微重力环境下部分充液贮箱内液体晃动特性分析

Analysis of Liquid Sloshing Characteristics in Partially Filled Liquid Storage Tank in Spacecrafts Under Micro-gravity

针对微重力环境下充液航天器液体燃料晃动的动态特性为研究对象,采用液体晃动等效力学模型对充液航天器贮箱内的晃动液体进行等效,推导出微重力环境下贮箱内液体的边界条件,得出贮箱所受力和力矩的计算公式,并计算出了力和力矩的大小.应用有限元数值仿真法计算出贮箱内液体晃动的力和力矩,通过与解析法得到的结果进行比对,验证了数值模拟算法的可靠性.

In this paper,the dynamics characterizes of sloshing liquid in spacecrafts under micro-gravity environment were studied.Firstly,the equivalent spring-mass model was employed to replace the sloshing fluid.The boundary conditions of the liquid in the tank under micro-gravity were derived,and the formulas were obtained to calculate the force and torque.Then,the FEM method was used to get the value of force and torque.The values were compared with the value obtained through analytic method to verify the reliability of the FEM method.Theory basics for analyzing liquid-sloshing in complex-shaped tank are provided.