Analysis on edge estimation of functional layer defect in ballastless track based on Burg power spectrum

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (10) : 1-6.

YANG Yong1，LU Junwei1，LI Rongzhe2，TIAN Xiushu3，ZHAO Weigang2

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Abstract

Defects in the functional layer of ballastless track directly affect the operation safety of high-speed railway (HSR), but the existing methods are hard to accurately estimate the defect size, resulting in difficulties in state evaluation of ballastless track.To solve this problem, firstly, layered medium echo model of ballastless track with defect was established, the relationship between the location of the detection point and the defect echo of the functional layer was analyzed, and the frequency distribution model of the edge wave echo was proposed.Secondly, an autoregressive (AR) power spectrum model was studied, the frequency resolution of Burg power spectrum and the acquisition method of related parameters were analyzed, and on this basis, the imaging method of ballastless track functional layer defects was presented.Finally, CRTSⅢ ballastless track field experiment was carried out to verify the applicability of this method in defect detection of ballastless track.The results show that the imaging method based on Burg power spectrum can accurately perform the edge estimation and defect imaging of functional layer.The research results can be used for defect detection and state evaluation of ballastless track, and provide theoretical support for the safe operation of HSR.

Key words

ballastless track / functional layer defect / edge estimation / Burg power spectrum

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YANG Yong1，LU Junwei1，LI Rongzhe2，TIAN Xiushu3，ZHAO Weigang2. Analysis on edge estimation of functional layer defect in ballastless track based on Burg power spectrum[J]. Journal of Vibration and Shock, 2020, 39(10): 1-6

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