• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2024, Vol. 60 ›› Issue (4): 200-211.doi: 10.3901/JME.2024.04.200

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Health Status Assessment on the Operation Function of Nuclear Power Plants Based on Multi-level Data Fusion

JIANG Xiangyu1, FENG Yixiong1,2, HONG Zhaoxi1,3, HU Bingtao1, SI Hengyuan4, TAN Jianrong1   

  1. 1. State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027;
    2. State Key Laboratory of Public Big Data, Guizhou University, Guiyang 550025;
    3. Ningbo Innovation Center, Zhejiang University, Ningbo 315100;
    4. China Nuclear Power Design Co., Ltd. (Shenzhen), Shenzhen 518172
  • Received:2023-04-06 Revised:2023-11-02 Online:2024-02-20 Published:2024-05-25

Abstract: With the new-generation information technologies and artificial intelligence that are deeply integrated with the industry, the maintenance of industrial systems is moving from the manual regular maintenance to state-based intelligent maintenance(IM). Health status assessment(HSA) is a key link in IM. Systemic states are recognized via the monitored data whereby provide decision support for maintenance. Taking nuclear power plants(NPP) as the research object, an HSA framework is proposed based on multi-level integration of equipment, system, sub-function and function in a multi-department collaboration. Due to equipment groups with numerous state parameters, a weighted average fusion operator based on deviation weighting is proposed to fuse equipment-level parameters, which can timely highlight the abnormal equipment. Considering the different amount of data in different health states, an asymmetric multi-class learning method under imbalanced datasets is proposed to fuse the systems’ health values. The self-learning HSA model is established by the information transfer between multiple health levels, so that the health status of sub-functions can be self-perceived and assessed in a timely manner. The health assessors of multiple sub-functions are fused based on ensemble learning to obtain a macro-level operational function HSA decision. Exemplified with the reactivity function of the NPP, the proposed HAS frame is verified effective.

Key words: industrial system, health status assessment, data fusion, nuclear power plant, state-based maintenance

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