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驱动器。该固态驱动器由一个各向同性结构层和多个压电陶瓷层构成。从分析和数值模拟得出的结果总结如下。(1)1995年获得的结果摘要：考虑了由各向同性结构层和压电陶瓷层构成的双层复合材料板。当周围介质的温度发生变化时，施加在压电陶瓷层上的适当电势差控制各向同性结构层自由表面的法向弹性位移。因此，固态致动器的概念，自动适应周围介质云的温度变化进行审查。(2)1996年所得结果的总结：首先，分析了承受瞬态热载荷的双层复合材料板。得到了瞬态外加电位差的数值计算结果。其次，考虑了由一个各向同性结构层和两个压电陶瓷层构成的三层复合材料板。结果表明，三层复合板的外加电位差比两层复合板的外加电位差降低了约40%。(3)1997年获得的结果总结：考虑了由各向同性结构层和许多压电陶瓷层构成的多层复合材料板。数值结果表明，随着压电陶瓷层数的增加或压电陶瓷层厚度的减小，外加电位差减小。文中给出了可控固态驱动器优化设计所需的理论分析和数值计算结果。

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.