挠性卫星动力学建模与控制系统研究

【作者】 仝西岳；

【导师】 李东旭；

【作者基本信息】 国防科学技术大学 ， 航空宇航科学与技术， 2001， 硕士

【摘要】 挠性卫星的动力学建模和控制系统设计是航天领域研究的一个重要课题。本文针对单翼大挠性太阳帆板卫星，建立了挠性卫星动力学模型，在此基础上，研究了地球捕获、刚体卫星三轴姿态稳定、充液卫星三轴姿态稳定问题。另外，本文还建立了挠性卫星的控制模型。主要内容有五个方面： 1、运用牛顿定律、角动量定律和变分原理建立了带挠性附件的卫星动力学模型，分析了挠性太阳帆板转动对卫星动力学模型的影响。 2、以经典控制理论作为主要工具，研究了卫星捕获地球的技术，并对卫星捕获地球的整个过程进行了数值仿真。 3、设计了刚体卫星的三轴姿态稳定控制律，分析了外界干扰对刚体卫星姿态的影响和系统的稳定性。 4、在挠性卫星动力学模型的基础上，建立了只考虑太阳帆板三阶振动模态的挠性卫星三轴姿态控制模型。 5、针对带有椭球腔全充液的卫星，建立了液体做均匀涡旋运动的充液卫星动力学模型，分析了外界干扰和液体阻尼对卫星姿态稳定的影响。 通过对挠性卫星动力学模型和控制模型的研究，解决了挠性卫星姿态控制中的关键问题，对于研究挠性卫星的控制技术有一定的指导作用。文中设计的姿态捕获系统和刚体卫星姿态稳定系统，具有良好的动态特性，能够抵制外界的干扰，控制器简单且易于实现，具有较好的工程应用价值。更多还原

【Abstract】 Dynamic modeling and control system designing of a flexible satellite is a very important subject in the aerospace engineering. The dynamic model of the satellite with a flexible appendage has been studied in this thesis. Also,the techniques of the satellite earth acquisition and three-axis attitude stabilization of both the rigid satellite and the liquid-filled satellite have been researched. Besides,the control system design of the flexible satellite has been discussed. The main researches enclosed in this thesis are as follows:1. Based on the Newton’s law of motion,the law of angular momentum and the variation principle,the dynamic model of the satellite with a flexible appendage has been researched. Using this dynamic model,the influences of the flexible solar-array’s rotation have been discussed.2. Employing classical control techniques,the satellite earth acquisition has been studied and numerically simulated.3. The three-axis attitude stabilization of the rigid satellite has been studied. And,the influences of the external disturbances on the system stabilization have been studied.4. The three-axis attitude stabilization system of the flexible satellite has been studied,in which three basic vibration modes of the solar array have been considered.5. The dynamic system of the liquid-solid coupled satellite that is filled with an ideal liquid has been researched. The external disturbances and the liquid viscosity have been concerned in this study.The researches presented in this thesis are very useful to the flexible satellite attitude control. The control systems designed for the earth acquisition and for the attitude stabilization in this thesis have shown us their good dynamic properties.更多还原