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University of Houston
1.
Phifer, Virginia.
AC Loss Modeling in HTS Machines for Turboelectric Propulsion in Aircraft.
Degree: MS, Mechanical Engineering, 2017, University of Houston
URL: http://hdl.handle.net/10657/4764 
► As environmental concern increases, the aircraft industry is looking toward distributed propulsion to improve efficiency and reduce emissions. Superconducting turbo-electric motors and generators replace traditional…
(more)
▼ As environmental concern increases, the aircraft industry is looking toward distributed propulsion to improve efficiency and reduce emissions. Superconducting turbo-electric motors and generators replace traditional high-bypass ratio turbine engines. However, superconductors are susceptible to large AC losses when subjected to variable magnetic fields. Thus accurate loss calculations are crucial in determining the optimum weight of a superconducting machine. This paper expands upon 3-D models, comprising a low fidelity zeroth order and high fidelity electromagnetic, thermal, and structural models, developed to size fully superconducting machines. Improvements focused on the electromagnetic analysis in the zeroth order model by updating solutions to the magnetic field and AC losses, resulting in more accurate solutions. Many superconducting machines use copper stator windings, eliminating large AC losses, but copper is resistive, requiring more mass to produce the same power as a superconductor. The mass of fully and partially superconducting machines was compared to determine which system is better suited for turbo-electric propulsion.
Advisors/Committee Members: Masson, Philippe J. (advisor), Sharma, Pradeep (committee member), Yang, Di (committee member).
Subjects/Keywords: Superconductivity; High-temperature superconductors; Aircraft propulsion; AC losses; Hysteresis; Superconducting generator; AC losses
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APA (6th Edition):
Phifer, V. (2017). AC Loss Modeling in HTS Machines for Turboelectric Propulsion in Aircraft. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/4764
Chicago Manual of Style (16th Edition):
Phifer, Virginia. “AC Loss Modeling in HTS Machines for Turboelectric Propulsion in Aircraft.” 2017. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/4764.
MLA Handbook (7th Edition):
Phifer, Virginia. “AC Loss Modeling in HTS Machines for Turboelectric Propulsion in Aircraft.” 2017. Web. 19 Jan 2021.
Vancouver:
Phifer V. AC Loss Modeling in HTS Machines for Turboelectric Propulsion in Aircraft. [Internet] [Masters thesis]. University of Houston; 2017. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/4764.
Council of Science Editors:
Phifer V. AC Loss Modeling in HTS Machines for Turboelectric Propulsion in Aircraft. [Masters Thesis]. University of Houston; 2017. Available from: http://hdl.handle.net/10657/4764
University of Houston
2.
Gampa, Ravishanker Venkata.
Powering Particle Accelerators.
Degree: MS, Mechanical Engineering, 2017, University of Houston
URL: http://hdl.handle.net/10657/4544
► This thesis considers the design of power supplies for the magnetic and electrical dipoles used in typical particle accelerators. First the thermoelectric current generation system…
(more)
▼ This thesis considers the design of power supplies for the magnetic and electrical dipoles used in typical particle accelerators. First the thermoelectric current generation system is studied, its high current, low voltage properties as they apply to the power supply for a superconducting coil magnet are presented and results of experiments to characterize the thermoelectric modules are explained. Subsequently, the design of a high voltage, low current power supply is developed from the concept of a high voltage multiplier and the results of simulation in SPICE of the design for performance analysis are presented.
Advisors/Committee Members: Masson, Philippe J. (advisor), Provence, Robert S. (committee member), Kulkarni, Yashashree (committee member).
Subjects/Keywords: Thermoelectric module; Power supply; High voltage low current; High current low voltage; Electric dipole; Magnetic dipole; Superconductivity
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APA (6th Edition):
Gampa, R. V. (2017). Powering Particle Accelerators. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/4544
Chicago Manual of Style (16th Edition):
Gampa, Ravishanker Venkata. “Powering Particle Accelerators.” 2017. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/4544.
MLA Handbook (7th Edition):
Gampa, Ravishanker Venkata. “Powering Particle Accelerators.” 2017. Web. 19 Jan 2021.
Vancouver:
Gampa RV. Powering Particle Accelerators. [Internet] [Masters thesis]. University of Houston; 2017. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/4544.
Council of Science Editors:
Gampa RV. Powering Particle Accelerators. [Masters Thesis]. University of Houston; 2017. Available from: http://hdl.handle.net/10657/4544
University of Houston
3.
