Space solar power station is a kind of space structure with large size and high flexibility.It is far larger than the previous spacecraft in size,which results in new phenomena and new problems on the study of dynamical characteristics.The kilometer-scale dumbbell model was studied.The Hamilton's dynamical model on orbit was established under the effect of gravity gradient.The symplectic Runge-Kutta method was used with different combinations of parametrical values to obtain dynamical responses.By comparing the simulation results,the quantitative relationships were determined respectively between the size of space structure and the effect of gravity gradient on orbital motion and attitude motion.It is found that:due to the gravity gradient,the coupling phenomenon between attitude motion and elastic vibration occurs;the attitude motion has great influence on the external envelope curve of elastic vibration response,while the period of it is changed by elastic vibration.%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.
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