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

本研究讨论了智能控制问题，在多层复合板组成的结构层与耐热压电陶瓷层粘接，当热负荷作用在结构层表面和一些电极上的致动器层同心排列。通过在电极上施加适当的电压，控制结构层中的热弹性位移分布或最大热应力，并解决了复合板的优化设计问题，以最大限度地发挥其功能.控制的热弹性位移分布的直接控制技术已经开发出通过确定施加的电压时，施加在致动器层上的应力约束。为了使最大外加电压最小化，对具有多个致动器层的复合板进行了优化设计。在具有传感器和致动器层的复合盘的情况下，通过将从传感器输出确定未知热负荷的逆分析与直接控制技术相结合，已经证明了智能控制。最大热应力的控制与位移控制问题类似，已经开发了一种直接控制最大热应力的技术。本文提出了一种具有多个致动层的复合材料板的优化设计，使热应力的抑制率达到最大。以具有传感器层和致动器层的复合材料盘为例，通过将由传感器输出确定未知热载荷的逆分析与直接控制技术相结合，实现了对最大热应力的智能控制，最后给出了控制最大热应力的智能复合材料盘的优化设计方法。

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.