Rolling bearings are important central components in rotating machines, whose fault diagnosis is crucial in condition-based maintenance to reduce the complexity of different kinds of faults. To classify various rollin...Rolling bearings are important central components in rotating machines, whose fault diagnosis is crucial in condition-based maintenance to reduce the complexity of different kinds of faults. To classify various rolling bearing faults, a prognostic algorithm consisting of four phases was proposed. Since stacked denoising auto-encoder can be filtered, noise of large numbers of mechanical vibration signals was used for deep learning structure to extract the characteristics of the noise. Unsupervised pre-training method, which can greatly simplify the traditional manual extraction approach, was utilized to process the depth of the data automatically. Furthermore, the aggregation layer of stacked denoising auto-encoder(SDA) was proposed to get rid of gradient disappearance in deeper layers of network, mix superficial nodes’ expression with deeper layers, and avoid the insufficient express ability in deeper layers. Principal component analysis(PCA) was adopted to extract different features for classification. According to the experimental data of this method and from the comparison results, the proposed method of rolling bearing fault classification reached 97.02% of correct rate, suggesting a better performance than other algorithms.展开更多
协同过滤推荐和基于内容的推荐是目前应用于推荐系统中的两种主流手段.传统的协同过滤模型存在着矩阵稀疏问题,基于内容的推荐又不能自动抽取深层特征,且两种推荐手段很难直接融合在一起,无法共同提升推荐系统的性能表现.充分利用了深...协同过滤推荐和基于内容的推荐是目前应用于推荐系统中的两种主流手段.传统的协同过滤模型存在着矩阵稀疏问题,基于内容的推荐又不能自动抽取深层特征,且两种推荐手段很难直接融合在一起,无法共同提升推荐系统的性能表现.充分利用了深度学习模型能够深度挖掘内容隐藏信息的特性,将栈式降噪自编码器(SDAE)运用于基于内容的推荐模型中,并将其与基于标签的协同过滤算法结合在一起,提出DLCF(Deep Learning for Collaborative Filtering)算法.经过真实数据集的验证,DLCF算法能够很大程度上克服矩阵稀疏问题,在性能上优于传统推荐算法.展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No.51704138)
文摘Rolling bearings are important central components in rotating machines, whose fault diagnosis is crucial in condition-based maintenance to reduce the complexity of different kinds of faults. To classify various rolling bearing faults, a prognostic algorithm consisting of four phases was proposed. Since stacked denoising auto-encoder can be filtered, noise of large numbers of mechanical vibration signals was used for deep learning structure to extract the characteristics of the noise. Unsupervised pre-training method, which can greatly simplify the traditional manual extraction approach, was utilized to process the depth of the data automatically. Furthermore, the aggregation layer of stacked denoising auto-encoder(SDA) was proposed to get rid of gradient disappearance in deeper layers of network, mix superficial nodes’ expression with deeper layers, and avoid the insufficient express ability in deeper layers. Principal component analysis(PCA) was adopted to extract different features for classification. According to the experimental data of this method and from the comparison results, the proposed method of rolling bearing fault classification reached 97.02% of correct rate, suggesting a better performance than other algorithms.
文摘协同过滤推荐和基于内容的推荐是目前应用于推荐系统中的两种主流手段.传统的协同过滤模型存在着矩阵稀疏问题,基于内容的推荐又不能自动抽取深层特征,且两种推荐手段很难直接融合在一起,无法共同提升推荐系统的性能表现.充分利用了深度学习模型能够深度挖掘内容隐藏信息的特性,将栈式降噪自编码器(SDAE)运用于基于内容的推荐模型中,并将其与基于标签的协同过滤算法结合在一起,提出DLCF(Deep Learning for Collaborative Filtering)算法.经过真实数据集的验证,DLCF算法能够很大程度上克服矩阵稀疏问题,在性能上优于传统推荐算法.
