基于系统可靠度的发动机组方案优化选择方法

某大型系统的动力装置由三台发动机构成,动力装置的设计方案有2种:两台以额定功率运行一台贮备,一台故障后切换贮备发动机的冷储备方案和三台同时降功率工作,一台故障后另两台以额定功率运行的降功率方案.假设每台发动机寿命服从威布尔分布的情况下,对这两种方案分别建立了可靠性模型,并依据额定功率和降功率下的发动机的寿命分布,分别给出在这两种设计方案下的动力装置的可靠度随时间变化的曲线.然后,根据这两种不同方案下可靠度随时间变化的曲线,选择此动力装置的发动机组的最佳优化方案.最后,给出实例说明此方法的可行性.

Optimization method of schemes of engine groups based on system reliability

The power equipment of a large system consists of three engines,which has two kinds of design scheme: cold standby and down-rating.The cold standby design scheme is that two engines run in power rating and the left one is reserved;after one failure,the cold reserved engine is switched.Yet the down-rating design scheme is that three engines work at the same time,once one fails,the other two run in power rating.On condition that each engine's life distribution follows the different Weibull distributions,the r...