基于匹配延拓的ITD边界效应抑制方法研究

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (7) : 165-169.

论文

基于匹配延拓的ITD边界效应抑制方法研究

胥永刚陆明付胜张建宇

作者信息 +

Research on the end effect restraining method of intrinsic time-scale decomposition based on extension

XU Yonggang LU Ming FU Sheng ZHANG Jianyu

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文章历史 +

摘要

作为一种新的非平稳信号处理方法，固有时间尺度分解法在将复杂的非平稳信号分解为若干个固有旋转分量过程中，存在着严重的边界效应问题。本文针对抑制边界效应提出了五种数据延拓方法：自适应波形匹配、基于AR模型的延拓方法、镜像延拓方法、多项式延拓方法、反对称周期延拓法。通过数学模拟实验比较这五种方法的抑制效果，选出最优方法。将最优方法用于仿真信号和轴承故障振动信号分析，结果表明该方法能够有效地抑制边界效应，可更好地提取机电设备故障特征。.

Abstract

As a new non-stationary signal process method, The intrinsic time-scale decomposition method (ITD) can decompose a complex non-stationary signal into several proper rotation components (PRCs), but there will be involved end effect in some PRCs. Five end effect mitigation methods to deal with the end effect is proposed in this paper. Including adaptive extension、AR prediction method、 mirror extrema extending、polynomial fitting extending method、anti-symmetric extensions method. Five methods are compared by mathematical simulation. The best one is applying in the simulated signal and bearing fault vibration signals, the results show that the new method can be used to solve the end effect effectively and the fault feature of the mechanical equipments can be extracted .

导出引用

胥永刚陆明付胜张建宇. 基于匹配延拓的ITD边界效应抑制方法研究[J]. 振动与冲击, 2014, 33(7): 165-169

XU Yonggang LU Ming FU Sheng ZHANG Jianyu. Research on the end effect restraining method of intrinsic time-scale decomposition based on extension[J]. Journal of Vibration and Shock, 2014, 33(7): 165-169