally affected by the periodic terms that appear in forward flight. The fluidic pitch links are shown to help stabilize the pitch mode and enable use of substantially larger aft center of gravity offsets in rotor design. To test the fluidic pitch link for model verification purposes, the model for a double pumper fluidic pitch link was derived. This is a more viable and popular choice than the single pumper design used previously due to greater safety and reduced risk of cavitation. A prototype fluidic pitch link was designed, built, and tested at LORD Corporation. Displacement, load, and pressure were recorded during testing. Frequency and time response results were compared between simulation and experiment to validate the model. Three different fluid circuits were used, and the model accurately predicted performance for each of them with the exception of inaccuracy at low frequency due, in part, to the frequency dependence of the elastomer. An additional fourth circuit was tested that included a needle valve. The model did not accurately predict results across the entire range of valve positions, but the model was able to accurately match the dynamic stiffness amplitude using empirical parameters from a parameter study. Advisors/Committee Members: Christopher Rahn, Dissertation Advisor/Co-Advisor, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Edward Smith, Committee Member, Reuben H Kraft, Committee Member, Joseph Paul Cusumano, Outside Member.

Subjects/Keywords: fluidic pitch link; FPL; stability; articulated; helicopter; experiment; test; rotor

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APA (6^th Edition):

Treacy, S. M. (2017). STABILITY ANALYSIS AND EXPERIMENTAL TESTING OF FLUIDIC PITCH LINKS IN HELICOPTERS WITH ARTICULATED ROTORS. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14572smt249

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Treacy, Shawn Michael. “STABILITY ANALYSIS AND EXPERIMENTAL TESTING OF FLUIDIC PITCH LINKS IN HELICOPTERS WITH ARTICULATED ROTORS.” 2017. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/14572smt249.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Treacy, Shawn Michael. “STABILITY ANALYSIS AND EXPERIMENTAL TESTING OF FLUIDIC PITCH LINKS IN HELICOPTERS WITH ARTICULATED ROTORS.” 2017. Web. 04 Mar 2021.

Vancouver:

Treacy SM. STABILITY ANALYSIS AND EXPERIMENTAL TESTING OF FLUIDIC PITCH LINKS IN HELICOPTERS WITH ARTICULATED ROTORS. [Internet] [Thesis]. Penn State University; 2017. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/14572smt249.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Treacy SM. STABILITY ANALYSIS AND EXPERIMENTAL TESTING OF FLUIDIC PITCH LINKS IN HELICOPTERS WITH ARTICULATED ROTORS. [Thesis]. Penn State University; 2017. Available from: https://submit-etda.libraries.psu.edu/catalog/14572smt249

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

3. Hill, Jeffrey Ray. High Precision Surface Control of Flexible Space Reflectors.

Degree: 2011, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/11748

► Flexible reflectors are used for a number of applications in space, including resource monitoring, weather analysis, hazard assessment, reconnaissance, and imaging. With the rapid advances… (more)

▼ Flexible reflectors are used for a number of applications in space, including resource monitoring, weather analysis, hazard assessment, reconnaissance, and imaging. With the rapid advances in deployable membrane and mesh antenna technologies, the feasibility of developing large, lightweight reflectors has greatly improved, though high-precision surface control is needed in order to achieve the required surface accuracy. The purpose of this research is to advance the state of the art by implementing high-precision surface control on a flexible reflector using PVDF actuators, as well as introducing methods to overcome real world problems that can develop when implementing this technology. A reflector/actuator system is modeled such that the model can be quickly modified in order to accommodate different actuator locations. Experimental results show that while the analytical reflector model is generally correct, due to idiosyncrasies in the reflector it should not be used for online control. Therefore, a methodology is proposed for online system identification for use with an online control law. Using the PVDF actuators, surface control is executed using a least squares control law, where photogrammetry is used to determine the out-of-plane displacement at designated points on the surface. When the surface cannot be fully covered with actuators, optimal placement of the available actuators must be considered. First, when focusing solely on the constraint on the number of possible actuators, optimal placement of the actuators is found using a genetic algorithm. A constraint on how many independent power supplies are available is added. A new method to determine the optimal grouping of actuators to power supplies is derived, called the En Masse Elimination (EME) method. This method can determine the global optimal solution without having to exhaustively search every possible grouping combination. A number of improvements to the EME method are given which increase the speed of the algorithm as well as enable the EME algorithm to be used online during dynamically changing error conditions. Finally, the EME method is experimentally validated using a single pinned-pinned beam. Using a beam rather than a reflector reduces the complexity of the problem while still showing the functionality of the EME algorithm. Experimental data show that the EME algorithm is able to quickly and accurately find the global optimal actuator grouping. Advisors/Committee Members: Dr Kon Well Wang, Dissertation Advisor/Co-Advisor, Chair%22%29&pagesize-30">Dr Kon Well Wang, Committee Chair/Co-Chair, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, George A Lesieutre, Committee Member, Mary I Frecker, Committee Member.

Subjects/Keywords: Gossamer; control; En Masse Elimination; modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hill, J. R. (2011). High Precision Surface Control of Flexible Space Reflectors. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/11748

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hill, Jeffrey Ray. “High Precision Surface Control of Flexible Space Reflectors.” 2011. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/11748.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hill, Jeffrey Ray. “High Precision Surface Control of Flexible Space Reflectors.” 2011. Web. 04 Mar 2021.

Vancouver:

Hill JR. High Precision Surface Control of Flexible Space Reflectors. [Internet] [Thesis]. Penn State University; 2011. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/11748.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hill JR. High Precision Surface Control of Flexible Space Reflectors. [Thesis]. Penn State University; 2011. Available from: https://submit-etda.libraries.psu.edu/catalog/11748

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

4. Tanim, Tanvir Reza. Lithium Ion Battery Modeling, Estimation, and Aging for Hybrid Electric Vehicle Applications.

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/27081

► Reducing greenhouse gas emissions and improving the fuel efficiency of automobiles, trucks, and buses can be achieved by partial and full electrification of the vehicle… (more)

