Interval valued Evidence Updating with Reliability and Sensitivity Analysis for Fault Diagnosis
AbstractInformation fusion methods based on Dempster Shafer evidence theory (DST) have been widely used in fault diagnosis. In DST based methods, the monitoring information collected from sensors is modeled as multiple pieces of diagnosis evidence in the form of basic belief assignment (BBA) and Dempster's rule is then used to combine these BBAs to obtain the fused BBA for diagnosis decision making. However, the belief structure with crisp singlevalued belief degrees in BBA may be too coarse to truthfully represent detailed fault information. Moreover, Dempster's rule only uses a static combination process, which is unsuitable for dynamically fusing information collected at different time steps. In order to address these issues, the paper proposes a dynamic diagnosis method based on interval valued evidential updating. First of all, the diagnosis evidence is constructed as an interval valued belief structure (IBS) which provides a more informative scheme than BBA to model fault information. Secondly, th.
Int. J. Comput. Intell. Syst.