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为抑制各种内外干扰因素对挠性卫星姿态控制性能的影响,设计基于干扰观测器的滑模变结构控制器.该控制器采用干扰观测器对系统中存在的内外干扰进行估计,并对估计值加以前馈补偿.在此基础上,采用滑模变结构控制器对未补偿的干扰进一步抑制,实现卫星姿态与姿态角速度的渐近收敛.与单纯的滑模变结构控制器相比,本文的控制器已根据干扰估计值对干扰进行了前馈补偿,采用较小的切换增益即可抑制剩余干扰,颤振现象减弱.仿真结果表明,本文设计的控制器是可行的.
In order to restrain the influence of various internal and external disturbances on the attitude control performance of flexible satellite, a sliding mode variable structure controller based on disturbance observer is designed. The disturbance observer is used to estimate the internal and external disturbance existing in the system, Based on which the sliding mode variable structure controller is used to restrain uncorrected interference and achieve the asymptotic convergence of satellite attitude and attitude angular velocity.Compared with the simple sliding mode variable structure controller, Of the controller has been feedforward based on the interference estimate of the feedforward compensation, the use of a smaller switching gain to suppress the remaining interference, chattering diminished.The simulation results show that the design of the controller is feasible.