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.%The key technology aimed at developing integrated flight dynamic model for aerospace vehicle is investigated in this paper. First, an approach that choosing the WGS-84 world reference frame generally used in reentry vehicle's navigation as reference, and deriving vehicle's equations of mass-center motion as well as describing flight attitude in the north-up-east reference frame is proposed, and then a set of general equation of motion for ideal rigid aerospace vehicle which can satisfy the need of reentry and accurate landing is developed. Second, based on the successful application of elastic dynamic model of launch vehicles and missiles etc, the mixed reference frame method is applied in this paper to develop rigid-elastic coupling dynamic model for aerospace vehicle. The applied method is that using quasi-coordinates to describe the equivalent rigid translational motion and rotational motion, and using finite element theory to describe the complicated elastic vibration of the elastic vehicle relative to the equivalent rigid vehicle, and using the additive force and moment induced by additive angle of attach and sideslip to describe the coupling between the he equivalent rigid vehicle and the elastic vehicle. Based on the general equation of motion for ideal rigid aerospace vehicle, the rigid-elastic coupling equation of motion for plane symmetric aerospace vehicle is created. Because of the effect of earth's ellipse and rotation motion are sufficiently considered, and the rigid-elastic coupling characteristic is also sufficiently considered, the dynamic model developed in this paper is appropriate for engineering application.
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