超声导波正轨动态检测信号畸变矫正算法研究

The Research of Correction Algorithm for Rail Detection Signal Distortion Using Ultrasonic Guided Waves

针对铁路正轨结构完整性检测的迫切需求,提出了一种超声导波正轨动态检测信号畸变矫正算法。由于正轨导波回波信号对环境变化非常敏感,环境温度、激励电压飘移、电磁干扰等因素都会造成检测信号的畸变。本文以噪声概率分布为依据,结合了希尔伯特变换、线性插值、局部最大相关性、波幅调整等多种处理方法,有效克服了这些因素对检测信号稳定性和可靠性的影响。

Aiming at the urgent need of railway track structural integrity inspection,we propose a compensation algorithm for signal distortion in guided wave rail track detection with mobile device.Due to the reflection signals of guided waves in rails are very sensitive to environmental changes,such as environmental temperature,excitation voltage offset,electromagnetic interference.These changes can distort received signals.The proposed method,based on noise probability distribution,combining with Hilbert transform,linear interpolation,local maximum correlation,amplitude adjustment and other signal-processing methods,successfully eliminates the effect of environmental changes on the stability and reliability of detection signals.