The Simulation Research Of Power Matching Strategy For Ship Hydraulic Propulsion System

Hydraulic transmission technique has the advantages, such as high power quality ratio, great overload safety performance, stepless speed regulation ability, etc. So it is widely used in transportation engineering, including engineering vehicles, ship deck machinery. And some ship thruster devices are also driven by hydraulic motor. However, the application of hydraulic drive as the ship’s main propulsion device has not been promoted. With the developing of marine economy, traditional direct ship propulsion is hard to meet the ship propulsion performance requirements. In the context of this situation, For the advantage of Ship Hydraulic Propulsion in maneuverability, mobility and multiple load matching ability, it has bright application value and wide prospect.In this paper, the resistance of a trawler was calculated, and the preliminary design of ship propeller was carried out. A Hydraulic Propulsion scheme with two variable displacement pump and one variable displacement motor was proposed. After the system schematic design was finished, the main components were selected. And the Power Matching Strategy was presented and analyzed. To verify the Power Matching Strategy, A4VSG variable displacement pump, A6VM variable displacement motor, Pump-control-motor system mathematical models and ship propeller mathematical model were established. The hydraulic propulsion system simulation model was built in AMESim environment. The ship propeller simulation model and control system simulation model was built in Matlab/Simulink environment. At last, Matlab/Simulink and AMESim co-simulation analysis was conducted in two different conditions:direct setting sail and grading setting sail, as well as the simulation analysis of the power matching strategy in light load condition and heavy load condition.The simulation analysis results shows:the grading setting sail form is more suitable for hydraulic propulsion vessel; the power matching strategy can achieve the displacement self-turning of the variable displacement motor, and the pressure of hydraulic system is close to the rated pressure. Also the diesel engine and pump can operate near the rated conditions. Which can keep the system working in a high work efficiency.