基于参数化外形的通用大气飞行器建模与分析

提出了一类翼身组合升力体外形通用大气飞行器(Common Aero Vehicle, CAV)的参数化外形建模方法，采用气动工程预估方法计算CAV的气动系数，拟合得到能用于再入飞行器制导与控制仿真的气动模型，并通过分析，得到该模型静稳定性、气动效率及气动控制特性等方面的结论。结合飞行器再入飞行的运动方程，选取平衡工作点，基于小扰动线性化模型得到系统特征根分布来分析其稳定性，发现固定姿态的滑翔飞行时系统有正半平面极点，需主动控制调节；为了分析机动性，提出了以星下点轨迹曲率求取CAV转弯半径的方法，可快速获取机动性评估与参考指标，结果表明，该模型具有较好的转弯机动能力。

Modeling and Analyzing of Common Aero Vehicle with Parametric Configuration

A Common Aero Vehicle (CAV) model based on wing\|body combined with lifting body configuration is proposed in this paper. A parametric modeling technique is employed to describe the vehicles’ configuration. The aerodynamic coefficients are calculated by using an engineering method. The aerodynamic model is obtained through data fitting and can be used for guidance and control design and simulation. The static stability, aerodynamic efficiency and control performance are investigated. Small disturbance linearization and analysis of entry dynamics equations is conducted at the selected equilibrium point. The dynamics system has unstable positive eigenvalues, which means the active attitude control is needed to maintain vehicle stability. A ground track based minimum turning radius formula is presented to evaluate the maneuverability of vehicle. The result shows that this CAV model has good maneuverability.