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Jitter Control for Optical Payload on Satellites

机译:卫星光学有效载荷的抖动控制

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摘要

The jitter control technique by using dual-stage vibration isolation system for optical payload on satellites is discussed, and it is applied on a satellite to improve the imaging performance. The dual-stage vibration isolation system includes two vibration isolation platforms. The first vibration isolation platform is at the actuator disturbance source, like control moment gyroscopes (CMGs). The second one is installed between the top of the satellite bus and the optical payload. In this paper, the first step constructs a general satellite dynamic model including a dual-stage vibration isolation system, a cluster of CMGs and solar arrays by Newton-Euler method and Kane equations, while the validity of this dynamic model is verified by a computer software program. The transmissibility matrices from CMGs motion to satellite motion and that to optical payload motion are then obtained according to the simplified satellite dynamic model. The parameters constraint conditions of the vibration isolation platform for the CMGs are described, with its influence on the attitude control system analyzed. The third part selects the reasonable parameters of the dual-stage vibration isolation system and those of the flexible solar arrays. Then the frequency domain characteristics of the dual-stage vibration isolation system are presented. Finally, using these reasonable parameters, the performance of this vibration isolation system on the satellite is testified by numerical simulations.
机译:讨论了利用双级隔振系统对卫星光学有效载荷进行抖动控制的技术,并将其应用于卫星以提高成像性能。双级隔振系统包括两个隔振平台。第一个振动隔离平台位于执行器干扰源,例如控制力矩陀螺仪(CMG)。第二个安装在卫星总线的顶部和光学负载之间。在本文中,第一步通过牛顿-欧拉方法和凯恩方程构建了一个通用的卫星动力学模型,该模型包括一个双级隔振系统,一组CMG和太阳电池阵列,并通过计算机验证了该模型的有效性。软件项目。然后,根据简化的卫星动力学模型,获得了从CMG运动到卫星运动以及到光学有效载荷运动的透射率矩阵。描述了CMG隔振平台的参数约束条件,并分析了其对姿态控制系统的影响。第三部分选择了双级隔振系统和柔性太阳能电池阵列的合理参数。然后给出了双级隔振系统的频域特性。最后,使用这些合理的参数,通过数值模拟证明了该隔振系统在卫星上的性能。

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