Evaluation of the Double Snap-Through Mechanism on the Wave Energy Converter’s Performance  

双重卡口机构对波浪能转换器性能的影响评估

作　　者：Bingqi Liu Carlos Levi Segen F.Estefen Zhijia Wu Menglan Duan 

机构地区：[1]Ocean Engineering Department,COPPE,Federal University of Riode Janeiro,Rio de Janeiro 21945-970,Brazil [2]China Ship Scientific Research Center,Wuxi 214082,China [3]College of Safety and Ocean Engineering,China University of Petroleum-Beijing,Beijing 102249,China

出　　处：《Journal of Marine Science and Application》2021年第2期268-283,共16页船舶与海洋工程学报（英文版）

基　　金：supported by the China Scholarship Council under Grant No.201600090258;the National Key Research and Development Program of China under Grant No.2016YFC0303700;the 111 Project under Grant No.B18054。

摘　　要：Lower efficiencies induce higher energy costs and pose a barrier to wave energy devices'commercial applications.Therefore,the efficiency enhancement of wave energy converters has received much attention in recent decades.The reported research presents the double snap-through mechanism applied to a hemispheric point absorber type wave energy converter(WEC)to improve the energy absorption perfomance.The double snap-through mechanism comprises four oblique springs mounted in an X-configuration.This provides the WEC with different dynamic stability behaviors depending on the particular geometric and physical parameters employed.The efficiency of these different WEC behaviors(linear,bistable,and tristable)was initially evaluated under the action of regular waves.The results for bistable or tristable responses indicated significant improvements in the WEC's energy capture efficiency.Furthermore,the WEC frequency bandwidth was shown to be significantly enlarged when the tristable mode was in operation.However,the corresponding tristable trajectory showed intra-well behavior in the middle potential well,which induced a more severe low-energy absorption when a small wave amplitude acted on the WEC compared to when the bistable WEC was employed.Nevertheless,positive effects were observed when appropriate initial conditions were imposed.The results also showed that for bistable or tristable responses,a suitable spring stiffness may cause the buoy to oscillate in high energy modes.

关 键 词：Wave energy converter Point absorber Double snap-through mechanism Bistable dynamic behavior Tristable dynamic behavior 

分 类 号：P743.2[天文地球—海洋科学] TM612[电气工程—电力系统及自动化]