Nonlinear vibration energy harvesting by intentional excitation of high-frequency dynamical instability

Strong nonlinearity;Impulsive excitation;Electromechanical coupling

Remick, Kevin R.

关键词: Strong nonlinearity;    Impulsive excitation;    Electromechanical coupling;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/78640/REMICK-DISSERTATION-2015.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

In this thesis, a vibration-based energy harvesting system utilizing essential(nonlinearizable) nonlinearities and various electromechanical couplingelements is investigated. These elements include electromagnetic and piezoelectricmethods of energy conversion. The mechanical system of interestconsists of a grounded, weakly damped linear oscillator (primary system)subjected impulsive loading. This primary system is coupled to a lightweight,damped oscillating attachment (nonlinear energy sink, NES) via athin wire, which generates an essential geometric cubic sti ness nonlinearity.Various electromechanical coupling elements are included within the oscillatorcoupling in various con gurations depending on the system being studied.Under single or repeated impulsive input, the damped dynamics of this systemexhibit transient resonance captures (TRCs) causing large-amplitude,high-frequency instabilities in the response of the NES. These TRCs resultin strong energy transfer from the directly excited primary system to thelight-weight attachment. The energy is harvested by the electromechanicalelements in the coupling and, in this present case, dissipated across a resistiveelement in the electrical circuit. The primary goal of this work is tonumerically, analytically, and experimentally demonstrate the e cacy of employingthis type of high-frequency dynamic instability to achieve enhancedvibration energy harvesting under single or repeated impulsive excitation.