Structure Optimization Of A Floating Wavepower Acquisition Device

This paper analyzed the energy collection efficiency of a float-type wave power generation platform named “Jida 2”.Firstly,he existing problems of this platform were analyzed with the help of numerical simulations using AQWA and the offshore experiments.Subsequently,the influence of the structure of the energy collection system,including the positions of the floaters on the platform,the angles of the swing arms,damping and mass of the floaters,to the energy collection efficiency was analyzed.This study provides some theoretical references to the further research on the float wave energy system.The content and results of this study was given as follows:(1)The calculation method and the capture width ratio was deduced and analyzed firstly,aiming at acquiring the theoretical references for the numerical analysis.(2)The energy collection efficiency of “Jida 2” was numerically analyzed with the help of the Marine Engineering Design Software of AQWA,the energy collection efficiency of the floaters and the capture width ratios in different wave frequencies were studied.The results indicate that: the energy collection efficiency of this system increases with the increase of the wave frequency.for the energy collection array with five floaters,the first floaters facing the waves has the highest energy collection efficiency,while,performing of the third one is the worst.due to the wave attenuation effect among the floaters,the energy collection efficiency of the floaters decreases in the direction of the wave.(3)The wave power energy system of “Jida 1” was optimized,the offshore tests of “Jida 2” were conducted,and the experimental results was analyzed.It is found that: the interference among the floaters is reduced when the floaters are arranged staggerly.it is 15.6% of the highest energy collection efficiency of the 3# floater with the longest swing arm of 3.1 m,which is arranged in the center of the system,the highest efficiency of #4 is 17.5% which has a wing arm of 2.45 m long and is arranged behind #3 floater.the results show that the power generated by “Jida 2” is more stable than “Jida 1”.(4)Based on analysis of the results of the numerical simulation and the offshore tests,the wave energy collection system of “Jida 2” was further promoted.The energy collection efficiency was studied by changing the the positions of the floaters on the platform,the angles of the swing arms,damping and mass of the floaters.The results show that: the energy collection efficiency of the floater is the best when it is arranged in the wedge-shaped bow section.the average efficiency of the floaters decrease with the increase of the damping when the damping ranges from 200 N.m to 3000 N.m.the efficiency of the floater is the highest when the swing angle is 60°.for “Jida 2”,the efficiency increases with the mass of the floater when the mass ranges from 500 kg to 1500 kg.the efficiency increases with the increase of the length of the swing arm.