+publisher:"Virginia Tech" +contributor:("Zuo, Lei")

Virginia Tech

1. Jiang, Boxi. Performance Analysis and Tank Test Validation of a Hybrid Wave-Current Energy Converter with a Single Power Takeoff.

Degree: MS, Mechanical Engineering, 2020, Virginia Tech

URL: http://hdl.handle.net/10919/99211

► Ocean energy has been recognized as a promising power source due to its full-day availability and high energy potential. At this stage, ocean current energy,… (more)

▼ Ocean energy has been recognized as a promising power source due to its full-day availability and high energy potential. At this stage, ocean current energy, tidal energy and ocean wave energy are currently the most competitive sourves among all the categories of ocean energy. The state of art ocean energy harvesting technology mainly focus on harvesting either ocean wave energy or current energy, but not both. However, a significant amount of ocean waves and tidal/ ocean current coexist in many sites and traditional devices that harvest from a single form of ocean energy, cannot make full use of the coexisting energy resource. Furthermore, MHK energy harvesting devices need to advance to be cost-effective and competitive with other energy sources. This is difficult to achieve. Ocean wave height and wave periods are unpredictable and excitation forces on energy harvesting devices can have large variance in amplitude and frequency. Such restrictions can be possibly addressed by the concept of a hybrid energy converter. In this sense, a hybrid wave-current ocean energy conveter (HWCEC) that simutaneously harvests energy from current and wave with one single power takeoff (PTO), which consists of ball screw, gearbox, and generator, is designed.The wave energy is extracted through relative heaving motion between a floating buoy and a submerged second body, while the current energy is extracted using a marine current turbine (MCT). Energy from both sources are integrated by a hybrid PTO whose concept is based on a mechanical motion rectifier (MMR). In this study, different working modes are investigated together with switching criteria.Simulations were conducted with hydrodynamic coefficients obtained from computational fluid dynamics analysis and boundary element method. Tank tests were conducted for a HWCEC under co-existing wave and current inputs. For comparison, separate baseline tests of a turbine and a two-body, wave-energy-harvesting sructure, each acting in isolation, are conducted. Experimental results validate the dynamic modeling and show that a HWCEC can increase the output power with a range between 29-87 percent over either current turbine and wave energy converter acting individually, and it can reduce by up to 70 percent the peak-to-average power ratio compared with the wave energy converter on the tested conditions.Such results demonstrate the potential of the HWCEC as an efficient and cost-effective design. Advisors/Committee Members: Parker, Robert G. (committeechair), Zuo, Lei (committeechair), Chen, Bangfuh (committee member).

Subjects/Keywords: Ocean energy; Hybrid energy converting system; Power takeoff; Water tank test

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APA (6^th Edition):

Jiang, B. (2020). Performance Analysis and Tank Test Validation of a Hybrid Wave-Current Energy Converter with a Single Power Takeoff. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/99211

Chicago Manual of Style (16^th Edition):

Jiang, Boxi. “Performance Analysis and Tank Test Validation of a Hybrid Wave-Current Energy Converter with a Single Power Takeoff.” 2020. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/99211.

MLA Handbook (7^th Edition):

Jiang, Boxi. “Performance Analysis and Tank Test Validation of a Hybrid Wave-Current Energy Converter with a Single Power Takeoff.” 2020. Web. 27 Feb 2021.

Vancouver:

Jiang B. Performance Analysis and Tank Test Validation of a Hybrid Wave-Current Energy Converter with a Single Power Takeoff. [Internet] [Masters thesis]. Virginia Tech; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/99211.

Council of Science Editors:

Jiang B. Performance Analysis and Tank Test Validation of a Hybrid Wave-Current Energy Converter with a Single Power Takeoff. [Masters Thesis]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/99211

Virginia Tech

2. Todaria, Prakhar. Design, Modelling, and Test of an Electromagnetic Speed Bump Energy Harvester.

Degree: MS, Mechanical Engineering, 2016, Virginia Tech

URL: http://hdl.handle.net/10919/73795

► Speed bump energy harvester, which aims to harvest energy from the passing by vehicles by absorbing their kinetic and potential energy, is designed, fabricated, simulated,… (more)

Subjects/Keywords: speed bump; energy harvester; modelling; design; vehicle dynamics

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APA (6^th Edition):

Todaria, P. (2016). Design, Modelling, and Test of an Electromagnetic Speed Bump Energy Harvester. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/73795

Chicago Manual of Style (16^th Edition):

Todaria, Prakhar. “Design, Modelling, and Test of an Electromagnetic Speed Bump Energy Harvester.” 2016. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/73795.

MLA Handbook (7^th Edition):

Todaria, Prakhar. “Design, Modelling, and Test of an Electromagnetic Speed Bump Energy Harvester.” 2016. Web. 27 Feb 2021.

Vancouver:

Todaria P. Design, Modelling, and Test of an Electromagnetic Speed Bump Energy Harvester. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/73795.

Council of Science Editors:

Todaria P. Design, Modelling, and Test of an Electromagnetic Speed Bump Energy Harvester. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/73795

Virginia Tech

3. Tan, Li. A Computational Iteration Method to Analyze Mechanics of Timing Belt Systems with Non-Circular Pulleys.

Degree: MS, Mechanical Engineering, 2018, Virginia Tech

URL: http://hdl.handle.net/10919/84991

► Timing belt systems, usually consisting of a toothed belt and multiple pulleys, are used in many mechanical devices, especially in the internal combustion engine to… (more)

Subjects/Keywords: Timing Belt; Non-circular Pulley; Torque.

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APA (6^th Edition):

Tan, L. (2018). A Computational Iteration Method to Analyze Mechanics of Timing Belt Systems with Non-Circular Pulleys. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/84991

Chicago Manual of Style (16^th Edition):

Tan, Li. “A Computational Iteration Method to Analyze Mechanics of Timing Belt Systems with Non-Circular Pulleys.” 2018. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/84991.

MLA Handbook (7^th Edition):

Tan, Li. “A Computational Iteration Method to Analyze Mechanics of Timing Belt Systems with Non-Circular Pulleys.” 2018. Web. 27 Feb 2021.

Vancouver:

Tan L. A Computational Iteration Method to Analyze Mechanics of Timing Belt Systems with Non-Circular Pulleys. [Internet] [Masters thesis]. Virginia Tech; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/84991.

Council of Science Editors:

Tan L. A Computational Iteration Method to Analyze Mechanics of Timing Belt Systems with Non-Circular Pulleys. [Masters Thesis]. Virginia Tech; 2018. Available from: http://hdl.handle.net/10919/84991

Virginia Tech

4. Cooke, Daniel Benjamin. Design and Optimization of a Self-powered Thermoelectric Car Seat Cooler.

Degree: MS, Mechanical Engineering, 2018, Virginia Tech

URL: http://hdl.handle.net/10919/83374

► It is well known that the seats in a parked vehicle become very hot and uncomfortable on warm days. A new self-powered thermoelectric car seat… (more)

Subjects/Keywords: Non-dimensional Equations; Solar Thermoelectric Generator; Thermoelectric Cooler

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APA (6^th Edition):

Cooke, D. B. (2018). Design and Optimization of a Self-powered Thermoelectric Car Seat Cooler. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/83374

Chicago Manual of Style (16^th Edition):

Cooke, Daniel Benjamin. “Design and Optimization of a Self-powered Thermoelectric Car Seat Cooler.” 2018. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/83374.

MLA Handbook (7^th Edition):

Cooke, Daniel Benjamin. “Design and Optimization of a Self-powered Thermoelectric Car Seat Cooler.” 2018. Web. 27 Feb 2021.

Vancouver:

Cooke DB. Design and Optimization of a Self-powered Thermoelectric Car Seat Cooler. [Internet] [Masters thesis]. Virginia Tech; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/83374.

Council of Science Editors:

Cooke DB. Design and Optimization of a Self-powered Thermoelectric Car Seat Cooler. [Masters Thesis]. Virginia Tech; 2018. Available from: http://hdl.handle.net/10919/83374

Virginia Tech

5. Klein, Jackson Alexander. Energy Harvesting Opportunities Throughout the Nuclear Power Cycle for Self-Powered Wireless Sensor Nodes.

