基于故障树的一起“直发断电”故障处置分析  

Analysis on a Fault Treatment of DC Generator Outage Based on Fault Tree

作　　者：赵凯 王志雄 谭巍 罗泽明 Zhao Kai;Wang Zhi-xiong;Tan Wei;Luo Ze-ming(College of Aeronautical Foundation,Naval Aviation University,Yantai 264001,China)

机构地区：[1]海军航空大学航空基础学院,山东烟台264001

出　　处：《内燃机与配件》2023年第15期82-84,共3页Internal Combustion Engine & Parts

摘　　要：针对一起飞机发动机空中“直发断电”即直流发电机断电的故障特情,进行了故障件现场联试、分解检查等操作后返厂检测。本文利用故障树分析方法对故障件开展了故障排查,成功找到故障原因并实现了故障复现,即该型发电机控制盒三极管内部过压保护断电的原因系该型三极管的芯片焊接区域存在大面积散热不良缺陷,导致在使用中热积累不断增大,温度持续升高,最终导致芯片发生大功率过热烧毁。通过返厂维修替换同类型三极管,可以有效避免该型发动机空中“直发断电”故障的再次发生。Aiming at a special fault which is the direct-current generator outage of the aircraft engine in the air,the site combined test and decomposing check are carried out and the fault is checked back to the factory.In this paper,the Fault tree analysis method is used to troubleshoot the faulty parts,and the fault causes are successfully found and the fault recurrence is realized.The reason for the power failure of the internal overvoltage protection of this type of generator control box triode is that there is a large area of poor heat dissipation in the chip welding area of this type of triode,which leads to the continuous increase of heat accumulation and temperature in use,and ultimately leads to the high power overheating and burning of the chip.By returning to the factory for maintenance and replacing the same type of transistor,it can effectively avoid the recurrence of the"DC generator outage"fault of this type of engine in flight.

关 键 词：故障树 电源系统 直发断电 故障处置 

分 类 号：V242.2[航空宇航科学与技术—飞行器设计]