Research On High-precision Control System Of Shipborne Rocket Launcher Based On Permanent Magnet Synchronous Motor

With the development of national defense technology,modern warfare has higher requirements for rocket launching accuracy.The control performance of the rocket launcher AC servo system affects the launch accuracy of the rocket launcher.In this paper,a ship-borne rocket control system is taken as the research object,and the position-current double-loop control strategy is designed to improve the control precision of the rocket control system.Firstly,the components and working principle of the shipboard rocket launcher servo system are analyzed.Secondly,based on the analysis of the mathematical model of PMSM,the mathematical model of the rocket launcher system is established and the stability of the system is verified.Finally,the nonlinear factors affecting the system are analyzed.Aiming at the problem that the PMSM electrical parameter perturbation affects the control effect of the controller,this paper uses the improved particle swarm to identify the PMSM electrical parameters online,and improve the control precision of the system.Aiming at the problem that the current loop has the influence of nonlinear factors such as current coupling and system parameter perturbation,the global fast terminal sliding mode control(GFTSMC)is introduced into the current loop to suppress the influence of nonlinear factors on the system and improve the shaft current control.Accuracy,which in turn improves the control accuracy of the system.At the same time,the introduction of adaptive law compensates the uncertain factors of the system and improves the robustness of the system.In order to further improve the control performance of the shipboard rocket launcher servo system,a non-singular terminal sliding mode control(NTSMC)for position and speed composite control is designed.The equivalent control term for sliding mode has uncertain parameters,and it is approximated by RBF neural network adaptive.The RBF neural network is used to dynamically adjust the switching gain of sliding mode control to weaken the chattering of sliding mode.At the same time,an extended state observer(ESO)is introduced to observe and compensate for external disturbances.Simulations show that the control strategy improves the control accuracy of the system.An experimental platform was built to verify the control strategy of this paper.The experimental results show that the designed control strategy can not only meet the performance indexes of the system,but also effectively realize the high-precision control of the system.