کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5016287 | 1464966 | 2017 | 8 صفحه PDF | دانلود رایگان |
- Analysis of the electromechanical response of a piezoelectric bimorph operated by a constant voltage source is developed.
- The self-induced electric displacement field is considered using the extended Hamilton's principle for electromechanical systems.
- The tip deflection of a piezoelectric bimorph is affected by the self-induced displacement field.
- The short-circuit stiffness of a piezoelectric bimorph depends on the piezoelectric coupling coefficient..
- The analytical results are validated with the experimental results published in literature.
This paper analytically illustrates the response of a piezoelectric bimorph actuator considering the effect of self-induced electric displacement field. In the analysis, we have considered response of the actuator at high electric field. The self-induced electric displacement field exists inside the piezoelectric actuator during its bending. This effect was not considered in the earlier modeling, which typically followed stress-strain based approaches, instead of following the extended Hamilton's principle for electromechanical systems driven by constant voltage source. This electric displacement field affects the tip deflection of a piezoelectric actuator. The new derivation based on Hamilton's principle also shows that a piezo-bimorph's short circuit stiffness, which was considered independent of the piezoelectric coupling coefficient in earlier literature, actually depends on the piezoelectric coupling coefficient. A piezoelectric material of high piezoelectric coupling coefficient can produce a significant self-induced electric displacement field, which can significantly impact the tip deflection and the stiffness of a piezoelectric bimorph actuator. The analytical results are validated with the experimental results, published in earlier literature.
Journal: International Journal of Mechanical Sciences - Volume 120, January 2017, Pages 341-348