飞机起落架收放机构功能可靠性与灵敏度分析

Functional Reliability and Parameter Sensitivity Analysis for Retraction-Extension System of Landing Gear

在ADAMS中建立了某飞机起落架的虚拟样机模型,并对起落架收放机构进行了动力学分析。利用ADAMS的参数化设计功能,综合考虑了作动筒的位置、摩擦系数、外界风速等参数的不确定性,实现了起落架收放机构模型的参数化。通过VB编制的可靠性计算程序不断调用ADAMS,完成了起落架收放机构的功能可靠度与灵敏度分析。分析结果表明:收放机构的失效概率为1.662×10-6;对收放机构功能影响较大的是作动筒位置和摩擦系数,而外界风速的影响很小。

The virtual prototype of a landing gear system is constructed in ADAMS, on which basis a dynamic simulation is carried out during the retraction and extension process of the landing gear. With the help of ADAMS’ parametric design ability,the parametric design of the landing gear is realized wholly considering uncer-tainty of such factors as the locations of the retract actua-tor, friction coefifcients,outer wind rate,etc. Then the paper analyzes the functional reliability and parameter sensitivity of the Retraction-Extension System is analyzed through continuously calling ADAMS by VB program. The results show that the functional failure probability of the Retrac-tion/Extension System is 1.662×10-6 and the locations of the retract actuator and friction coefifcients play much larg-er negative roles than the outer wind rate in the functional performance of the Retraction-Extension System..