5.1.2 A DC bias approach to the characterisation of non-linear material parameters of piezoelectric ceramics
- 20. GMA/ITG-Fachtagung Sensoren und Messsysteme 2019
2019-06-25 - 2019-06-26
- 5.1 Werkstoffprüfung und -charakterisierung 2
- D. Dreiling, N. Feldmann, B. Henning - Universität Paderborn (Deutschland)
- 391 - 397
Piezoelectric materials are used for various sensor and actuator purposes. Especially in power acoustic applications piezoceramics are loaded with electrical DC voltage or mechanical pre-load, in addition to the excitation signal. Due to the lack of knowledge of material parameters for piezoceramics, particularly in this operating mode, the design of a power transducer is demanding and often strongly empirically driven. A simulation-supported design process requires that a non-linear model for the piezoelectric material behaviour is known. A first step towards this material model is the description of linear approximated material properties in different operating points. To shift this operating point a DC bias voltage is applied to various piezoelectric discs and the frequency dependent impedance is determined. The results indicate a shift of all characteristic resonance frequencies as well as changes of piezoelectric parameters directly dependent on the applied bias voltages.