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Inverse determinations of the parameters of three-layered plate using angle probe generated Lamb waves
作者姓名:LIUZhenqing  LIUXiao  TADe'an
作者单位:[1]InstituteofAcoustics,TongjiUniversityShanghai200092 [2]DepartmentofElectronicEngineering,FudanUniversityShanghai200433
基金项目:This work was supported by the National Natural Science Foundation of China (10074050)
摘    要:The study on the inverse problems in the ultrasonic nondestructive testing (NDT) has a wide application field in various industries. An error function based inversion algorithm is introduced to determine the parameters of three-layered plates from the measured velocity of multi-mode Lamb waves. A mixed-spectral estimation is proposed to combine FFT with AR model for exact determination of the ultrasonic phase velocity. Experiments are performed using two conventional angle probes as transmitter and receiver on the same surface of three-layered laminates. Inverse analyses of one parameter (thickness) and two parameters (longitudinal and transverse wave velocities in a layer, or thickness of two layers) of three-layered laminates are made. The experimental results show that the inverse approach is in good agreement with the actual value.

关 键 词:拉姆波  角度探测器  参数  反转测定  超声波无损检测  NDT  三层板  测量速率  混合光谱测量  相速
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