某起落架收放联动机构故障分析及改进设计

结合某起落架收放试验中出现的收放机构变形卡滞问题,分析了机构受载情况并得出了机构故障机理。分别利用ADAMS和LMS virtual.lab建立了起落架刚柔耦合模型,采用刚柔耦合动力学仿真方法分析了装配间隙对结构变形的影响。研究表明,机构设计造成的附加弯矩和装配间隙是造成收放机构变形卡滞的主要原因。提出了改进设计方案并进行了刚柔耦合仿真验证分析。结果表明:新方案很好地解决了机构中传动部件受力不合理的问题,且关键部件的变形也减小到不足0.05mm,解决了该收放机构的变形卡滞问题。

Failure Analysis and Improved Design of a Landing Gear Retraction Mechanism

During the tests of a landing gear, the retraction mechanism got stuck due to the serious mechanism deformation. Aiming at this problem, the mechanism's load conditions were analyzed and the failure causes were obtained. The rigid-flexible coupling models were established using ADAMS as well as LMS virtual. lab. By the rigid-flexible coupling dynamics simulation method, it is concluded that how the assembling gap affects the mechanism deformation. The study shows that the main reason why the mechanism got stuck is the additional moment caused by the origin design and the assembling gap. An improved design scheme was proposed and analyzed by the rigid-flexible coupling method. The following results were concluded. The new scheme can solve the unreasonable stress problem on the transmission parts. The key components' deformation was also reduced to less than 0.05mm, which solves the clamping stagnation problem.