A novel method for the optimal band selection for vibration signal demodulation and comparison with the Kurtogram
A novel method for the optimal band selection for vibration signal demodulation and comparison with the Kurtogram
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DOI：
10.1016/j.ymssp.2010.05.018
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发表时间：
2011-01-01
影响因子：
8.4
通讯作者：
Jablonski, Adam
中科院分区：
文献类型：
--
作者：
Barszcz, Tomasz;Jablonski, Adam
振动信号的窄带幅度解调使得能够提取携带关于旋转机械故障的信息的分量。然而，解调信号的质量取决于为解调选择的频带。谱峰度（SK）被证明是一个非常有效的方法来检测这类故障，包括有缺陷的滚动轴承和齿轮III。虽然有条件下，SK产生有效的结果，也有情况下，当它失败，例如，在存在一个相对较强的，非高斯噪声包含高峰值或相对较高的重复率的故障impuls.In本文中，一种新的方法选择的最佳频带，试图克服上述缺点，提出。随后，提出了一种新的工具，用于呈现的方法，称为投影图的结果。该方法基于解调信号的包络谱幅度的峰度，而不是基于滤波后的时间信号的峰度。该方法的优点是能够检测到更小的信噪比相比，基于SK的快速Kurtogram的瞬态。仿真和真实的数据，包括一个测试台，一个模拟信号，和喷气发动机振动信号的应用程序验证所提出的方法。(C)2010爱思唯尔有限公司版权所有。
The narrowband amplitude demodulation of a vibration signal enables the extraction of components carrying information about rotating machine faults. However, the quality of the demodulated signal depends on the frequency band selected for the demodulation. The spectral kurtosis (SK) was proved to be a very efficient method for detection of such faults, including defective rolling element bearings and gears Ill. Although there are conditions, under which SK yields valid results, there are also cases, when it fails, e.g. in the presence of a relatively strong, non-Gaussian noise containing high peaks or for a relatively high repetition rate of fault impulses.In this paper, a novel method for selection of the optimal frequency band, which attempts to overcome the aforementioned drawbacks, is presented. Subsequently, a new tool for presentation of results of the method, called the Protrugram, is proposed. The method is based on the kurtosis of the envelope spectrum amplitudes of the demodulated signal, rather than on the kurtosis of the filtered time signal. The advantage of the method is the ability to detect transients with smaller signal-to-noise ratio comparing to the SK-based Fast Kurtogram. The application of the proposed method is validated on simulated and real data, including a test rig, a simulated signal, and a jet engine vibration signal. (C) 2010 Elsevier Ltd. All rights reserved.