-9597-8591.
Evaluation of Implementing Thermoelectric Materials as a Power Generator.
Degree: MS, Mechanical Engineering, 2016, University of Houston
URL: http://hdl.handle.net/10657/3198
► The challenge of finding new energy sources or improving the efficiency of machines has become an important priority to scientists. A huge portion of provided…
(more)
▼ The challenge of finding new energy sources or improving the efficiency of machines has become an important priority to scientists. A huge portion of provided energy becomes waste in the form of thermal energy. This fact sets the stage to look at recovering this wasted heat by Direct Heat-to-Electricity Conversion. Thermoelectric materials provide the opportunity to convert heat to electricity by thermoelectric generators (TEGs), which work under the Seebeck Effect. In this study, we focused on two less developed applications of TEGs. First, the feasibility of exciting High Temperature Superconductor coils by means of a TEG has been investigated. In this study, a physical model of the system in Simscape™/MATLAB has been prepared. Second, we focused on energy recovery from the waste heat source in cylindrical shaped equipment. An analytical approach has been served to offer the relation between geometrical variables or thermoelectric properties, and the maximum output power of Tubular Thermoelectric Generators (TTEGs).
Advisors/Committee Members: Masson, Philippe J. (advisor), Mavrokefalos, Anastassios (committee member), Tekin, Eylem (committee member).
Subjects/Keywords: Thermoelectrics; Tubular thermoelectric; Thermoelectric generators (TEG); TTEG; Seebeck effect; Energy harvesting; Energy recovery; Heat recovery; HTS; Simscape; TTEGs
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APA (6th Edition):
-9597-8591. (2016). Evaluation of Implementing Thermoelectric Materials as a Power Generator. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/3198
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-9597-8591. “Evaluation of Implementing Thermoelectric Materials as a Power Generator.” 2016. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/3198.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-9597-8591. “Evaluation of Implementing Thermoelectric Materials as a Power Generator.” 2016. Web. 19 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-9597-8591. Evaluation of Implementing Thermoelectric Materials as a Power Generator. [Internet] [Masters thesis]. University of Houston; 2016. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/3198.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-9597-8591. Evaluation of Implementing Thermoelectric Materials as a Power Generator. [Masters Thesis]. University of Houston; 2016. Available from: http://hdl.handle.net/10657/3198
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Houston
4.
Khoury, George Charles.
Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors.
Degree: MS, Mechanical Engineering, 2014, University of Houston
URL: http://hdl.handle.net/10657/1388
► Many non-destructive damage detection problems are presented with the challenge where limited sensor sets allow the measurement of fewer degrees of freedom than the analytical…
(more)
▼ Many non-destructive damage detection problems are presented with the challenge where limited sensor sets allow the measurement of fewer degrees of freedom than the analytical model. This study utilized damage residual expansion methods to determine the overall structural damage locations with reduced sensor sets. The new methods presented were the Modified Method of Expanded Dynamic Residuals and the Dot Product Damage Residual Expansion Method. Ritz vectors were also used with various sensor placement techniques to modify the sensor sets and focus the damage detection capabilities towards elements of interest. The results showed that the modified damage residual expansion methods were able to locate the damaged elements, while also simplifying the selection process, by employing the dot product method and the elemental disassembly. Additionally, the sensor set variations effectively focused the damage detection results towards elements of interest by modifying the Ritz vector loadings.
Advisors/Committee Members: Franchek, Matthew A. (advisor), Grigoriadis, Karolos M. (committee member), Provence, Robert S. (committee member), Masson, Philippe J. (committee member).
Subjects/Keywords: Damage Detection; Minimum Rank Perturbation Theory; Damage Residuals; Method of Expanded Dynamic Residuals; Modified Method of Expanded Dynamic Residuals; Dot Product Damage Residual Expansion Method; Ritz Vectors
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APA (6th Edition):
Khoury, G. C. (2014). Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1388
Chicago Manual of Style (16th Edition):
Khoury, George Charles. “Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors.” 2014. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1388.
MLA Handbook (7th Edition):
Khoury, George Charles. “Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors.” 2014. Web. 19 Jan 2021.
Vancouver:
Khoury GC. Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors. [Internet] [Masters thesis]. University of Houston; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1388.
