The invention belongs to an ultrasonic guided-wave structure health monitoring technology, and particularly relates to a steel rail ultrasonic guided-wave signal time synchronization processing method, which adopts GCC-PHAT, namely a generalized cross-correlation method with the weight being PHAT, adds a weighting function on the basis of a cross-correlation function, weights signals in a power spectrum domain, sharpens the peak value of the cross-correlation function, and finally obtains a time synchronization signal. The effectiveness and accuracy of calculation of the time delay amount between the reference signal and the measurement signal are improved, time domain translation is performed on the measurement signal by using the time delay amount, time synchronization processing of the steel rail ultrasonic guided wave signal is realized, and false detection of steel rail damage caused by the time delay amount is avoided.
本发明属于超声导波结构健康监测技术,特别是关于一种钢轨超声导波信号时间同步处理方法,本发明采用GCC‑PHAT,即权值为PHAT的广义互相关方法,在互相关函数基础上增加权重函数,在功率谱域对信号进行加权,使相关函数的峰值锐化,提高了基准信号与测量信号间时延量计算的有效性及准确性,并利用该时延量对测量信号进行时域平移,实现了钢轨超声导波信号的时间同步处理,避免了由时延量导致的钢轨伤损误检。
Steel rail ultrasonic guided wave signal time synchronization processing method
一种钢轨超声导波信号时间同步处理方法
2023-04-07
Patent
Electronic Resource
Chinese
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