Degree: MS, Mechanical Engineering, 2017, Virginia Tech

URL: http://hdl.handle.net/10919/78031

► Dedicated sensors are widely used throughout many industries to monitor everyday operations, maintain safety, and report performance characteristics. In order to adopt a more sustainable… (more)

Subjects/Keywords: Energy Harvesting; Nuclear Power Plant; Wireless Sensor Node; Electromagnetic Generator; Compliant Mechanism; Thermoelectric Generator; Gamma Radiation; MCNP Simulation; Gamma Heating; Dry Cask Storage

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APA (6^th Edition):

Klein, J. A. (2017). Energy Harvesting Opportunities Throughout the Nuclear Power Cycle for Self-Powered Wireless Sensor Nodes. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/78031

Chicago Manual of Style (16^th Edition):

Klein, Jackson Alexander. “Energy Harvesting Opportunities Throughout the Nuclear Power Cycle for Self-Powered Wireless Sensor Nodes.” 2017. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/78031.

MLA Handbook (7^th Edition):

Klein, Jackson Alexander. “Energy Harvesting Opportunities Throughout the Nuclear Power Cycle for Self-Powered Wireless Sensor Nodes.” 2017. Web. 27 Feb 2021.

Vancouver:

Klein JA. Energy Harvesting Opportunities Throughout the Nuclear Power Cycle for Self-Powered Wireless Sensor Nodes. [Internet] [Masters thesis]. Virginia Tech; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/78031.

Council of Science Editors:

Klein JA. Energy Harvesting Opportunities Throughout the Nuclear Power Cycle for Self-Powered Wireless Sensor Nodes. [Masters Thesis]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/78031

Virginia Tech

6. Norman, Adam Edward. A Fundamental Study of Advance Ratio, Solidity, Turbine Radius, and Blade Profile on the Performance Characteristics of Vertical Axis Turbines (VATs).

Degree: MS, Mechanical Engineering, 2016, Virginia Tech

URL: http://hdl.handle.net/10919/81836

► In this dissertation, various VAT parameters are investigated to determine the effect of the overall efficiency of the turbine at a high Reynolds number. To… (more)

▼ In this dissertation, various VAT parameters are investigated to determine the effect of the overall efficiency of the turbine at a high Reynolds number. To increase the efficiency of the vertical axis turbines, 2D CFD simulations are completed in an effort to better understand the physics behind the operation of these turbines. Specifically, the effect of advance ratio, solidity, and wake interactions were investigated. Simulations were completed in OpenFOAM using the k-ω SST turbulence model at a nominal Reynolds number of 500,000 using a NACA 0015 airfoil. To simulate the motion of the turbine, Arbitrary Mesh Interfacing (AMI) was used. For all of the parameters tested, it was found that the geometric effective angle of attack seen by the turbine blades had a significant impact on the power extracted from the flow. The range of effective angles of attack was found to decrease as the advance ratio increased. In spite of this, a severe loss in the power coefficient occurred at an advance ratio of 2.5 during which the blade experienced dynamic stall. This effect was also seen when the number of turbine blades was changed to four, at a solidity of 1.08. This negative impact on performance was found to be due to the increase in the drag component of the tangential force when dynamic stall occurs. Results indicate that wake interactions between subsequent blades have a large impact on performance especially when the wake interaction alters the flow direction sufficiently to create conditions for dynamic stall. To improve the performance of the VAT in the presence of dynamic stall, calculations were completed of a static twisted blade profile using GenIDLEST and OpenFOAM. There was found to be no improvement in the lift coefficient when comparing the twisted blade profile with a 2D blade at the same median angle of attack as the twisted blade. To further see the effects of the twisted blade, an effective VAT pitching motion was given to the blade and again compared to a 2D blade with the same motion. In this case there was significant improvement seen in the performance of the twisted blade. Advisors/Committee Members: Tafti, Danesh K. (committeechair), Battaglia, Francine (committee member), Zuo, Lei (committee member).

Subjects/Keywords: Computational Fluid Dynamics (CFD); Reynolds Averaged Navier-Stokes (RANS); Large Eddy Simulation (LES) vertical axis turbine; dynamics stall; advance ratio; solidity; wake

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APA (6^th Edition):

Norman, A. E. (2016). A Fundamental Study of Advance Ratio, Solidity, Turbine Radius, and Blade Profile on the Performance Characteristics of Vertical Axis Turbines (VATs). (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/81836

Chicago Manual of Style (16^th Edition):

Norman, Adam Edward. “A Fundamental Study of Advance Ratio, Solidity, Turbine Radius, and Blade Profile on the Performance Characteristics of Vertical Axis Turbines (VATs).” 2016. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/81836.

MLA Handbook (7^th Edition):

Norman, Adam Edward. “A Fundamental Study of Advance Ratio, Solidity, Turbine Radius, and Blade Profile on the Performance Characteristics of Vertical Axis Turbines (VATs).” 2016. Web. 27 Feb 2021.

Vancouver:

Norman AE. A Fundamental Study of Advance Ratio, Solidity, Turbine Radius, and Blade Profile on the Performance Characteristics of Vertical Axis Turbines (VATs). [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/81836.

Council of Science Editors:

Norman AE. A Fundamental Study of Advance Ratio, Solidity, Turbine Radius, and Blade Profile on the Performance Characteristics of Vertical Axis Turbines (VATs). [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/81836

Virginia Tech

7. Xiong, Qiuchi. Control of Vibration Systems with Mechanical Motion Rectifier and their Applications to Vehicle Suspension and Ocean Energy Harvester.

Degree: MS, Mechanical Engineering, 2020, Virginia Tech

URL: http://hdl.handle.net/10919/98004

► Vibration happens in our daily life in almost all cases. It is a regular or irregular back and forth motion of particles. For example, when… (more)

▼ Vibration happens in our daily life in almost all cases. It is a regular or irregular back and forth motion of particles. For example, when we start a vehicle, the engine will do circular motion to drive the wheel, which causes vibration and we feel wave pulses on our body when we sit in the car. However, this kind of vibration is undesirable, since it makes us uncomfortable. The car manufacture designs cushion seats to absorb vibration. This is a way to use hardware to control vibration. However, this is not enough. When vehicle goes through bumps, we do have suspension to absorb vibration transferred from road to our body. The car still experiences a big shock that makes us feel dizzy. On the opposite direction, in some cases when vibration becomes the motion source for energy harvesting, we would like to enhance it. Hardware can be helpful, since by tuning some parameters of an energy harvesting device, it can match with the vibration source to maximize vibration. However, it is still not enough due to low adaptability of a fixed parameter system. To overcome the limitation of hardware, researches begin to think about the way to control vibration, which is the method to change system behavior by using real-time adjustable hardware. By introducing vibration control, the theory behind that started to be investigated. This thesis investigates the vibration control theory application in both cases: vibration reduction and vibration enhancement, which are mentioned above due to opposite application preferences. There are two major applications of vibration control: vehicle suspension control and ocean wave energy converter (WEC) control. The thesis starts from the control development for both fields with general modeling criteria, then followed by control development with specific hardware design-mechanical motion rectifier (MMR) gearbox-applied on both systems. The MMR gearbox is the researcher designed hardware that targets on vibration adjustment with hardware capability, which is similar as the cushion seats mentioned at the beginning of the abstract. However, the MMR cannot have capability to furtherly optimize system vibration, which introduces the necessity of control development based on the existing hardware. In the suspension control application, the control strategy introduced successfully improve the vehicle ride comfort by 29.2%, which means the vehicle body acceleration has been reduced furtherly to let passenger feel less vibration. In the WEC application, the power absorbed from wave has been improved by 57% by applying suitable control strategy. The performance of improvement on vibration control has proved the effect on further vibration optimization beyond hardware limitation. Advisors/Committee Members: Zuo, Lei (committeechair), Southward, Steve C. (committee member), Barry, Oumar (committee member).