▼ Reducing greenhouse gas emissions and improving the fuel efficiency of automobiles, trucks, and buses can be achieved by partial and full electrification of the vehicle sector. Lithium ion battery technology is the leading candidate for vehicle electrification. Despite many advantages of lithium ion battery technology, over-conservative pack design due to a lack of advanced battery management hinders its widespread deployment in the transportation sector. This dissertation introduces a model-based approach for safe and efficient advanced lithium ion battery management. Low order, explicit models of lithium ion cells are critical for real-time battery management system (BMS) applications. Li-ion cell response varies significantly with temperature and cell temperature measurements are often available. This study presents a 7th order, single particle model with electrolyte diffusion and temperature dependent parameters (ESPM-T model). The impedance transfer function coefficients are explicit in terms of the model parameters, simplifying the implementation of temperature dependence yet providing an accurate model. The 7th order, linear, electrolyte enhanced, single particle model (ESPM) is used as the basis for a Luenberger SOC observer for a lithium ion cell. Isothermal and non-isothermal observer performances are compared with a commercially-available finite volume code and the benefits of temperature measurement are shown for a wide range of temperature and pulse C-rates. The ESPM is then extended to a nonlinear, electrolyte-enhanced, single particle model (NESPM), which includes nonlinearities associated with open circuit voltage and Butler-Volmer (B-V) kinetics. The model is validated with experimental full charge, discharge, and HEV cycles from 4.5 Ah high power and 20 Ah high energy graphite (gr)/LiFePO4 (LFP) cells. The NESPM is capable of operating up to 3C constant charge-discharge cycles and up to 25C and 10 sec charge-discharge pulses within 35-65% state of charge (SOC) with less than 2% error for the 4.5 Ah high power cell. For the 20 Ah high energy cell, the NESPM model is capable of operating up to 2C constant charge-discharge cycles and up to 10C and 10 sec charge-discharge pulses within 30-90% SOC window with 3.7% maximum error. An aging model due to solid electrolyte interphase layer growth is added to the NESPM model. The NESPM aging model is then simplified to obtain explicit formulas for capacity fade and impedance rise that depend on the battery parameters and current input history. These simple aging models can be implemented in online model based battery SOH estimation. The formulas show that aging increases with SOC, operating temperature, time, and root mean square (RMS) current. The formula predicts that HEV current profiles with the (i) same average SOC, (ii) small SOC swing, (iii) same operating temperature, (iv) same cycle length, and (v) same RMS current, will have the same cell capacity fade. The single cell ESPM-T model is extended to a pack model with three cells in parallel to… Advisors/Committee Members: Christopher Rahn, Dissertation Advisor/Co-Advisor, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Chao Yang Wang, Committee Member, Hosam Kadry Fathy, Committee Member, Srinivas A Tadigadapa, Committee Member.

Subjects/Keywords: Lithium Battery Modeling; Battery Management System; Battery State Estimation; Hybrid Electric Vehicles

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tanim, T. R. (2015). Lithium Ion Battery Modeling, Estimation, and Aging for Hybrid Electric Vehicle Applications. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/27081

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tanim, Tanvir Reza. “Lithium Ion Battery Modeling, Estimation, and Aging for Hybrid Electric Vehicle Applications.” 2015. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/27081.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tanim, Tanvir Reza. “Lithium Ion Battery Modeling, Estimation, and Aging for Hybrid Electric Vehicle Applications.” 2015. Web. 04 Mar 2021.

Vancouver:

Tanim TR. Lithium Ion Battery Modeling, Estimation, and Aging for Hybrid Electric Vehicle Applications. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/27081.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tanim TR. Lithium Ion Battery Modeling, Estimation, and Aging for Hybrid Electric Vehicle Applications. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/27081

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

5. Shi, Ying. modeling, real-time degradation identification, and remediation of lead-acid battries.

Degree: 2013, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/19719

► Valve Regulated Lead-Acid (VRLA) batteries are cheap and mature technology, favorable candidates for micro-hybrid vehicles and stationary applications. Large-scale battery packs, instead of individual cells,… (more)

▼ Valve Regulated Lead-Acid (VRLA) batteries are cheap and mature technology, favorable candidates for micro-hybrid vehicles and stationary applications. Large-scale battery packs, instead of individual cells, are implemented in those applications; therefore sophisticated battery management system (BMS) becomes necessary and crucial to ensure the longevity and efficient utilization of battery packs. Such a BMS must have several key elements: a simple but accurate system model that captures battery performance and aging processes, sensor measurements that gather information to help the controller monitor battery health and identify major aging mechanisms, and an advanced controller that estimates state of charge (SOC) and state of health (SOH) of cells and optimizes their usage accordingly. This research first reviews six modeling techniques that are suitable for developing electrochemistry-based system models of batteries. Fundamental battery models, consisting of nonlinear coupled partial differential equations, are often difficult to discretize and reduce in order so that they can be used by systems engineers for design, estimation, prediction, and management. In this work, six methods are used to discretize a benchmark electrolyte diffusion problem and their time and frequency response accuracy is determined as a function of discretization order. The Analytical Method (AM), Integral Method Approximation (IMA), Pade Approximation Method (PAM), Finite Element Method (FEM), Finite Difference Method (FDM) and Ritz Method (RM) are formulated for the benchmark problem and convergence speed and accuracy calculated. The PAM is the most efficient, producing 99.5% accurate results with only a 3rd order approximation. IMA, Ritz, AM, FEM, and FDM required 4, 6, 9, 14, and 27th order approximations, respectively, to achieve the same error. If both modeling complexity and efficiency are considered, Ritz method is the best candidate. Secondly, this research presents a nondestructive experiment method to perform real-time aging diagnosis of lead-acid batteries. VTLA batteries can degrade due to a variety of mechanisms, including corrosion, hard sulfation, water loss, shedding, and active mass degradation. VRLA batteries are designed to minimize these effects as much as possible but the operating environment, cell-to-cell and battery-to-battery manufacturing variations, and use can cause different degradation mechanisms to dominate capacity loss and/or impedance rise. With accurate State of Health monitoring, cell usage can be adjusted by the battery management system (BMS) to optimize the performance and life of the energy storage system. The BMS must be able to determine in real time the predominant degradation mechanism for each cell and adjust use accordingly. In this work, new and dead VRLA batteries are tested with constant, sinusoidal, and pulse charge/discharge current inputs while measuring the cell voltage and pressure to determine the cause of death of the cells. As expected, the new cells have fairly uniform… Advisors/Committee Members: Christopher Rahn, Dissertation Advisor/Co-Advisor, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Chao Yang Wang, Committee Member, Hosam Kadry Fathy, Committee Member, Jeffrey Scott Mayer, Committee Member.

