Open AccessOptimization for cantilever piezoelectric energy harvester with a cavity
Author(s) -
LiHui Chen,
Jiangtao Xue,
Liqi Chang,
Yang Feng
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/629/1/012027
Subject(s) - multiphysics , acoustics , piezoelectricity , cantilever , transducer , materials science , modal analysis , finite element method , voltage , modal , frequency domain , frequency response , bandwidth (computing) , energy harvesting , low frequency , energy (signal processing) , engineering , physics , electrical engineering , structural engineering , vibration , computer science , composite material , telecommunications , quantum mechanics , computer vision
The structure optimization of piezoelectric energy harvester aims at frequency reduction, broadening bandwidth and increasing output mainly. This paper employs a cantilever with cavity modelled by the finite element software COMSOL Multiphysics and the effect of the cavity on transducer is studied. The first order characteristic frequency is obtained by modal analysis module and the frequency response curve is solved by frequency domain analysis module. Comparison results show that the introducing of cavity improves output voltage of energy harvester and reducing device nature frequency. Moreover, effect of the cavity size parameters such as the thickness, length and position on frequency, output and conversion rate of the harvester is studied, after that the energy harvester structure is optimized.