基于EMD和Cohen核的轨道不平顺信号分析方法

宁静 诸昌钤 张兵

振动与冲击 ›› 2013, Vol. 32 ›› Issue (4) : 31-38.

PDF(3696 KB)
PDF(3696 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (4) : 31-38.
论文

基于EMD和Cohen核的轨道不平顺信号分析方法

  • 宁静1 诸昌钤2 张兵3
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An Approach for Signal Analysis of Track Irregularity by EMD and Cohen’s Kernel

  • NING Jing1, ZHU Chang-qian2 ZHANG Bing3
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文章历史 +

摘要

针对非平稳信号时-频分析中单独使用Cohen核计算二次分布时出现交叉项的实际情况,提出了一种基于EMD和Cohen核的时-频分析方法。首先将信号进行经验模态分解(EMD),然后将分解后的多个固有模态函数(IMF)分别进行Cohen核分布的时-频变换。将仿真信号与理想的仿真结果进行比较,证明此方法能够有效的抑制二次分布中的交叉项。将此方法应用到基于轴箱加速度信号的轨道不平顺分析中,得到的结论与利用轨检车得到的轨道不平顺信息一致,并明显优于常规应用于列车走行部信号分析的频谱分析以及包络线分析方法。此方法对于弥补轨检车的各种不足,高速高密度的进行轨道不平顺的在线监测具有重要应用价值。

Abstract

To minimize the cross-term interference, a method based on Empirical Mode Decomposition ( EMD) and Cohen’s class distribution was advanced. For the method, at first, the time-domain signal was separated into multiple intrinsic mode functions (IMFs) using EMD, then the Cohen’s class distributions of the IMFs were calculated. And a sum of all Cohen’s class distributions was acquired. This approach was testified effected through three typical simulation signals and the result was consistent with the theory. At last this approach was applied to analyze the track irregularity based on the axle-box acceleration. Compared with the result by track inspection car, the Consistent results was get. It indicated that this approach was a good can compensate some shortage for track inspection vehicle ,and it play a important role in the high-speed high-density test track irregularity.

关键词

Cohen类 / EMD / 交叉项 / 轴箱加速度 / 轨道不平顺

Key words

Cohen’s class / Empirical Mode Decomposition / Cross-terms / Axle-box acceleration / Track Irregularity

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导出引用
宁静 诸昌钤 张兵. 基于EMD和Cohen核的轨道不平顺信号分析方法[J]. 振动与冲击, 2013, 32(4): 31-38
NING Jing;ZHU Chang-qian ZHANG Bing. An Approach for Signal Analysis of Track Irregularity by EMD and Cohen’s Kernel[J]. Journal of Vibration and Shock, 2013, 32(4): 31-38

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