Subjects/Keywords: modeling; battery system management; degradation diagnosis; desulfation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shi, Y. (2013). modeling, real-time degradation identification, and remediation of lead-acid battries. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/19719

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shi, Ying. “modeling, real-time degradation identification, and remediation of lead-acid battries.” 2013. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/19719.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shi, Ying. “modeling, real-time degradation identification, and remediation of lead-acid battries.” 2013. Web. 04 Mar 2021.

Vancouver:

Shi Y. modeling, real-time degradation identification, and remediation of lead-acid battries. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/19719.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shi Y. modeling, real-time degradation identification, and remediation of lead-acid battries. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/19719

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

6. Scarborough, Lloyd Harmon. Dynamics of Fluidic Devices with Applications to Rotor Pitch Links.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/20438

► Coupling a Fluidic Flexible Matrix Composite (F2MC) to an air-pressurized fluid port produces a fundamentally new class of tunable vibration isolator. This fluidlastic device provides… (more)

▼ Coupling a Fluidic Flexible Matrix Composite (F2MC) to an air-pressurized fluid port produces a fundamentally new class of tunable vibration isolator. This fluidlastic device provides significant vibration reduction at an isolation frequency that can be tuned over a broad frequency range. The material properties and geometry of the F2MC element, as well as the port inertance, determine the isolation frequency. A unique feature of this device is that the port inertance depends on pressure so the isolation frequency can be adjusted by changing the air pressure. For constant port inertance, the isolation frequency is largely independent of the isolated mass so the device is robust to changes in load. A nonlinear model is developed to predict isolator length and port inertance. The model is linearized and the frequency response calculated. Experiments agree with theory, demonstrating a tunable isolation range from 9 Hz to 36 Hz and transmitted force reductions of up to 60 dB at the isolation frequency. Replacing rigid pitch links on rotorcraft with coupled fluidic devices has the potential to reduce the aerodynamic blade loads transmitted through the pitch links to the swashplate. Analytical models of two fluidic devices coupled with three different fluidic circuits are derived. These passive fluidlastic systems are tuned, by varying the fluid inertances and capacitances of each fluidic circuit, to reduce the transmitted pitch-link loads. The different circuit designs result in transmitted pitch link loads reduction at up to three main rotor harmonics. The simulation results show loads reduction at the targeted out-of-phase and in-phase harmonics of up to 88% and 93%, respectively. Experimental validation of two of the fluidic circuits demonstrates loads reduction of up to 89% at the out-of-phase isolation frequencies and up to 81% at the in-phase isolation frequencies. Replacing rigid pitch links on rotorcraft with fluidic pitch links changes the blade torsional impedance. At low frequency, the pitch link must have high impedance to pass through the pilot’s collective and cyclic commands to control the aircraft. At higher frequencies, however, the pitch-link impedance can be tuned to change the blade pitching response to higher harmonic loads. Active blade control to produce higher harmonic pitch motions has been shown to reduce hub loads and increase rotor efficiency. This work investigates whether fluidic pitch links can passively provide these benefits. An analytical model of a fluidic pitch link is derived and incorporated into a rotor aeroelastic simulation for a rotor similar to that of the UH-60. Eighty-one simulations with varied fluidic pitch link parameters demonstrate that their impedance can be tailored to reduce rotor power and all six hub forces and moments. While no impedance was found that simultaneously reduced all components, the results include cases with reductions in the lateral 4/rev hub force of up to 91% and 4/rev hub pitching moment of up to 67%, and main rotor power of up to… Advisors/Committee Members: Christopher Rahn, Dissertation Advisor/Co-Advisor, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Edward C Smith, Committee Member, Kevin L Koudela, Committee Member, Martin Wesley Trethewey, Committee Member.

Subjects/Keywords: vibration isolation; pitch link loads; fluidic pitch link; rotorcraft vibration; helicopter vibration; rotorcraft performance

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Scarborough, L. H. (2014). Dynamics of Fluidic Devices with Applications to Rotor Pitch Links. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/20438

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Scarborough, Lloyd Harmon. “Dynamics of Fluidic Devices with Applications to Rotor Pitch Links.” 2014. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/20438.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Scarborough, Lloyd Harmon. “Dynamics of Fluidic Devices with Applications to Rotor Pitch Links.” 2014. Web. 04 Mar 2021.

Vancouver:

Scarborough LH. Dynamics of Fluidic Devices with Applications to Rotor Pitch Links. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/20438.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Scarborough LH. Dynamics of Fluidic Devices with Applications to Rotor Pitch Links. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/20438

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

7. Krott, Matthew Joseph. Fluidic Flexible Matrix Composite Vibration Treatments for Helicopter Airframes and Rotor Blades.

Degree: 2018, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/15865mjk5358

► Vibrations caused by periodic and unsteady loading in rotorcraft must be minimized to maintain acceptable fatigue life in structural parts and ride quality for passengers… (more)

