Determination of full piezoelectric complex parameters using gradient-based optimization algorithm

Autor(es)

Kiyono, C. Y. ; Perez, N. ; Silva, E. C. N.

• Tipo de documento: Artigo Científico
• Fonte: Smart Materials and Structures; v. 25, n. 2, p. 18-pg., 2016-02-01.

Resumo

At present, numerical techniques allow the precise simulation of mechanical structures, but the results are limited by the knowledge of the material properties. In the case of piezoelectric ceramics, the full model determination in the linear range involves five elastic, three piezoelectric, and two dielectric complex parameters. A successful solution to obtaining piezoceramic properties consists of comparing the experimental measurement of the impedance curve and the results of a numerical model by using the finite element method (FEM). In the present work, a new systematic optimization method is proposed to adjust the full piezoelectric complex parameters in the FEM model. Once implemented, the method only requires the experimental data (impedance modulus and phase data acquired by an impedometer), material density, geometry, and initial values for the properties. This method combines a FEM routine implemented using an 8-noded axisymmetric element with a gradient-based optimization routine based on the method of moving asymptotes (MMA). The main objective of the optimization procedure is minimizing the quadratic difference between the experimental and numerical electrical conductance and resistance curves (to consider resonance and antiresonance frequencies). To assure the convergence of the optimization procedure, this work proposes restarting the optimization loop whenever the procedure ends in an undesired or an unfeasible solution. Two experimental examples using PZ27 and APC850 samples are presented to test the precision of the method and to check the dependency of the frequency range used, respectively. (AU)

• Processo FAPESP: 15/06334-3 - Um novo elemento de casca piezelétrico de alta ordem para projetar coletores de energia utilizando otimização topológica
• Beneficiário: Cesar Yukishigue Kiyono
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 12/14576-9 - Projeto de Dispositivos Coletores de Energia Piezelétricos Utilizando o Método de Otimização Topológica
• Beneficiário: Cesar Yukishigue Kiyono
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado