为了解决滚动轴承故障诊断中样本分布差异大、有效故障样本少以及不同故障样本数量不均衡所导致的诊断精度较低的问题;提出基于个性化联邦迁移学习(personalized federated transfer learning,PFTL)的滚动轴承故障诊断方法。在所提出的P...为了解决滚动轴承故障诊断中样本分布差异大、有效故障样本少以及不同故障样本数量不均衡所导致的诊断精度较低的问题;提出基于个性化联邦迁移学习(personalized federated transfer learning,PFTL)的滚动轴承故障诊断方法。在所提出的PFTL中,首先在预训练阶段,将不同分布的各类型故障样本作为联邦学习的各个客户端的输入,并引入贝叶斯层级模型对联邦学习的本地训练和聚合规则进行个性化调整,从而使得预训练模型在避免过拟合问题的同时具有较强的泛化能力;其次引入模型补丁,对预训练模型结构进行调整,并利用目标任务样本对模型进一步微调;最后在CWRU轴承数据集上进行故障诊断实验。实验结果证明所提方法的有效性。展开更多
Knowledge transfer is widely emphasized as a strategic issue for firm competition. A model for intra-firm horizontal knowledge transfer is proposed to model horizontal knowledge transfer to solve some demerits in curr...Knowledge transfer is widely emphasized as a strategic issue for firm competition. A model for intra-firm horizontal knowledge transfer is proposed to model horizontal knowledge transfer to solve some demerits in current knowledge transfer researches. The concept model of intra-firm horizontal knowledge transfer was described and a framework was provided to define the main components of the transfer process. Horizontal knowledge transfer is that knowledge is transferred from the source to the same hierarchical level recipients as the target. Horizontal knowledge transfer constitutes a strategic area of knowledge management research. However, little is known about the circumstances under which one particular mechanism is the most appropriate. To address these issues, some significant conclusions are drawn concerning knowledge transfer mechanisms in a real-world setting.展开更多
文摘为了解决滚动轴承故障诊断中样本分布差异大、有效故障样本少以及不同故障样本数量不均衡所导致的诊断精度较低的问题;提出基于个性化联邦迁移学习(personalized federated transfer learning,PFTL)的滚动轴承故障诊断方法。在所提出的PFTL中,首先在预训练阶段,将不同分布的各类型故障样本作为联邦学习的各个客户端的输入,并引入贝叶斯层级模型对联邦学习的本地训练和聚合规则进行个性化调整,从而使得预训练模型在避免过拟合问题的同时具有较强的泛化能力;其次引入模型补丁,对预训练模型结构进行调整,并利用目标任务样本对模型进一步微调;最后在CWRU轴承数据集上进行故障诊断实验。实验结果证明所提方法的有效性。
文摘Knowledge transfer is widely emphasized as a strategic issue for firm competition. A model for intra-firm horizontal knowledge transfer is proposed to model horizontal knowledge transfer to solve some demerits in current knowledge transfer researches. The concept model of intra-firm horizontal knowledge transfer was described and a framework was provided to define the main components of the transfer process. Horizontal knowledge transfer is that knowledge is transferred from the source to the same hierarchical level recipients as the target. Horizontal knowledge transfer constitutes a strategic area of knowledge management research. However, little is known about the circumstances under which one particular mechanism is the most appropriate. To address these issues, some significant conclusions are drawn concerning knowledge transfer mechanisms in a real-world setting.
