Fundamental Study on Optimum Design of an Intelligent Composite Plate for Control of Stresses

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This study discusses intelligent control problems in a multi-layered composite plate consisting of a structural layer with heat resistance onto which piezoceramic layers are bonded, when a thermal load acts on the structural layer surface and a number of electrodes are concentrically arranged on actuator layers. The thermoelastic displacement distribution or the maximum thermal stress in the structural layer has been controlled by applying appropriate voltages to the electrodes and optimum design problems of the composite plate have been solved in order to demonstrate the functions to the maximum.1. Control of a thermoelastic displacement distributionA technique for the direct control has been developed through the determination of applied voltages when stress constraints are imposed on the actuator layers. An optimum design of a composite plate with multiple actuator layers has been prepared in order to minimize the maximum applied voltage. In the case of a composite disk with sensor and actuator layers, an intelligent control has been demonstrated by combining an inverse analysis of determining an unknown thermal load from the sensor output with the direct control technique.2. Control of the maximum thermal stressSimilar to the displacement control problem, a technique for the direct control of the maximum thermal stress has been developed. An optimum design of a composite plate with multiple actuator layers has been prepared so that the suppression ratio of the thermal stress is at its maximum. In the case of a composite disk with sensor and actuator layers, an intelligent control of the maximum thermal stress has been demonstrated by combining an inverse analysis of determining an unknown thermal load from the sensor output with the direct control technique.Finally, an optimum design procedure of the intelligent composite plate that controls the maximum thermal stress has been developed.