基于音圈电机的环形桁架结构主动悬吊方法

环形桁架结构是卫星可展开天线的基本结构。文章提出一种主动悬吊方法,可在地面状态下卸载环形桁架结构的重力。该方法基于音圈电机可以同时输出安培力和大位移,通过求解悬吊系统的静态方程计算悬吊点的张力即所需安培力;然后,建立主动悬吊试验系统,令音圈电机输出等于所需安培力,即实现悬吊结构对重力的卸载。经试验验证,悬吊后的结构前两阶频率与原结构的几乎相等,且模态一致,说明该悬吊方法有效。

Method for active suspension of hoop truss structure based on voice coil motor

The hoop truss structure is the basic structure of a satellite deployable antenna. In this paper, an active suspension method is proposed to unload the gravity of a hoop truss structure in the ground. In view of the fact that the voice coil motor can output an Ampere force with a large displacement, the tension at the suspension point is calculated by solving the static equation of the suspension system. Then, an active suspension test system is established. When the Ampere force output by the voice coil motor is equal to the tension, the structure is slung and the gravity is unloaded. Finally, the experimental results show that the first two orders of the frequencies of the structure with and without suspension are almost equal, and the modes are consistent. Therefore, the suspension method proves to be effective.