Reliability determination of a sounding rocket separation system using its reliability block diagram and FMEA analysis of its spring system

In this paper, reliability block diagram of a sounding rocket separation system is determined and also, FMEA analysis of its spring mechanism is performed. This system is based on the flexible linear shape charge crosssection system and a spring mechanism to accelerate separation. In this investigation, reliability block diagram of the separation system include mechanical and electrical mechanisms is determined. By considering reliability of each component based on expert opinion and using separation system reliability block diagram, reliability of separation system can is determined. Moreover, since spring mechanism if one of the most important parts of separation system, a complete FMEA analysis is done for this mechanism. According to this analysis, piston, cylinder, pin, and springs have the highest RPN number. Hence, these parts must have a high reliability. On the other hand, results are shown that bracket and bush have the lowest RPN number, therefore, it is not important that these parts have a high reliability.