期刊
FACTA UNIVERSITATIS-SERIES MECHANICAL ENGINEERING
卷 21, 期 2, 页码 191-200出版社
UNIV NIS
DOI: 10.22190/FUME230114007H
关键词
Micro-electromechanical system; Eardrum oscillator; Pull-in instability; Asymmetrical oscillation; Vibration attenuation; Energy harvesting
This paper uses the amplitude-frequency formulation for nonlinear oscillators to reveal the critical mechanism of pseudo-periodic motion and discover that the quadratic nonlinear force contributes to the pull-down phenomenon in each cycle. When the force reaches a threshold value, the pull-down instability occurs. A criterion for predicting the pull-down instability is proposed and numerically verified.
A nonlinear vibration system, over a span of convincing periodic motion, might break out abruptly a catastrophic instability, but the lack of a theoretical tool has obscured the prediction of the outbreak. This paper deploys the amplitude-frequency formulation for nonlinear oscillators to reveal the critically important mechanism of the pseudo-periodic motion, and finds the quadratic nonlinear force contributes to the pull-down phenomenon in each cycle of the periodic motion, when the force reaches a threshold value, the pull-down instability occurs. A criterion for prediction of the pull-down instability is proposed and verified numerically.
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