基于EEMD和模糊C均值聚类算法诊断发动机曲轴轴承故障

摘要

For the non-stationary characteristics of diesel vibration signal and fuzzy characteristics of fea-ture parameters,a method of fault diagnosis based on EEMD and Fuzzy C Mean clustering arithmetic is proposed.By decomposing the known-fault samples with EEMD,an initial characteristic vector matrix is obtained.Using a SVD method to the initial vector matrix,these singular values compose the fault feature vector,which is used as the input of FCM after standardization.The optimized classified matrix and clus-tering centers are obtained.Calculating the nearness degree between the unknown-fault samples and the known-fault ones,the fault pattern is identified.Experimental results indicate that this method can effec-tively diagnose the faults of diesel crankshaft bearing.%针对发动机振动信号的非平稳性以及特征参数的模糊性特点,提出了一种基于集合经验模态分解（Ensemble Empirical Mode Decomposition,EEMD）和模糊C均值聚类（Fuzzy Center Mean,FCM）的故障诊断方法,通过对已知故障样本信号进行EEMD分解,形成初始特征向量矩阵;对该矩阵进行奇异值分解,将矩阵的奇异值组成故障特征向量,标准化后作为FCM的输入,得到分类矩阵和聚类中心;最后通过计算待测故障样本与已知故障样本聚类中心的贴近度实现故障模式识别.故障诊断实例表明,该