中文摘要：

为一个可修理的多状态系列平行系统(RMSPS ) 的不同图案的可获得性等价在这份报纸被讨论。系统部件被假定独立，并且他们的失败和修理评价不变。系统可获得性被定义为系统的能力满足消费者需求。因素改进方法和待机冗余性方法被用来改进系统设计。评估原来、改进的系统的可获得性，基于通用产生功能，一种快技术被采用。可获得性等价因素被介绍比较不同系统图案。系统的可获得性等价因素的二种类型被导出。一个数字例子被提供说明怎么利用获得的结果。

英文摘要：

The availability equivalence of different designs for a repairable multi-state series-parallel system （RMSPS） is discussed in this paper. The system components are assumed to be independent, and their failure and repair rates to be constant. The system availability is defined as the ability of the system to satisfy consumer demand. Factor improvement method and standby redundancy method are used to improve the system design. To evaluate availability of the both original and improved systems, a fast technique, based on universal generating function, is adopted. The availability equivalence factor is introduced to compare different system designs. Two types of availability equivalence factors of the system are derived. A numerical example is provided to illustrate how to utilize the obtained results.