Subjects/Keywords: Vibration Reduction; Vibration Amplification; Energy Harvesting; Vehicle Suspension; Ocean Wave Energy Converter

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APA (6^th Edition):

Xiong, Q. (2020). Control of Vibration Systems with Mechanical Motion Rectifier and their Applications to Vehicle Suspension and Ocean Energy Harvester. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/98004

Chicago Manual of Style (16^th Edition):

Xiong, Qiuchi. “Control of Vibration Systems with Mechanical Motion Rectifier and their Applications to Vehicle Suspension and Ocean Energy Harvester.” 2020. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/98004.

MLA Handbook (7^th Edition):

Xiong, Qiuchi. “Control of Vibration Systems with Mechanical Motion Rectifier and their Applications to Vehicle Suspension and Ocean Energy Harvester.” 2020. Web. 27 Feb 2021.

Vancouver:

Xiong Q. Control of Vibration Systems with Mechanical Motion Rectifier and their Applications to Vehicle Suspension and Ocean Energy Harvester. [Internet] [Masters thesis]. Virginia Tech; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/98004.

Council of Science Editors:

Xiong Q. Control of Vibration Systems with Mechanical Motion Rectifier and their Applications to Vehicle Suspension and Ocean Energy Harvester. [Masters Thesis]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/98004

Virginia Tech

8. Wu, You. Multi-source Energy Harvesting for Wildlife Tracking.

Degree: MS, Mechanical Engineering, 2015, Virginia Tech

URL: http://hdl.handle.net/10919/54022

► Sufficient power supply to run GPS machinery and transmit data on a long-term basis remains to be the key challenge for wildlife tracking technology. Traditional… (more)

Subjects/Keywords: Multi-source energy harvester; wildlife tracking; electromagnetic energy harvester; Mechanical Motion Rectifier (MMR); solar energy harvester; Maximum Power Point Tracking (MPPT)

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APA (6^th Edition):

Wu, Y. (2015). Multi-source Energy Harvesting for Wildlife Tracking. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/54022

Chicago Manual of Style (16^th Edition):

Wu, You. “Multi-source Energy Harvesting for Wildlife Tracking.” 2015. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/54022.

MLA Handbook (7^th Edition):

Wu, You. “Multi-source Energy Harvesting for Wildlife Tracking.” 2015. Web. 27 Feb 2021.

Vancouver:

Wu Y. Multi-source Energy Harvesting for Wildlife Tracking. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/54022.

Council of Science Editors:

Wu Y. Multi-source Energy Harvesting for Wildlife Tracking. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/54022

9. Yuan, Yue. Backpack Energy Harvester with Human Walking Model.

Degree: MS, Mechanical Engineering, 2017, Virginia Tech

URL: http://hdl.handle.net/10919/77920

► The objective of this thesis is to design, analyze, and fabricate an innovative backpack energy harvester for human walking. To model human walking with backpack… (more)

Subjects/Keywords: Energy harvesting; Mechanical motion rectifier (MMR); Backpack energy harvester

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APA (6^th Edition):

Yuan, Y. (2017). Backpack Energy Harvester with Human Walking Model. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/77920

Chicago Manual of Style (16^th Edition):

Yuan, Yue. “Backpack Energy Harvester with Human Walking Model.” 2017. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/77920.

MLA Handbook (7^th Edition):

Yuan, Yue. “Backpack Energy Harvester with Human Walking Model.” 2017. Web. 27 Feb 2021.

Vancouver:

Yuan Y. Backpack Energy Harvester with Human Walking Model. [Internet] [Masters thesis]. Virginia Tech; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/77920.

Council of Science Editors:

Yuan Y. Backpack Energy Harvester with Human Walking Model. [Masters Thesis]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/77920

10. Chu, Chiang-Kai. Energy Redistribution with Controllable Binary State Latch Element.

Degree: MS, Mechanical Engineering, 2017, Virginia Tech

URL: http://hdl.handle.net/10919/78336

► An application of binary state latch device with proper real-time control algorithm for energy redistribution application is introduced in this thesis. Unlike traditional tuned vibration… (more)

▼ An application of binary state latch device with proper real-time control algorithm for energy redistribution application is introduced in this thesis. Unlike traditional tuned vibration absorber, the latch device can be viewed as variable semi-active dampers such as magnetorheological (MR) and piezoelectric friction dampers. The distinct difference between other semi-active dampers and our latch device is that other semi-active dampers can provide continuous resistance according to the amount of input current, however, the binary latch device can only provide two different values of resistance - either the maximum or no resistance at all. This property brings the latch possibly having higher maximum and minimum ratio of resistance than MR dampers. As for the operating structure, the mechanism of latch element is nearly the same as the piezoelectric friction dampers which the resistance force is provided according to the normal force acting on two rough plates. Nonetheless, because of the characteristic of the binary states output of the latch element, this make it very different from the ordinary variable dampers. Since it is either being turned on or turned off, a novel control law is required for shifting energy. Also, because of the simplicity of the binary states output, it is very accessible to implement the controller on Field Programmable Gate Array (FPGA). With this accessibility, it is promising to apply plenty of latch elements in the same time for large scale application, such as multi-agent networks. In this thesis, an energy-based analytic solution is proposed to illustrate the universal latch-off condition. And a latch-on condition under ideal situations is discussed. At the end, a control law under nonideal condition is being suggested for real-time periodically excited system. We found that energy redistribution is achievable by using the proper control law under fairly broad conditions. Advisors/Committee Members: Southward, Steve C. (committeechair), Zuo, Lei (committee member), Kurdila, Andrew J. (committee member).

Subjects/Keywords: Energy redistribution; Vibration control; Variable Structure System

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APA (6^th Edition):

Chu, C. (2017). Energy Redistribution with Controllable Binary State Latch Element. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/78336

Chicago Manual of Style (16^th Edition):

Chu, Chiang-Kai. “Energy Redistribution with Controllable Binary State Latch Element.” 2017. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/78336.

MLA Handbook (7^th Edition):

Chu, Chiang-Kai. “Energy Redistribution with Controllable Binary State Latch Element.” 2017. Web. 27 Feb 2021.

Vancouver:

Chu C. Energy Redistribution with Controllable Binary State Latch Element. [Internet] [Masters thesis]. Virginia Tech; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/78336.

Council of Science Editors:

Chu C. Energy Redistribution with Controllable Binary State Latch Element. [Masters Thesis]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/78336

11. Martin, Dillon Minkoff. Hydrodynamic Design Optimization and Wave Tank Testing of Self-Reacting Two-Body Wave Energy Converter.

Degree: MS, Mechanical Engineering, 2017, Virginia Tech

URL: http://hdl.handle.net/10919/80298

► As worldwide energy consumption continues to increase, so does the demand for renewable energy sources. The total available wave energy resource for the United States… (more)

Subjects/Keywords: ocean wave energy harvesting; wave energy converter; point absorber; two-body; hydrodynamics; power optimization; shape optimization

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APA (6^th Edition):

Martin, D. M. (2017). Hydrodynamic Design Optimization and Wave Tank Testing of Self-Reacting Two-Body Wave Energy Converter. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/80298

Chicago Manual of Style (16^th Edition):

Martin, Dillon Minkoff. “Hydrodynamic Design Optimization and Wave Tank Testing of Self-Reacting Two-Body Wave Energy Converter.” 2017. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/80298.

MLA Handbook (7^th Edition):

Martin, Dillon Minkoff. “Hydrodynamic Design Optimization and Wave Tank Testing of Self-Reacting Two-Body Wave Energy Converter.” 2017. Web. 27 Feb 2021.

Vancouver:

Martin DM. Hydrodynamic Design Optimization and Wave Tank Testing of Self-Reacting Two-Body Wave Energy Converter. [Internet] [Masters thesis]. Virginia Tech; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/80298.

