关键词: 可靠性建模, 自保护系统, 预防维修, 半再生过程, 策略优化

Abstract: As a kind of self-healing technology, self-protection technology can make the system operate with high reliability under the interference of environments or dynamic working conditions. In this paper, a new reliability model for systems with dependent main and auxiliary units is developed, in which the degradation rate of the main unit depends on the number of operating auxiliary units. In addition, based on the periodic inspection and preventive maintenance strategy, the long-run average cost of the system is derived by the technique of semi-regenerative process and the optimal preventive maintenance strategy of the system is given with the goal of minimizing the long-run average cost. Finally, taking the boring tool system as an example, the optimal values of preventive replacement thresholds and inspection period are given by the proposed method, which is expected to provide a theoretical reference for practical maintenance decision.

Key words: reliability modeling, self-protection system, preventive maintenance, semi-regenerative process, policy optimization