电工技术学报
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基于模型融合的电子元器件个体剩余寿命预测方法
赵昌东1,2, 项石虎1,2, 王尧1,2
1.省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学)天津 300130;
2.河北省电磁场与电器可靠性重点实验室(河北工业大学)天津 300130
Individual residual life prediction method of electronic components based on model fusion
Zhao Changdong1,2, Xiang Shihu1,2, Wang Yao1,2
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China
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摘要 电子元器件通常为整个系统中较易发生故障的薄弱环节,并且往往承担着较为关键的任务,一旦未及时更换引发故障,可能会导致整个系统的失效。因此对系统中电子元器件的剩余寿命进行精准预测至关重要。由于失效机理复杂、先验信息不充分、监测数据不足等原因,电子元器件的退化模型存在不确定性问题,会对剩余寿命的预测结果产生较大的影响。针对模型不确定性问题,现有研究未考虑模型的预测能力,且需要大量的先验信息或退化数据。为解决上述问题,本文提出了一种基于模型融合的电子元器件剩余寿命预测方法。具体而言,本文提出了一种综合考虑了模型的拟合能力、复杂度与预测精度的新模型优劣性指标,并依据新指标构造了各备选模型为真实模型的概率,进而利用全概率公式对所有备选模型进行融合,最后通过融合模型求解出电子元器件个体的剩余寿命。经实际案例分析,验证了本文所提出方法的有效性和精确性。
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关键词 电子元器件个体剩余寿命预测模型不确定性模型优劣性指标模型融合    
Abstract:Electronic components are usually the weak parts of a system, and they are generally required to fulfill critical tasks. If a seriously degraded electronic component is not replaced in time, its failure may result in the failure of the whole system. Therefore, it is significant to accurately predict the residual life of electronic components in the system. Due to factors such as complex failure mechanism, little prior information, and insufficient monitoring data, the degradation model of an electronic component is usually uncertain, which may cause an inaccurate prediction of the residual life. For the problem of the model uncertainty, the existing studies did not consider the predictive ability of a model, and required abundant prior information or degradation data. To solve this problem, a residual life prediction method for an individual electronic component based on model fusion is proposed in this paper. Generally speaking, alternative models are fused based on a novel model evaluation index that incorporates the fitting ability, complexity, and prediction accuracy of a model, and then the residual life of an electronic component is predicted based on the fused model.
The proposed residual life prediction method is focused on the case that the performance of an electronic component can be characterized by a single performance parameter. Firstly, the set of alternative degradation models is established for typical and common degradation patterns of electronic components. Secondly, the set of alternative residual life distribution models is derived based on the set of alternative degradation models. Thirdly, the maximum likelihood estimation method is adopted to estimate the unknown parameters in the alternative models by utilizing the available degradation data collected up to the current time. Fourthly, the probability that an alternative model is the true one is constructed according to the proposed novel model evaluation index, and then the alternative residual life distribution models are fused via the law of total probability to obtain the fused model of the residual life distribution. Fifthly, the expected residual life is taken as the point estimate of the residual life, and it is calculated based on the fused residual life distribution model.
Three real cases are carried out to demonstrate the effectiveness and practicability of the proposed residual life prediction method. Through comparison analysis, it is shown that the proposed method is superior to the methods that predict the residual life based on the best model selected according to a traditional model evaluation index, such as Akaike information criterion (AIC) and the value of the likelihood function, or the proposed index. Moreover, it is verified that the proposed method can ensure a favorable prediction accuracy, even if the regularity of the degradation data is poor and the amount of the data is small.
Some specific conclusions are summarized as follows. 1) The proposed novel model evaluation index is a comprehensive index, since it simultaneously takes the fitting ability, complexity, and prediction accuracy of a model into account. 2) The strategy of model fusion can not only reduce the risk of abandoning a model with better prediction result but also lead to a fused model that has the characteristics of all the alternative models, which can overcome the drawbacks of using a single model to a certain extent. 3) The proposed residual life prediction method for electronic components does not depend on a large amount of prior information or degradation data, and has a high prediction accuracy and a powerful practicability.
Key wordsElectronic component    individual residual life prediction    model uncertainty    model evaluation index    model fusion   
    
PACS: TB114.3  
基金资助:国家自然科学基金(72101081, 51937004)和中央引导地方科技发展资金(226Z2102G)资助项目
通讯作者: 项石虎 男,1992年生,博士,研究方向为电器可靠性等。E-mail:2020070@hebut.edu.cn   
作者简介: 赵昌东 男,1997年生,硕士研究生,研究方向为电器可靠性等。E-mail:1159732872@qq.com
引用本文:   
赵昌东, 项石虎, 王尧. 基于模型融合的电子元器件个体剩余寿命预测方法[J]. 电工技术学报, 0, (): 48-48. Zhao Changdong, Xiang Shihu, Wang Yao. Individual residual life prediction method of electronic components based on model fusion. Transactions of China Electrotechnical Society, 0, (): 48-48.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.221359          https://dgjsxb.ces-transaction.com/CN/Y0/V/I/48