轴承故障类型复杂,并且在不同工况下每种故障类型都很难获得足够的训练样本。因此,本文提出一种基于深度神经网络的小样本学习分类算法,引入第1层具有宽卷积核网络(Convolutional neural network with training interference,TICNN)作...轴承故障类型复杂,并且在不同工况下每种故障类型都很难获得足够的训练样本。因此,本文提出一种基于深度神经网络的小样本学习分类算法,引入第1层具有宽卷积核网络(Convolutional neural network with training interference,TICNN)作为孪生网络的子网络用于提取特征,减少工业环境噪声影响。孪生网络是一种常用于小样本学习的结构,通过输入相同或不同类别的样本对进行训练,学习不同属性样本与特征之间的映射关系,并采用相似度进行度量。测试样本通过寻找最近邻的类别来实现分类。在标准凯斯西储大学轴承故障诊断基准数据集上的实验结果表明,在数据有限的情况下,本文模型在故障诊断中表现出更好的效果。当使用最少的训练数据在不同的噪声环境中进行测试时,本文小样本学习模型的性能超过了具有合理噪声水平的基线模型,故障诊断准确率达到了94.41%。当在具有新故障类型或新工作条件的测试集上进行评估时,本文模型仍然有效。展开更多
Aiming at the non-stationary feattwes of the roller bearing fault vibration signal, a roller bearing fault diagnosis methtxt based on improved Local Mean Decomposition （LMD） and Support Vector Machine （SVM） is pro...Aiming at the non-stationary feattwes of the roller bearing fault vibration signal, a roller bearing fault diagnosis methtxt based on improved Local Mean Decomposition （LMD） and Support Vector Machine （SVM） is proposed. In this paper, firstly, the wavelet analysis is introduced to the signal decomposition and reconstruction; secondly, the LMD method is used to decompose the recomtnion signal obtained by the wavelet analysis into a ntmaber of Product Ftmctions （PFs） that include main fault characteristics, thus, the initial feattwe vector matrixes could be formed automatically; Thirdly, by applying the Singular Valueition （SVD） techniques to the initial feature vector matrixes, the singular values of the matrixes can be obtained, which can be used as the fault feature vectors of the roller bearing and serve as the input vectors of the SVM classifier; Finally, the recognition results can be obtained from the SVM output. The results of analysis show that the propsed method can be applied to roller beating fault diagnosis effectively.展开更多
文摘轴承故障类型复杂,并且在不同工况下每种故障类型都很难获得足够的训练样本。因此,本文提出一种基于深度神经网络的小样本学习分类算法,引入第1层具有宽卷积核网络(Convolutional neural network with training interference,TICNN)作为孪生网络的子网络用于提取特征,减少工业环境噪声影响。孪生网络是一种常用于小样本学习的结构,通过输入相同或不同类别的样本对进行训练,学习不同属性样本与特征之间的映射关系,并采用相似度进行度量。测试样本通过寻找最近邻的类别来实现分类。在标准凯斯西储大学轴承故障诊断基准数据集上的实验结果表明,在数据有限的情况下,本文模型在故障诊断中表现出更好的效果。当使用最少的训练数据在不同的噪声环境中进行测试时,本文小样本学习模型的性能超过了具有合理噪声水平的基线模型,故障诊断准确率达到了94.41%。当在具有新故障类型或新工作条件的测试集上进行评估时,本文模型仍然有效。
基金supported by Chinese National Science Foundation Grant(No.50775068)China Postdoctoral Science Foundation funded project(No.20080430154)High-Tech Research and Development Program of China(No.2009AA04Z414)
文摘Aiming at the non-stationary feattwes of the roller bearing fault vibration signal, a roller bearing fault diagnosis methtxt based on improved Local Mean Decomposition （LMD） and Support Vector Machine （SVM） is proposed. In this paper, firstly, the wavelet analysis is introduced to the signal decomposition and reconstruction; secondly, the LMD method is used to decompose the recomtnion signal obtained by the wavelet analysis into a ntmaber of Product Ftmctions （PFs） that include main fault characteristics, thus, the initial feattwe vector matrixes could be formed automatically; Thirdly, by applying the Singular Valueition （SVD） techniques to the initial feature vector matrixes, the singular values of the matrixes can be obtained, which can be used as the fault feature vectors of the roller bearing and serve as the input vectors of the SVM classifier; Finally, the recognition results can be obtained from the SVM output. The results of analysis show that the propsed method can be applied to roller beating fault diagnosis effectively.
