The Research Of Rotary Vane Steering Gear Based On DDVC Technology

Marine steering gear is the most important control mechanism of ship course.The steering performance of ship servo system has a direct impact on flexibilityand security of ship. From at home and abroad for the steering gear developmentstatus,high noise and high power consumption, slow response are a huge obstacleto the development in the future.With the continuous development of science andtechnology, Low power consumption, small size, fast response, and low noise ofservo are the development trends of future. The topics will design a rotary vaneservo system based on DDVC technology, and use permanent magnet synchronousmotor (PMSM) to drive dosing pumps running directly which in turn drives therotation of the rudder blade. Compared with the traditional servo control mode,it eliminates the need for expensive variable pumps and solenoid valves. Thestudies of this paper intend to prove that the rotary vane servo system basedon DDVC are higher than the traditional steering gear system in aspect of noisecontrol, energy saving, compact integrated, dynamic characteristics, and otherindicators. It will also provide a theoretical basis applying DDVC to rotaryvane steering gear system.By looking up a number of literatures, this paper firstly use the permanentmagnet synchronous motor (PMSM) to analyze the permanent magnet synchronousmotor frequency control methods and principles, and establish the mathematicalmodel of the entire synchronous motor frequency control system as well as thepart of system dynamics and rotary vane pump control motor. Does an integrateddesign of direct-drive servo system, eliminates the need for some unnecessarycontrol valves and piping, and reduces the volume of the servo system andeconomic costs. This paper will analyze the reasons of noises in the servo systemand try to give solutions.With reference to control requirements of rotary vane system and thetechnical parameters of the relevant parts, we get the simulation parametersof the various components of the system through mathematical calculations. Andwe do a reasonable selection for the motor part, the hydraulic power part, andthe actuator part of the entire system. These lay the foundation for subsequentmodeling and simulation studies. And we use MATLAB software to study simulation in order to analyze the effect of the entire control system. Therefore, thereasonable opinion can be given to optimize the characteristics of the servosystem by changing several structural parameters. It will design a PIDcontroller for direct-drive servo system comparing the simulated images withor without Hydrodynamic torque interference so that the dynamic performance andcontrol precision based on the simulation curve are analyzed through simulationstudy.And last This paper will design a control strategy that focuses on thedefaults of small rudder angles of the direct-drive servo system, low speed DEADand ineffective frequency response. By means of a fuzzy adaptive PID controllerbased on fuzzy control theory to optimize control, we find that the dynamiccharacteristics of the system, the high-frequency response capability and thecontrol accuracy have been significantly improved. Meanwhile it can reduce thenegative effect on the system for time-varying characteristics of the dead zoneand hydrodynamic loads.