▼ Vibrations caused by periodic and unsteady loading in rotorcraft must be minimized to maintain acceptable fatigue life in structural parts and ride quality for passengers and crew. Rotorcraft vibrations are typically addressed through some combination of passive and active solutions that focus on reducing steady-state vibrations at the n/rev frequency, where n is the number of rotor blades. Currently existing passive treatments are often heavy, bulky variations of the classical tuned vibration absorber. Active treatments either attempt to isolate the cabin from hub vibratory loads or reduce cabin vibrations using a set of actuators, but they are more difficult to implement because they require a power supply and controller. This research covers the modeling, design, and experimental verification of fluidic flexible matrix composite (F2MC) vibration treatments for two main rotorcraft applications: airframe vibration control and rotor blade damping. The main advantages to using F2MC tubes over conventional hydraulic devices with pistons are their high strain-induced pumping capability and high force output per unit pressure. A laboratory-scale rotorcraft tailboom was used as a testbed for demonstrating new F2MC vibration absorber concepts. The tailboom is modeled using Euler-Bernoulli beam finite elements and coupled to a model of the F2MC tubes and fluidic circuit. Based on the combined structural and fluid system model, an F2MC damped vibration absorber was designed and built using four F2MC tubes placed near the corners of the rectangular tailboom. Experimental results showed reduction of both lateral and torsional vibrations in a 26.7 Hz coupled tailboom vibration mode by up to 80%. Three fluidic circuits were tested for performance and model verification. This single-mode F2MC vibration absorber was then modified so that two tailboom vibration modes can be treated by the same device. A lateral absorber frequency was tuned by selecting lengths of short branch segments connecting the left and right F2MC tube pairs. Then, a vertical absorber frequency was tuned by selecting the appropriate length of tubing to connect the top and bottom F2MC tube pairs. The tuned multi-mode vibration absorber reduced vibration by 63% in the vertical mode and 65% in the lateral mode, whereas a comparable absorber designed to only treat the vertical mode reduced vibration by 68% in the vertical mode but only 42% in the lateral mode. The weight penalty from modifying the circuit to treat both modes was only 2% of the original absorber weight. New F2MC devices are proposed to augment the damping of both articulated and hingeless rotor blades. The proposed device for articulated blades dissipates energy by using an F2MC tube to pump fluid through an orifice. In contrast, the proposed device for hingeless blades uses an F2MC tube as part of a damped vibration absorber with a tuned inertia track. Models are derived for both conceptsto assess the feasibility of these dampers for representative articulated, stiff-inplane, and soft-inplane… Advisors/Committee Members: Christopher Rahn, Dissertation Advisor/Co-Advisor, Chair%22%29&pagesize-30">Edward Smith, Committee Chair/Co-Chair, Bo Cheng, Committee Member, Jose Palacios, Committee Member, Charles E Bakis, Outside Member, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Edward C. Smith, Dissertation Advisor/Co-Advisor.

Subjects/Keywords: F2MC; fluidic flexible matrix composite; helicopter; rotorcraft; structural dynamics; vibration absorber; damper; rotor blade; vibration control

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APA (6^th Edition):

Krott, M. J. (2018). Fluidic Flexible Matrix Composite Vibration Treatments for Helicopter Airframes and Rotor Blades. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/15865mjk5358

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Krott, Matthew Joseph. “Fluidic Flexible Matrix Composite Vibration Treatments for Helicopter Airframes and Rotor Blades.” 2018. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/15865mjk5358.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Krott, Matthew Joseph. “Fluidic Flexible Matrix Composite Vibration Treatments for Helicopter Airframes and Rotor Blades.” 2018. Web. 04 Mar 2021.

Vancouver:

Krott MJ. Fluidic Flexible Matrix Composite Vibration Treatments for Helicopter Airframes and Rotor Blades. [Internet] [Thesis]. Penn State University; 2018. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/15865mjk5358.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Krott MJ. Fluidic Flexible Matrix Composite Vibration Treatments for Helicopter Airframes and Rotor Blades. [Thesis]. Penn State University; 2018. Available from: https://submit-etda.libraries.psu.edu/catalog/15865mjk5358

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

8. Zhao, Haiyu. Passive, Iterative, and Repetitive Control for Flexible Distributed Parameter Systems.

Degree: 2008, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/6805

► Many engineering structures have distributed parameter models governed by partial differential equations. Without damping, distributed flexible structures are not stable due to the infinite number… (more)

▼ Many engineering structures have distributed parameter models governed by partial differential equations. Without damping, distributed flexible structures are not stable due to the infinite number of resonances at natural frequencies. Bounded sinusoidal inputs at these frequencies can cause unbounded response. This thesis shows that Passive Control, Iterative Learning Control (ILC), and Repetitive Learning Control (RLC) can be designed to reduce tracking or regulation errors in response to bounded, periodic inputs. Distributed flexible strings, beams, membranes, plates, axially moving materials, electrostatic microbridges, and flexible whisker contact imagers are studied. Passive control using distributed or boundary damping is proven to stabilize the response of strings, beams, membranes, and plates. Damping ensures bounded response to bounded distributed and boundary inputs. Distributed viscous or Kelvin-Voigt material damping can guarantee pointwise or strong boundedness for strings and beams and weak boundedness for membranes and plates. Translational damping on one boundary stabilizes strings and beams. Damping on part of the boundary can also weakly stabilize the forced response of membranes and plates, provided the damped and undamped boundary normals satisfy certain conditions. For example, damping on half and one side of the boundary is sufficient for circular and rectangular domains, respectively. Iterative Learning Control provides precise tension and speed control of axially moving material systems to enable high speed processing of paper, plastics, fibers, and films. PD tension/speed control is proven to ensure strong and weak boundedness of distributed displacement and tension, respectively, in a single span axially moving material system. ILC provides the same theoretical result with half the speed error and 30% of the tension error of PD control using the same control effort. Repetitive Learning Control is applied to an electrostatic microbridge and a repetitive contact imager. Electrostatic microactuators are used extensively in MEMS sensors, RF switches, and microfluidic pumps. Due to high bandwidth operation, however, reduction of residual vibration using feedback control is difficult to implement. Feedforward RLC is designed, proven stable, and simulated for an electrostatic microbridge under a periodic desired spatial/time trajectory. High residual stresses in the microbridge mean that bending stiffness can be neglected and a pinned string model with uniform loading is appropriate. Squeeze film damping ensures boundedness of the distributed transverse displacement. Offline RLC processing of the average displacement as measured by capacitive sensing updates a waveform generator's parameters. Simulations show a 36% reduction in midspan overshoot under repetitive control. Repetitive contact imaging uses a flexible whisker attached to a two axis robot through a load cell. Assuming small deformations and rotations, the pitch axis decouples from yaw. The yaw axis, under PD control, sweeps… Advisors/Committee Members: Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Kon Well Wang, Committee Member, Qian Wang, Committee Member, Farhan Gandhi, Committee Member.

Subjects/Keywords: Feedforward control; flexible distributed parameter systems; vibration control; BIBO stability

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhao, H. (2008). Passive, Iterative, and Repetitive Control for Flexible Distributed Parameter Systems. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/6805

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhao, Haiyu. “Passive, Iterative, and Repetitive Control for Flexible Distributed Parameter Systems.” 2008. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/6805.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhao, Haiyu. “Passive, Iterative, and Repetitive Control for Flexible Distributed Parameter Systems.” 2008. Web. 04 Mar 2021.