Council of Science Editors:

Martin DM. Hydrodynamic Design Optimization and Wave Tank Testing of Self-Reacting Two-Body Wave Energy Converter. [Masters Thesis]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/80298

12. Pei, Yalu. Multi-resonant Electromagnetic Shunt in Base Isolation for Vibration Damping and Energy Harvesting.

Degree: MS, Mechanical Engineering, 2017, Virginia Tech

URL: http://hdl.handle.net/10919/74975

► The objective of this thesis is to develop a dual-functional approach to effectively mitigate the earthquake induced vibrations of low- or mid-rise buildings, and at… (more)

▼ The objective of this thesis is to develop a dual-functional approach to effectively mitigate the earthquake induced vibrations of low- or mid-rise buildings, and at the same time to efficiently harvest utility-scale energy by using an optimally configured multi-resonant electromagnetic shunt in base isolation. In this research, two multi-resonant shunt configurations, parallel and series, were proposed and optimized based on the H2 criteria when the base isolation system is subjected to ground acceleration excitations. The performance of the proposed multi-resonant electromagnetic shunt was compared with traditional multiple tuned mass dampers (TMDs) applied to the base isolation system. It shows that, for multiple TMDs and multi-resonant electromagnetic shunt dampers with 5% total stiffness ratio, the parallel shunt electromagnetic shunt can achieve the best vibration mitigation performance among other types of multi-resonant dampers, including parallel TMDs, series TMDs and the series electromagnetic shunt damper. Case study of a base-isolated structure was analyzed to investigate the effectiveness of the proposed multi-resonant electromagnetic shunt. It shows that both multi-mode shunt circuits outperform single mode shunt circuit by suppressing the primary and the second vibration modes simultaneously. Comparatively, the parallel shunt circuit is more effective in vibration mitigation and energy harvesting, and is also more robust in parameter mistuning than the series shunt circuit. The time history response analysis shows that, under the recorded Northridge earthquake, the instant peak power and total average power capable to be harvested by the multi-resonant shunt can reach up to 1.18 MW and 203.37KW, respectively. This thesis further experimentally validated the effectiveness of the multi-resonant electromagnetic shunt on a scaled-down base-isolated building. The impact hammer test shows that the multi-resonant electromagnetic shunt can achieve enhanced vibration suppression by reducing the first resonant peak by 27.50dB and the second resonant peak by 22.57dB regarding the primary structure acceleration. The shake table test shows that under scaled Kobe and Northridge earthquake signals, the electromagnetic shunt can effectively reduce the vibration resonant peak value by 38.92% and 66.61%, respectively. The voltage simultaneously generated in the multi-mode shunt circuit was also obtained, which demonstrated the dual functions of the multi-resonant electromagnetic shunt in base isolation. Advisors/Committee Members: Zuo, Lei (committeechair), Hajj, Muhammad R. (committee member), Priya, Shashank (committee member).

Subjects/Keywords: Base isolation; Vibration damping; Energy harvesting; Electromagnetic shunt; Multi-mode resonant circuits

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APA (6^th Edition):

Pei, Y. (2017). Multi-resonant Electromagnetic Shunt in Base Isolation for Vibration Damping and Energy Harvesting. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/74975

Chicago Manual of Style (16^th Edition):

Pei, Yalu. “Multi-resonant Electromagnetic Shunt in Base Isolation for Vibration Damping and Energy Harvesting.” 2017. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/74975.

MLA Handbook (7^th Edition):

Pei, Yalu. “Multi-resonant Electromagnetic Shunt in Base Isolation for Vibration Damping and Energy Harvesting.” 2017. Web. 27 Feb 2021.

Vancouver:

Pei Y. Multi-resonant Electromagnetic Shunt in Base Isolation for Vibration Damping and Energy Harvesting. [Internet] [Masters thesis]. Virginia Tech; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/74975.

Council of Science Editors:

Pei Y. Multi-resonant Electromagnetic Shunt in Base Isolation for Vibration Damping and Energy Harvesting. [Masters Thesis]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/74975

13. Racioppo, Peter Charles. Design and Control of a Cable-Driven Articulated Modular Snake Robot.

Degree: M. S., Mechanical Engineering, 2018, Virginia Tech

URL: http://hdl.handle.net/10919/91983

► This thesis presents the design and control of a cable-actuated mobile snake robot. The goal of this research is to reduce the size of snake… (more)

Subjects/Keywords: robot dynamics; mobile robots; force control; modeling

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APA (6^th Edition):

Racioppo, P. C. (2018). Design and Control of a Cable-Driven Articulated Modular Snake Robot. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/91983

Chicago Manual of Style (16^th Edition):

Racioppo, Peter Charles. “Design and Control of a Cable-Driven Articulated Modular Snake Robot.” 2018. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/91983.

MLA Handbook (7^th Edition):

Racioppo, Peter Charles. “Design and Control of a Cable-Driven Articulated Modular Snake Robot.” 2018. Web. 27 Feb 2021.

Vancouver:

Racioppo PC. Design and Control of a Cable-Driven Articulated Modular Snake Robot. [Internet] [Masters thesis]. Virginia Tech; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/91983.

Council of Science Editors:

Racioppo PC. Design and Control of a Cable-Driven Articulated Modular Snake Robot. [Masters Thesis]. Virginia Tech; 2018. Available from: http://hdl.handle.net/10919/91983

14. Wang, Dong. Image-based Vehicle Localization.

Degree: MS, Computer Engineering, 2019, Virginia Tech

URL: http://hdl.handle.net/10919/90795

► In modern days, global positioning system (GPS) is the major approach to locate positions. However, GPS is not as reliable as we thought. Under some… (more)

Subjects/Keywords: image-based; vehicle localization; text landmark

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APA (6^th Edition):

Wang, D. (2019). Image-based Vehicle Localization. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/90795

Chicago Manual of Style (16^th Edition):

Wang, Dong. “Image-based Vehicle Localization.” 2019. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/90795.

MLA Handbook (7^th Edition):

Wang, Dong. “Image-based Vehicle Localization.” 2019. Web. 27 Feb 2021.

Vancouver:

Wang D. Image-based Vehicle Localization. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/90795.

Council of Science Editors:

Wang D. Image-based Vehicle Localization. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/90795

Virginia Tech

15. Li, Xiaofan. Design, Analysis and Testing of a Self-reactive Wave Energy Point Absorber with Mechanical Power Take-off.

Degree: PhD, Mechanical Engineering, 2020, Virginia Tech

URL: http://hdl.handle.net/10919/100800

► Ocean wave as a renewable energy source possesses great potential for solving the world energy crisis and benefit human beings. The total theoretical potential wave… (more)

▼ Ocean wave as a renewable energy source possesses great potential for solving the world energy crisis and benefit human beings. The total theoretical potential wave power on the ocean-facing coastlines of the world is around 30,000 TWh, although impossible to be all transferred into electricity, the amount of the power can be absorbed still can cover a large portion of the world's total energy consumption. However, multiple reasons have stopped the ocean wave energy from being widely adopted, and among those reasons, the most important one is immature of the Power Take-off (PTO) technology. In this dissertation, a novel two body wave energy converter with a PTO using the unique mechanism of Mechanical Motion Rectifier (MMR) is investigated through design, analysis, and testing. To improve the energy harvesting efficiency and the reliability of the PTO, the dissertation induced a mechanical PTO that uses MMR mechanism which can transfer the reciprocated bi-directional movement of the ocean wave into unidirectional rotation of the generator. This mechanism brings in a unique phenomenon of engagement and disengagement and a piecewise nonlinear dynamic property into the PTO. Through a comprehensive study, the MMR PTO is further characterized and a refined dynamic model that can accurately predict the dynamic response of the PTO is established. The major factors that can influence the performance of the MMR PTO are explored and discussed both analytically and experimentally. Moreover, as it has been theoretically hypothesis that using a two-body structure for designing the point absorbers can help it to achieve a frequency tuning effect for it to better match with the excitation frequency of the ocean wave, it lacks experimental verification. In this dissertation, a scaled two-body point absorber prototype is developed and put into a wave tank to compare with the single body structure. The test results show that through the use of two-body structure and by designing the mass ratio between the two bodies properly, the point absorber can successfully match the excitation frequency of the wave. The highest power capture width ratio (CWR) achieved during the test is 58.7%, which exceeds the results of similar prototypes, proving the advantage of the proposed design. Advisors/Committee Members: Zuo, Lei (committeechair), Parker, Robert G. (committee member), Ngo, Khai D. (committee member), Tafti, Danesh K. (committee member), Yu, Yi Hsiang (committee member).

