Design And Research On Energy Collecting Device Of Directional Marine Monitoring Buoys

Marine monitoring buoy is an important tool to obtain ocean parameters.The traditional marine buoys simply use the battery to carry on the energy supply,which have shortcomings of short working life and inconvenient replacement of the battery.Therefore,the utilization of renewable energy to extend the working life of buoys becomes a hot research spot.This paper presents an energy collecting device located inside the buoy that collects the kinetic energy of the buoy during its shaking on the sea surface and stores the energy as hydraulic energy in the buoy.When the buoy is affected by the wind and waves and needs to adjust its orientation,this device can release the energy to operating the machine and adjust the buoy orientation,so as to achieve the purpose of reducing energy consumption of the battery and extend the working life of the buoy.In this paper,the motion of the buoy under fourth-order sea condition are obtained by means of experiment.The mechanical structure of the buoy energy collecting device and the hydraulic system are designed.This paper shows the energy conversion process,which converts the kinetic energy of the buoy into mechanical energy of the hydraulic cylinder and then transforms to hydraulic energy in the accumulator.Finally,the working principle of the energy collecting device are demonstrated in this paper.After that,this paper simulates the hydrodynamic performance of the pendulum in the flow field of the water tank by CFD numerical simulation method.The simulation results are obtained by calculating the power and the efficiency of the pendulum,indicating that the device has energy capture function.Through the verification of grid independence and actual test,it is proved that the simulation results of the pendulum's hydrodynamic performance are reliable.This paper further analyzes the influence of different parameters on the swing amplitude and power of the pendulum by changing the material of the pendulum,the height of the liquid level in the water tank,the direction and the movement of the buoy,and obtains the optimal parameters of power and swing amplitude.Then,this paper studies the hydraulic system in buoy energy collecting device.The hydraulic simulation is completed by AMESim software to determine the basic parameters of the hydraulic components to meet the requirements of working conditions and obtain the output torque as well as rotation angle of hydraulic motor.Then,according to the hydraulic system designed in this paper,the actual load damping force of the hydraulic cylinder is obtained,and the pendulum movement in the flow field is re-simulated to obtain the actual swing under the calculated load damping.Finally,this paper builds the actual model of the water tank and the pendulum.The Stewart platform is used to simulate the buoy's shaking on the sea surface,and the damping moment of the pendulum in the flow field is obtained.Experimental results prove that the buoy energy-collecting device proposed in this paper can effectively capture the energy during buoy shaking.