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空间太阳能电站是一种具有超大和高柔性特征的空间结构,这种空间结构在尺寸上远超以往的航天器,给轨道动力学特性的研究带来了新现象与新问题。以千米量级的哑铃模型为研究对象,考虑重力梯度影响,建立了Hamilton体系下的在轨动力学模型,利用辛龙格库塔法得到了不同参数取值下的动力学响应。通过对比仿真结果,得到了结构尺寸与重力梯度对轨道运动、姿态运动影响的定量关系。仿真结果表明,重力梯度引起了姿态-柔性振动耦合现象,姿态运动影响了结构振动曲线外部包络线样式,而柔性振动改变了姿态运动周期。
The space solar power station is a kind of space structure with large and highly flexible characteristics. The space structure far exceeds the spacecraft in the past, bringing new phenomena and new problems to the research of the orbit dynamics. Taking the dumbbell model of kilometer scale as the research object, the in-orbit dynamics model of Hamilton system is established considering the influence of gravity gradient. The dynamic response under different parameters is obtained by using the symplectic Runge-Kutta method. By comparing the simulation results, the quantitative relationship between the size of the structure and the gravity gradient on orbital motion and attitude motion is obtained. The simulation results show that the gravity gradient causes the coupled phenomenon of attitude-flexible vibration, and the attitude movement affects the outer envelope of the structure vibration curve, while the flexible vibration changes the period of the attitude movement.