DAMAGE IDENTIFICATION OF SMART COMPOSITE STRUCTURES USlNG PlEZOELECTRlC ACTUATORS AND SENSORS

为了提高复合材料结构的可靠性和安全性，提出了一种基于动力响应的复合材料智能结构损伤识别方法。本研究得到的结论总结如下：1。本文提出了一种利用时域或频域的动态响应来识别智能复合材料结构中变形的位置和程度的方法。(论文1)2。为了避免损伤的增长，提出了一种基于压电致动器和传感器的智能复合材料结构振动控制方法。(2) 3。在有分层的层合复合材料结构中，明确了分层对结构固有振动频率和振型的影响，并提出了基于压电传感器的损伤识别方法。(3号)4。复合材料结构在冲击作用下的主要损伤形式是基体开裂和脱粒。采用有限元分析方法对复合材料结构的损伤扩展进行了分析，提出了一种预测复合材料结构复杂损伤扩展的分析方法。（第4、5号论文）我们开发了一种模态传感器的构造方法来获取指定的模态位移。通过对多个传感器的优化布置，构建了有效的传感器模型。(6号)

In the present research, we have developed a damage identification method based on the dynamic responses for smart composite structures with piezoelectric actuators and sensors, in order to improve the reliability and safety of composite structures. The conclusions obtained by the present study are summarized as follows:1. We proposed a method to identity the location and extent of dela, ination in smart composite structures wih plezoelectric sensors, using the dynamic responses in the time domain or frequency domain. (Paper No.1)2. We proposed a vibration control method of smart composite structures using piezoelectric actuators and sensors in order to avoid the damage growth. (Paper No.2)3. In the laminated composite structures with a delamination, we clarified the effect of a delamination on the natural vibration frequencies and vibration modes, and also proposed the damage identification method using piezoelectric sensors. (Paper No.3)4. Main damage modes in composite structures under impact force are matrix cracking and delemination. We analyzed damage growth using the finite element analysis, nad developed an analytical method to predict the complicated damage extension in composite structures. (Paper No.4 & 5)5. We developed a construction method of modal sensors to pick up the specified modal displacement. Using the optimal placement of several sensors, the effective model sensors was constructed. (Paper No.6)