航天器中性浮力变质心实验体六自由度动力学建模研究

摘要

The research on dynamic modeling for experimental object is the key technology of the spacecraft ground neutral buoyancy experiment.In order to achieve experimental body accurately trim and solve the problem that the viscous forces and the inertia forces are difficult to split,adopting the matrix operations form instead of vector cross product form,applying the method of ignoring some secondary viscous hydrodynamic terms which are not easy to split,eventually the experiment centroid variables and engine thrust as a control variable,the experimental body dynamics state equations are established.It provides important modeling basis for simulation of six degrees of freedom motion in spacecraft experiment environment of neutral buoyancy.%实验体的动力学建模研究是航天器地面中性浮力实验的关键技术.针对实现实验体精确配平,解决水动力建模中的粘性力和惯性力不便分割等问题,采用矩阵运算形式代替矢量叉乘形式,通过应用忽略一些不易分割的次要粘性水动力项的方法,最终将实验体的质心变量和发动机推力作为控制量,建立了实验体动力学状态方程,为地面中性浮力实验环境中航天器六自由度运动控制与仿真提供了重要的理论基础.