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Analysis of guided wave signal based on LabVIEW and STFT

机译:基于LabVIEW和STFT的导波信号分析

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摘要

Ultrasonic guided wave signal is a dynamic non-stationary. There is a serious phenomenon of frequency dispersion in it. Use of traditional time-domain and frequency domain analysis methods can not reveal the characteristics of spectral change over time. So, we Study the characteristics of the signal characteristics of guided waves, describe the time-frequency analysis theory of short-time Fourier transform (STFT), and realize the STFT algorithm and digital filtering based on LabVIEW software. Carried out STFT and time-frequency spectrum analysis for the guided wave in the steel. And find that frequency components in it change over time. Analysis the mode conversion phenomena of a guided wave, it can more Accurate position the defects. The results show that, when the communication distance is far, STFT can be used for its dynamic signal spectrum analysis and pattern recognition, and using the virtual instrument technology. It will have greater application prospects.
机译:超声波导波信号是动态非平稳的。其中存在严重的频率色散现象。使用传统的时域和频域分析方法无法揭示光谱随时间变化的特征。因此,我们研究了导波信号特性的特点,描述了短时傅立叶变换(STFT)的时频分析理论,并基于LabVIEW软件实现了STFT算法和数字滤波。对钢中的导波进行了STFT和时频谱分析。并发现其中的频率分量随时间变化。分析导波的模式转换现象,可以更准确地定位缺陷。结果表明,当通信距离较远时,STFT可以用于其动态信号频谱分析和模式识别,并可以使用虚拟仪器技术。它将具有更大的应用前景。

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