CONTROL OF ELASTIC DISPLACEMENT IN PIEZOELECTRIC-BASED INTELLIGENT PLATE SUBJECTED TO THERMAL LOAD

The present paper discusses an intelligent solid-state actuator which can control a distribution of the elastic displacement at the submicro n order, in the case where temperature changes in the surrounding medi um induces elastic deformation in the actuator. The intelligent actuat or consists of an isotropic structural plate to which a piezoelectric ceramic plate is perfectly bonded. First, by analyzing an inverse prob lem of piezothermoelasticity, the temperature change of the surroundin g medium is inferred from the electric potential on the piezoelectric ceramic plate. Next, analysis of a direct piezoelastic problem leads t o an appropriate electric potential applied to the piezoelectric ceram ic plate which suppresses the induced normal elastic displacement on t he free surface of the isotropic plate. Finally, numerical results are illustrated graphically. (C) 1997 Elsevier Science Ltd.