Vancouver:

Zhao H. Passive, Iterative, and Repetitive Control for Flexible Distributed Parameter Systems. [Internet] [Thesis]. Penn State University; 2008. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/6805.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhao H. Passive, Iterative, and Repetitive Control for Flexible Distributed Parameter Systems. [Thesis]. Penn State University; 2008. Available from: https://submit-etda.libraries.psu.edu/catalog/6805

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

9. Lotfi Gaskarimahalle, Amir. VIBRATION CONTROL OF DISTRIBUTED PARAMETER SYSTEMS AND FLUIDIC FLEXIBLE MATRIX COMPOSITES .

Degree: 2009, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/10098

► Vibration degrades the performance of many mechanical systems, reducing the quality of manufactured products, producing noise, introducing fatigue in mechanical compo- nents, and generating an… (more)

▼ Vibration degrades the performance of many mechanical systems, reducing the quality of manufactured products, producing noise, introducing fatigue in mechanical compo- nents, and generating an uncomfortable environment for passengers. Vibration control is categorized as: active, passive, semi-active or hybrid, based on the power consumption of the control system and feedback or feedforward based on whether sensing is used to control vibration. In this thesis, we study input shaping control of Distributed Parame- ter Systems (DPS) and passive and semi-active vibration control using Fluidic Flexible Matrix Composites (F2MC). First, we extend input shaping control to one dimensional continua. Unlike discrete systems where the input is shaped only in the temporal domain, temporal and spatial input shaping can produce zero residual vibration in setpoint position control of distrib- uted strings and beams. For collocated and noncollocated boundary control of strings and domain control of strings and pinned beams, the response to step inputs is solved in closed form using delays. For a clamped beam model, a closed form in…nite modal series is used. The boundary controlled string can be setpoint regulated using two-pulse Zero Vibration (ZV) and three-pulse Zero Vibration and Derivative (ZVD) shapers but ZVD is not more robust to parameter variations than ZV, a unique characteristic of second-order PDE systems. Noncollocated ZV and ZVD boundary control enables rigid body translation of a string with zero residual vibration. Domain controlled strings and pinned beams with spatial input distributions that satisfy certain orthogonality condi- tions (e.g. midspan point load or uniformly distributed load) can be setpoint regulated with shaped inputs. For the cantilevered beam, modal shaping of the input distribution and ZV or ZVD temporal shaping drives the tip to the desired position with zero residual vibration. A command shaping approach in vibration control using F2MC tubes as variable sti¤ness structures is studied in the third chapter. The apparent sti¤ness of F2MC tubes can be changed using a variable ori…ce valve. With …ber reinforcement, the volume inside the tube may change with external load. With an open valve, the liquid is free to move in or out of the tube, so the apparent sti¤ness does not change. When the valve is closed, the high bulk modulus liquid is con…ned, which resists the volume change and causes the apparent sti¤ness of the tube to increase. The equations of motion of an F2MC-mass system is derived using a 3-D elasticity model and the energy method. A reduced order model is then developed for fully-open and fully-closed valves. A Skyhook control that cycles the valve between open and closed, asymptotically decays the vibration. A Zero Vibration (ZV) Sti¤ness Shaping technique is introduced to suppress the vibration in …nite time. A sensitivity analysis of the ZV Sti¤ness Shaper studies the robustness to parametric uncertainties. We also investigate passive and semi-active vibration control using F2MC… Advisors/Committee Members: Christopher Rahn, Dissertation Advisor/Co-Advisor, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Alok Sinha, Committee Member, Qian Wang, Committee Member, George A Lesieutre, Committee Member.

Subjects/Keywords: Semi-active Control; Tuned Vibration Absorbers; Variable Stiffness Systems; Input Shaping; Vibration Control

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lotfi Gaskarimahalle, A. (2009). VIBRATION CONTROL OF DISTRIBUTED PARAMETER SYSTEMS AND FLUIDIC FLEXIBLE MATRIX COMPOSITES . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/10098

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lotfi Gaskarimahalle, Amir. “VIBRATION CONTROL OF DISTRIBUTED PARAMETER SYSTEMS AND FLUIDIC FLEXIBLE MATRIX COMPOSITES .” 2009. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/10098.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lotfi Gaskarimahalle, Amir. “VIBRATION CONTROL OF DISTRIBUTED PARAMETER SYSTEMS AND FLUIDIC FLEXIBLE MATRIX COMPOSITES .” 2009. Web. 04 Mar 2021.

Vancouver:

Lotfi Gaskarimahalle A. VIBRATION CONTROL OF DISTRIBUTED PARAMETER SYSTEMS AND FLUIDIC FLEXIBLE MATRIX COMPOSITES . [Internet] [Thesis]. Penn State University; 2009. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/10098.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lotfi Gaskarimahalle A. VIBRATION CONTROL OF DISTRIBUTED PARAMETER SYSTEMS AND FLUIDIC FLEXIBLE MATRIX COMPOSITES . [Thesis]. Penn State University; 2009. Available from: https://submit-etda.libraries.psu.edu/catalog/10098

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

10. Smith, Kandler A. Electrochemical Modeling, Estimation and Control of Lithium Ion Batteries.

Degree: 2008, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/7376

► Batteries directly contribute to the advancement of technologies ranging from portable electronics to fuel-efficient vehicles. In high power applications such as hybrid electric vehicles (HEVs),… (more)

