Coupling dynamics of super large space structures in the presence of environmental disturbances
Coupling dynamics of super large space structures in the presence of environmental disturbances
复制标题
环境扰动下超大空间结构耦合动力学
DOI：
10.1016/j.actaastro.2018.05.022
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发表时间：
2018
影响因子：
3.5
通讯作者：
Qi Zhaohui
中科院分区：
文献类型：
--
作者：
Mu Ruinan;Tan Shujun;Wu Zhigang;Qi Zhaohui
考虑重力梯度、太阳辐射压和热辐射的影响，建立了在轨道平面内绕地球运动的超大柔性梁结构的耦合动力学模型。同时分析了环境扰动对轨道运动、姿态运动和结构振动的影响。研究了初始姿态角、结构尺寸等系统参数对耦合动力学的影响。结果表明，振动响应的包络形状与姿态运动有关，轨道运动的摄动随初始姿态角的增大而增大。当结构基频与姿态频率接近时，随着结构尺寸的增大，平均轨道高度略有降低。姿态运动的主频率分量减小，与结构振动相关的频率分量相遇并增长。共振导致系统不稳定。此外，姿态运动的幅度也会受到稍微强烈的结构振动的影响，该结构振动可能由姿态控制系统的动量交换装置激发。此外，在SRP的存在下，轨道半径受到明显的扰动，轨道运动的偏心率也普遍发生变化。在低轨道上，热辐射和重力梯度对结构振动的影响处于同一数量级，而在静止轨道上，热辐射的影响占主导地位。
Considering the effects of the gravity gradient, the solar radiation pressure (SRP) and the thermal radiation, the coupling dynamical model is established for a super large flexible beam structure, which moves in the orbital plane around the earth. The effects of environmental disturbances on the orbital motion, the attitude motion and the structural vibration are analyzed simultaneously. Influences of the initial attitude angle, the structure size and other system parameters have been investigated for the coupling dynamics. The results show that the envelop shapes of the vibration responses are dependent on the attitude motion, and the perturbation of orbital motion increases with the growth of the initial attitude angle. When the structural fundamental frequency is close to the attitude frequency with the increase of the structure size, the average orbit altitude would decrease slightly. The main frequency component of the attitude motion decreases and the frequency component related to the structural vibration encounters and grows up. The resonance then leads to system instability. Moreover, the magnitude of the attitude motion can also be influenced by the slightly intense structural vibration, which might be excited by the momentum exchange devices of the attitude control system. In addition, in the presence of the SRP, the orbital radius is perturbed obviously and the eccentricity of orbital motion is generally changed. The effects of the thermal radiation and the gravity gradient are in the same order of magnitude on the structural vibration in the low orbit while the former one turns to be dominant in geostationary orbit.