摘要
针对H型钢在损伤情况下对超声导波的影响,提出基于超声导波的结构健康监测方法,并探讨了应用超声导波检测技术在H型钢中对结构损伤识别的可行性及其识别能力。采用中心频率为87.5kHz的波形为汉宁窗调幅3.5个周期正弦曲线作为激励波形,应用商业有限元软件ABAQUS对导波在H型钢构件中的传播进行了仿真,同时对无损伤以及有损伤的仿真模型进行实验验证。实验中利用压电材料锆钛酸铝(piezoelectric lead zirconate titanate,简称PZT)换能器来激发和接收在H型钢中传播的导波信号,借助于Morlet小波时频分析等方法对仿真和实验采集到的信号进行处理,并比较实验结果与仿真结果的吻合度。最后分析H型钢中损伤的大小等因素对损伤识别的影响,以及超声导波在H型钢中的损伤识别能力。
Structural damage of H-shape steel will affect propagation of ultrasonic guided waves.Hence,non-destructive testing technology based on ultrasonic guided waves can realize structural health monitoring(SHM).The possibility of damage size identification of H-shape steel using guided wave approach is discussed.A period sine wave with the center frequency of 87.5 kHz modulated by Hanning window as excitation waveform,the finite element simulation is carried out with commercial finite element analysis software ABAQUS.The finite element modal is then validated by experiment.In experiments,piezoelectric lead zirconate tianate(PZT)wafers are employed to generate excitation waveform propagating in the structures and to collect wave signals as sensors.Taking advantages of morlet wavelet method for the simulation and experiment to process signals collected,the results of experimental measurements and numerical simulation are compared.Finally,the damage depth and thickness influence on damage identification,and the damage identification capability of guided wave in the H-shape steel is analyzed.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2017年第6期1216-1221,共6页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(11372179)
教育部新世纪优秀人才资助项目(NCET-13-0363)
关键词
导波
MORLET小波
损伤识别
结构健康监测
guided wave
Morlet wavelet
damage identification
structural health monitoring
