| Since the 18 th National Congress of the Communist Party of China proposed the strategy of building a maritime power,it has become an important part of China’s comprehensive construction of a modern socialist power.To develop and utilize the ocean,we must first fully understand and master the key information of the ocean and the observation of the marine environment with drifting buoys will provide critical information for the development or protection of the ocean.In view of the limited energy storage and difficult independent energy supply of abandoned drifting buoy,how to use wave energy locally to supply power to the buoy has become the key issue whether the drifting buoy can work continuously.The development and utilization of wave energy is also in line with the development concept of carbon peaking and carbon neutralization in China.In this paper,the abandoned drifting buoy is taken as the research object.A heave inertial wave energy device is designed.Through theoretical methods and land experiments,the inherent characteristics and hydrodynamic performance of wave energy power generation device are studied.This paper establishes the mathematical model of the inertial wave energy device,and predicts the possibility of self-supplying energy of the drifting buoy under ocean wave conditions.Aiming at the problems of limited energy storage and difficult independent energy supply of abandoned meteorological drifting buoy,a heave inertial wave energy device is designed.In this part,two generations of prototypes are tried.The advantages and disadvantages of the two generations of prototypes are analyzed.The working principle of the prototype is explained combined with the structure of the prototype.Through theoretical calculation and experimental comparison,it is determined that the natural frequency of the wave energy device is 1.49 hz.Through damping experiment,it is determined that the wave energy device belongs to underdamped system,the damping ratio is 0.226 and the damping is 27.204 N·s/m.The coupling scheme of inertial wave energy power generation device and buoy is designed,and the advantages of the design scheme are analyzed.The theoretical model of inertial wave energy device is established and its reliability is verified.Under the given working conditions,the vibrator motion and power generation of inertial wave energy device are calculated by theoretical analysis method.Under the same conditions,the motion of each part of the device is analyzed by COMSOL.The six degree of freedom motion platform is used to simulate the working condition and the prototype is made for land experiment.Relative displacement and output voltage curve of the vibrator of the device are measured.By comparing the results of theoretical method,simulation and experiment,the correctness of the theoretical model is verified.This paper establishes a complete and reliable theoretical calculation method of inertial wave energy device.It can guide the design and optimization of inertial wave energy power generation device.Through the combination of simulation and theoretical methods,the power generation of wave energy power generation device in marine wave environment is predicted.Level 1 ～ 5sea conditions are selected in which the buoy works normally,and STARCCM+ is used to simulate the hydrodynamic performance of the buoy which is coupled with the wave energy device under the target sea state,focusing on the motion response of the buoy in the heave direction.The heave motion will be input as an initial parameter into the theoretical calculation method of the inertial wave energy device to calculate the motion and output power of the heave inertial wave energy power generation device.From the results of output power,the power of wave energy device is the largest under level 2 sea state,which can reach about 2.55 W.Under level 1 sea state,it is second only to level 2 sea state.The output power gradually decreases under level 3,4 and 5 sea state,and the output power is about 0.5W under level 5 sea state.Through the method of simulation and theory,it is concluded that the inertial wave energy power generation device can meet the energy requirements of buoys and other similar small marine floating bodies. |
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