Inverse determinations of the parameters of three-layered plate using angle probe generated Lamb waves  

作　　者：LIUZhenqing LIUXiao TADe'an 

机构地区：[1]InstituteofAcoustics,TongjiUniversityShanghai200092 [2]DepartmentofElectronicEngineering,FudanUniversityShanghai200433

出　　处：《Chinese Journal of Acoustics》2003年第4期314-322,共9页声学学报（英文版）

基　　金：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 modei 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.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 modei 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.

分 类 号：TB551[理学—物理]