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为实现星上光学有效载荷的高成像性能,对星上光学有效载荷的两级隔振进行了研究。所谓两级隔振,即除了对控制力矩陀螺群(CMGs)等执行机构振动源进行隔振外,还在光学有效载荷和星体之间加入隔振装置。首先建立了含有两级隔振系统以及CMGs和太阳帆板的整星动力学模型,并采用ADAMS工程软件验证了所推导模型的正确性;其次,在合理假设的基础上简化模型,分别求得由扰动源到星体和有效载荷的传递函数矩阵,分析CMGs隔振平台参数变化对姿态控制系统的影响,选择合理参数分析两级隔振系统的频域特性;最后通过数值仿真分析了两级隔振系统在星上应用的可行性,并通过频谱对比分析两级隔振系统对光学有效载荷姿态稳定度的改善程度。
To achieve the high imaging performance of on-board optical payloads, two-stage vibration isolation of on-board optical payloads was studied. The so-called two-stage vibration isolation, that is, in addition to the control torque gyros (CMGs) and other implementing agencies vibration source vibration isolation, but also between the optical payload and the astral added isolation device. Firstly, the whole-star dynamic model with two-stage vibration isolation system, CMGs and solar panels is established and the correctness of the model is verified by ADAMS engineering software. Secondly, the model is simplified based on reasonable assumption, From the perturbation source to the transfer function matrix of the astral body and the payload, the influence of the parameters of the CMGs platform on the attitude control system is analyzed. The frequency domain characteristics of the two-stage vibration isolation system are analyzed by choosing reasonable parameters. Finally, by numerical simulation, Vibration system in the satellite application feasibility, and through spectrum analysis of two-stage vibration isolation system to improve the optical payload attitude stability.