RLV投放轨迹飞行动力学特性分析

An Analysis on the Characteristics of a RLV's Un-Powered Dropping Trajectories

根据投放任务要求设计缩比可重复使用空间飞行器(RLV)投放轨迹,并建立飞行动力学基本分析框架。其中包括对轨迹进行参数灵敏度分析和沿轨迹的操稳特性分析。灵敏度分析则包括飞行终端状态参数受模型变化、投放条件、操纵参数、风场等内外扰动影响的分析。稳定性分析包括静稳定性和失速/偏离判据以及模态特性分析;操纵性分析包括考虑平衡、增稳和机动性余量三方面的要求。以上工作为导航和控制设计奠定了重要基础。

In this paper, flight trajectories were designed for a small-scale model of a reusable launch vehicle (RLV) according to the dropping missions.A priemary analysis system of the flight dynamics was then built, which included analysing steps on the sensitivity of the trajectory and control and stability along the trajectory. In the sensitivity analysis of the trajectory were considered the sensitivities to variations of aerodynamic models, release parameters, control commands and to gusts.In the stability analysis were used typical longitudinal and lateral-direction stability index, while in the control analysis were estimated the control power requirements for trim, stabilization and maneuverability. All the procedure lays a foundation for the next-phase work of navigation and control law design.