气浮台质心漂移干扰力矩及最优参数研究

三轴气浮台质心漂移引起的干扰力矩是衡量气浮台工作能力的重要指标。针对航天八院研制中的5 000 kg三轴气浮转台干扰力矩评估与最优设计问题，建立理论分析模型，论述气浮台的质心漂移取决于三个基本变形参数。然后采用数值仿真和理论分析的方法，深入讨论气浮球心最优偏移与气浮台重力干扰力矩之间的关系，基于分析结论建议初始姿态调平后气浮球心相对于气浮台质心适当偏移可以有效抑制干扰力矩。结论还认为微摆0.3°产生的干扰力矩接近零对气浮台结构设计来说并不是困难，追求摆动0~15°范围内重力干扰力矩最小才是气浮台设计所面临的最大挑战。另外，还总结了最优参数的变化趋势，为气浮台的设计、调平提供了有益的建议。

Research on the Optimum Parameters and Unbanlanced Torque Based on the Offset of Mass-center of the Air Bearing Testbed

Triaxial air bearing testbed, a core sophisticated equipment for physical simulation of spacecraft, are used widely. The unbanlanced torque caused by elastic deformation and self weight of the testbed is an key index of work ability. To evaluate the unbanlanced torque and optimize the design of the proceeding “5 000 kg triaxial air bearing testbed”, a theoretical model is presented, by which 3 basic deformation parameters are defined to describe the offset of the mass center. With the help of numerical simulation and theoretical analysis, 2 optimization questions are raised and the optimum upward shifts of the mass center are specially advised to reduce the unbanlanced torque. It’s not difficult for testbed design to make the unbanlanced torque during the small swing, e.g. 0.3°, approach zero, while the most challenging task is to minimize the unbanlanced torque during the 15° bias from the initial attitude. Moreover, the tendency of optimum parameters are concluded, which can be adopted as an useful advice for the design and levelling of the air bearing testbed.