大型飞行器六自由度仿真建模研究

以某型号大型飞行器为背景，提出了建立大型飞行器六自由度仿真模型的一般原则和方法，综合考虑了飞行器质心运动、绕质心运动、控制系统动态特性、发动机摆动惯性、推进剂晃动、弹性振动及它们之间的铰链耦合等因素对飞行器运动的影响，重新推导了质心运动和绕质心运动数学模型，建立了全量、全干扰、三通道、大姿态条件下时变非线性六自由度仿真模型，经计算机仿真及飞行试验证明该模型是正确的，比传统的三自由度模型更加完善、精确和有效。

The Modeling Research of Six Degree of Freedom Simulation of Large Scale Space Vehicle

With background of a certain type of large scale space vehicle, this paper puts forward the general method and principle of establishing simulation model of large scale space vehicle. Taking space vehicle centroid movement, attitude movement, control system dynamic characteristic, inertia of engine swing, propellant sloshing, elastic vibration and coupling influence on the space vehicle into account syntnetically, this paper derives centroid and attitude movement mathematical model afresh, establishes a non linear six degree of freedom simulation model under great attitude condition with complete quantity, total disturbance and three passage, which is more accurate and effective than traditional three degree of freedom simulation model through validation and verification of computer simulation and flight test.