Identification of Piezoelectric Material Parameters Using Optimised Multi-Electrode Specimens (vor Ort)
* Presenting author
Abstract:
Due to the availability of computational resources, modern design processes of sensor and actor systems are becoming increasingly simulation-driven. A prerequisite of these processes is, however, that the materials used are well-known and described by a material model. For piezoceramic materials the parameters of such a model is especially hard to determine, as it includes mechanical, electrical, and piezoelectric quantities.The authors have previously shown that a complete set of piezoelectric material parameters can be identified based on three electrical impedance measurements of a disc-shaped specimen with three ring electrodes. As a continuation of this work, a new electrode structure requiring only a single impedance measurement is determined by a simulation-based sensitivity optimisation process. Using this new electrode structure, the material parameters of a physical specimen are determined in an inverse procedure by matching the measured impedance with the impedance of a virtual sample incorporating the parameterised material model using an optimisation algorithm. Along with linear parameters for mechanical, electrical, and piezoelectric behaviour, absorption parameters are determined as well. Good agreement between virtual and physical impedances indicates the model’s potential to describe the physical behaviour accurately.
