一种基于改进的傅立叶变换的弱故障信号特征提取新方法研究

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振动与冲击 ›› 2009, Vol. 28 ›› Issue (8) : 172-174.

论文

一种基于改进的傅立叶变换的弱故障信号特征提取新方法研究

苏永生王永生段向阳张永祥

作者信息 +

A NEW EXTRACTION METHOD RESEARCH FOR WEAK FAULT SIGNAL BASED ON IMPROVED FOURIER TRANSFORM

su Yongsheng Wang Yongsheng Duan Xiangyang Zhang Yongxiang

Author information +

文章历史 +

摘要

弱信号特征提取一直是故障诊断领域的难点，文章结合传统傅立叶变换，提出一种将时间序列变换为频域，再从频域转换到时域的复数域，并对该复数域进行幅值计算的方法对弱信号进行特征提取。通过仿真计算发现该方法突出了信号的局部特征信息，不仅能对夹杂在信号中的微弱冲击成分进行较好的再现，而且也能在强背景噪声环境下提取微弱故障信息。最后通过齿轮齿面接触型故障实验验证了该方法的有效性。

Abstract

It is difficult to pick up weak signal at the domain of fault diagnosis. A new weak signal feature extraction method based on Fourier Transform is presented. Firstly，time serial was switch to frequency domain；Secondly，the value of frequency was transformed into time complex number field; Moreover, the breadth of complex number was calculated. The arithmetic gives prominence to the part character information of signal by simulation. The weak impulsion in mixed-signal is given preferable reappearance and is also picked-up in powerful background noise. Lastly, the gear fault diagnosis experiment indicates that this algorithm is able to extract the weak fault feature signal.

导出引用

苏永生王永生段向阳张永祥. 一种基于改进的傅立叶变换的弱故障信号特征提取新方法研究[J]. 振动与冲击, 2009, 28(8): 172-174

su Yongsheng Wang Yongsheng Duan Xiangyang Zhang Yongxiang. A NEW EXTRACTION METHOD RESEARCH FOR WEAK FAULT SIGNAL BASED ON IMPROVED FOURIER TRANSFORM[J]. Journal of Vibration and Shock, 2009, 28(8): 172-174