Council of Science Editors:
Khoury GC. Analyzing the Effects of Force Variations on Expanded Residual Damage Detection using Load Dependent Ritz Vectors. [Masters Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1388
University of Houston
5.
Kesgin, Ibrahim 1983-.
PROCESSING AND ELECTROMAGNETIC PROPERTIES OF LOW AC LOSS, MULTIFILAMENTARY RARE EARTH-BARIUM-COPPER-OXIDE SUPERCONDUCTOR TAPES.
Degree: PhD, Mechanical Engineering, 2013, University of Houston
URL: http://hdl.handle.net/10657/1201
► Extensive AC losses are a major impediment for the use of second generation (2G) high temperature superconducting (HTS) rare earth-Ba-Cu-O (REBCO) coated conductors (CC) in…
(more)
▼ Extensive AC losses are a major impediment for the use of second generation (2G) high temperature superconducting (HTS) rare earth-Ba-Cu-O (REBCO) coated conductors (CC) in AC applications. Filamentization has been shown to be a viable method to reduce magnetization AC losses. Different techniques have been developed including the removal of the thick copper stabilizer layer. Non-uniform ablation, re-deposition of the removed metal, excessive degradation of the critical current, and limited throughput are some of the drawbacks associated with these techniques. In this dissertation, striation methods were developed to address these issues. For the first time, a thick copper stabilizer layer has been selectively-electroplated onto the superconducting filaments. By oxidizing the striated grooves, the striations remain copper-free due to the formation of a resistive oxide layer in between the filaments. The influence of stabilizer thickness on fully-filamentized CCs has also been investigated. The results showed no significant loss contribution from increasing the stabilizer thickness up to 30 µm in fully-filamentized tapes. This thickness should be sufficient for most of the targeted AC applications of coated conductors. Filament widths as small as 180 µm have been fabricated successfully for the first time without compromising the beneficial effect of striations on the AC losses. The loss measurements were performed in a frequency range of 40 to 500 Hz at 77K and compared with theoretical models. The experimental data agrees well with these models above the penetration fields. The adhesion strength of the conductors has also been enhanced approximately three-fold due to the reduced number of defects after modification of the composition of the REBCO film. The techniques developed in this dissertation could potentially be transferred to large-scale manufacturing of stabilized, low loss, multifilament coated conductors.
Advisors/Committee Members: Selvamanickam, Venkat (advisor), Wolfe, John C. (committee member), Liu, Dong (committee member), Masson, Philippe J. (committee member), Ardebili, Haleh (committee member).
Subjects/Keywords: AC losses; Filamentization; Selective electroplating; Laser ablation; Delamination; 2G-HTS; Superconductors; Coated conductors; Critical current; Multifilamentary; REBCO
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APA (6th Edition):
Kesgin, I. 1. (2013). PROCESSING AND ELECTROMAGNETIC PROPERTIES OF LOW AC LOSS, MULTIFILAMENTARY RARE EARTH-BARIUM-COPPER-OXIDE SUPERCONDUCTOR TAPES. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1201
Chicago Manual of Style (16th Edition):
Kesgin, Ibrahim 1983-. “PROCESSING AND ELECTROMAGNETIC PROPERTIES OF LOW AC LOSS, MULTIFILAMENTARY RARE EARTH-BARIUM-COPPER-OXIDE SUPERCONDUCTOR TAPES.” 2013. Doctoral Dissertation, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1201.
MLA Handbook (7th Edition):
Kesgin, Ibrahim 1983-. “PROCESSING AND ELECTROMAGNETIC PROPERTIES OF LOW AC LOSS, MULTIFILAMENTARY RARE EARTH-BARIUM-COPPER-OXIDE SUPERCONDUCTOR TAPES.” 2013. Web. 19 Jan 2021.
Vancouver:
Kesgin I1. PROCESSING AND ELECTROMAGNETIC PROPERTIES OF LOW AC LOSS, MULTIFILAMENTARY RARE EARTH-BARIUM-COPPER-OXIDE SUPERCONDUCTOR TAPES. [Internet] [Doctoral dissertation]. University of Houston; 2013. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1201.
Council of Science Editors:
Kesgin I1. PROCESSING AND ELECTROMAGNETIC PROPERTIES OF LOW AC LOSS, MULTIFILAMENTARY RARE EARTH-BARIUM-COPPER-OXIDE SUPERCONDUCTOR TAPES. [Doctoral Dissertation]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/1201
University of Houston
6.
