Aiming at the problem that ICA can only be confined to the condition that the number of observed signals is larger than the number of source signals;a single channel blind source separation method combining EEMD, PCA ...Aiming at the problem that ICA can only be confined to the condition that the number of observed signals is larger than the number of source signals;a single channel blind source separation method combining EEMD, PCA and RobustICA is proposed. Through the eemd decomposition of the single-channel mechanical vibration observation signal the multidimensional IMF components are obtained, and the principal component analysis (PCA) is performed on the matrix of these IMF components. The number of principal components is determined and a new matrix is generated to satisfy the overdetermined blind source separation conditions, the new matrix input RobustICA, to achieve the separation of the source signal. Finally, the isolated signals are respectively analyzed by the envelope spectrum, the fault frequency is extracted, and the fault type is judged according to the prior knowledge. The experiment was carried out by using the simulation signal and the mechanical signal. The results show that the algorithm is effective and can accurately diagnose the location of mechanical fault.展开更多
滚动轴承在发生故障时,故障振动信号具有非稳定性、非线性的特点,难以对其中的故障特征进行提取,导致轴承故障诊断的识别率较低。为了提高滚动轴承故障分类的准确率,提出了一种基于集合经验模态分解法(Ensemble Em pirical Mode De com ...滚动轴承在发生故障时,故障振动信号具有非稳定性、非线性的特点,难以对其中的故障特征进行提取,导致轴承故障诊断的识别率较低。为了提高滚动轴承故障分类的准确率,提出了一种基于集合经验模态分解法(Ensemble Em pirical Mode De com pos ition, EEMD)与长短时记忆(Long Short Te rm Me m ory, LSTM)神经网络相结合的滚动轴承故障识别的方法。首先采用EEMD算法将目标振动信号分解成若干个本征模态函数(Intrinsic Mode Function, IMF)分量。然后利用主成分分析法(Principal Component Analysis, PCA)对IMF分量进行降维,选取含有主要故障特征信号的分量。最后计算IMF主成分分量占各自总能量的比例,并将能量比所组成的特征向量作为LSTM神经网络的输入参数进行故障识别。将识别的结果与不同的故障诊断模型所得的结果进行对比分析,仿真结果表明文中所用的方法在轴承故障诊断中准确率更高。展开更多
文摘Aiming at the problem that ICA can only be confined to the condition that the number of observed signals is larger than the number of source signals;a single channel blind source separation method combining EEMD, PCA and RobustICA is proposed. Through the eemd decomposition of the single-channel mechanical vibration observation signal the multidimensional IMF components are obtained, and the principal component analysis (PCA) is performed on the matrix of these IMF components. The number of principal components is determined and a new matrix is generated to satisfy the overdetermined blind source separation conditions, the new matrix input RobustICA, to achieve the separation of the source signal. Finally, the isolated signals are respectively analyzed by the envelope spectrum, the fault frequency is extracted, and the fault type is judged according to the prior knowledge. The experiment was carried out by using the simulation signal and the mechanical signal. The results show that the algorithm is effective and can accurately diagnose the location of mechanical fault.
文摘滚动轴承在发生故障时,故障振动信号具有非稳定性、非线性的特点,难以对其中的故障特征进行提取,导致轴承故障诊断的识别率较低。为了提高滚动轴承故障分类的准确率,提出了一种基于集合经验模态分解法(Ensemble Em pirical Mode De com pos ition, EEMD)与长短时记忆(Long Short Te rm Me m ory, LSTM)神经网络相结合的滚动轴承故障识别的方法。首先采用EEMD算法将目标振动信号分解成若干个本征模态函数(Intrinsic Mode Function, IMF)分量。然后利用主成分分析法(Principal Component Analysis, PCA)对IMF分量进行降维,选取含有主要故障特征信号的分量。最后计算IMF主成分分量占各自总能量的比例,并将能量比所组成的特征向量作为LSTM神经网络的输入参数进行故障识别。将识别的结果与不同的故障诊断模型所得的结果进行对比分析,仿真结果表明文中所用的方法在轴承故障诊断中准确率更高。
