Time-frequency demodulation analysis based on iterative generalized demodulation for fault diagnosis of planetary gearbox under nonstationary conditions
Time-frequency demodulation analysis based on iterative generalized demodulation for fault diagnosis of planetary gearbox under nonstationary conditions
复制标题
基于迭代广义解调的时频解调分析用于行星齿轮箱非平稳故障诊断
DOI：
10.1016/j.ymssp.2015.03.014
复制
发表时间：
2015-10-01
影响因子：
8.4
通讯作者：
Ma, Fei
中科院分区：
文献类型：
--
作者：
Feng, Zhipeng;Chen, Xiaowang;Ma, Fei
行星齿轮箱的振动信号具有调幅和调频特性，因此具有复杂的边带结构。时变速度和/或负载将导致时变特征频率分量。由于调制频率与齿轮故障特征频率有关，因此AM和FM部分各自单独包含齿轮故障的信息。提出了一种时频幅频解调分析方法，避免了复杂的时变边带分析，从而识别出时变齿轮故障特征频率。我们通过迭代广义解调（IGD）来增强时频分析。时变幅度和频率解调谱具有良好的时频分辨率，不受交叉项干扰。它们不涉及复杂的时变边带，从而大大方便了非平稳条件下行星齿轮箱的故障诊断。该方法是使用数值模拟数据和实验信号进行验证。(C)2015爱思唯尔有限公司版权所有。
The vibration signal of planetary gearboxes exhibits the characteristics of both amplitude modulation (AM) and frequency modulation (FM), and thus has a complex sideband structure. Time-varying speed and/or load will result in time variant characteristic frequency components. Since the modulating frequency is related to the gear fault characteristic frequency, the AM and FM parts each alone contains the information of the gear fault. We propose a time-frequency amplitude and frequency demodulation analysis metbhod to avoid the complex time-variant sideband analysis, and thereby identify the time-variant gear fault characteristic frequency. We enhance the time-frequency analysis via iterative generalized demodulation (IGD). The time-varying amplitude and frequency demodulated spectra have fine time-frequency resolution and are free of cross term interferences. They do not involve complex time-variant sidebands, thus considerably facilitating fault diagnosis of planetary gearboxes under nonstationary conditions. The method is validated using both numerically simulated data and experimental signals. (C) 2015 Elsevier Ltd. All rights reserved.