▼ Batteries directly contribute to the advancement of technologies ranging from portable electronics to fuel-efficient vehicles. In high power applications such as hybrid electric vehicles (HEVs), monitoring algorithms use current and voltage measurements to estimate battery state of charge (SOC) and available power. Despite increased cost, these systems commonly employ conservative, oversized batteries due to poor prediction of current/voltage dynamics and imprecise real-time estimation. This dissertation introduces a general, electrochemical model-based approach for safe and efficient integration of Li-ion batteries into transient, pulse power-type systems. A transient solid-state diffusion model is incorporated into a previously developed 1D electrochemical model. The nonlinear model, solving 4 coupled partial differential equations by a computational fluid dynamics (CFD) technique, is validated against low rate constant current, pulse power, and transient driving cycle data sets from a 6 Ah Li-ion HEV battery. Solid-state Li transport (diffusion) significantly limits high rate performance, and end of discharge at the 2.7 V minimum limit is caused by depleted/saturated active material surface concentrations in the negative/positive electrodes for pulses lasting longer than around 10 seconds. The 3.9 V maximum limit, meant to protect the negative electrode from side reactions such as lithium plating, is overly conservative for pulse charging. Increased power capability may be realized by using a real-time electrochemical model to estimate internal states and control the battery within appropriate limits. Development of a fast, stable, and accurate model is difficult however, given the infinite-dimensional, distributed nonlinear processes governing battery dynamics. Here, an impedance model is derived from the electrochemical kinetic, species and charge transport equations and, using a model order reduction technique developed herein, the high order transfer functions/matrices are numerically reduced to an observable/controllable state variable model in modal form. Open circuit potential and electrode surface concentration nonlinearities are explicitly approximated in the model output equation on a local and electrode-averaged basis, respectively. Validated against the 313th order CFD model, a 12th order state variable model with 0-10 Hz bandwidth predicts terminal voltage to within 25 mV (<1%) for pulse and constant current profiles at rates up to 50C. The modeling methodology is valid for all types of porous electrode Li-ion batteries not operating under severe electrolyte transport limitations. A linear Kalman filter is designed for real-time estimation of internal potentials, concentration gradients, and SOC. A reference current governor predicts operating margin with respect to electrode side reactions and surface depletion/saturation conditions responsible for damage and sudden loss of power. Estimates are compared with the nonlinear CFD model. The linear filter gives to within ~2% performance in the 30-70%… Advisors/Committee Members: Chair%22%29&pagesize-30">Chao Yang Wang, Committee Chair/Co-Chair, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Qian Wang, Committee Member, Joseph Paul Cusumano, Committee Member, Karen Ann Thole, Committee Member.

Subjects/Keywords: lithium ion; battery; hybrid electric vehicle; model order reduction; diffusion systems; state of charge estimation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Smith, K. A. (2008). Electrochemical Modeling, Estimation and Control of Lithium Ion Batteries. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/7376

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Smith, Kandler A. “Electrochemical Modeling, Estimation and Control of Lithium Ion Batteries.” 2008. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/7376.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Smith, Kandler A. “Electrochemical Modeling, Estimation and Control of Lithium Ion Batteries.” 2008. Web. 04 Mar 2021.

Vancouver:

Smith KA. Electrochemical Modeling, Estimation and Control of Lithium Ion Batteries. [Internet] [Thesis]. Penn State University; 2008. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/7376.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Smith KA. Electrochemical Modeling, Estimation and Control of Lithium Ion Batteries. [Thesis]. Penn State University; 2008. Available from: https://submit-etda.libraries.psu.edu/catalog/7376

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

11. Trivedi, Deepak. Modeling, Optimal Design, Shape Estimation and Workspace Analysis of Soft Robotic Manipulators .

Degree: 2010, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/10858

► Traditional robot manipulators have rigid links and can manipulate objects only using their specialized end effectors. They encounter difficulties operating in unstructured and highly congested… (more)

▼ Traditional robot manipulators have rigid links and can manipulate objects only using their specialized end effectors. They encounter difficulties operating in unstructured and highly congested environments. Several animal organs such as elephant trunks, mammal and lizard tongues, and octopus arms address this problem by not having any rigid components. These muscular hydrostats are composed of natural muscles and connective tissue. Animal muscle is soft material with large strain, moderate stress, high efficiency, fast response time, high power/weight ratio and long lifetime, capabilities that conventional actuators do not possess. Researchers have been inspired by biology to design, build and test soft robotic manipulators based on electro-active polymers and pneumatic muscles. The unusual compliance and redundant degrees of freedom of these manipulators are essential for applications requiring delicate manipulation in cluttered and/or unstructured environments. With no hard parts, these robots can squeeze through tiny spaces and manipulate objects of widely-varying sizes. A key challenge in the design and control of soft robotic manipulators is the development of accurate models that predict the shape of the arm given the loading and actuation inputs. Existing models make several assumptions about the material properties, loading conditions and kinematics of these manipulators and are not sufficiently accurate under in real world situations. The first contribution of this thesis is the development of geometrically exact models that describe the dynamics of soft robotic manipulators that can be used in design, sensing, stability analysis, and control. The manipulator is modeled using Cosserat rod theory and takes into account the effect of finite shear, curvature and extension, and material nonlinearities. The model is validated on the OctArm V manipulator. Parametric studies are done with the model to gain an understanding of the mechanics of soft robotic manipulators, providing insight into the optimal design of pneumatic and hydraulic soft manipulators. Theoretically, soft robots have infinite degrees of freedom (dof), but the number of sensors and actuators are limited. This complicates shape estimation and control of soft robotic manipulators. The second contribution of this thesis is the development of three novel methods of shape estimation for soft robotic manipulators based on the geometrically exact model. The first method uses load cells mounted at the base of the manipulator and the second method makes use of cable encoders running through the length of the manipulator. The third method uses inclinometers mounted at the end of each section of the manipulator. Using simulation and experiments these methods are compared for the accuracy of endpoint position estimation for unloaded and loaded OctArm VI. OctArm-type soft robotic manipulators are complex and difficult to design and fabricate. The third major contribution of this thesis is a simpler, cost effective design for a pneumatic… Advisors/Committee Members: Christopher Rahn, Dissertation Advisor/Co-Advisor, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Eric M Mockensturm, Committee Member, George A Lesieutre, Committee Member, Mary I Frecker, Committee Member.

Subjects/Keywords: continuum mechanics; design optimization cosserat rod; soft robotic manipulators; pneumatic air muscles

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Trivedi, D. (2010). Modeling, Optimal Design, Shape Estimation and Workspace Analysis of Soft Robotic Manipulators . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/10858

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Trivedi, Deepak. “Modeling, Optimal Design, Shape Estimation and Workspace Analysis of Soft Robotic Manipulators .” 2010. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/10858.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Trivedi, Deepak. “Modeling, Optimal Design, Shape Estimation and Workspace Analysis of Soft Robotic Manipulators .” 2010. Web. 04 Mar 2021.

Vancouver:

Trivedi D. Modeling, Optimal Design, Shape Estimation and Workspace Analysis of Soft Robotic Manipulators . [Internet] [Thesis]. Penn State University; 2010. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/10858.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Trivedi D. Modeling, Optimal Design, Shape Estimation and Workspace Analysis of Soft Robotic Manipulators . [Thesis]. Penn State University; 2010. Available from: https://submit-etda.libraries.psu.edu/catalog/10858

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

12. Cheong, Jongpil. DESIGN, FABRICATION, MODELING, AND EXPERIMENTAL TESTING OF A PIEZOELECTRIC FLEXTENSIONAL MICROACTUATOR.

