Journal of Xidian University ›› 2022, Vol. 49 ›› Issue (6): 152-163.doi: 10.19665/j.issn1001-2400.2022.06.018

• Computer Science and Technology & Artificial Intelligence • Previous Articles     Next Articles

Edge-cloud collaborative transfer of process knowledge for digital manufacturing monitoring

CAO Xincheng1(),YAO Bin1(),HE Wangpeng2(),CHEN Binqiang1(),QING Tao1()   

  1. 1. School of Aerospace Engineering,Xiamen University,Xiamen 361005,China
    2. School of Aerospace Science and Technology,Xidian University,Xi’an 710071,China
  • Received:2021-10-08 Online:2022-12-20 Published:2023-02-09

Abstract:

Intelligent manufacturing is the inevitable trend in the development of high-end equipment,and intelligent operation and maintenance are of great significance for ensuring the quality and reliability of digital processing.In the discrete intelligent manufacturing process,process diversity is the key bottleneck restricting the construction and implementation of digital models for intelligent operation and maintenance.This paper proposes an edge-cloud collaborative process knowledge migration scheme,which integrates edge computing and cloud computing to realize the rapid evolution of intelligent operation and maintenance models.First,a parallel multi-scale convolutional network (PMsCNN) in the cloud is trained to abstractly model the degradation process of the equipment under the historical process plan.Then,the unlabeled data samples under the new process plan is used to carry out transfer learning,so that PMsCNN can adapt to the new process plan.For this reason,an improved maximum mean difference loss function is proposed to overcome the problem of data imbalance.Finally,the evolved PMsCNN is applied to edge devices,and intelligent device operation and maintenance are implemented online.By taking the performance operation and maintenance of the equipment core and basic parts as a research case,the advanced nature of the proposed process knowledge migration scheme is verified.Compared with the existing monitoring method based on deep learning,the test accuracy rate under the new process scheme is improved by more than 20%,which is better than that of the existing migration diagnosis method.

Key words: condition monitoring, transfer learning, edge-cloud collaboration, parallel multi-scale convolutional network, performance degradation

CLC Number: 

  • TH17