水平着陆飞行器着陆架系统耦合压缩触地过程仿真分析

Horizontal Landing Vehicle Undercarriage Coupling Compressing Touchdown Process Simulation

水平着陆飞行器着陆架触地是一个短时间、高动态的复杂运动过程,着陆架系统中的轮胎和减震器压缩过程存在耦合因素,直接求解其微分方程具有一定的困难。采用一种基于力矩瞬时平衡条件的触地过程仿真分析方法,通过求解以减震器压缩量增量为自变量的一元非线性方程,得到既满足力矩瞬时平衡条件又满足几何耦合关系的减震器压缩量和轮胎压缩量。该方法不需要求解着陆架系统的运动方程,可在飞行器六自由度仿真模型基础上直接扩展,无需改变其仿真步长,可有效应用于水平着陆飞行器着陆架系统耦合压缩触地过程的仿真分析。

The undercarriage touchdown of horizontal landing vehicle is an instantaneous and high dynamic process.The compressing process of the tire and the shock absorber is coupling.It is difficult to solve the differential equation directly.A simulation method for touchdown process based in instantaneously balanced condition is adopted.By solving an equation which takes the changing amount of the shock absorber's compressing as the independent variable,the compressing amount of the shock absorber and the tire can be obtained,which can satisfy both the instantaneously balanced condition and the coupling geometry relationship.This method need not solve the differential equation of the undercarriage,and can be developed on the base of the vehicle's 6 DOF motion equation,and need not change its simulation step.This method can be used for touchdown process simulation of horizontal landing vehicle effectively.