Song, Shuangqi 1982-.
Electrochemical Synthesis of Magnetic Nanostructures for Mutifunctionalization.
Degree: PhD, Materials Engineering, 2012, University of Houston
URL: http://hdl.handle.net/10657/771
► Compared to the traditional physical vapor deposition or chemical synthesis methods, electrochemical deposition has the advantages of low cost, high yield, low processing temperature and…
(more)
▼ Compared to the traditional physical vapor deposition or chemical synthesis methods, electrochemical deposition has the advantages of low cost, high yield, low processing temperature and is easy to scale-up. In this study, we aim to reveal the nanoscale electrochemical growth mechanism and develop efficient electrochemical based approaches to produce multifunctional nanomaterials and structures that are difficult to obtain by other synthesis methods. This study focuses on developing electrochemical based nanomanufacturing techniques to synthesize magnetic nanostructures with controllable size, morphology, composition and structure with cost efficiency and scalability. The dissertation includes two research themes: 1) Electrodeposition mechanism study of metallic nanostructure on carbon micro- nano-structure surfaces; and 2) Electrochemical synthesis of non-spherical magnetic nanostructures for bio-medical applications.
By combining synchrotron x-ray diffraction/fluorescence and special electrochemical experimental setup design, we demonstrated real time, non-contact and high resolution composition and structure characterization capabilities for electrochemical processes. As an example, we systematically studied the solution concentration, pH value and deposition potential effects on the Ni nucleation, growth, stability and dissolution on the surfaces of carbon micro- and nano-materials. When acidic electroplating solutions are used, the deposited Ni nuclei are found to have strong size dependent instability and can dissolve chemically. This stability also depends on deposition potential; a passivation layer can form under more negative deposition potential which can prevent chemical dissolution and even electrochemical dissolution. At the micron and below dimensions, the substrate surface curvature also shows significant impact on the deposition rate and efficiency when compared to conventional flat substrates.
To explore the unique synthesis capability of electrochemical synthesis and application potential of non-spherical nanomaterials, we have fabricated high aspect ratio Fe nanowires with sizes suitable for bio-medical applications. In situ synchrotron diffraction has again been used to provide real time compositional and crystallographic information during electrodeposition. The composition of nanowires with iron at the core and iron oxide at the surface can also be confirmed by TEM-EDS and XPS study. The biocompatibility of the Fe nanowires has been evaluated by using rat-2 fibroblast cells. In summary, through the study of nanoscale nucleation, growth and micro-structure evolution, this research helps to quantify the nanoscale electrochemical process, establish structure-properties correlation and develop novel magnetic materials applications.
Advisors/Committee Members: Sun, Li (advisor), Ardebili, Haleh (committee member), Bao, Jiming (committee member), Masson, Philippe J. (committee member), Song, Gangbing (committee member).
Subjects/Keywords: Electrochemistry; Nanostructures; Magnetic materials; Materials engineering
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APA (6th Edition):
Song, S. 1. (2012). Electrochemical Synthesis of Magnetic Nanostructures for Mutifunctionalization. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/771
Chicago Manual of Style (16th Edition):
Song, Shuangqi 1982-. “Electrochemical Synthesis of Magnetic Nanostructures for Mutifunctionalization.” 2012. Doctoral Dissertation, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/771.
MLA Handbook (7th Edition):
Song, Shuangqi 1982-. “Electrochemical Synthesis of Magnetic Nanostructures for Mutifunctionalization.” 2012. Web. 19 Jan 2021.
Vancouver:
Song S1. Electrochemical Synthesis of Magnetic Nanostructures for Mutifunctionalization. [Internet] [Doctoral dissertation]. University of Houston; 2012. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/771.
Council of Science Editors:
Song S1. Electrochemical Synthesis of Magnetic Nanostructures for Mutifunctionalization. [Doctoral Dissertation]. University of Houston; 2012. Available from: http://hdl.handle.net/10657/771
University of Houston
7.
Mbarki, Raouf.
Atomistic and Continuum Study of flexoelectricity in ferroelectric materials.
Degree: PhD, Mechanical Engineering, 2014, University of Houston
URL: http://hdl.handle.net/10657/1795
► In this dissertation, we try to address some of the questions which arise while studying flexoelectricity in ferroelectric materials. 1. Most technologically-relevant ferroelectrics typically lose…
(more)
▼ In this dissertation, we try to address some of the questions which arise while studying flexoelectricity in ferroelectric materials.
