The actuating cylinder of the aircraft main landing door is composed of actuating cylinder,pull rod,bracket,etc.,which realizes the function of opening and closing the main landing gear door and preventing air from sucking open the door.The bracket is the transmission component for opening and closing the main landing gear door.Cracks,crack instability and crack propagation are easy to occur at the intersection of the floor and the upper face of the cylinder due to stress concentration or insufficient strength.This paper carries out the stress cloud map analysis of the working condition of the support,revealing that the weak part is the intersection of the floor plate and the cylinder surface,and establishing a fault tree for the cracks of the support.It is determined that the main causes of crack initiation and propagation are insufficient minimum limit margin and small local wall thickness of the ribs after machining.In order to further facilitate the analysis and troubleshooting of such faults,the fault tree can be established for the crack failure of the actuator support of the main hatch door,the fault troubleshooting plan can be perfected,the aircraft landing gear service support manual can be established,and the landing gear resource database with information sharing can be established.
关键词
主起舱门/收放作动筒/支架/肋板裂纹/交变载荷/故障树/故障分析
Key words
main hatch door/actuating cylinder/support/cracks in the floor/alternating load/fault tree/fault analysis
维普
万方数据