Fault Detection of Sun Gear Based on Magnetic Encoder and Narrow Band Demodulation

被引：0
|
作者：
Yin X. [1 ]
Guo Y. [1 ]
Li Z. [1 ]
Hua J. [1 ]
机构：
[1] Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming
来源：
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | 2024年 / 44卷 / 02期
关键词：
instantaneous angular speed signal; magnetic encoder; narrow band demodulation; planetary gearbox; rotation domain averaging;
D O I：
10.16450/j.cnki.issn.1004-6801.2024.02.022
中图分类号：
学科分类号：
摘要：
Instantaneous angular speed (IAS) -based planetary transmission fault detection can effectively overcome the transmission path problem existing in the traditional vibration signal-based analysis method, which has attracted much attention. Conversely, the absolute magnetic encoder has the advantages of low price and convenient installation, which is suitable for engineering application, however, its angle signal is significantly affected by measurement error under low speed conditions, so it is necessary to simulate the angle signal so as to eliminate the interference caused by measurement error. The traditional segment fitting method tends to result in discontinuity at the segment point. Such discontinuity leads to false impacts in the IAS signal calculated by it, interfering with the fault feature extraction based on the IAS signal. In this paper, a sun gear fault detection method based on IAS estimation and narrowband demodulation of absolute magnetic encoder is proposed. Firstly, in order to ensure the continuity and smoothness of IAS signal, a method based on least square fitting and five times Hermite interpolation is proposed to realize the fitting estimation and smoothing of the IAS signal. Secondly, building on this foundation and in conjunction with narrowband demodulation technology, the fault characteristics of the sun gear in the planetary gear reducer are effectively extracted. Finally, the effectiveness of the proposed method is verified by analyzing and comparing the signals from the absolute magnetic encoder of both normal and faulty sun gears. © 2024 Nanjing University of Aeronautics an Astronautics. All rights reserved.
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页码：365 / 371
页数：6
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