Degree: 2008, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/6580

► The necessity for reliable and low-cost microactuators capable of providing high resolution displacements and controlled force has been consistently being brought up because of their… (more)

▼ The necessity for reliable and low-cost microactuators capable of providing high resolution displacements and controlled force has been consistently being brought up because of their applications in RF and optical switches, microfluidic pumps and valves, micromanipulators for nanoscale handling and atomic force microscope drives. In this thesis, a piezoelectric flextensional microactuator is designed, fabricated, modeled, and tested for the amplification of the small piezoelectric strain to achieve large displacements. Bulk PZT material available in the form of 500 ¥ìm thick polished substrate is integrated with a precision micromachined silicon beam structure to fabricate the clamped-clamped flextensional microactuator. A high strength, high precision, and low temperature (~200 ¡ÆC) In/Sn solder bonding process is developed and used to bond the PZT and the beam. This process can also be used for the heterogeneous integration of various materials for MEMS fabrication as well as for their packaging. The experimentally measured static deflection characteristics of the silicon micromachined beam show a flextensional gain factor of 20 with a large amplitude stroke of ~8 ¥ìm when actuated using -100 V to 100 V. The fabrication process produces devices with variable initial imperfection so a nonlinear model is developed to predict static and dynamic performance based on a polynomial curve fit of the initial shape. A static analysis of this model shows that for maximal actuator displacement, gain factor, and blocked force, the microactuator should have a thin beam structure and initial imperfection tuned to the maximum contraction provided by the PZT. For large PZT displacement, a perfect beam provides maximum gain factor but some imperfection is required to guarantee actuator movement in the desired (up or down) direction. For small PZT displacement, more initial imperfection improves performance. The theoretical model, based on the measured initial beam shape, predicts the experimentally measured direction and magnitude of beam displacement for three devices. The dynamic response of the microactuator results from buckling of the clamped beam in response to contraction of the bonded PZT support. Unlike previous research where sinusoidal initial beam shapes are analyzed, in this work the polynomial initial beam shape enables more accurate prediction of beam natural frequencies, frequency response, and time response when compared with experimental results. The inclusion of squeeze film damping between the beam and PZT support enables the model to predict response times. Experiments show that mounting the PZT with soft carbon tape limits PZT vibration. Advisors/Committee Members: Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Chair%22%29&pagesize-30">Srinivas A Tadigadapa, Committee Chair/Co-Chair, Eric M Mockensturm, Committee Member, Md Amanul Haque, Committee Member.

Subjects/Keywords: Buckling; PZT; beam; flextensional; microactuator

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cheong, J. (2008). DESIGN, FABRICATION, MODELING, AND EXPERIMENTAL TESTING OF A PIEZOELECTRIC FLEXTENSIONAL MICROACTUATOR. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/6580

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cheong, Jongpil. “DESIGN, FABRICATION, MODELING, AND EXPERIMENTAL TESTING OF A PIEZOELECTRIC FLEXTENSIONAL MICROACTUATOR.” 2008. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/6580.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cheong, Jongpil. “DESIGN, FABRICATION, MODELING, AND EXPERIMENTAL TESTING OF A PIEZOELECTRIC FLEXTENSIONAL MICROACTUATOR.” 2008. Web. 04 Mar 2021.

Vancouver:

Cheong J. DESIGN, FABRICATION, MODELING, AND EXPERIMENTAL TESTING OF A PIEZOELECTRIC FLEXTENSIONAL MICROACTUATOR. [Internet] [Thesis]. Penn State University; 2008. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/6580.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cheong J. DESIGN, FABRICATION, MODELING, AND EXPERIMENTAL TESTING OF A PIEZOELECTRIC FLEXTENSIONAL MICROACTUATOR. [Thesis]. Penn State University; 2008. Available from: https://submit-etda.libraries.psu.edu/catalog/6580

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

13. Kim, Gi-Woo. DESIGN AND NONLINEAR FORCE CONTROL OF A POWER-BY-WIRE PIEZOELECTRIC-HYDRAULIC PUMP ACTUATOR FOR AUTOMOTIVE TRANSMISSIONS .

Degree: 2009, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/9309

► In this dissertation research, a new concept of actuation system and corresponding control method are developed for automotive automatic transmission (in short, AT) shift control.… (more)

▼ In this dissertation research, a new concept of actuation system and corresponding control method are developed for automotive automatic transmission (in short, AT) shift control. A piezoelectric-hydraulic pump (in short, PHP) based actuation system can be one of the potential alternatives that can replace a current electro-hydraulic actuation system for an automatic transmission friction element such as a band brake. In this dissertation, a stand-alone prototype of the PHP actuator is synthesized with the new concept of power-by-wire actuation, with a primary emphasis on the development of required performance for AT shift control. The fundamental performance of a prototype PHP is evaluated through the measuring of the flow rate and dead-head pressures. In addition, both the effects of a Helmholtz resonator and a fluid effective bulk modulus on the performance are experimentally examined. Next, a nonlinear sliding mode controller is developed for actuation force tracking control of the piezoelectric-hydraulic pump based actuation system. With a derived governing equation of motion of the PHP-band brake actuation system, a simple but effective switching control law is synthesized based on the sliding mode theory for the given nonlinear system. To demonstrate the effectiveness of the proposed controller, its force tracking performance for a smooth engaging of friction elements during the AT 1 „³ 2 up shift is validated experimentally. In addition, implementation method using a two-level driver that is appropriate for a pulse-driven actuator is established. It not only can successfully track the desired force trajectory for AT shift control with small tracking error, but also provides a new opportunity for pressure control of fluid power systems, eliminating three traditional hydraulic components: oil pump, regulating valve, and control valve. These promising results demonstrate the potential of the PHP actuator as a new controllable actuation system for AT friction elements. Finally, the PHP actuator and controller are applied to the automatic transmission shift control scenario to examine the effectiveness of the new power-by-wire actuation concept. To do this, a real time automotive power train model is first synthesized to develop the simulation model for hardware-in-the-loop simulation. Only power on 1 „³ 2 up shift model using band brake as on-coming friction element and one-way clutch as off-going friction element is provided for evaluating the single actuator performances. In addition, both fill volume control to prevent over-fill and the desired force trajectory learning control for AT shift controller are designed to achieve the enhanced shift performance. With the real time power train model and the PHP actuator, the whole structure of HILS is constructed, and its successful use in the development of AT shift control system is presented to demonstrate the feasibility and benefits of using the new PHP actuator. Advisors/Committee Members: Dr Kon Well Wang, Dissertation Advisor/Co-Advisor, Chair%22%29&pagesize-30">Kon Well Wang, Committee Chair/Co-Chair, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Mary I Frecker, Committee Member, George A Lesieutre, Committee Member.

