基于应变模态的轨道板裂缝与脱空识别方法研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (4) : 179-184.

论文

张晓东1,2，梁青槐1

作者信息 +

A study on crack and motor-void identification of ballastless track slab using strain modal

ZHANG Xiaodong1,2,LIANG Qinghuai1

Author information +

文章历史 +

摘要

基于应变模态对损伤敏感、轨道板应变数据易于测量的特点，提出基于应变模态的无砟轨道轨道板裂缝与脱空识别方法。研究了轨道板的应变模态理论和应变模态分析方法。用数值仿真方法分析了损伤轨道板的应变模态特征，表明一阶应变模态振型在轨道板损伤区域有明显的弯曲，可作为损伤识别参数。提出了损伤识别的应变模态曲率差指标及其计算方法，研究了其对轨道板裂缝与脱空的识别能力和识别方法。应变模态曲率差对轨道板的开裂和脱空有很强的表征能力，应变模态曲率差矩阵的F范数可表征轨道板的开裂程度。

Abstract

An identification approach of damage such as slab crack and motor-void of ballastless track was proposed considering the strain modal is sensitive to damage and the strain of the slab is easy to be measured.Theory and analytical method of slab strain modal was studied.The feature of slab strain modal was analyzed using a numerical simulation method.The 1st order strain modal shape of the slab is curved obviously in the damaged region.The index of strain modal curvature difference (SMCD) was put forward and its computational method was established.Identification ability and the method of SMCD for slab crack and motor-void of ballastless track was studied.The results show that SMCD is a typical index of damaged ballastless track, and the crack magnitude can be measured in term of F-norm of SMCD matrix.

导出引用

张晓东1,2，梁青槐1. 基于应变模态的轨道板裂缝与脱空识别方法研究[J]. 振动与冲击, 2020, 39(4): 179-184

ZHANG Xiaodong1,2,LIANG Qinghuai1. A study on crack and motor-void identification of ballastless track slab using strain modal[J]. Journal of Vibration and Shock, 2020, 39(4): 179-184

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