New dynamic reliability assessment method based on process capability index and fault importance index

Accurate and effective equipment state assessment can help us to keep abreast of equipment operation reliability in performing emergency management of equipment faults. However, the state change of a running system is a dynamic process, and the occurrences of faults are a random process. Therefore, the dynamic characteristics of a system should be identified and real-time data should be used to establish a state evaluation model. This paper proposes a dynamic reliability assessment method of equipment based on process capability index (PCI) and fault importance index (FII) to identify the dynamic performance of equipment, evaluate the stability of process data, and analyze the structural importance of the functional components in the equipment. We present a fault importance calculation method and a comprehensive PCI (CPCI) method based on structural importance. These methods are applied to a synchrotron cooling water system in Shanghai Proton and Heavy Ion Center. Result shows that the dynamic reliability assessment model based on PCI and FII can effectively identify the equipment dynamic reliability change.