| Energy is related to a country's development and lifeline.It is not only an important material guarantee for national economic development,but also an important necessity for people's quality of life.With the development of economy and the increase of world population,the demand for energy is increasing.However,the shortage of traditional fossil energy and the increasingly prominent environmental problems force people to focus on the field of marine energy.As a kind of marine energy resources,wave energy has many advantages,such as abundant reserves,wide distribution,clean and pollution-free.China is a coastal country with abundant ocean wave energy resources.It is of great significance to develop ocean wave energy resources to alleviate the energy pressure in China.According to the distribution characteristics of wave energy resources in China's coastal areas,it is more suitable to install pendulum wave energy power generation device.The floating pendulum wave energy power generation device is one of the pendulum wave energy devices,which has the characteristics of simple and reliable structure,convenient installation and maintenance,which is a good choice for China's coastal areas and many offshore islands.This paper first introduces the principle and classification of wave power generation devices,and summarizes the current research status of wave power generation technology at home and abroad.Then,the two methods of hydrodynamics research,the basic properties and parameters of wave energy are briefly introduced.The micro amplitude wave theory commonly used in the analysis of wave energy generation device is introduced,and the potential function and boundary conditions of wave motion are listed.Based on the micro amplitude wave theory,the force analysis of floating pendulum wave energy generation device in frequency domain and time domain is carried out.According to the previous research results,a kind of floating pendulum device with asymmetric structure is designed,in which the front wave surface is elliptical and the back wave surface is circular.The hydrodynamic coefficient is calculated by simulation,and compared with the device with circular section.It is proved that the device with elliptical circular section has better hydrodynamic performance.Then,the influence of different water depth,submergence depth and device asymmetry on the hydrodynamic performance of the device is analyzed by frequency domain simulation.The results show that the water depth,submergence depth and asymmetry of the device have certain influence on the hydrodynamic performance of the device.When the water depth is 5.0m,the submergence depth is 0.5m and the asymmetry is2.0,the hydrodynamic performance of the device is better.Finally,the pitching model of the elliptical circular section device is simulated in time domain.Considering the wave period and the damping coefficient of the PTO,the effects of different wave periods and the damping coefficient of the PTO on the motion response,the exciting force distance and the instantaneous power of the device are analyzed.The results show that when the wave period is 2.0s and the damping coefficient of PTO is 3000Nsm/rad,the motion response and instantaneous power performance of the device are better.The simulation results in frequency domain are compared with those in time domain to verify the rationality and reliability of the model.It lays a foundation for further research in the future. |
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