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采用单框架控制力矩陀螺(SGCMG)作为主要执行机构,研究了挠性卫星的敏捷机动问题.首先,为挠性卫星建立带有时变参数及模型不确定性的刚柔耦合动力学模型;配置控制力矩陀螺/飞轮混合执行机构以满足敏捷卫星快速机动和高精度的任务需求.然后,设计积分型变结构控制律,并利用神经网络补偿器逼近不确定项,消除卫星挠性耦合特性和模型不确定性对系统的影响.最后,对算法进行了仿真验证.结果表明所设计的控制系统能够在执行机构不产生奇异的前提下,有效地抑制挠性附件的振动,使卫星在外界干扰及模型不确定性的影响下,快速达到要求的指向精度和稳定度.
The single-frame control moment gyroscope (SGCMG) is used as the main actuator to study agile maneuvering problems of flexible satellites.Firstly, a rigid-flexible coupled dynamic model with time-varying parameters and model uncertainties is established for flexible satellites. Configuration control Torque gyro / flywheel hybrid actuator to meet the agile satellite rapid maneuver and high-precision mission requirements.And then, an integral variable structure control law is designed and the neural network compensator is used to approximate the uncertainties to eliminate the satellite’s flexible coupling characteristics and model And the certainty of the system.Finally, the simulation results show that the proposed control system can effectively suppress the vibration of the flexible attachment without the singularity of the actuator, Under the influence of uncertainty, the required pointing accuracy and stability are quickly achieved.