基于冲击信号的滑动轴承摩擦故障监测方法

发布时间：2018-06-02 17:53

本文选题：滑动轴承 + 摩擦故障　；参考：《航空动力学报》2017年09期

【摘要】：针对滑动轴承声发射(AE)信号干扰严重、故障信号难分离、轴承摩擦故障监测难的问题,从不同信号的激励源作用形式出发,根据冲击信号的工作脉冲特征,建立了分离相对容易的干扰信号与轴承摩擦故障的联系,提出一种基于干扰信号监测滑动轴承故障的方法。首先,依靠K均值奇异值分解(K-SVD)字典对冲击特征的捕捉能力,确定冲击脉冲产生的时刻;为了锐化和增强冲击信号,通过Hilbert包络解调出冲击包络信号。其次,引入钟形脉冲参数,通过钟形脉冲拟合单个冲击包络信号,并进一步推导出冲击包络信号的强度简化计算公式,用于滑动轴承接触摩擦故障识别。最后通过实验模拟了滑动轴承切断供油后的轴瓦摩擦过程,与AE传统特征相比,所提特征更容易识别轴承的早期摩擦故障,能够完整描述轴承的摩擦的全过程,且计算效率更高,为滑动轴承接触摩擦故障诊断提供了一种新的途径。
[Abstract]:Aiming at the problems of serious interference of acoustic emission (AE) signals of sliding bearings, difficulty in separating fault signals and difficulty in monitoring the friction faults of bearings, according to the working pulse characteristics of shock signals, the excitation sources of different signals are taken into account. The relationship between the relatively easy separation of interference signals and bearing friction faults is established and a method for monitoring sliding bearing faults based on interference signals is proposed. Firstly, the moment of impulse generation is determined by the K-SVD dictionary's ability to capture impact characteristics, and the impulse envelope signal is demodulated by Hilbert envelope in order to sharpen and enhance the impact signal. Secondly, the bell-shaped pulse parameters are introduced to fit a single impulse envelope signal, and a simplified formula for calculating the strength of the impact envelope signal is derived, which is used to identify the contact friction fault of sliding bearing. Finally, the friction process of bearing after cutting off oil supply is simulated experimentally. Compared with AE traditional feature, the proposed feature is easier to identify the early friction fault of bearing, and can describe the whole process of bearing friction completely. The calculation efficiency is higher, which provides a new way for the contact friction fault diagnosis of sliding bearing.
【作者单位】：军械工程学院车辆与电气工程系;中国白城兵器试验中心;中国人民解放军32146部队;中国人民解放军65185部队;
【基金】：国家自然科学基金(51205405,51305454)
【分类号】：TH133.31

【相似文献】