Subjects/Keywords: Ocean wave energy harvesting; Point absorber; Bench test; Wave tank test; Power optimization

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APA (6^th Edition):

Li, X. (2020). Design, Analysis and Testing of a Self-reactive Wave Energy Point Absorber with Mechanical Power Take-off. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/100800

Chicago Manual of Style (16^th Edition):

Li, Xiaofan. “Design, Analysis and Testing of a Self-reactive Wave Energy Point Absorber with Mechanical Power Take-off.” 2020. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/100800.

MLA Handbook (7^th Edition):

Li, Xiaofan. “Design, Analysis and Testing of a Self-reactive Wave Energy Point Absorber with Mechanical Power Take-off.” 2020. Web. 27 Feb 2021.

Vancouver:

Li X. Design, Analysis and Testing of a Self-reactive Wave Energy Point Absorber with Mechanical Power Take-off. [Internet] [Doctoral dissertation]. Virginia Tech; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/100800.

Council of Science Editors:

Li X. Design, Analysis and Testing of a Self-reactive Wave Energy Point Absorber with Mechanical Power Take-off. [Doctoral Dissertation]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/100800

Virginia Tech

16. Rahman, Imran. Electrical Load Disaggregation and Demand Response in Commercial Buildings.

Degree: PhD, Electrical Engineering, 2020, Virginia Tech

URL: http://hdl.handle.net/10919/96602

► Electrical power systems consist of a large number of power generators connected to consumers through a complex system of transmission and distribution lines. Within the… (more)

Subjects/Keywords: Load Disaggregation; Demand Response; Double-Auction; Bid Price; Load Scheduler; Load Priorities; User Preferences

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APA (6^th Edition):

Rahman, I. (2020). Electrical Load Disaggregation and Demand Response in Commercial Buildings. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/96602

Chicago Manual of Style (16^th Edition):

Rahman, Imran. “Electrical Load Disaggregation and Demand Response in Commercial Buildings.” 2020. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/96602.

MLA Handbook (7^th Edition):

Rahman, Imran. “Electrical Load Disaggregation and Demand Response in Commercial Buildings.” 2020. Web. 27 Feb 2021.

Vancouver:

Rahman I. Electrical Load Disaggregation and Demand Response in Commercial Buildings. [Internet] [Doctoral dissertation]. Virginia Tech; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/96602.

Council of Science Editors:

Rahman I. Electrical Load Disaggregation and Demand Response in Commercial Buildings. [Doctoral Dissertation]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/96602

Virginia Tech

17. Liu, Yilun. Design, Modeling and Control of Vibration Systems with Electromagnetic Energy Harvesters and their Application to Vehicle Suspensions.

Degree: PhD, Mechanical Engineering, 2016, Virginia Tech

URL: http://hdl.handle.net/10919/73387

► Instead of dissipating vibration energy into heat waste via viscous damping elements, this dissertation proposes an innovative vibration control method which can simultaneously mitigate vibration… (more)

▼ Instead of dissipating vibration energy into heat waste via viscous damping elements, this dissertation proposes an innovative vibration control method which can simultaneously mitigate vibration and harvest the associated vibration energy using electromagnetic energy harvesters. This dissertation shows that the electromagnetic energy harvester can work as a controllable damper as well as an energy harvester. The semi-active control of a linear electromagnetic energy harvester, for improvement of suspension performance, has been experimentally implemented in a scaled-down quarter-car suspension system. While improving performance, power produced by the harvester can be harvested through energy harvesting circuits. This dissertation also proposes a mechanical-motion-rectifier(MMR)-based electromagnetic energy harvester using a ball-screw mechanism and two one-way clutches for the application of replacing the viscous damper in vehicle suspensions. Compared to commercial linear harvesters, the proposed design is able to provide large damping forces and increase power-dissipation density, making it suitable to vehicle suspensions. In addition, the proposed MMR-based harvester can convert reciprocating vibration into unidirectional rotation of the generator. This feature significantly increases energy-harvesting efficiency by enabling the generator to rotate at a relatively steady speed during irregular vibrations and improves the system reliability by reducing impact forces among transmission gears. Extensive theoretical and experimental analysis have been conducted to characterize the proposed MMR-based energy harvester. The coupled dynamics of the suspension system with the MMR-based energy harvester are also explored and optimized. Furthermore, a new control algorithm is proposed to control the MMR-based energy harvester considering its unique dynamics induced by the one-way clutches. The results show that the controlled proposed electromagnetic energy harvester can possibly improve ride comfort of vehicles over conventional oil dampers and simultaneously harvest the associated vibration energy. Advisors/Committee Members: Zuo, Lei (committeechair), Ngo, Khai D. (committee member), Sandu, Corina (committee member), Parker, Robert G. (committee member), Ferris, John B. (committee member).

Subjects/Keywords: Vibration control; Semi-active suspension control; Energy harvesting; Electromagnetic damper; Mechanical motion rectifier

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APA (6^th Edition):

Liu, Y. (2016). Design, Modeling and Control of Vibration Systems with Electromagnetic Energy Harvesters and their Application to Vehicle Suspensions. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/73387

Chicago Manual of Style (16^th Edition):

Liu, Yilun. “Design, Modeling and Control of Vibration Systems with Electromagnetic Energy Harvesters and their Application to Vehicle Suspensions.” 2016. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/73387.

MLA Handbook (7^th Edition):

Liu, Yilun. “Design, Modeling and Control of Vibration Systems with Electromagnetic Energy Harvesters and their Application to Vehicle Suspensions.” 2016. Web. 27 Feb 2021.

Vancouver:

Liu Y. Design, Modeling and Control of Vibration Systems with Electromagnetic Energy Harvesters and their Application to Vehicle Suspensions. [Internet] [Doctoral dissertation]. Virginia Tech; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/73387.

Council of Science Editors:

Liu Y. Design, Modeling and Control of Vibration Systems with Electromagnetic Energy Harvesters and their Application to Vehicle Suspensions. [Doctoral Dissertation]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/73387

Virginia Tech

18. Mao, Yincan. Passive Balancing of Switching Transients between Paralleled SiC MOSFETs.

Degree: PhD, Electrical Engineering, 2018, Virginia Tech

URL: http://hdl.handle.net/10919/82203

► The SiC MOSFET has attracted interest due to its superior characteristics compared to its Si counterpart. Several SiC MOSFETs are usually paralleled to increase current… (more)

▼ The SiC MOSFET has attracted interest due to its superior characteristics compared to its Si counterpart. Several SiC MOSFETs are usually paralleled to increase current capability, considering cost effectiveness and manufacturability. Current unbalance among the MOSFETs is a concern as it affects reliability. The two main causes are asymmetrical layout and parameter mismatch. The variation in parameters, unlike circuit or module layout, is unavoidable during production. Among all the parameters of MOSFET, the spreads in on-state resistance (Rds(on)) and threshold voltage (Vth) are the major concerns during paralleling. The disparity in Rds(on) causes static current unbalance which is self-limited due to the positive temperature coefficient of Rds(on). Its influence is not investigated here. The threshold voltage Vth has a negative temperature coefficient, forcing the MOSFET with lower Vth to carry more current during switching transient. Paralleled MOSFETs are usually de-rated to guarantee safe operation. Balancing of peak currents during switching transient isthe goal of this work. Integration of current/voltage sensors into paralleled structure is difficult in real application. Complicated feedback loop design and separate gate drivers also need to be avoided in perspective of cost and volume. Passive balancing solutions are investigated in this dissertation. The inductors and resistors most effective in improving current sharing are identified by parametric analysis. Their current balancing mechanisms are analyzed in circuit point of view. The design guidelines involving the magnitude of Vth mismatch, current rise time, and unbalance percentage are derived for the selection of passive components. The theory upholds well when substantial parasitics from device package and layout exist. Several passive balancing structures are analyzed and compared in terms of current balancing capability, voltage stress, total switching loss, and switching loss difference. All of them can provide much better current and power balancing without increasing switching loss. Some of the them may increase the stress-inducing inductance, which can be reduced by negative magnetic coupling. Perfect coupling between power-source inductors would enable current matching without penalty on voltage stress. Common-source inductance (Lcm) is effective in dynamic balancing, but at the expense of higher switching loss. It is not considered in power module application because Kelvin connection is normally applied. However, wire bond inside the package of discrete MOSFETs and part of the external leads are inevitable and add to Lcm. Peak-current and switching energy mismatches vary with operating conditions (including input voltage, input current, and switching speed). Design guidelines and procedures that are valid for wide operating range are provided for cases with and without Lcm. This dissertation also models the switching energy and switching energy mismatch of paralleled MOSFETs. The influence of operating conditions, passive balancing… Advisors/Committee Members: Ngo, Khai D. T. (committeechair), Lu, Guo Quan (committee member), Ha, Dong S. (committee member), Zuo, Lei (committee member), Burgos, Rolando (committee member).

