多体卫星地面物理仿真的一致性研究

三轴气浮台不能直接用于多体卫星的地面物理仿真实验,这是由于部件转动引起台体的质心变化,进而产生重力静不平衡力矩,使仿真过程无法进行,因此需要质心补偿系统对气浮台的重力静不平衡力矩进行补偿。本文通过对多体卫星动力学和气浮台动力学的比较,分析了在重力场中的地面物理仿真系统与真实卫星的动力学特性的不同点,给出地面物理仿真系统能完全模拟真实卫星运动的一致性条件,并进行了数学仿真。当转动附件的质心在转动轴或转动中心上时,气浮台系统可以完全模拟卫星系统的质量特性和力学耦合特性,否则,多体气浮台系统和多体卫星系统的动力学耦合特性不完全一致,需要采取一定的方法进行补偿。

Investigation on Consistency between Multi-body Satellite and Ground Physical Simulation System

Three-axis air-bearing table can not be used in ground physical simulation of multi-body satellite, because when the rotatable appendages move, the alteration of table's centre of mass causes gravity unbalance moment which makes the simulation failure. To solve the problem, the compensation system of centre of mass was developed. This paper researched on the dynamics of multi-body satellite and air-bearing table, analyzed the differences of movement performance between real satellite and ground physical simulation system (GPSS), and developed the consistency condition that the GPSS can simulate the real satellite. When the appendage's centre of mass is superposed with the axis (or centre) of rotation, GPSS can simulate the property and movement performance of real satellite, otherwise, the GPSS will be not consistent with the real multi-body satellite, and more compensation may be applied.