Open AccessStudy on Vibration Characteristics of Cantilever Plate with Annular Mass Frame
Author(s) -
Li Hua Chen,
Chao Hou,
Shou Jie Cui,
Lu Tong Shan,
Yang Feng
Publication year - 2020
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/825/1/012017
Subject(s) - cantilever , acoustics , modal analysis , vibration , piezoelectricity , finite element method , structural engineering , normal mode , modal , natural frequency , added mass , modal analysis using fem , modal testing , materials science , engineering , physics , polymer chemistry
The principle of piezoelectric energy harvester is to convert vibration energy into electric energy, which can supply power for other electronic devices. The actual environment vibration is broadband, random and multi-directional, and the working frequency band of piezoelectric energy harvester needs to be increased, so as to raise energy capture efficiency. In order to increase the numbers of resonance frequencies and widen working band, a new type of cantilever plate structure with ring mass frame is designed. This structure is composed of two anti-symmetrically placed cantilever plates with variable cross-section and additional annular mass. Firstly, the natural frequencies and mode shapes of the system are obtained by modal analysis using the finite element method. Based on modal diagrams, the bending and torsional of cantilever plate and the motion of rigid ring mass frame are considered comprehensively, then the theoretical modal functions of the structure are given. Furthermore, the natural frequencies of the structure are obtained by Rayleigh method. Natural frequencies and theoretical modal functions are verified by comparing with the finite ones, which provides theoretical basis for the analysis of the piezoelectric energy harvester in the future.