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充液卫星地面物理仿真中,受重力影响,无法在气浮台上直接放入液体贮箱进行仿真。为实现充液卫星整星模型的地面物理仿真,该文提出利用飞轮施加卫星充液贮箱内液体的晃动力矩的方案。该试验方案基于液体晃动的等效单摆模型,得到了实时获取卫星液体晃动力矩数值,并通过飞轮实时施加等效晃动力矩,来等效液体晃动,进行整星运动仿真。仿真结果及理论分析表明:考虑采样时间、延时效应、外力矩的影响,该地面物理仿真方案能够很好地模拟在轨卫星的运动规律;对飞轮求解方程进行等效处理可以简化飞轮角速度指令计算及相应陀螺力分析。
Liquid-filled satellite ground-based physical simulation, under the influence of gravity, can not directly into the liquid tank on the flotation platform for simulation. In order to realize the ground physics simulation of the star-filled satellite model, this paper proposes a scheme of using the flywheel to apply the sway torque of the liquid in the liquid-filled tank of satellite. The experimental scheme is based on the equivalent pendulum model of liquid sloshing. The real-time gain of satellite liquid sloshing torque is obtained. Equivalent sloshing torque is equivalently applied by flywheel in real time to simulate the whole-star motion. The simulation results and theoretical analysis show that considering the influence of sampling time, delay effect and external moment, the ground physical simulation program can well simulate the orbiting satellite’s motion law. Equating the flywheel solving equation can simplify the flywheel angular velocity command Calculation and Corresponding Gyro Force Analysis.