In the electrostatic physical field, attention should be paid to define the top electrode of the upper piezoelectric layer as terminal 1, the connection between the bottom electrode of the upper piezoelectric layer and the top electrode of the lower piezoelectric layer as terminal 2. The method is to rotate the relative coordinate system of piezoelectric materials in Z direction by 180 0. The polarization direction of piezoelectric materials in the upper and lower layers of bimorph in series type is opposite. Isotropic loss factors are chosen for the damping of linear elastic materials on the intermediate substrate and mechanical damping of piezoelectric materials on the upper and lower piezoelectric layers. In the physical field of solid mechanics, an inertia load is applied to the whole structure, with the acceleration of 1 g (9.8 m/s 2). Dauksevicius 19 used COMSOL to model and simulate a nonlinear piezoelectric vibration energy harvester with frequency-tuned impacting resonators. Bath 18 used COMSOL to model and simulate 3D folded zigzag piezoelectric energy harvester. Gohari 17 used quadratic piezoelectric multi-layer shell element for analysis of smart laminated composite plates in ABAQUS. Zhou 16 used ANSYS to simulate a flexible longitudinal zigzag structure. Yang 15 used ANSYS to model and simulate a two-dimensional piezoelectric energy harvester. Fey 14 used ANSYS to model and simulate a piezoelectric auxetic PZT lattice structure. Qian 13 used ANSYS to carry out modal analysis of a torsional piezoelectric vibration energy harvesting system. Yang 12 used FEA to optimize the structural parameters of a clamped piezoelectric circular diaphragm. 11 discussed the ANSYS modeling and simulation method of smart piezoelectric beam. Performance comparation of three kinds of piezoelectric bimorph cantilevers with tip mass shows that the modelling and simulation in finite element methods by COMSOL are simple and convenient, and are suitable for the electromechanical coupling analysis and optimization of complex topological structures.įEA has the advantage in the electromechanical coupling modeling and simulation of complex topological structures. Comparing serial and parallel configurations of piezoelectric bimorph cantilever, the output electrical powers, varying with the excitation frequency and load resistance, are also discussed in COMSOL simulation. The simulation error can be reduced to less than 1.2% by using 1D piezoelectric material parameters in COMSOL simulation, while the maximum simulation error can be up to 28% by using 3D piezoelectric material parameters. Compared with the theory and experiment results given by Erturk A, the influences of 1 D and 3 D piezoelectric material parameters on simulation accuracy in FEA modeling is discussed. The COSMOL simulation methods based on 1 D (dimension) model of Euler Bernoulli beam, as well as 2 D and 3 D models of solid mechanics are proposed respectively. This paper studies the method to improve the accuracy of FEA (finite element analysis) simulation for piezoelectric bimorph cantilever. Piezoelectric bimorph cantilever is a typical structure for vibration energy harvesting.
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