CAJ | 학술논문

针对航天复杂产品单点失效模式辨识和控制不充分的问题，介绍了一种运载火箭伺服机构单点失效分析方法。该方法将伺服机构按功能划分为能源、控制和负载力传递回路，每个回路再划分4个子回路，即基本功能子回路、机械连接子回路、电气连接子回路和密封子回路；再根据每个子回路的可靠性框图，判别单点失效环节。研究表明，此方法具备故障树（ FTA）的自顶向下的分析路径和故障模式影响分析（ FMEA ）中的可靠性框图的判别逻辑，且重点考虑了传统分析中易忽视的连接附件，适用于复杂机电产品的单点失效分析。此方法已经在执行我国载人交会对接任务中得到应用，对于工程人员和年轻员工的培训也有借鉴价值和指导作用。
침대항천복잡산품단점실효모식변식화공제불충분적문제，개소료일충운재화전사복궤구단점실효분석방법。해방법장사복궤구안공능화분위능원、공제화부재력전체회로，매개회로재화분4개자회로，즉기본공능자회로、궤계련접자회로、전기련접자회로화밀봉자회로；재근거매개자회로적가고성광도，판별단점실효배절。연구표명，차방법구비고장수（ FTA）적자정향하적분석로경화고장모식영향분석（ FMEA ）중적가고성광도적판별라집，차중점고필료전통분석중역홀시적련접부건，괄용우복잡궤전산품적단점실효분석。차방법이경재집행아국재인교회대접임무중득도응용，대우공정인원화년경원공적배훈야유차감개치화지도작용。
In order to solve the problem of insufficient identification and control for Single Point Failure ( SPF) in complex space products , a SPF analysis method and its application in servo-mech-anisms in launch vehicles were introduced .In top layer, a servo-mechanism was decomposed to 3 circuits in series , namely , hydraulic power , servo control , and loading .Each circuit was further de-composed to 4 sub circuits in series, namely, basic function, mechanical connection, electrical con-nection, and seals.In each sub circuit, the Reliability Block Diagram (RBD) was plotted and SPFs were identified .This method could be seen as a new combination of skills of the top-down approach from Fault Tree Analysis ( FTA) and the RBD graphical reasoning from Failure Mode Effects Analy-sis (FMEA).Another merit is that it extends the traditional functional fault analysis to auxiliaries which were easily ignored .The method has been applied in China ’ s manned Rendezvous and Docking missions and can serve as a reference for both rookies and veteran engineers .