Subjects/Keywords: Piezoelectric-Hydraulic Pump; Automotive Transmission; Nonlinear Force Control

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kim, G. (2009). DESIGN AND NONLINEAR FORCE CONTROL OF A POWER-BY-WIRE PIEZOELECTRIC-HYDRAULIC PUMP ACTUATOR FOR AUTOMOTIVE TRANSMISSIONS . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/9309

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kim, Gi-Woo. “DESIGN AND NONLINEAR FORCE CONTROL OF A POWER-BY-WIRE PIEZOELECTRIC-HYDRAULIC PUMP ACTUATOR FOR AUTOMOTIVE TRANSMISSIONS .” 2009. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/9309.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kim, Gi-Woo. “DESIGN AND NONLINEAR FORCE CONTROL OF A POWER-BY-WIRE PIEZOELECTRIC-HYDRAULIC PUMP ACTUATOR FOR AUTOMOTIVE TRANSMISSIONS .” 2009. Web. 04 Mar 2021.

Vancouver:

Kim G. DESIGN AND NONLINEAR FORCE CONTROL OF A POWER-BY-WIRE PIEZOELECTRIC-HYDRAULIC PUMP ACTUATOR FOR AUTOMOTIVE TRANSMISSIONS . [Internet] [Thesis]. Penn State University; 2009. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/9309.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kim G. DESIGN AND NONLINEAR FORCE CONTROL OF A POWER-BY-WIRE PIEZOELECTRIC-HYDRAULIC PUMP ACTUATOR FOR AUTOMOTIVE TRANSMISSIONS . [Thesis]. Penn State University; 2009. Available from: https://submit-etda.libraries.psu.edu/catalog/9309

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

14. Kommepalli, Hareesh Kumar Reddy. DESIGN, MODELING AND OPTIMIZATION OF PIEZOELECTRIC ACTUATORS .

Degree: 2010, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/10439

► Microactuators provide controlled motion and force for applications ranging from RF switches to microfluidic valves. Large amplitude response in piezoelectric actuators requires amplification of the… (more)

▼ Microactuators provide controlled motion and force for applications ranging from RF switches to microfluidic valves. Large amplitude response in piezoelectric actuators requires amplification of the small strain, exhibited by the piezoelectric material, used in the construction of such actuators. This research studies a uniflex microactuator that combines the strain amplification mechanisms of a unimorph and flexural motion to produce large displacement and blocking force. The design and fabrication of the proposed uniflex microactuator are described in detail. An analytical model is developed with three connected beams and a reflective symmetric boundary condition that predicts actuator displacement and blocking force as a function of the applied voltage. The model shows that the uniflex design requires appropriate parameter ranges, especially the clearance between the unimorph and aluminum cap, to ensure that both the unimorph and flexural amplification effects are realized. With a weakened joint at the unimorph/cap interface, the model is found to predict the displacement and blocking force for the actuators fabricated in this work. This research also compares the performance of a uniflex actuator in terms of its displacement and blocking force with uniflex and flextensional actuators. Analytical models for displacement and blocking force for all the three actuators are used in optimization, to study their relative performance. The uniflex actuator outperforms both unimorph and flextensional actuators in displacement, but, the unimorph actuator generates more blocking force. The uniflex actuator can therefore be used in applications that demand higher displacement and lower blocking force compared to a unimorph actuator. This research introduces a novel T-beam actuator that can be fabricated by micromachining using a piezoelectric MEMS fabrication process or by dicing using a saw. With a T-shaped cross-section, and bottom and top flange and web electrodes, a cantilevered beam can bend in-plane and out-of-plane with unimorph actuation in both directions. Analytical models are developed to predict displacement, blocking force, and mechanical energy. Six prototypes of these T-beam actuators are fabricated by dicing and electrodes are deposited by photolithography and experimentally tested. The experimentally validated models are used to optimize the cross-section geometry for maximum displacement, blocking force, and mechanical energy. It is found that a cross section with ratio of web width b to total width s , b*, and flange thickness, t, to total height, h, t*, approaching zero produces maximum displacement. Also, the tip displacement is independent of bounding box of T-beam. The cross section with b*=t*=0.381 produces maximum blocking force, while, b*=0.25, t*=0.33 produces maximum mechanical energy. A properly designed T-beam has better free tip displacement per unit cross section area than a unimorph. Also, a flange actuated T-beam requires lower voltage than a unimorph to generate same electric… Advisors/Committee Members: Christopher Rahn, Dissertation Advisor/Co-Advisor, Chair%22%29&pagesize-30">Christopher Rahn, Committee Chair/Co-Chair, Chair%22%29&pagesize-30">Srinivas A Tadigadapa, Committee Chair/Co-Chair, Ashok D Belegundu, Committee Member, Md Amanul Haque, Committee Member, Christopher L Muhlstein, Committee Member.

Subjects/Keywords: Tbeam; unimorph; piezoelectric actuators; uniflex; flextensional; MEMS

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kommepalli, H. K. R. (2010). DESIGN, MODELING AND OPTIMIZATION OF PIEZOELECTRIC ACTUATORS . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/10439

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kommepalli, Hareesh Kumar Reddy. “DESIGN, MODELING AND OPTIMIZATION OF PIEZOELECTRIC ACTUATORS .” 2010. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/10439.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kommepalli, Hareesh Kumar Reddy. “DESIGN, MODELING AND OPTIMIZATION OF PIEZOELECTRIC ACTUATORS .” 2010. Web. 04 Mar 2021.

Vancouver:

Kommepalli HKR. DESIGN, MODELING AND OPTIMIZATION OF PIEZOELECTRIC ACTUATORS . [Internet] [Thesis]. Penn State University; 2010. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/10439.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kommepalli HKR. DESIGN, MODELING AND OPTIMIZATION OF PIEZOELECTRIC ACTUATORS . [Thesis]. Penn State University; 2010. Available from: https://submit-etda.libraries.psu.edu/catalog/10439

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