Simulation Research On The Hydraulic System Of Offshore Wind-Turbine Installation Vessel

In recent years, as one of the new energy sources project focused by lots of countries, wind-turbine is developed rapidly in the whole world.With the technique turning from the land to ocean, offshore wind-turbine has become the highlights of new energy development. Because of the difficulty of the offshore wind-turbine installation, flat-bottomed barges and floating crane vessels are the most regularly used equipment to transport and install.The equipments is expensive, the construction technics is complicated and the installation cost is high.As a pecial equipment developed due to the loading mode of 3MW offshore wind-turbine and marine working features, the installation vessel consists of mechanical system and hydraulic system. It belongs to a big complex nonlinear system.In the process of offshore wind-turbine installation, the swaying motion of the vessel caused by the waves has a great effect on docking between the wind-turbine and the abutment. With the hydraulic swaying motion control system equipped, the vessel can reduce the deflection effectively.Using conventional analytical methods or traditional mechanical analysis software can't get the actual dynamic parameter. So this paper uses 3MW offshore wind-turbine installation vessel as object to research on mechanical-hydraulic coupling system co-simulation.According to dynamic simulation results, this paper designs the hydraulic system which has an important value.Based on the co-simulation technology using ADAMS and Simscape,this paper builds the dynamic model of the whole machine and hydraulic system.According to the results of co-simulation analysis,the hydraulic swaying motion control system reduces the deflection by 76% in the process of the installation. And this paper also provides the bases used by defining parameters of the system.This paper analyses the wind-turbine's size, weight, the abutment form and other parameters to determine the vessel's technology parameters and installation process.After simplifies the mechanical system and establishing the motion function of the vessel this paper builds the dynamic model of the whole machine using ADAMS,based on Simscape, building electrohydraulic servo valve modules accomplishes the hydraulic swaying motion control system and also brings up its parameters setting and control methods.By signal interaction this paper researches the mechanical-hydraulic coupling system co-simulation of offshore wind-turbine installation vessel in the environment of Simulink. By obtainning the pressure and the flow rate of the system by the sensors analyses pressure changing's influence to the hydraulic system. The maximum flowrate of the simulation result determines the hydraulic pump. By the co-simulation this paper researches on the design and dynamic characteristic of the hydraulic system.By the simulation we can abtain the measurement of dynamic characteristic parameter and its results provide data bases used by subsequent structure finite element analysis and fatigue life assessment.By interpretation of result, this paper determines the impact pressure of the hydraulic system is 40MPa, the working pressure is 8MPa. The maximum flowrate is 800L/min. The pipeline's influence to the system is huge, so it's necessary to place the hydraulic power unit near the balancing fixture.Using valve flowrate control system can satisfies the requirement of the swaying motion control system.By mechanical-hydraulic coupling system co-simulating of offshore wind-turbine installation vessel,this paper made a significant attempt on the dynamic simulation research of the complex construction equipment. The method can provide a reference to other relevant study on the the complex machinery system.