温度对压电陶瓷传感器信号传输的影响研究

Influence of temperature on the piezoelectric transducer signal transmission

近年来,飞机结构健康监测技术得到了快速的发展,并在航空航天等领域得到了广泛的应用,特别是在碳纤维复合材料结构的状态监控与损伤诊断方面更是明确了功能材料与智能结构的发展趋势。首先分析了航空领域典型的结构健康监测技术,包括模态法、机电阻抗法、超声法、声发射法、Lamb波法,并对其中的Lamb波法进行深入讨论。而后,开展了基于Lamb波技术的温度对压电陶瓷传感器信号传输影响的实验研究。该研究考虑了实验装置及传感器在高温环境下的特性,特制了用于测试压电陶瓷传感器信号传输特性的高温实验装置,将压电陶瓷传感器通过机械方式安装于实验装置上,开展环境实验。分别对五档不同温度下的实验结果进行分析,研究结果表明:温度对压电陶瓷传感器信号传输具有一定影响,并给出了信号受温度影响的变化规律。

In recent years,aircraft structural health monitoring technology has been developed rapidly,and has been widely applied in aeronautics and astronautics,especially in the aspect of the condition monitoring and damage diagnosis of carbon fiber composite structures,which makes clear the development trend of functional materials and intelligent structures.Firstly,the typical aircraft structural health monitoring technologies were analyzed,including mode method,mechanical-and-electrical-impedance method,ultrasonic method,acoustic-emission method,Lamb-wave method,and Lamb-wave method was further discussed.Then,the influence of temperature on the piezoelectric transducer signal transmission was studied based on Lamb-wave technology.The research considers the characteristics of the experimental device and the sensors in the high temperature environment.A high temperature experimental device was designed to test the signal transmission characteristics of the piezoelectric transducer.The piezoelectric transducers were installed on the experiment device to carry out the environmental experiment by the mechanical method.The results of experiments at different temperatures of five gears were analyzed respectively.The analysis results show that the temperature has a certain influence on the signal transmission of piezoelectric transducer,and the variation law of the signal affected by temperature was given.