1. Most technologically-relevant ferroelectrics typically lose piezoelectricity above the Curie temperature. This limits their use to relatively low temperatures. In this dissertation, exploiting a combination of flexoelectricity and simple functional grading, we propose a strategy for high-temperature electromechanical coupling in a standard thin film configuration. We use continuum modeling to quantitatively demonstrate the possibility of achieving apparent piezoelectric materials with large and temperature-stable electromechanical coupling across a wide temperature range that extends significantly above the Curie temperature. With Barium and Strontium Titanate as example materials, a significant electromechanical coupling that is potentially temperature-stable up to 900 C is possible.
2. Piezoelectricity is a property of non-centrosymmetric crystals. In most typically used ferroelectrics, this property is lost as the temperature is increased beyond the Curie point thus strongly reducing the availability of efficient materials that can be used for high temperature energy harvesting. Flexoelectricity, as can be shown from simple symmetry arguments, is a universal and linear electromechanical coupling that dictates the development of polarization upon application of inhomogeneous strains. The implications of this phenomenon become amplified at the nanoscale. In this dissertation, we develop a molecular dynamics approach predicated on a specially tailored interatomic force-field to extract the temperature dependence of flexoelectricity. Surprisingly, we find that it, at least for Barium Titanate and Strontium Titanate nano structures, increases with temperature. Apart from cataloging this interesting observation for future use in high temperature energy harvesting, we also examine the physical mechanisms that lead to the observed temperature dependence.
3. A new theory for 180 domain wall in ferroelectric perovskite material is presented in this work. The effect of flexoelectric coupling on the domain structure is analyzed. We show that the 180 domain wall has a mixed character of Ising and Bloch type wall and that the polarization perpendicular to the domain wall is non zero though it is very small compared to the spontaneous polarization in the case of tetragonal Barium Titanate. Finally, we present the effect of the new finding on the domain wall interaction with defects in the material.
4. Pyroelectric materials generate electricity in response to change in temperature. These materials are commonly used to build temperature sensors, radiation detectors and alarm systems, among others. There are few materials that possess this property. In this work, we develop a nonlinear theoretical framework for pyroelectricity in soft materials. Using the concept of soft electrets materials, we illustrate a nonlinear relation between the Maxwell stress effect and pyroelectricity, and…
Advisors/Committee Members: Sharma, Pradeep (advisor), Gunaratne, Gemunu H. (committee member), Masson, Philippe J. (committee member), Kulkarni, Yashashree (committee member), Agrawal, Ashutosh (committee member).
Subjects/Keywords: Flexoelectricity; Piezoelectricity; Pyroelectricity; Electrets; Domain wall; Perovskite; Nanostructures; Molecular dynamics
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APA ·
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APA (6th Edition):
Mbarki, R. (2014). Atomistic and Continuum Study of flexoelectricity in ferroelectric materials. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1795
Chicago Manual of Style (16th Edition):
Mbarki, Raouf. “Atomistic and Continuum Study of flexoelectricity in ferroelectric materials.” 2014. Doctoral Dissertation, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1795.
MLA Handbook (7th Edition):
Mbarki, Raouf. “Atomistic and Continuum Study of flexoelectricity in ferroelectric materials.” 2014. Web. 19 Jan 2021.
Vancouver:
Mbarki R. Atomistic and Continuum Study of flexoelectricity in ferroelectric materials. [Internet] [Doctoral dissertation]. University of Houston; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1795.
Council of Science Editors:
Mbarki R. Atomistic and Continuum Study of flexoelectricity in ferroelectric materials. [Doctoral Dissertation]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1795
8.
Wu, Tingcheng.
DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE.
Degree: MS, Mechanical Engineering, 2014, University of Houston
URL: http://hdl.handle.net/10657/1454
► Because of their very high specific torque, fully superconducting rotating machines are considered as enabling technology for future turbo-electric propulsion for transportation aircraft. NASA is…
(more)
▼ Because of their very high specific torque, fully superconducting rotating machines are considered as enabling technology for future turbo-electric propulsion for transportation aircraft. NASA is funding the development of a high fidelity fully superconducting machine sizing tool able to generate optimized designs based on power requirements and design constraints.
