REAL-TIME HEALTH MONITORING OF COMPOSITE STRUCTURES BASED ON ACTIVE SENSING

为了提高复合材料结构的可靠性和安全性，我们开发了一种基于压电传感器的智能复合材料结构实时、自动健康监测方法。本研究得到的结论总结如下：1。提出了一种利用压电传感器的动态响应来估计冲击位置和冲击历史的力识别方法。通过脉冲蜂蜂机对CFRP叠合板的冲击试验，验证了该方法的有效性，表明在冲击后几秒内即可准确识别出冲击力的位置和历史。利用损伤增长分析方法，提出了一种冲击作用下的损伤实时监测方法。提出了一种基于压电致动器和传感器的层合复合材料损伤监测方法。利用复合材料中Lamb波的速度变化可以有效地识别拉伸作用下交叉层合板的基体裂纹密度。本文提出了一种高效的谱分析方法，用于分析具有基体开裂或分层的层合复合材料的波动。

In the present research, we have developed a real-time and automatic health monitoring method for smart composite structures with piezoelectric 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 force identification method to estimate the location and history of impact force using dynamic responses of piezoelectric sensors embedded in composite laminates. The validity of the present method is verified through an impact experiment of CFRP laminated plates using impulse hummer, and it is shown that the location and history of impact force can be identified precisely in a few seconds after impact. A real-time damage monitoring method under impact force is also developed by using damage growth analysis.2.We proposed a damage monitoring method of laminated composites based on an active sensing using piezoelectric actuators and sensors. The density of matrix cracking of cross-ply laminates under extension is identified effectively from the velocity variation of Lamb waves in laminated composites with and without damage.3.Highly effective spectral analysis is developed to analyze the wave motion in laminated composites with matrix cracking or delamination.