Research And Design For Hydraulic Steering Gear Of Ship

Chinese foreign trade volume increasing year by year by reform and opening up, in particular after accession to WTO foreign trade has entered a stage of rapid development. The shipbuilding industry has also entered in golden age along with fast development of shipping industry, but Chinese ship auxiliary equipment manufacturing capacity is lagging far behind the main vessel. It has become a bottleneck in the rapid development of shipbuilding industry. Steering gear is one of the most important equipment for controlling ships. Its good or bad performance plays a key role for ship motion control. But up to now domestic researchers for the steering gear studies are focused on how to control the ship heading and rudder track. There is a lack of researching hydraulic and electrical control about the steering gear. Therefore, research and development high-performance steering gear and achieve the mass production finally. It has great significance for strengthening competitiveness of Chinese shipbuilding industry.Principle and current condition of marine steering gear were analyzed in this paper. First, introduced structure of marine steering gears which were used commonly, choosed ball rotary-oscillating actuator as the new steering gear. According to requirements and actual needs, designed the schematic of fluid drive and the electrical control program after analyzed and compared the system seriously. The hydraulic system of steering gear was simplified. Corresponding mathematical models of proportional valve, valve control cylinder, angle sensor areas and other sectors were established. Mathematical model of the control system was ultimately made out and analyzed stability of steering gear system. As time domain response is slow of the servo loop and the ship affected by the wind, waves and other uncertain factors during voyaging. So used the fuzzy PID control and designed a fuzzy PID controller for this system. Dynamic model was established by using the Simulink toolbox in MATLAB software. Finally, used MATLAB software to carry through dynamic simulation and analyzed dynamic characteristics. Because steering signal is remote transmission in the ship. So adopted the operating room and steering gear room were decentralized control. The rooms were connected via CAN-bus. The control and feedback signals transmission speed and quality effectively were improved by CAN-bus. The main circuit, CANopen master control diagram and CANopen slave control principle were designed. In this paper steering gear was designed. Using electro-hydraulic proportional control, it can improve the positioning accuracy when the ship voyaging, and reduce impact and noise. Applying fuzzy PID control strategy, it can improve the dynamic performance of steering gear and enhance adaptive capacity of steering gear. Using field bus, it can increase data transmission speed and reliability. This paper has guiding significance for the design of small and medium steering gear.