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Theoretical and Experimental Investigations on the Nonlinear Dynamic Responses of Vibration Energy Harvesters in Ambient Environments

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2017, Master of Science, Ohio State University, Mechanical Engineering.
This research advances fundamental knowledge of the dynamics of nonlinear vibration energy harvesting systems operated in ambient environments and delivers straightforward guidelines to effectively implement such platforms for DC power delivery. Ambient environments often contain combinations of harmonic, stochastic, and impulsive kinetic energies. An aim of vibration energy harvesting principles is to capture such kinetic energies in small-scale electromechanical devices and then to convert them into useful electrical power that may supply self-sufficient microelectronics. Previous research has explored the dynamic response of nonlinear vibration energy harvesters when operated in environments with either pure harmonic or pure stochastic excitations, while the more practical combination of the excitation components has not been studied. In addition, conventional research attention to linear AC circuits has led to lack of knowledge on how practical nonlinear rectification circuitry interacts with the energy harvesting platforms. To close the knowledge gaps, this research presents a new analytical framework to directly predict the electrodynamic responses of nonlinear energy harvesters excited by combinations of harmonic and stochastic energies and coupled with a realistic AC-DC rectification and power storage circuit. Following verification and validation, the analysis is leveraged to explore the influences of many system and excitation parameters on the ultimately DC power delivery. Building upon the theoretical formulation, a new optimization approach is then established to explicitly identify optimal design and deployment characteristics that maximize DC power. This research also advances the understanding of how magnetic force interactions in vibration energy harvesting systems may convert impulsive environmental energies into DC power, and closes additional knowledge gaps on the effective integration of such system characteristics. A model is constructed of a multi degree-of-freedom energy harvesting systems and rectification circuitry that converts impulsive inputs into rectified voltage. By studying the roles of the magnetic coupling and dynamic response, the advantages of asymmetries are revealed and quantified with respect to conventional nonlinear energy harvesting structures and symmetric system compositions. All together, the results of this research may be used to advance continued efforts that investigate the interaction between structural and electrical nonlinearities of energy harvesting systems operated in practical, complex excitation environments. The practical knowledge created from this research may also guide the transfer of the fundamental design and dynamics principles studied here into concepts for future energy harvesting technologies.
Ryan Harne (Advisor)
Marcelo Dapino (Committee Member)
139 p.

Recommended Citations

Citations

  • Dai, Q. (2017). Theoretical and Experimental Investigations on the Nonlinear Dynamic Responses of Vibration Energy Harvesters in Ambient Environments [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1510852513217127

    APA Style (7th edition)

  • Dai, Quanqi. Theoretical and Experimental Investigations on the Nonlinear Dynamic Responses of Vibration Energy Harvesters in Ambient Environments. 2017. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1510852513217127.

    MLA Style (8th edition)

  • Dai, Quanqi. "Theoretical and Experimental Investigations on the Nonlinear Dynamic Responses of Vibration Energy Harvesters in Ambient Environments." Master's thesis, Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1510852513217127

    Chicago Manual of Style (17th edition)