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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 ,检验了其性能和仿真精度 ,并通过数字仿真验证了该仿真器的正确性
The dynamic modeling and simulation technology of the space shuttle during the reentry atmospheric flight was discussed. Based on Newton’s law, a six-degree-of-freedom nonlinear dynamic and kinematic mathematical model describing the re-entry into the atmosphere was established. The earth is described as an ellipsoid that rotates about its minor axis. The gravitational field gradient is described by the fourth-order Jeffery constant. The attitude of the space shuttle is described by a four-element method to avoid numerical singularities in the model equations. At the same time, the aerodynamic model is established for the reflector of a certain type of generator. The flight simulator software system is developed under the environment of Simulink, the performance and simulation precision are verified, and the correctness of the simulator is verified by digital simulation