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Application of wavelet-spectrum analysis of acoustic signals for fatigue fracture diagnostics by free oscillation technique

机译:自由振荡技术在疲劳骨折诊断中对声学信号的应用

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Free oscillation technique (FOT) is widely used for research and diagnostics of fatigue cracks in metal parts, for revealing former in bolted and rivet joints etc. The main criteria for mechanical state evaluation using FOT is shift of natural frequency maxima in Fourier spectrum toward lower frequencies with increasing size of discontinuity. In this work with use of designed software for wavelet-analysis of 1D signals fatigue fracture of structural steel was investigated. The main informative features of wavelet-spectra used under FOT diagnostics are discussed. It is shown that consideration of wavelet-spectrum changes over frequency and time ranges allows increasing significantly reliability of diagnostics.
机译:自由振荡技术(FOT)广泛用于金属部件疲劳裂缝的研究和诊断,用于螺栓固定和铆接接头等。使用FOT的机械状态评估的主要标准是傅立叶谱中的自然频率最大值的转变频率越来越大的不连续性。在这项工作中,使用设计软件的小波分析1D信号疲劳骨折结构钢的疲劳骨折。讨论了在FOT诊断下使用的小波光谱的主要信息特征。结果表明,对频率和时间范围的小波频谱变化的考虑允许增加诊断的显着可靠性。

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