Fundamental Research on Self-Controllable Solid State Actuator

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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.