基于超声导波的结构损伤识别方法与技术研究

随着我国高速铁路行业的迅速发展,对车辆的安全运营提出了更高的挑战,为了满足高速列车运行参量和关键结构状态实时监测需求,文章介绍了一种可用于高速列车关键结构件疲劳损伤检测的超声导波监测系统。首先对超声导波疲劳损伤检测机理进行了数学分析;然后介绍了监测系统的整体设计思路,以及压电超声传感器、超声导波检测仪等重要组成部分的工作原理及特征参数;最后,通过仿真分析与疲劳加载试验,验证了超声导波损伤监测系统用于关键结构的损伤监测识别的有效性和准确性。

Research on Method and Technology of Structural Damage Identification Based on Ultrasonic Guided Waves

With the rapid development of high-speed railway industry in China,higher challenges are presented to the safe operation of vehicles.In order to meet the requirements for real-time monitoring of high-speed train operating parameters and key structural conditions,the paper introduces an ultrasonic guided wave monitoring system that can be used for fatigue damage detection for key structural component of high-speed trains.Firstly,the fatigue damage detection mechanism of ultrasonic guided wave is mathematically analyzed.Then,the overall design idea of the monitoring system is introduced,as well as the working principle and characteristic parameters of important components such as piezoelectric ultrasonic sensor and ultrasonic guided wave detector.Finally,the effectiveness and accuracy of ultrasonic guided wave damage monitoring system for damage monitoring and identification of key structures are verified by simulation analysis and fatigue loading test.