超声声表面波检测信号时差的倒频谱分析

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (12) : 159-162.

论文

超声声表面波检测信号时差的倒频谱分析

闫晓玲1,2,董世运2，徐滨士2,刘彬2,王望龙2

作者信息 +

Cepstrum Analysis Method in Surface Acoustic Wave Signals Time Delay Estimation

YAN Xiao-ling1,2, DONG Shi-yun 2, XU Bin-shi2，LIU Bin2， WANG Wang-long2

Author information +

文章历史 +

摘要

采用超声表面波检测激光熔覆层残余应力时, 表面波检测信号声时差的精确读取非常关键。传统的相关法无法精确地辨别表面超声波的声时差。文中提出基于复数倒频谱的表面超声波声时差辨别算法，采用该算法对计算机模拟信号和实际检测信号做了声时差分析，并与相关法的时间分析结果做了对比。计算机模拟和实验结果均表明，倒频谱分析方法是一种精度高，具有一定抗干扰能力的声时差估计算法。最后结合表面超声波检测信号的特点，从理论上分析了倒频谱分析方法优于相关法的原因。

Abstract

When residual stress in laser cladding layer is measured by means of Surface Acoustic Wave(SAW), it is critical that the time delay of SAW signals be read precisely. The time delay of SAW signals can’t be estimated precisely by traditional correlation analysis method. A time delay estimation algorithm based on complex cepstrum is proposed in this paper,it is shown from the computer simulation and experimental results that the new algorithm has higher precision and certain anti-jamming capability in comparison with traditional correlation analysis method. According to the characteristics of SAW signals, the reason that time delay estimation algorithm based on complex cepstrum is superior to correlation analysis method is analyzed in theoretical.

导出引用

闫晓玲;董世运;徐滨士;刘彬;王望龙. 超声声表面波检测信号时差的倒频谱分析[J]. 振动与冲击, 2013, 32(12): 159-162

YAN Xiao-ling;DONG Shi-yun;XU Bin-shi;LIU Bin;WANG Wang-long. Cepstrum Analysis Method in Surface Acoustic Wave Signals Time Delay Estimation[J]. Journal of Vibration and Shock, 2013, 32(12): 159-162