Vibration and current transient monitoring for gearbox fault detection using multiresolution Fourier transform
Vibration and current transient monitoring for gearbox fault detection using multiresolution Fourier transform
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DOI：
10.1016/j.jsv.2007.08.023
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发表时间：
2008-03-18
影响因子：
4.7
通讯作者：
Mohanty, A. R.
中科院分区：
文献类型：
--
作者：
Kar, Chinmaya;Mohanty, A. R.
本文对多级齿轮箱在瞬态载荷作用下的故障诊断进行了实验研究。感应电动机驱动多级齿轮箱，多级齿轮箱与直流发电机连接，用于加载。所研究的信号是振动瞬态，由安装在齿轮箱尾端轴承上的加速度计记录；以及感应电动机所产生的瞬时电流。研究了三种缺陷情况和三种暂态负载情况。采用先进的信号处理技术，如离散小波变换（DWT）和修正的多分辨率傅立叶变换（MFT）来研究振动和电流瞬态。从振动瞬态分析可以看出，卸荷是一种高频现象。随着缺陷严重程度的增加，不仅缺陷齿轮啮合频率获得能量，而且在低频区域出现较大的冲击能量。然而，在电流瞬态中，虽然负载去除是一种低频现象，但在高频区域观察到非常小的瞬态。随着缺陷严重程度的增加，能量分布到齿轮啮合频率的侧带，跨越供应线频率。为了找出缺陷检测的趋势，提出了一种统计特征提取技术。设计了一种状态监测方案，可以方便地监测齿轮箱在瞬态负荷和缺陷同时存在时的振动和电流瞬态。(C) 2007 Elsevier Ltd.版权所有。
This paper deals with an experimental investigation of fault diagnosis in a multistage gearbox under transient loads. An induction motor drives the multistage gearbox, which is connected to a DC generator for loading purpose. The signals studied are the vibration transients, recorded from an accelerometer fitted at the tail-end bearing of the gearbox; and the current transients drawn by the induction motor. Three defective cases and three transient load conditions are investigated. Advanced signal processing techniques such as discrete wavelet transform (DWT) and a corrected multiresolution Fourier transform (MFT) are applied to investigate the vibration and current transients. It is observed from the vibration transients that the load removal is a high-frequency phenomenon. With increase in defect severity, not only the defective gear mesh frequency gains energy, but also large impact energy appears in low-frequency regions. Whereas in the current transients, though load removal is a low-frequency phenomenon, a very small transient is observed at high-frequency regions for defective gears. With increase in defect severity, energy is distributed to the sidebands of the gear mesh frequency across supply line frequency. A statistical feature extraction technique is proposed in order to find a trend in detection of defects. A condition monitoring scheme is devised that can facilitate in monitoring vibration and current transients in the gearbox with simultaneous presence of transient loads and defects. (C) 2007 Elsevier Ltd. All rights reserved.