通过对重复使用运载器再入动力学建模技术的研究,提出以再入飞行器导航常用的WGS-84世界大地坐标系为参考,在北天东坐标系建立飞行器再入质心动力学方程和描述飞行姿态的建模方法,建立可兼顾再入返回和高精度着陆需求的通用刚体动力学模型;借鉴运载火箭与导弹等弹性飞行器动力学模型的应用经验,提出混合坐标法,首先用准坐标系描述飞行器等效刚体的刚性平动和转动,然后用有限元理论描述弹性飞行器相对于等效刚体的复杂弹性振动,最后利用弹性变形引起的附加攻角和侧滑角产生的附加力和力矩体现刚体和弹性振动耦合的刚弹耦合动力学模型建模方法,并基于再入通用刚体动力学模型建立适用于面对称重复使用运载器的再入刚弹耦合动力学模型。结果表明:建立的重复使用运载器再入动力学模型充分考虑了地球椭球体和自转的影响,模型物理意义明确,工程实用性强。 Through the research on re-entry kinetic modeling technology of reusable vehicles, the WGS-84 world geodetic coordinate system commonly used in reentry vehicle navigation is proposed as a reference, and the reentry vehicle centroid equation and description Flight attitude modeling method to establish a universal rigid body dynamics model which can take into account the reentry return and high-precision landing requirements. Based on the experience of application of the dynamic model of the elastic vehicle such as launch vehicle and missile, a hybrid coordinate method is proposed. Firstly, Describe the rigid translation and rotation of the equivalent rigid body of the aircraft and then describe the complex elastic vibration of the elastic aircraft relative to the equivalent rigid body by means of the finite element theory. Finally, the additional forces and moments generated by the additional angles of attack and the side slip angle caused by the elastic deformation are reflected Rigid-body and elastic vibration coupled rigid-elastic coupling dynamics model modeling method, and based on the re-entry universal rigid-body dynamics model established for the symmetric reusable carrier re-entry rigid-elastic coupling dynamic model. The results show that the established re-entry kinematic model of reusable vehicle fully takes into account the influence of the ellipsoid and rotation of the Earth. The physical meaning of the model is clear and the engineering practicability is strong.