RELIABILITY AND CHECK STUDY OF A FOUR-MODE SYSTEM
4状态可修系统的可靠性和检测策略研究

This paper deals with the reliability and check study of a four-mode system. The system has four modes--normal, abnormal, hidden fault and failure. When the system is in the failure mode, it can be detected without any check. Only after checking can it be known whether the system is in the normal, abnormal or hidden fault. When the system is operating, it is checked once every random time period until it attains the failure mode or it is detected to be in the hidden fault mode by checking. The reliability indices and the optimal checking cycle of the system are obtained by using probability analysis and the supplementary variable technique.