基于CHI-LMD方法的转子振动信号分析

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (15) : 58-64.

论文

基于CHI-LMD方法的转子振动信号分析

邓林峰1，2，赵荣珍1，2

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Vibration signal analysis of rotor based on the CHI-LMD method

DENG Lin-feng1, 2, ZHAO Rong-zhen1, 2

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摘要

为解决三次样条插值(Cubic spline interpolation)局部均值分解(Local mean decomposition)(CSI-LMD)方法的分解精度及计算效率偏低问题，提出了一种利用三次Hermite插值(Cubic Hermite interpolation, CHI)和正交性准则(Orthogonality criterion, OC)对CSI-LMD进行改进的新方法。该方法首先以三次Hermite插值代替三次样条插值，求解信号的上/下包络线及均值曲线；其次，用OC判据作为分解过程中乘积函数(Product function, PF)迭代结束的判断条件；最后，与LMD方法的其他步骤相结合，形成了一种新的CHI-LMD方法。仿真和实验结果表明，CHI-LMD方法在分解精度、时间消耗、PF分量的正交性以及分离故障转子的特征振动成分等方面，比CSI-LMD方法更具优势。

Abstract

To solve the problem that the accuracy and efficiency of the cubic spline interpolation-based local mean decomposition (CSI-LMD) method is relatively low, an improved LMD approach based on cubic Hermite interpolation and orthogonality criterion is proposed in this paper. Firstly, cubic spline interpolation is replaced with cubic Hermite interpolation, and furthermore, orthogonality criterion is employed to determine the iterations of deriving each product function. Finally, a novel LMD algorithm can be developed by integrating other procedures of the original LMD. The simulative and experimental results show that the proposed method performs much better than CSI-LMD method in several aspects, including decomposition accuracy, time consumption and so on.

导出引用

邓林峰;赵荣珍;. 基于CHI-LMD方法的转子振动信号分析[J]. 振动与冲击, 2014, 33(15): 58-64

DENG Lin-feng;;ZHAO Rong-zhen;. Vibration signal analysis of rotor based on the CHI-LMD method[J]. Journal of Vibration and Shock, 2014, 33(15): 58-64