对称模态兰姆波时间信号的计算机仿真

2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop Pub Date : 2008-12-01 DOI:10.1109/KAMW.2008.4810563

Xiao Chen

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引用次数: 1

摘要

兰姆波的多模特性和频散特性使其信号处理变得复杂。提出了一种在时域上分析对称单模超声兰姆波的方法。在分析对称模兰姆波频散特性的基础上，推导了其时间信号的半解析表达式，并对在铝层中传播一段距离的零阶对称模兰姆波的时间信号进行了仿真计算。分析了在不同频段波形随传播距离的变化。仿真结果表明，该方法能有效地计算出单模兰姆波的时间波形。该方法可为时域对称兰姆波测量技术的应用提供理论基础。

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Computer Simulation for Time Signal of Symmetrical Mode Lamb Wave

The signal processing of Lamb wave is complex because of its multi-mode and frequency-dispersion characteristics. A method to analyze symmetrical single-mode ultrasonic Lamb wave in the time domain is presented. Based on the analysis of frequency-dispersion characteristic of symmetrical mode Lamb wave, we deduced the half analytic expression of its time signal, and implemented simulation computation to the time signal of the zero-order symmetrical mode Lamb wave which had propagated in the aluminum lamina for a distance. The change of waveform with the propagation distance in different frequency bands is analyzed. The simulation result indicated the method could effectively compute the time waveform of single-mode Lamb wave. The method could offer the theoretical foundation for the application of symmetrical Lamb wave measuring technique in the time domain.

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2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop

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