In this thesis, a mechanical model of a rotor of fully superconducting motor with 4MW Power and 5000 RPM speed is designed. The model developed includes a realistic 3D geometry representation and is based on parametric design methods. COMSOL MultiPhysics has been used to validate the mechanical calculations including the thermal stress, strain, displacement and torque induced stress and deformation. This parametric model allows us to get the relationship between stress/strain and a series of parameters. This will help define the most proper materials and topology considering different required working conditions. The simulations allowed for a full characterization of the superconducting motor composite shaft and successfully validated the analytical estimation of the stress and deformation of the shaft and stator during cool down and under the effect of the applied torque.
Advisors/Committee Members: Masson, Philippe J. (advisor), Song, Gangbing (committee member), Provence, Robert S. (committee member), Yu, Cunjiang (committee member).
Subjects/Keywords: Fully superconducting machine; Design; ANALYZE
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APA (6th Edition):
Wu, T. (2014). DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1454
Chicago Manual of Style (16th Edition):
Wu, Tingcheng. “DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE.” 2014. Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/1454.
MLA Handbook (7th Edition):
Wu, Tingcheng. “DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE.” 2014. Web. 19 Jan 2021.
Vancouver:
Wu T. DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE. [Internet] [Masters thesis]. University of Houston; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/1454.
Council of Science Editors:
Wu T. DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE. [Masters Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1454
University of Houston
9.
Bidad, Pejman.
Cooling System Design for a Fully Superconducting Machine Used in Future Aircrafts.
Degree: MS, Mechanical Engineering, University of Houston
URL: http://hdl.handle.net/10657/2160
► Considering developments in superconducting machines (motors and generators), modern methods and innovations required for optimization in this field like any other energy-based systems. Meanwhile, some…
(more)
▼ Considering developments in superconducting machines (motors and generators), modern methods and innovations required for optimization in this field like any other energy-based systems. Meanwhile, some improvements in superconducting technologies has been drawn to flying sciences such as future turbo-electric aircrafts. Thus, companies and pioneers in this industry like NASA have been investing many resources on the aim of future aircrafts working based upon Turboelectric distributed propulsion (TeDP), Hybrid and/or electric propulsion systems. Based on the fact that superconducting machines could make gigantic saves in energy waste, they came into spotlight. This promising technology also requires demanding attentions in the area of ahead obstacles such as novel cooling methods; there have been some analyzes in this area, though. Regarding to this issue, this study is aimed to design cooling systems for superconducting machines working with liquid hydrogen (LH2) as coolant. The indirect cooling system, which is based on both convection and conduction, has been employed. Having all sort of designs and ideas, a meander and helical shape design is recommended for rotor and stator, respectively. The results should comprise two important goals: 1) providing cryogenic temperature for system 2) evaluating pressure and outlet phase of LH2 working in a loop. Hence, different conventional materials in cryogenic sciences have been analyzed and compared to the famous metallic mate like aluminum.
Advisors/Committee Members: Masson, Philippe J. (advisor), Ardebili, Haleh (committee member), Nikolaou, Michael (committee member).
Subjects/Keywords: Cryogenic; Cooling system; Superconducting machine; Future aircraft
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APA (6th Edition):
Bidad, P. (n.d.). Cooling System Design for a Fully Superconducting Machine Used in Future Aircrafts. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/2160
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Chicago Manual of Style (16th Edition):
Bidad, Pejman. “Cooling System Design for a Fully Superconducting Machine Used in Future Aircrafts.” Masters Thesis, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/2160.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
MLA Handbook (7th Edition):
Bidad, Pejman. “Cooling System Design for a Fully Superconducting Machine Used in Future Aircrafts.” Web. 19 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Vancouver:
Bidad P. Cooling System Design for a Fully Superconducting Machine Used in Future Aircrafts. [Internet] [Masters thesis]. University of Houston; [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/2160.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Council of Science Editors:
Bidad P. Cooling System Design for a Fully Superconducting Machine Used in Future Aircrafts. [Masters Thesis]. University of Houston; Available from: http://hdl.handle.net/10657/2160
Note: this citation may be lacking information needed for this citation format:
No year of publication.
University of Houston
10.
Brahmi, Hatem.
Experimental and Theoretical Investigation of Thermal, Thermoelectrical, Optical and Structural Properties in Nanostructures.
