A Global Optimization Method to Determine the Complex Material Constants of Piezoelectric Bars in the Length Thickness Extensional Mode

Optimization methods have been used to determine the elastic, piezoelectric, and dielectric constants of piezoelectric materials from admittance or impedance measurements. The optimal material minimize difference between modeled measured spectra. In this paper, a global optimization method is proposed calculate bars in length thickness extensional mode. algorithm applied soft PZT hard shown be robust.