Subjects/Keywords: paralleled SiC MOSFETs; dynamic balancing; passive compensation; magnetic coupling; modeling

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APA (6^th Edition):

Mao, Y. (2018). Passive Balancing of Switching Transients between Paralleled SiC MOSFETs. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/82203

Chicago Manual of Style (16^th Edition):

Mao, Yincan. “Passive Balancing of Switching Transients between Paralleled SiC MOSFETs.” 2018. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/82203.

MLA Handbook (7^th Edition):

Mao, Yincan. “Passive Balancing of Switching Transients between Paralleled SiC MOSFETs.” 2018. Web. 27 Feb 2021.

Vancouver:

Mao Y. Passive Balancing of Switching Transients between Paralleled SiC MOSFETs. [Internet] [Doctoral dissertation]. Virginia Tech; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/82203.

Council of Science Editors:

Mao Y. Passive Balancing of Switching Transients between Paralleled SiC MOSFETs. [Doctoral Dissertation]. Virginia Tech; 2018. Available from: http://hdl.handle.net/10919/82203

Virginia Tech

19. Yu, Shifeng. The Development of High-Throughput and Miniaturized Differential Scanning Calorimeter for Thermodynamic Study of Bio-Molecules.

Degree: PhD, Mechanical Engineering, 2019, Virginia Tech

URL: http://hdl.handle.net/10919/87777

► Virtually all biological phenomena depend on molecular interactions, which is either intra-molecular as protein folding/unfolding or intermolecular as in ligand binding. A basic biology problem… (more)

Subjects/Keywords: MEMS; Differential Scanning Calorimeter; Thermodynamic; Protein Stability; Transition Temperature

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APA (6^th Edition):

Yu, S. (2019). The Development of High-Throughput and Miniaturized Differential Scanning Calorimeter for Thermodynamic Study of Bio-Molecules. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/87777

Chicago Manual of Style (16^th Edition):

Yu, Shifeng. “The Development of High-Throughput and Miniaturized Differential Scanning Calorimeter for Thermodynamic Study of Bio-Molecules.” 2019. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/87777.

MLA Handbook (7^th Edition):

Yu, Shifeng. “The Development of High-Throughput and Miniaturized Differential Scanning Calorimeter for Thermodynamic Study of Bio-Molecules.” 2019. Web. 27 Feb 2021.

Vancouver:

Yu S. The Development of High-Throughput and Miniaturized Differential Scanning Calorimeter for Thermodynamic Study of Bio-Molecules. [Internet] [Doctoral dissertation]. Virginia Tech; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/87777.

Council of Science Editors:

Yu S. The Development of High-Throughput and Miniaturized Differential Scanning Calorimeter for Thermodynamic Study of Bio-Molecules. [Doctoral Dissertation]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/87777

Virginia Tech

20. Dai, Xiang. Nonlinear Dynamics and Vibration of Gear and Bearing Systems using A Finite Element/Contact Mechanics Model and A Hybrid Analytical-Computational Model.

Degree: PhD, Mechanical Engineering, 2017, Virginia Tech

URL: http://hdl.handle.net/10919/78861

► This work investigates the dynamics and vibration in gear systems, including spur and helical gear pairs, idler gear trains, and planetary gears. The spur gear… (more)

▼ This work investigates the dynamics and vibration in gear systems, including spur and helical gear pairs, idler gear trains, and planetary gears. The spur gear pairs are analyzed using a finite element/contact mechanics (FE/CM) model. A hybrid analytical-computational (HAC) model is proposed for nonlinear gear dynamics. The HAC predictions are compared with FE/CM results and available experimental data for validation. Chapter ref{{CH:GP_Strain}} investigates the static and dynamic tooth root strains in spur gear pairs using a finite element/contact mechanics approach. Extensive comparisons with experiments, including those from the literature and new ones, confirm that the finite element/contact mechanics formulation accurately predicts the tooth root strains. The model is then used to investigate the features of the tooth root strain curves as the gears rotate kinematically and the tooth contact conditions change. Tooth profile modifications are shown to strongly affect the shape of the strain curve. The effects of strain gage location on the shape of the static strain curves are investigated. At non-resonant speeds the dynamic tooth root strain curves have similar shapes as the static strain curves. At resonant speeds, however, the dynamic tooth root strain curves are drastically different because large amplitude vibration causes tooth contact loss. There are three types of contact loss nonlinearities: incomplete tooth contact, total contact loss, and tooth skipping, and each of these has a unique strain curve. Results show that different operating speeds with the same dynamic transmission error can have much different dynamic tooth strain. Chapters ref{{CH:HAC_2DSingle}}, ref{{CH:HAC_2DMultiple}}, and ref{{CH:HAC_3DSingle}} develops a hybrid-analytical-computational (HAC) method for nonlinear dynamic response in gear systems. Chapter ref{{CH:HAC_2DSingle}} describes the basic assumptions and procedures of the method, and implemented the method on two-dimensional vibrations in spur gear pairs. Chapters ref{{CH:HAC_2DMultiple}} and ref{{CH:HAC_3DSingle}} extends the method to two-dimensional multi-mesh systems and three-dimensional single-mesh systems. Chapter ref{{CH:HAC_2DSingle}} develops a hybrid analytical-computational (HAC) model for nonlinear dynamic response in spur gear pairs. The HAC model is based on an underlying finite element code. The gear translational and rotational vibrations are calculated analytically using a lumped parameter model, while the crucial dynamic mesh force is calculated using a force-deflection function that is generated from a series of static finite element analyses before the dynamic calculations. Incomplete tooth contact and partial contact loss are captured by the static finite element analyses, and included in the force-deflection function. Elastic deformations of the gear teeth, including the tooth root strains and contact stresses, are calculated. Extensive comparisons with finite element calculations and available experiments validate the HAC model in predicting… Advisors/Committee Members: Parker, Robert G. (committeechair), Sandu, Corina (committee member), Cooley, Christopher G. (committee member), Zuo, Lei (committee member).

Subjects/Keywords: Gears; Bearings; Nonlinear Dynamics; Efficient; Accurate

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APA (6^th Edition):

Dai, X. (2017). Nonlinear Dynamics and Vibration of Gear and Bearing Systems using A Finite Element/Contact Mechanics Model and A Hybrid Analytical-Computational Model. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/78861

Chicago Manual of Style (16^th Edition):

Dai, Xiang. “Nonlinear Dynamics and Vibration of Gear and Bearing Systems using A Finite Element/Contact Mechanics Model and A Hybrid Analytical-Computational Model.” 2017. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/78861.

MLA Handbook (7^th Edition):

Dai, Xiang. “Nonlinear Dynamics and Vibration of Gear and Bearing Systems using A Finite Element/Contact Mechanics Model and A Hybrid Analytical-Computational Model.” 2017. Web. 27 Feb 2021.

Vancouver:

Dai X. Nonlinear Dynamics and Vibration of Gear and Bearing Systems using A Finite Element/Contact Mechanics Model and A Hybrid Analytical-Computational Model. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/78861.

