Position Control for the Cabin Support and Feed System of Large Spherical Telescopes

J. Huang, B.-Y. Duan, B. Zi, and Z.-L. Dong (PRC)


Robust control, dynamic modeling, sliding mode control, Square kilometer array, cabin support and feed system


In order to overcome the strong nonlinearity and big lag of the cabin support and feed system of large spherical telescope and improve its robustness against wind disturbance, sliding mode control with parameter adaptation (ASMC) is proposed. Based on Lyapunov stability theory, a MIMO sliding mode control law is derived with the linear model of the plant, and the modeling error and wind force are considered as external disturbances that are estimated and compensated on line. A series simulation is finished with the parameters of a 50 meter scaled model of Five hundred meter Aperture Spherical Telescope (FAST). The results show that the tracking error is reduced significantly and the robustness of system is improved with the ASMC than that with traditional PID control.

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