Fundamental Research on Self-Controllable Solid State Actuator

研究了一种能自动适应周围介质温度变化的固态致动器。该固态驱动器由各向同性结构层和多层压电陶瓷层组成。分析和数值模拟的结果总结如下：(1)1995年的结果总结：考虑了由各向同性结构层和压电陶瓷层构成的双层复合板。当周围介质温度变化时，给出了控制各向同性结构层自由面法向弹性位移的适当电位差。因此，对自动适应周围介质云温度变化的固态驱动器的概念进行了检验。(2)1996年的研究成果综述：首先，分析了双层复合板在瞬时热载荷作用下的力学行为。给出了暂态外加电位差的数值结果。其次，考虑了由各向同性结构层和两个压电陶瓷层构成的三层复合板。结果表明，与双层复合板相比，三层复合板的外加电势差减小了约40%。(3)1997年的研究结果总结：考虑了由各向同性结构层和多层压电陶瓷层构成的多层复合板。数值结果表明，外加电势差随压电层数的增加或压电层厚度的减小而减小。自控式固态驱动器的优化设计所需的解析和数值结果将会公布。

A solid state actuator which was automatically adaptable to temperature change of the surrounding medium was investigated. The solid state actuator was constructed of an isotropic structural layr and many piezoelectric ceramic layrs. Summary of the results derived from the analyzes and numerical simulations is as follows.(1) Summary of the results obtained in 1995 :A two-layred composite plate constructed of an isotropic structural layr and a piezoelectric ceramic layr was considered. When the temperature of the surrounding medium was changed, an appropriate electric potential difference applied to the piezoelectric ceramic layr which controlled a normal elastic displacement on the free surface of the isotropic structural layr was derived. Therefore, the concept of the solid state actuator automatically adaptable to the temperature change of the surrounding medium cloud be examined.(2) Summary of the results obtained in 1996 :First, the two-layred composite plate subjected to a transient thermal load was analyzed. Numerical results for the transient applied electric potential difference were obtained. Next, a three-layred composite plate constructed of an isotropic structural layr and two piezoelectric ceramic layrs was considered. It was shown that the applied electric potential difference in the case of three-layred composite plate was reduced about 40% in comparison with that in the case of two-layred composite plate.(3) Summary of the results obtained in 1997 :A multi-layred composite plate constructed of an isotropic structural layr and many piezoelectric ceramic layrs was considered. It was shown from the numerical results that the applied electric potential difference decreased as the number of the piezoelectric ceramic layrs increased or the thicknesses of the piezoelectric ceramic layrs decreased. The analytical and numerical results which are necessary for the optimal design of the self-controllable solid state actuator will be published.