Spacecraft Reliability Design

Abstract

This chapter presents the general reliability design contents such as modeling, allocation, prediction, margin design, derating design, fault-tolerant design, failure mode and effects analysis (FMEA), fault tree analysis (FTA), event tree analysis (ETA), probabilistic risk assessment (PRA), sneak circuit analysis (SCA), worst case analysis (WCA), outage analysis, reliability mathematical simulation and reliability evaluation. Since the 1990s, the reliability design has been improved from the "design in reliability" in the engineering development stage to the "design for reliability" in the conceptual design stage. The reliability requirements of a spacecraft product include qualitative requirements and quantitative requirements. The reliability allocation and the reliability prediction are mutually iterated and constantly improved. The mission reliability model includes a reliability block diagram and the corresponding reliability mathematical model. The reliability prediction of a spacecraft system can be divided into basic reliability prediction and mission reliability prediction.