Influence of nonlinear constitutive relations in unimorphs piezoelectric harvesters

16th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Gatti, C.D.^1 ; Ramirez, J.M.^1 ; Machado, S.P.^1 ; Febbo, M.^2

Grupo de Investigación en Multifísica Aplicada, Universidad Tecnológica National FRBB, CONICET, 11 de Abril 461, Bahía Blanca

8000, Argentina^1

Instituto de Física Del sur, CONICET and Departamento de Física, Universidad Nacional Del sur, Av Alem 1253, Bahía Blanca

8000, Argentina^2

关键词: Harmonic Balance method;    Model identification;    Non-linear parameters;    Nonlinear constitutive relation;    One-dimensional model;    Piezoelectric equation;    Piezoelectric harvester;    Piezoelectric unimorph;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/773/1/012093/pdf
DOI  :  10.1088/1742-6596/773/1/012093

来源: IOP

【 摘 要 】

This paper presents the influence of nonlinear terms of a previously proposed constitutive piezoelectric equation on the dynamics of a cantilever aluminium beam with a piezoelectric unimorph PZT (MIDE QP16N) attached to it. The system is subjected to different levels of base acceleration with the intention to evidence the limits of the linear model. To carry out the analysis, a one-dimensional model is applied and solved employing a single-term solution of the harmonic balance method to compare with the experiments. A model identification of linear and nonlinear parameters such as dissipation, stiffness, and electromechanical coupling were then performed. From the results, it is possible to observe the departure of the linear model even for very low acceleration levels (0.1G). It can be concluded that the nonlinearity plays an unavoidable roll in predicting electric generation for the considered systems.