Degree: PhD, Mechanical Engineering, University of Houston
URL: http://hdl.handle.net/10657/3524
► Nanomaterials keep showing huge potential for diver electronic, computing, sensing, biomedical and energy conversion applications. Due to their size confinement effect, nanostructures materials (thin film,…
(more)
▼ Nanomaterials keep showing huge potential for diver electronic, computing, sensing, biomedical and energy conversion applications. Due to their size confinement effect, nanostructures materials (thin film, nanotubes, nanowires, two dimensional thick material and quantum dots) have very different physical properties compared to their bulk counterparts. Thus, they are promising candidates for more efficient solid state thermal, electronic, optical, biomedical devices. However it is very challenging to investigate their properties and detect their real potential.
This dissertation presents thermophysical, thermoelectric and optical characterization of nanotubes, 2D material and thin films. Three different nanostructures have been experimentally and theoretically investigated: Titania nanotubes TiO2, atomically thin molybdenum diselenide MoSe2 and nickel silicide NiSi ultrathin film. The thermal and thermoelectrical measurements for both TiO2 nanotubes and MoSe2 monolayer were performed using suspended micro fabricated devices that allows the simultaneous measurements of Seebeck coefficient S, electrical conductivity σ and thermal conductivity κ on the same nanostructure that eliminated the parasitic effects of thermal contact and electrical contact resistances from the measured properties. Also the microdevice presents a through-substrate hole under the suspended membranes that makes the structural characterization on the same sample possible using Transmission Electron Microscope (TEM) analysis TEM.
The assembly of the samples were performed using different techniques: First, the TiO2 nanotubes were assembled either by drop casting method or by use of a micromanipulator under an optical microscope the nanotube on the microdevice. Second, the PMMA transfer method that uses polymethyl methacrylate polymer as a transfer carrier for the monolayer MoSe2. In the second technique polymerization process was developed to anchor the sample to the device. For the TiO2 sample the measurements are done on both intrinsic, as synthesized, and doped samples and for both amorphous and polycrystalline anatase phase. The thermal conductivity of single nanotubes was found to be up six times lower than their bulk counterpart and very close to that of the amorphous phase. The thermoelectric properties were measured just for the doped samples and the results show semiconducting behavior which are sensitive to the doping concentration. Furthermore at high doping concentrations TiO2 nanotubes present an n-type behavior at high temperature, that switches to p-type behavior at very low temperature.
The same characterization method was used to measure the thermal conductivity of atomically thick (0.7 nm) monolayer MoSe2. The measurements are done on intrinsic and tungsten doped samples. The results (30 W/mK and 17 W/mK for intrinsic and tungsten doped samples respectively) reveal nanostructure behavior for the thermal conductivity and they are in agreement with the reported values from first principle calculations. Also, the results show…
Advisors/Committee Members: Mavrokefalos, Anastassios (advisor), White, Kenneth W. (committee member), Varghese, Oomman K. (committee member), Masson, Philippe J. (committee member), Ardebili, Haleh (committee member).
Subjects/Keywords: Thermal; Thermoelectrics; Optical; Characterization; Nanostructures
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APA (6th Edition):
Brahmi, H. (n.d.). Experimental and Theoretical Investigation of Thermal, Thermoelectrical, Optical and Structural Properties in Nanostructures. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/3524
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Chicago Manual of Style (16th Edition):
Brahmi, Hatem. “Experimental and Theoretical Investigation of Thermal, Thermoelectrical, Optical and Structural Properties in Nanostructures.” Doctoral Dissertation, University of Houston. Accessed January 19, 2021.
http://hdl.handle.net/10657/3524.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
MLA Handbook (7th Edition):
Brahmi, Hatem. “Experimental and Theoretical Investigation of Thermal, Thermoelectrical, Optical and Structural Properties in Nanostructures.” Web. 19 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Vancouver:
Brahmi H. Experimental and Theoretical Investigation of Thermal, Thermoelectrical, Optical and Structural Properties in Nanostructures. [Internet] [Doctoral dissertation]. University of Houston; [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10657/3524.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Council of Science Editors:
Brahmi H. Experimental and Theoretical Investigation of Thermal, Thermoelectrical, Optical and Structural Properties in Nanostructures. [Doctoral Dissertation]. University of Houston; Available from: http://hdl.handle.net/10657/3524
Note: this citation may be lacking information needed for this citation format:
No year of publication.
. 
Open Access Theses and Dissertations
