空天飞行器六自由度数学建模研究

Six-DOF Modeling and Simulation of a Conceptual Unmanned Aeospace Vehicle

研究了空天飞行器超声速和高超声速飞行条件下六自由度仿真模型,该模型包含了完整的六自由度动力学方程和运动方程。气动力和力矩系数是迎角、马赫数及控制舵面偏角的函数;发动机模型为吸气发动机和变推力火箭发动机的组合推进装置;飞行器的质心;惯性矩是飞行器质量的时变函数。所得结果可以用于未来高超声速飞行器或新一代单级入轨运载器轨迹优化、姿态控制等问题的概念设计和仿真研究。

A Six Degrees of Freedom model and simulation of an aerospace vehicle is presented, which includes the whole of kinetic equations and motion equations. Aerodynamic force and moment coefficients are given as functions of angle of attack, Mach number and control surface deflections. The propulsion system covers a combination of an air-breathing engine and a variable thrust liquid propellant rocket engine. Rigid-body mass moments of inertia and center of gravity location are functions of time-varying vehicle weight. The model can be used to investigate trajectory optimization, attitude control conceptual design and simulation for new generation hypersonic vehicle or single-stage-to-orbit vehicle.