超声导波模态识别方法比较
Comparison of Mode Identification Methods for Ultrasonic Guided Waves
摘 要
模态转化是超声导波缺陷检测的重要表征之一, 因而确定超声导波的模态在超声导波检测中有重要意义。采用数值模拟方法, 得到利用窄带信号激励梳状换能器, 在铝管中产生轴对称纵向导波时, 铝管表面的面内位移和离面位移值。对采集到的位移信号分别使用时域法、二维傅里叶变换法以及矩阵束方法进行处理, 从中提取存在的导波模态。由处理结果可知, 三种方法均能判断导波模态, 但其又具有各自的特点和局限性。
传播模态
矩阵束方法
Ultrasonic guided waves testing
Propagation mode
The matrix-pencil method
Abstract
The mode conversion is one of the important characters in guided wave detection, so the determination of guided wave modes plays an important role in the detection. The in-plane and out-plane displacements at the outer face of aluminum pipe are got numerically when exciting the comb transducer using tone burst signal to generate axisymmetric longitudinal waves. The collected displacement signals are processed by time-domain method, two-dimensional fast Fourier transform and matrix-pencil method respectively, so to identify the guided wave mode in pipe. The processing result shows all the three methods can be used to identify the guided wave mode with their own characteristics and limitations, respectively.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
基金项目
收稿日期 2008/6/4
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备注王冰(1981-), 男, 博士, 研究方向为材料损伤及寿命评估。
引用该论文: WANG Bing,XU Hong,LIU Peng-Cheng. Comparison of Mode Identification Methods for Ultrasonic Guided Waves[J]. Nondestructive Testing, 2009, 31(6): 438～441
王冰,徐鸿,刘鹏程. 超声导波模态识别方法比较[J]. 无损检测, 2009, 31(6): 438～441
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参考文献
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【2】Hua Yingbo, Sarkar Tapan K. Matrix pencil method for estimating parameters of exponentially damped/undamped sinusoids in noise[J]. IEEE Transaction on Acoustics Speech and Signal Processing, 1990, 38(5): 814-824.
【3】Rose J L, Pelts S P, Quarry M J. A comb transducer model for guided wave NDE[J]. Ultrasonics, 1998, 36(1-5): 163-169.
【4】Zhu Wenhao. An FEM simulation for guided elastic wave generation and reflection in hollow cylinders with corrosion defects[J]. Journal of Pressure Vessel Technology, 2002, 124(1): 108-117.
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