Open AccessCoherence resonance of nonlinear piezoelectric energy harvester under broadband random excitation
Author(s) -
Haitao Li,
Weiyang Qin
Publication year - 2014
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.63.120505
Subject(s) - bistability , energy harvesting , nonlinear system , stochastic resonance , coherence (philosophical gambling strategy) , physics , excitation , linearization , energy (signal processing) , vibration , random vibration , acoustics , noise (video) , computer science , quantum mechanics , artificial intelligence , image (mathematics)
With the development of micro electromechanical systems, many researchers focus their attention on nonlinear energy harvesting device. The stochastic equivalent linearization method is used to analyze an energy harvesting system under ambient noise. First, according to the bistability of beam axially loaded, a model of bistable nonlinear vibration energy harvester under the stochastic condition is proposed. A close-form approximation expression for the ensemble average of harvested power is derived and the numerical simulation of the system shows stochastic resonance. The results show that it is possible to optimally design system such that the harvest power is maximized for a given density or variance of random excitation.