| In this paper, the wind load of antenna is analysised and the model of servo system by double-motor is established against the background of the development of certain precision radar turntable server. Furthermore, different types of variable structure controller is designed for improving the tracking precision or robustness respectively.First, the whole design scheme of the server is introduced.Second, wind load of circular parabolic antenna is studied. We use the relationship between two-dimensional body axis coordinate system and three-dimensional body axis coordinate system, and use the rule of forces moving to derive the formula computering wind load torque of radar turntable axis.Third, according to the dynamic characteristics of double-motor, the control block diagram of the practical servo system is established.Finally, theory of variable structure control is studied. For improving the tracking precision of practical servo system, a variable structure controller based on proportional switching function is designed. For wind load torque and friction exists in servo system, a robust variable structure controller is designed to improve the system performance of interference suppression. |
PDF Full Text Request