Identification procedure for real and imaginary material parameters of piezoceramic materials

By means of numerical simulations, the efforts for the development of piezoceramic transducers can be consider ably reduced. However, reliable simulations of the transducer´s behavior require precise material parameters which can not be obtained with common parameter identification methods. Therefore, we use an alternative approach to determine these parameters, the so-called Inverse Method. Basically, simulations and measurements for the frequency resolved electrical impedance and the spatially as well as frequency resolved surface normal velocity serve as input quantities. In this contribution, we present an extended Inverse Method enabling the determination of damping coefficients which are decisive for the description of dissipative losses in piezoceramic materials. The method is applied to a discoidal transducer made of Pz27. The results clearly show that the Inverse Method under consideration of the damping coefficients provides material parameters which can be used for reliable simulations of the transducer´s behavior.