| Ocean waves contain enormous energy,and the use of ocean waves for power generation is economical and effective,does not consume any resources and fuel,and does not occupy any land.The rational exploitation and utilization of wave energy is of great practical value.Therefore,it has become a hot spot in the research and development of marine new energy at this stage.As a kind of ocean wave power generation device,the floating wave power generation device is flexible and small and cheap to put in place,which weakens the stringent requirements for sea conditions.Countries in the world have regarded it as the research focus of future wave power generation technology.This paper proposes a wave energy convertor consisting of a twin-pontoon floating body and a damped vertical plate for the small floating wave energy convertor.It studies the power generation technology of the twin-pontoon wave energy device and explores the device through simulation and prototype experiments.Energy capture characteristics and power generation feasibility.Firstly,this paper introduces the fundamental theory of wave,analyzes the motion mechanism of the WEC based on the panning motion of the floating body,and establishes the mathematical model of the panning motion of the floating body in waves based on the theory of micro-waves and the principle of wave resistance.For the WEC using floating body roll,this paper proposes a new twin-pontoon type wave energy converter that can be applied to the low sea conditions in the offshore area,and introduces its basic structure and power generation principle.In the case of considering only the rolling of twin-pontoon floats,it is assumed that the PTO system is linear,and the mathematical model of the buoyant body moving in the wave is established.And the equivalent rotational damping coefficient of the rotatory damper is considered to be the influencing factor.Based on the FLUENT software,the moving load and the average power generation of the floating body with different working conditions are analyzed,and the hydrodynamic performance of the floating body under four attack angles of 0°?5°?10°?15°is compared.The simulation results show that when the equivalent rotational damping coefficient of PTO is 9s-1,the device has the maximum average output power.Aiming at the characteristics of the device in low power density and low sea state,the mechanical transmission mode of PTO system is determined.The power generation system consists of the reversing gear box,the speed increasing device,the coupling,the alternator and so on.Considering the characteristics of rolling motion of floating body,a bidirectional variable unidirectional gear box is designed as the input port of PTO system.The bidirectional rotation of input shaft is converted to unidirectional rotation of output shaft to make use of it.Based on ADAMS software,the simulation and optimization of reversing gearbox and speed increasing box were completed,and the 35:1 transmission ratio of the speed increasing gear was determined and the working requirements of the generator were satisfied.The prototype and experimental study of twin-pontoon wave energy converter were carried out.According to the structural and strength design requirements,the prototype of the device is completed,and the prototype experiment is completed with two parts:the waterless test bench and the simple water tank.First,an experimental set of waterless wave power generation system was set up to conduct power generation experiments on twin-pontoon wave energy converter under secondary sea conditions.Afterwards,the prototypes were completed in a simple water tank that was manufactured from wave machines.The pool experiment showed that the device had certain power generation feasibility and working ability under low sea conditions. |
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