The Analysis And Test Of The Hydraulic System In Multi-point Buoy-bydraulic WEC

The coming energy crisis and increasing environmental pollution have caused people’s energy concerns. In recent years, the world’s attention on renewable energy are more and more. Ocean wave energy can be considered to be the world’s great potential renewable energy. Its energy density is much larger than solar and wind energy, thus the development of wave energy conversion device is promising.The paper is based Ocean State Oceanic Administration of special funds projects for renewable energy "sea wave energy and wind energy generation development platform". It mainly studied the status quo and the principles of sea wave power generation device. Muti-point Buoy-Hydraulic wave power generation device is a new type of offshore wave energy development platform. The device employ the hydraulic oil system as a middle conversion and storage devices, and it effectively overcome the shortcomings that the power output of the current wave energy device fluctuates largrly, meanwhile it makes use of the float arm and pivot to make the hydraulic cylinder output pressure oil higher and flow bigger. Thereby it enhances the conversion efficiency of the hydraulic system.In the designation of20kW prototype platform, wave factors and float parameters are given wave, and force, displacement, velocity, acceleration of the piston rod are fitted, so the hydraulic cylinder bore and piston rod diameter can be selected, then the pressure and flow of the hydraulic cylinder output high pressure oil can be calculated, and also the average pressure and the average flow rate. Next calculating the losses, hydraulic motor inlet pressure and flow can be resulted, and then select the range of displacement, the output torque, speed, integrated stress, displacement, torque torque, speed can be obtained. And compare different models to determine the final selection results.In the thesis, the hydraulic system simulation modeling module theory is deeply studied, the hydraulic system components and their models and modeling tools SimHydraulics are analyzed. Meanwhile the hydraulic cylinder system sub-model and the motor in the workflow simulation, the basic hydraulic components model based on Simulink environment are researched in detail.Based on the wave factors of the selected waters and float parameters, mathematical model, dynamic performance and workflow of the hydraulic cylinders, accumulators, hydraulic motor are respectively determined. Compare the output of hydraulic cylinders, flow obtained by Simulink model simulation with the results through calculating, the both the results provide a reference for the selection of the hydraulic cylinders prototype. For the hydraulic motor, through the simulation of Simulink model, the hydraulic motor output speed, torque, power can be obtained, and comparing with the calculation results, both provide reference for the the selection of the hydraulic motor in the prototype.