基于寿命周期备件费用的系统可靠性优化设计

Design on system reliability optimization based on the spare parts' cost of life cycle

针对以往系统可靠性优化研究中,系统费用仅包括研制成本,未考虑系统在列装期间运行费用的问题,应用一种基于寿命周期内备件需求估计的备件费用简易计算方法,对两种非线性可靠性-价格函数情况,以系统组成单元不可修、寿命分布服从指数规律为例,开展了以系统价格和备件费用之和最小为目标的可靠性分配优化研究。仿真试验结果表明:该方法简便易行,得到的优化方案更加合理,能避免单纯追求系统价格最低、却在装备使用阶段付出高昂费用的过度优化结果,能有效降低系统在全寿命期间的运行成本。

There are problems in the previous system reliability optimization study because of system cost only including system price and without considering the system operation cost during the life cycles. We employ a simple calculation method of the spare parts＇ cost based on the estimation for spare parts demand during the whole life cycle, in the condition of two kinds of nonlinear reliability-price function, system composition units being not repaired and units＇ life time obeying exponential distribution, research system reliability allocation optimization as the goal of minimizing the sum of system price and spare parts cost. The simulation results show that the method is simple, convenient and feasible, and can effectively avoid over optimi- zation when only pursuing the lowest system price at the expense of the whole life cycle cost. The system reliability optimization scheme, which based on the spare parts＇ cost of life cycle, can efficaciously reduce system operation cost during the life cycles.