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超声导波已被广泛应用于无损检测与评价,针对超声导波应用中普遍存在的模式混叠与频散问题,本文在采用频谱相位与信号时延函数建模导波频散信号传递系统的基础上,提出了一种单一模式的频散补偿算法。进一步地,通过将选择性频散补偿技术与导波模式分离相结合,本文算法克服了传统补偿算法所不能解决的多模式导波频散问题。板中的Lamb波A_0,A_1和S_0混合模式仿真分析表明,本算法不仅可用于单一导波模式信号合成与频散补偿,而且可在实现多模式混合导波信号选择性频散补偿基础上,解决多模式导波信号中单一模式提取与分离。本文研究有助于超声导波多模式频散信号的分析与处理.
Ultrasonic Guided Wave has been widely used in non-destructive testing and evaluation. Aimed at the aliasing and dispersion problems in ultrasonic Guided Wave (UWG) applications, this paper uses the spectral phase and signal delay function to model the guided-wave dispersion signal transmission system Based on this, a single-mode dispersion compensation algorithm is proposed. Furthermore, the proposed algorithm overcomes the multi-mode guided-wave dispersion problem that traditional compensation algorithms can not solve by combining selective dispersion compensation with guided-wave mode separation. The simulation analysis of Lamb wave A_0, A_1 and S_0 mixed modes shows that the proposed algorithm can be used not only for signal synthesis and dispersion compensation in single pilot mode, but also for selective dispersion compensation of multi-mode hybrid guided-wave signals. Solve single mode extraction and separation in multi-mode guided wave signal. This paper is helpful to the analysis and processing of multi-mode ultrasonic guided wave dispersion signals.