再入大气层航天飞机的动力学建模与仿真

探讨了返回式航天飞机在再入大气层飞行阶段的动力学建模与仿真技术，基于牛顿定律建立了描述再入大气层飞行过程的六自由度非线性动力学和运动学数学模型。其中地球被描述为绕短轴自转的椭球体，重力场梯度由四阶Ｊｅｆｆｅｒｙ常数描述，航天飞机的姿态运动用四元素法描述，以避免模型方程中的数值奇异点。同时，以某型机组返回器为对象，建立了空气动力学模型，在Ｓｉｍｕｌｉｎｋ环境下开发了飞行仿真器软件系统，检验了其性能和

Nonlinear Dynamic Modeling and Simulating of Re-Entry Crew Return Vehicle

A general simulator of atmospheric re entry dynamics is developed and implemented in the Simulink environment with the XX CRV as the background model. A nonlinear Newtonian re entry dynamic model of six degree of freedom is developed and implemented. The earth is modeled as an oblate and rotating spheroid, and higher order terms in the multiple expansion of gravitational fields are considered. To avoid singularities in computations, the quaternion representation of the spacecraft attitude is used in the angular kinetic model equations. One re entry vehicle is analyzed, modeled and implemented. Numerical simulation tests and analyses are conducted to verify the correctness and performance of the models and the simulator.