某型机主起落架可折机构挠度计算系统研究与应用

Research and Application on Deflection Computation System of One Aircraft Main Undercarriage Foldable Mechanism

某大型运输机大修后主起落架形位尺寸发生变化,针对缺少可折撑杆挠度调整量计算方法的问题,基于主起落架机构运动学原理,建立了一套映射主起落架真实装机环境的数字样机系统,对主起落架三维模型采用运动仿真的分析方法,研究了主要零部件关键尺寸对可折撑杆向上挠度的影响规律,仿真分析了主起落架在不同零部件尺寸装配下机构的几何特性。该系统能根据装配后测量尺寸计算可折撑杆的向上挠度,并反求满足装配要求的支臂调长度节量。该计算系统有效地解决了该大型运输机主起落架大修时装配前不便计算、装配中反复调试的问题,提高了装配效率。

In order to calculate the deflection of the foldable bar resulting from the parts change of one large transport aircraft undercarriage,a digital prototype that can reflect the real installation environment of such a main undercarriage is created.A three-dimension model of the main undercarriage is analyzed by using the kinematic method to study the relationship between the dimensional variables and the assemble deflection of the foldable bar.The system can calculate the assemble deflection of the foldable bar with the inputs of geometrical parameters measured,and can give the adjustment value of the foldable bar which meets the assembly requirement inversely.This system solves the problem of assembly deflection calculation for the foldable bar during the overhaul,which improves the maintenance quality and efficiency considerably.