基于超声导波的钢梁结构损伤大小识别研究  

Damage size identification of thick steel beam based on ultrasonic guided wave

作　　者：孙凯[1] 孟光[1] 叶林[2] 李富才[1] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240 [2]悉尼大学宇航机械与机电工程学院智能材料与结构实验室

出　　处：《振动与冲击》2011年第9期227-231,共5页Journal of Vibration and Shock

基　　金：科技部国际科技合作重点项目(2005DFA00110);国家自然科学基金资助项目(10702041;11072148)

摘　　要：探讨了应用超声导波检测技术在较厚结构中对结构损伤大小识别的可行性。基于优化的激励波形和PZT换能器布局,应用商业有限元软件Abaqus对导波在结构中的传播进行了仿真;同时对无损伤及有损伤的仿真模型进行了实验验证,实验信号与仿真波形具有很好的吻合度。仿真结果表明:随损伤深度或者损伤厚度的增加,损伤反射波波包、透射波波包的到达时间和信号幅值都会随之呈现一定规律的变化,从中提取变化较大的信号特征可用于损伤大小的识别。The possibility of damage size identification of relatively thick structures with PZT transducers using guided wave approach was discussed.Based on optimized excitation wave parameters and PZT transducers layout,the finite element simulation was carried out with commercial FE analysis software Abaqus.The FE modal was then validated by experiment,and good agreement is found between the results of experimental measurements and numerical simulation.Simulation results show that the arrival time and magnitude of damage-reflected wave packet as well as transmitted wave packet change regularly with the increasing of damage depth or thickness,based on which the features can be extracted for the purpose of damage size judging.

关 键 词：损伤大小识别 超声导波 特征提取 到达时间 信号幅值 

分 类 号：TU317[建筑科学—结构工程]