运载火箭三级无动力飞行段晃动稳定性研究

对某运载火箭三级无动力飞行段偏航通道晃动的不稳定现象进行了研究。在贮箱内推进剂沉底的条件下，采用等效弹簧．质量晃动模型，通过晃动方程的推导，证明了液体晃动只与火箭飞行中的惯性力有关，而与重力无关。由此认为偏航通道晃动不稳定是虚假的，适当修改偏航通道晃动方程形式，就可以解决偏航通道晃动不稳定问题。

Research on the Propellant-Sloshing Stability of Launch Vehicle in Its Third Stage Flight without Power

The propellant sloshing un-stability of yaw channel in its third stage flight without power for some launch vehicle was researched in this paper. The equal mass-spring model was adopted on the condition that the propellant was pressed on the bottom of the tank. It was proved that the propellant sloshing was related to the inertia force only but not to the gravity by deducing the propellant sloshing equations. Through the deduction of the sloshing equation, the phenomenon of the sloshing un-stability of the yaw channel was believed to be not real, the problem for the sloshing stability of the yaw channel could be solved by the modification of the sloshing equation.