充液卫星地面物理仿真方法

Ground simulations of liquid-filled satellites

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。

Because of earth gravity, liquid fuel tanks cannot be fixed on air-bearing tables to simulate satellite movements in space. This paper describes the use of fly wheels to simulate the sloshing liquid torques for ground simulations. A liquid sloshing model is used to compute the sloshing torques with fly wheels then designed to output the same torques in real time for satellite sloshing liquid simulations. Simulations show that the influences of sampling time, delay, and external moments are well simulated and that an equivalent treatment of the fly wheel dynamics equations can simplify the computations of the fly wheels＇ angular velocity and the gyro force analysis.