基于延拓EMD和GDE识别瞬时阻尼比的行星齿轮箱故障诊断

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (24) : 29-35.

论文

李康强1，冯志鹏2，孙宏图1，神克常1

作者信息 +

Planetary gearbox fault diagnosis via extension EMD and GDE to identify instantaneous damping ratio

LI Kangqiang1，FENG Zhipeng2，SUN Hongtu1，SHEN Kechang1

Author information +

文章历史 +

摘要

瞬时阻尼比可以描述机械系统在运行过程中的能量衰减，而故障产生的能量突变同样反映在瞬时阻尼比的变化波动中。基于此，提出一种通过提取瞬时阻尼比的变化特征来诊断系统故障的方法。首先利用经验模式分解（empirical mode decomposition,EMD）将复杂信号分解为单分量成分以满足生成微分方程（generating differential equation,GDE）算法需求，同时利用对称延拓消除EMD结果的端点效应，根据行星齿轮箱振动信号的特点选取合适的本质模函数（intrinsic mode function,IMF）作为敏感分量。最后利用GDE计算敏感分量的瞬时阻尼比，并根据瞬时阻尼比频谱匹配故障特征频率。仿真结果和实验结果均表明该方法能够有效的诊断行星齿轮箱故障。

Abstract

The instantaneous damping ratio can describe the vibration energy attenuation during mechanical system operation, and it also can reflect the information of energy change. Based on this, a fault diagnosis method is proposed by extracting the characteristics of the instantaneous damping ratio. In order to satisfy the mono-component requirement of generating differential equation (GDE), the signal is firstly decomposed into intrinsic mode function (IMF) components via empirical mode decomposition (EMD) and restrained the end effects in EMD by symmetrical extension. Secondly, according to the characteristics of planetary gearbox vibration signals, we choose a sensitive component for further analysis. Meanwhile, we put forward GDE to calculate the instantaneous damping ratio of sensitive component. Finally, the fault characteristic frequencies are matched according to Fourier spectrum of the instantaneous damping ratio. The proposed method is illustrated by a numerical simulated signal analysis and experimental signal of planetary gearbox.

导出引用

李康强1，冯志鹏2，孙宏图1，神克常1. 基于延拓EMD和GDE识别瞬时阻尼比的行星齿轮箱故障诊断[J]. 振动与冲击, 2021, 40(24): 29-35

LI Kangqiang1，FENG Zhipeng2，SUN Hongtu1，SHEN Kechang1. Planetary gearbox fault diagnosis via extension EMD and GDE to identify instantaneous damping ratio[J]. Journal of Vibration and Shock, 2021, 40(24): 29-35

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