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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.
The power plant of a large-scale system consists of three engines. There are two kinds of design schemes of the power plant: two sets of reserve running at rated power, one cold backup plan of switching over reserve engine after failure and three sets of simultaneous power reduction work, The other two power-down scenarios with rated power after a single fault.Under the assumption that each engine’s life obeys Weibull distribution, a reliability model is established for each of these two schemes, and based on the rated power and the reduced power The lifetime distribution of the engine is given, respectively, given the reliability of the power plant under these two design scenarios with time curve.Secondly, according to these two different scenarios under the curve of reliability with time, select the power plant engine The best optimization plan of the group.Finally, an example is given to illustrate the feasibility of this method.