Council of Science Editors:

Dai X. Nonlinear Dynamics and Vibration of Gear and Bearing Systems using A Finite Element/Contact Mechanics Model and A Hybrid Analytical-Computational Model. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/78861

21. Wu, Yongjia. Thermoelectric Energy Harvesting for Sensor Powering.

Degree: PhD, Mechanical Engineering, 2019, Virginia Tech

URL: http://hdl.handle.net/10919/90891

► The dissertation addressed some critical issues in thermoelectric energy harvesting and broadened its application for energy recovery and sensor powering. Some of the most advanced… (more)

▼ The dissertation addressed some critical issues in thermoelectric energy harvesting and broadened its application for energy recovery and sensor powering. Some of the most advanced technologies were developed to improve the energy conversion efficiency and reliability of the thermoelectric energy harvesters. In this dissertation, a general and comprehensive thermodynamic model for a commercial thermoelectric generator (TEG) was established. The model can be used to optimize the design of the existing commercial TEG modules. High performance heat sink design was critical to maximize the temperature drop in the TEG module, thus increase the power output and energy conversion efficiency of the TEG. An innovative heat sink design integrated with self-oscillating impinging jet generated by the fluidic oscillator arrays were designed to cool the cold end of the TEG, thus enhance the performance of the TEG. The performance of the heat sink was characterized by large eddy simulation. A single thermoelectric material only had high thermoelectric performance in a narrow temperature range. A segmented TEG could achieve a high energy conversion efficiency over a wide temperature range by adopting different materials which had high thermoelectric performance at low, moderate, and hight temperature ranges. However, the material compatibility mismatch had been a practical problem that hindered the further improvement of energy conversion efficiency of the segmented TEG. In this dissertation, a novel method was developed to eliminate the compatibility mismatch problem via optimizing the geometry of the thermo-elements. A segmented TEG with an unprecedented efficiency of 23.72% was constructed using the method proposed in this dissertation. The complex geometry structure of the established thermo-elements would introduce extra difficulty in fabrication. Thus selective laser melting, a high-temperature additive manufacture method, was proposed for the fabrication. A physical model based on the v conservation equations was built to guide the selective-laser-melting manufacturing of the optimized segmented TEG mentioned above. In this dissertation, two thermoelectric energy harvesters were built for self-powered sensors to in-situ monitor the interior conditions in nuclear canisters. The sensors, taking advantage of the thermal energy existing in the local environment, can work continuously and provide tremendous data for system monitor and diagnosis without external energy supply. Also, a compact thermoelectric energy harvester was developed to power the gas sensor for combustion monitoring and control. Advisors/Committee Members: Zuo, Lei (committeechair), Diller, Thomas E. (committee member), Heibel, Michael David (committee member), Qiao, Rui (committee member).

Subjects/Keywords: Thermoelectric; energy harvesting; heat transfer; sensor powering

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APA (6^th Edition):

Wu, Y. (2019). Thermoelectric Energy Harvesting for Sensor Powering. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/90891

Chicago Manual of Style (16^th Edition):

Wu, Yongjia. “Thermoelectric Energy Harvesting for Sensor Powering.” 2019. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/90891.

MLA Handbook (7^th Edition):

Wu, Yongjia. “Thermoelectric Energy Harvesting for Sensor Powering.” 2019. Web. 27 Feb 2021.

Vancouver:

Wu Y. Thermoelectric Energy Harvesting for Sensor Powering. [Internet] [Doctoral dissertation]. Virginia Tech; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/90891.

Council of Science Editors:

Wu Y. Thermoelectric Energy Harvesting for Sensor Powering. [Doctoral Dissertation]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/90891

Virginia Tech

22. Qian, Feng. Piezoelectric Energy Harvesting for Powering Wireless Monitoring Systems.

Degree: PhD, Mechanical Engineering, 2020, Virginia Tech

URL: http://hdl.handle.net/10919/99156

► Wireless monitoring systems with embedded wireless sensor nodes have been widely applied in human health care, structural health monitoring, home security, environment assessment, and wild… (more)

▼ Wireless monitoring systems with embedded wireless sensor nodes have been widely applied in human health care, structural health monitoring, home security, environment assessment, and wild animal tracking. One distinctive advantage of wireless monitoring systems is to provide unremitting, wireless monitoring of interesting parameters, and data transmission for timely decision making. However, most of these systems are powered by traditional batteries with finite energy capacity, which need periodic replacement or recharge, resulting in high maintenance costs, interruption of service, and potential environmental pollution. On the other hand, abundant energy in different forms such as solar, wind, heat, and vibrations, diffusely exists in ambient environments surrounding wireless monitoring systems which would be otherwise wasted could be converted into usable electricity by proper energy transduction mechanisms. Energy harvesting, also referred to as energy scavenging and energy conversion, is a technology that uses different energy transduction mechanisms, including electromagnetic, photovoltaic, piezoelectric, electrostatic, triboelectric, and thermoelectric, to convert ambient energy into electricity. Compared with traditional batteries, energy harvesting could provide a continuous and sustainable power supply or directly recharge storage devices like batteries and capacitors without interrupting operation. Among these energy transduction mechanisms, piezoelectric materials have been extensively explored for small-size and low-power generation due to their merits of easy shaping, high energy density, flexible design, and low maintenance cost. Piezoelectric transducers convert mechanical energy induced by dynamic strain into electrical charges through the piezoelectric effect. This dissertation presents novel piezoelectric energy harvesters, including design, modeling, prototyping, and experimental tests for energy harvesting from human walking, broadband bi-stable nonlinear vibrations, and torsional vibrations for powering wireless monitoring systems. A piezoelectric footwear energy harvester is developed and embedded inside a shoe heel for scavenging energy from heel striking during human walking to provide a power supply for wearable sensors embedded in health monitoring systems. The footwear energy harvester consists of multiple piezoelectric stacks, force amplifiers, and two heel-shaped metal plates taking dynamic forces at the heel. The force amplifiers are designed and optimized to redirect and amplify the dynamic force transferred from the heel-shaped plates and then applied to the inner piezoelectric stacks for large power output. An analytical model and a finite model were developed to simulate the electromechanical responses of the harvester. The footwear harvester was tested on a treadmill under different walking speeds to validate the numerical models and evaluate the energy generation performance. An average power output of 9.3 mW/shoe and a peak power output of 84.8 mW are experimentally… Advisors/Committee Members: Zuo, Lei (committeechair), Hajj, Muhammad R. (committee member), Abaid, Nicole (committee member), Parker, Robert G. (committee member).

Subjects/Keywords: Energy harvesting; Wireless monitoring; Piezoelectric; Human walking; Torsional vibration; Bio-inspired design; Bi-stable nonlinear vibration

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APA (6^th Edition):

Qian, F. (2020). Piezoelectric Energy Harvesting for Powering Wireless Monitoring Systems. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/99156

Chicago Manual of Style (16^th Edition):

Qian, Feng. “Piezoelectric Energy Harvesting for Powering Wireless Monitoring Systems.” 2020. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/99156.

MLA Handbook (7^th Edition):

Qian, Feng. “Piezoelectric Energy Harvesting for Powering Wireless Monitoring Systems.” 2020. Web. 27 Feb 2021.

Vancouver:

Qian F. Piezoelectric Energy Harvesting for Powering Wireless Monitoring Systems. [Internet] [Doctoral dissertation]. Virginia Tech; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/99156.

Council of Science Editors:

Qian F. Piezoelectric Energy Harvesting for Powering Wireless Monitoring Systems. [Doctoral Dissertation]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/99156

Virginia Tech

23. Kim, Hongjip. Enhanced Energy Harvesting for Rotating Systems using Stochastic Resonance.

Degree: PhD, Mechanical Engineering, 2020, Virginia Tech

URL: http://hdl.handle.net/10919/96728

► In this dissertation, a novel energy harvesting strategy for rotating systems was proposed by taking advantage of stochastic resonance. Stochastic resonance is referred to as… (more)

Subjects/Keywords: Energy Harvesting; Rotating Systems; Stochastic Resonance; Self-tuning; FPK equation; Potential asymmetry; Weak periodic potential

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APA (6^th Edition):

Kim, H. (2020). Enhanced Energy Harvesting for Rotating Systems using Stochastic Resonance. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/96728

Chicago Manual of Style (16^th Edition):

Kim, Hongjip. “Enhanced Energy Harvesting for Rotating Systems using Stochastic Resonance.” 2020. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/96728.

MLA Handbook (7^th Edition):

Kim, Hongjip. “Enhanced Energy Harvesting for Rotating Systems using Stochastic Resonance.” 2020. Web. 27 Feb 2021.

