To address the issues of traditional MSE, such as the loss of feature information during the coarse-graining processes and the difficulty in extracting feature information from fault signals at large scale factors, a method for rolling bearing fault diagnosis was proposed based on improved refined composite multiscale sample entropy(IRCMSE) combined with an AOA optimized Bayesian network. The traditional coarse-graining processes, which involved averaging, were replaced with a cross-sampling method to obtain time series at each scale, and the method of calculating entropy values at different scales was changed to extract feature information from the time series. IRCMSE was used to extract the fault feature information of rolling bearings, forming fault feature samples. These fault feature samples were then input into the Bayesian network model optimized by AOA for fault recognition. The improved method is experimentally compared with fault diagnosis methods based on MSE, multiscale dispersion entropy, and refined composite multiscale sample entropy (RCMSE), verifying the feasibility of the proposed method and demonstrating a higher fault recognition rate.
本文采用美国凯斯西储大学(CWRU)提供的电机轴承故障数据验证所提方法的诊断效果。本次实验采用电机驱动端轴承,型号为SKF6205,轴承转速为1797 r /s,采集频率为12 kHz。采用电火花加工对正常轴承进行故障处理,模拟轴承在运行中出现的不同故障类型和故障程度。选择轴承正常和不同故障时的10种振动信号,每种信号50个样本,共500个样本,每个样本信号长度为2048。具体轴承故障数据如表1所示。图6所示为不同故障下振动信号。
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