某民用飞机主起上位锁开锁压力过大问题分析与解决

Analysis and Solution on the Over Pressure of the Main Landing Gear Uplock for a Civil Aircraft

在某新型民用飞机起落架收放研发试验中,发现主起落架上位锁开锁压力过大的问题,针对问题进行了理论分析,认为主起落架放下时,油液同时到达收放作动筒和上位锁开锁作动筒,但由于收放作动筒油液作用面积大于上位锁开锁作动筒油液作用面积,使得收放作动筒在上位锁开锁前将力施加到上位锁上,并通过试验验证了此分析结论的正确性,为改进设计方案提供了试验依据。

In the landing gear retraction development test of a civil aircraft,it is found that the unlocking pressure of the uplock of the main landing gear is too large.According to the theoretical analysis of the problem,it is considered that when the main landing gear is put down,the oil reaches the retraction actuator and the uplock unlocking actuator at the same time.However,because the oil area of the retraction actuator is larger than that of the upper lock unlocking actuator,the actuator applies the force to the uplock first before the uplock is unlocked,and the following test verifies the correctness of the analysis conclusion,which provides the test basis for improving the design scheme.