Abstract:

To apply prognostics and health management (PHM) technology in realistic engineering, a method of PHM based on availability model is proposed. Firstly, the hardware and software model of the basic unit and its healthy state transition diagram are established by generalized stochastic Petri nets (GSPN) and continuous time Markov chain (CTMC). The availability of the basic unit could be calculated by sloving differential equations. Combining the relationship of the hardware and software faults, the unit availability model is obtained. Based on event scheduling simulation, the result of the basic unit availability is achieved. Finally, a comparison is made between the failure model of the basic uint and the model of repairable system theory, the “availability-failure rate-maintenance rate” calculation model is obtained and is applied for PHM analysis in engineering.