Vancouver:

Kim H. Enhanced Energy Harvesting for Rotating Systems using Stochastic Resonance. [Internet] [Doctoral dissertation]. Virginia Tech; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/96728.

Council of Science Editors:

Kim H. Enhanced Energy Harvesting for Rotating Systems using Stochastic Resonance. [Doctoral Dissertation]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/96728

24. Xing, Shaoxu. Design of Power Converter and Wireless Data Acquisition System for TEG Energy Harvester.

Degree: MS, Mechanical Engineering, 2016, Virginia Tech

URL: http://hdl.handle.net/10919/73361

► In order to avoid the accidents like Fukushima Disaster and monitor the operation status of nuclear power plant, a wireless sensor system which is powered… (more)

Subjects/Keywords: Energy Harvester; Power Converter; Data Acquisition; Wireless Communication; MPPT; Sensor

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APA (6^th Edition):

Xing, S. (2016). Design of Power Converter and Wireless Data Acquisition System for TEG Energy Harvester. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/73361

Chicago Manual of Style (16^th Edition):

Xing, Shaoxu. “Design of Power Converter and Wireless Data Acquisition System for TEG Energy Harvester.” 2016. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/73361.

MLA Handbook (7^th Edition):

Xing, Shaoxu. “Design of Power Converter and Wireless Data Acquisition System for TEG Energy Harvester.” 2016. Web. 27 Feb 2021.

Vancouver:

Xing S. Design of Power Converter and Wireless Data Acquisition System for TEG Energy Harvester. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/73361.

Council of Science Editors:

Xing S. Design of Power Converter and Wireless Data Acquisition System for TEG Energy Harvester. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/73361

25. Chen, Jie. Design and analysis of a thermoelectric energy harvesting system for powering sensing nodes in nuclear power plant.

Degree: MS, Mechanical Engineering, 2016, Virginia Tech

URL: http://hdl.handle.net/10919/64792

► In this work, a thermoelectric energy harvester system aimed at harvesting energy for locally powering sensor nodes in nuclear power plant coolant loops has been… (more)

Subjects/Keywords: thermoelectric generator; nuclear power plant monitoring; modeling; optimization

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

APA (6^th Edition):

Chen, J. (2016). Design and analysis of a thermoelectric energy harvesting system for powering sensing nodes in nuclear power plant. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/64792

Chicago Manual of Style (16^th Edition):

Chen, Jie. “Design and analysis of a thermoelectric energy harvesting system for powering sensing nodes in nuclear power plant.” 2016. Masters Thesis, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/64792.

MLA Handbook (7^th Edition):

Chen, Jie. “Design and analysis of a thermoelectric energy harvesting system for powering sensing nodes in nuclear power plant.” 2016. Web. 27 Feb 2021.

Vancouver:

Chen J. Design and analysis of a thermoelectric energy harvesting system for powering sensing nodes in nuclear power plant. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/64792.

Council of Science Editors:

Chen J. Design and analysis of a thermoelectric energy harvesting system for powering sensing nodes in nuclear power plant. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/64792

Virginia Tech

26. Liu, Mingyi. Energy Harvesting from the Human Body for Wearable and Mobile Devices.

Degree: PhD, Mechanical Engineering, 2020, Virginia Tech

URL: http://hdl.handle.net/10919/99305

► Wearable and mobile devices are an important part of our daily life. Most of those devices are powered by batteries. The limited life span of… (more)

Subjects/Keywords: energy harvesting; human body; backpack; negative muscle work; ankle energy harvester; energy harvesting tile/paver

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

APA (6^th Edition):

Liu, M. (2020). Energy Harvesting from the Human Body for Wearable and Mobile Devices. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/99305

Chicago Manual of Style (16^th Edition):

Liu, Mingyi. “Energy Harvesting from the Human Body for Wearable and Mobile Devices.” 2020. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/99305.

MLA Handbook (7^th Edition):

Liu, Mingyi. “Energy Harvesting from the Human Body for Wearable and Mobile Devices.” 2020. Web. 27 Feb 2021.

Vancouver:

Liu M. Energy Harvesting from the Human Body for Wearable and Mobile Devices. [Internet] [Doctoral dissertation]. Virginia Tech; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/99305.

Council of Science Editors:

Liu M. Energy Harvesting from the Human Body for Wearable and Mobile Devices. [Doctoral Dissertation]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/99305

27. Lu, Ming. Synergetic Attenuation of Stray Magnetic Field in Inductive Power Transfer.

Degree: PhD, Electrical Engineering, 2017, Virginia Tech

URL: http://hdl.handle.net/10919/78621

► Significant stray magnetic field exists around the coils when charging the electric vehicles (EVs) with inductive power transfer (IPT), owning to the large air gap… (more)

▼ Significant stray magnetic field exists around the coils when charging the electric vehicles (EVs) with inductive power transfer (IPT), owning to the large air gap between the transmitter and receiver. The methods for field attenuation usually introduce extra losses and reduce the efficiency. This study focuses on the synergetic attenuation of stray magnetic field which is optimized simultaneously with the efficiency. The optimization is realized with Pareto front. In this dissertation, three methods are discussed for the field attenuation. The first method is to tune the physical parameters of the winding, such as the inner radii, outer radii, distribution of the turns, and types of the litz wires. The second method is to add metal shields around the IPT coils, in which litz wires are used as shields to reduce the shielding losses. The third method is to control the phases of winding currents, which avoids increasing the size and weight of the IPT coils. To attenuate the stray magnetic field by tuning the physical parameters, the conventional method is to sweep all the physical parameters in finite-element simulation. This takes thousands of simulations to derive the Pareto front, and it's especially time-consuming for three-dimensional simulations. This dissertation demonstrates a faster method to derive the Pareto front. The windings are replaced by the lumped loops. As long as the number of turns for each loop is known, the efficiency and magnetic field are calculated directly from the permeance matrices and current-to-field matrices. The sweep of physical parameters in finite-element simulation is replaced by the sweep of the turns numbers for the lumped loops in calculation. Only tens of simulations are required in the entire procedure, which are used to derive the matrices. An exemplary set of coils was built and tested. The efficiency from the matrix calculation is the same as the experimental measurement. The difference for stray magnetic field is less than 12.5%. Metal shields attenuate the stray magnetic field effectively, but generates significant losses owning to the uneven distribution of shield currents. This dissertation uses litz wires to replace the conventional plate shield or ring shield. Skin effect is eliminated so the shield currents are uniformly distributed and the losses are reduced. The litz shields are categorized to two types: shorted litz shield and driven litz shield. Circuit models are derived to analyze their behaviors. The concept of lumped-loop model is applied to derive the Pareto front of efficiency versus stray magnetic field for the coils with litz shield. In an exemplary IPT system, coils without metal shield and with metal shields are optimized for the same efficiency. Both the simulation and experimental measurement verify that the shorted litz shield has the best performance. The stray magnetic field is attenuated by 65% compared to the coils without shield. This dissertation also introduces the method to attenuate the stray magnetic field by controlling the phases of… Advisors/Committee Members: Ngo, Khai D. T. (committeechair), Burgos, Rolando (committee member), Lu, Guo Quan (committee member), Manteghi, Majid (committee member), Zuo, Lei (committee member).

Subjects/Keywords: Inductive power transfer; planar coils; high efficiency; proximity-effect loss; magnetic field; shield; multi-objective optimization; Pareto front

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

APA (6^th Edition):

Lu, M. (2017). Synergetic Attenuation of Stray Magnetic Field in Inductive Power Transfer. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/78621

Chicago Manual of Style (16^th Edition):

Lu, Ming. “Synergetic Attenuation of Stray Magnetic Field in Inductive Power Transfer.” 2017. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/78621.

MLA Handbook (7^th Edition):

Lu, Ming. “Synergetic Attenuation of Stray Magnetic Field in Inductive Power Transfer.” 2017. Web. 27 Feb 2021.

Vancouver:

Lu M. Synergetic Attenuation of Stray Magnetic Field in Inductive Power Transfer. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/78621.

Council of Science Editors:

Lu M. Synergetic Attenuation of Stray Magnetic Field in Inductive Power Transfer. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/78621

Open Access Theses and Dissertations