评估诊断证据可靠性的信息融合故障诊断方法  

Information-fusion method for fault diagnosis based on reliability evaluation of evidence

作　　者：徐晓滨[1] 王玉成[1] 文成林[1] 

机构地区：[1]杭州电子科技大学自动化学院,浙江杭州310018

出　　处：《控制理论与应用》2011年第4期504-510,共7页Control Theory & Applications

基　　金：国家自然科学基金资助项目(61004070;60934009;60772006;60874105);浙江省自然科学基金资助项目(Y1080422);中国博士后科学基金资助项目(20100470353)

摘　　要：在基于证据理论的信息融合故障诊断方法中,诊断证据的可靠性高低将会直接影响诊断结果的准确性.而现有的大多数方法并没有全面地评估证据的可靠性,从而常常导致融合诊断结果的不准确.决定证据可靠性的因素主要有传感器的精度与证据获取方法的性能,以及传感器运行环境中的不确定性因素,可将它们分别理解为静态和动态因素.本文利用基于Pignisti。的指标函数优化算法获得静态折扣因子,用其对原证据进行修正;接着提出基于Pignistic向量的证据相似度度量方法获取动态折扣因子,用其对证据进行再次修正,并利用Dempster组合规则融合经两次修正后的证据,得到诊断结果.最后,通过在多功能柔性转子试验台上的实验,验证了所提方法的有效性.In fault diagnosis methods based on evidence theory with information fusion, the reliabilities of evidences will affect the accuracy of diagnosis results. However, most existing fusion diagnosis methods do not take the reliabilities of the evidences into account comprehensively. The main factors which determine the reliability of evidence are the precision of individual sensor and the performance of the method in obtaining the evidence, as well as the uncertainties in the observation environment. They are considered static factors and dynamic factors. The original evidence is first modified by a static discount-factor obtained by optimizing the indication function of Pignistic probability measure. This result is further modified by a dynamic discount-factor which is obtained by applying the measurement method to evidence similarity in Pignistic vectors. Double-modified evidences are combined by Dempster combination rule to obtain the final diagnosis results. Experiments on the multi-functional flexible rotor-testing validate the effectiveness of the proposed method.

关 键 词：故障诊断 信息融合 证据理论 传感器可靠性 折扣因子 

分 类 号：TP202[自动化与计算机技术—检测技术与自动化装置]