Research On Hydraulic System Of Buoy-Rope-Drum Wave Energy Device

As a green and renewable energy,wave energy plays an important role in solving problems of environmental pollution and energy shortage.At the same time,compared with other clean energy sources,wave energy has high energy density,large reservation and wide distribution.It has broad application prospects in the fields of powering marine instrumentation and islands.Buoy-Rope-Drum wave energy device is a typical oscillating float wave energy device,which has the characteristics of simple structure,strong survivability,and low cost.However,after the previous research,it was found that the direct-drive Buoy-Rope-Drum wave energy device,which use the spring to retract the rope,has the problems of rope abrasion and weak rope taking-up ability.Therefore,this thesis proposes a new type of Buoy-Rope-Drum wave energy device,which use hydraulic cylinders to take up the rope and capture wave energy.Use OrcaFlex and AMESim digital simulation technology to optimize the program.The main content is as follows:(1)This thesis proposes a hydraulic system scheme of Buoy-Rope-Drum wave energy device,using hydraulic cylinders instead of springs to take up the rope,using a guide rod mechanism to replace the rope guide.Solved the problem of rope abrasion and weak rope taking-up ability in early wave energy device.In addition,the impact of tidal range is reduced with the help of moving pulley technology.The output of electric energy will be more stable because of the storage effect of the hydraulic system.(2)Using the joint simulation technology of OrcaFlex and AMESim,the secondary conversion energy of the new Buoy-Rope-Drum wave energy device is calculated through secondary development.Taking the highest average output power of the hydraulic motor of the device under regular wave conditions as the goal,optimize the hydraulic system scheme by iterative simulation.(3)This thesis proposes a program of supercharging system,which can generate electricity under small waves.Use AMESim to realize the simulation of the supercharging system under small wave conditions through secondary development.Taking the maximum average output power in small waves as the goal,optimize the booster system.At the same time,in order to reduce the start frequency of hydraulic motors and generators in small waves,optimize the volume of the accumulator.(4)Combined with the research group’s early-stage simulation experiment platform of Buoy-Rope-Drum wave energy device,propose an improvement plan for the hydraulic system test platform.Use AMESim to simulate and optimize the design of the improvement plan,and design the follow-up test method and step of hydraulic system.