Article(id=1242129247356129967, tenantId=1146029695717560320, journalId=1240685776644648972, issueId=1242129246575989412, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1007-7294.2024.01.006, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1689091200000, receivedDateStr=2023-07-12, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1774076290215, onlineDateStr=2026-03-21, pubDate=1705680000000, pubDateStr=2024-01-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1774076290215, onlineIssueDateStr=2026-03-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1774076290215, creator=13701087609, updateTime=1774076290215, updator=13701087609, issue=Issue{id=1242129246575989412, tenantId=1146029695717560320, journalId=1240685776644648972, year='2024', volume='28', issue='1', pageStart='1', pageEnd='168', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1774076290029, creator=13701087609, updateTime=1774080061948, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1242145067209666974, tenantId=1146029695717560320, journalId=1240685776644648972, issueId=1242129246575989412, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1242145067213861279, tenantId=1146029695717560320, journalId=1240685776644648972, issueId=1242129246575989412, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=55, endPage=69, ext={EN=ArticleExt(id=1242129247989469878, articleId=1242129247356129967, tenantId=1146029695717560320, journalId=1240685776644648972, language=EN, title=Energy capture characteristics of nonlinear hinged double floating body wave energy converters, columnId=1241023037940748650, journalTitle=Journal of Ship Mechanics, columnName=Hydrodynamics, runingTitle=null, highlight=null, articleAbstract=
Aiming at the inherent bottleneck of low efficiency and narrow frequency band of energy capture for traditional linear hinged module floating wave energy converters (WEC), a simple negative stiffness mechanism for hinged two-module floating WEC was proposed, which could be used as a passive method to improve the energy capture efficiency. Firstly, a simple and compact negative stiffness device was proposed, which was realized by placing simple stretch elastic elements between articulated floating bodies. Secondly a dynamic model of two-module nonlinear WEC in the time domain was established based on linear wave theory and Cummins equation. At the same time, the convolution integral term induced by wave radiation force was replaced by the state space model to improve the calculation speed. Finally, the numerical simulation of the two-module nonlinear WEC was carried out, and its energy capture characteristics under regular waves were analyzed. The numerical results show that the equivalent natural frequency of the system can be effectively reduced by introducing the nonlinear negative stiffness mechanism. When the negative stiffness mechanism was adjusted to appropriate parameters, the elastic force of the system can form an elliptical potential well in the phase plane of pitch motion, and its long axis is close to the mode direction of pitch motion of the floating module. Thus the pitch motion of the two modules tends to anti-phase and the nonlinear negative stiffness mechanism plays the role of phase control. Due to the above mechanism, the nonlinear negative stiffness mechanism with appropriate parameters can effectively improve the energy capture efficiency and broaden the energy absorption band.
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本文针对传统铰接浮体线性波能转换器捕获效率低、频带窄的固有瓶颈,提出一种可用于铰接浮体波能转换器的简易负刚度机构,可作为一种被动方法提高系统的波能捕获效率。首先,提出一款简单紧凑的负刚度装置,该装置通过在铰接浮体间布置简单的拉伸弹性元件实现;其次,基于线性波浪理论和Cummins方程,建立两模块非线性波能转换器的时域动力学模型,同时为提高计算速度,采用状态空间模型替代表征波浪辐射力的卷积积分项;最后,分析规则波作用下两模块非线性波能转换器的波能转换特性。数值结果表明,通过引入非线性负刚度机构,可有效降低系统的等效固有频率;当负刚度机构调整到适当参数时,系统的弹性力在纵摇运动的相平面上能形成一个椭圆势井,其长轴接近铰接双浮体纵摇运动的模态方向,由此可使两模块的纵摇运动趋于反向,起到被动相位控制的作用。基于上述机理,合适的非线性负刚度结构可有效提高能量的捕获效率和拓宽能量吸收的频带。
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Structure diagram of wave energy converter with nonlinear hinged double floating body, figureFileSmall=tA7BLU6d3lrja7VD1OfjqA==, figureFileBig=mll284NO/lWgUSqWAkdrRA==, tableContent=null), ArticleFig(id=1242129271771173340, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图1, caption=
非线性铰接双浮体波能转换器结构示意图, figureFileSmall=tA7BLU6d3lrja7VD1OfjqA==, figureFileBig=mll284NO/lWgUSqWAkdrRA==, tableContent=null), ArticleFig(id=1242129271955722722, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.2, caption=
Equivalent mechanical model of the nonlinear power take-off system, figureFileSmall=6Dqz6LkKSbop84uPTsQKOw==, figureFileBig=POsjglIKOxchsaAIwXoaig==, tableContent=null), ArticleFig(id=1242129272018637285, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图2, caption=
非线性能量捕获系统等效力学模型, figureFileSmall=6Dqz6LkKSbop84uPTsQKOw==, figureFileBig=POsjglIKOxchsaAIwXoaig==, tableContent=null), ArticleFig(id=1242129272085746152, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.3, caption=
Coordinate systems for two-module system, figureFileSmall=L80P2eLCSs0JcX/Ij2CyEA==, figureFileBig=gK95POTTWbNvYP4ZCCrumQ==, tableContent=null), ArticleFig(id=1242129273553752561, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图3, caption=
双浮体系统坐标系示意图, figureFileSmall=L80P2eLCSs0JcX/Ij2CyEA==, figureFileBig=gK95POTTWbNvYP4ZCCrumQ==, tableContent=null), ArticleFig(id=1242129275520881146, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.4, caption=
System motion diagram, figureFileSmall=9SL/Le4dZQKJYTC5MKo2rQ==, figureFileBig=pf7Gk7s96fqant0mwnDK0A==, tableContent=null), ArticleFig(id=1242129275587990012, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图4, caption=
系统运动简图, figureFileSmall=9SL/Le4dZQKJYTC5MKo2rQ==, figureFileBig=pf7Gk7s96fqant0mwnDK0A==, tableContent=null), ArticleFig(id=1242129275684459010, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.5, caption=
Model design dimensions of the modules, figureFileSmall=93venJagy71wz9PwYX9wCg==, figureFileBig=suYCoWv0quwKL2ZdJrAsfA==, tableContent=null), ArticleFig(id=1242129275772539397, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图5, caption=
浮体模型尺寸示意图, figureFileSmall=93venJagy71wz9PwYX9wCg==, figureFileBig=suYCoWv0quwKL2ZdJrAsfA==, tableContent=null), ArticleFig(id=1242129275860619786, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.6, caption=
Numerical verification of system capture width ratio under different damping coefficients (Incident wave frequency ω*=1.80, connector stiffness
, wave amplitude A* =0.2, spring stiffness
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系统能量捕获宽度比随阻尼系数变化验证图(入射波频率ω* =1.80,连接器刚度
,波浪幅值A* =0.2,弹簧刚度
), figureFileSmall=zxdLBmCJiZkPqXhui55W3A==, figureFileBig=G3QnVgVwmHs+5pDPQKCSOg==, tableContent=null), ArticleFig(id=1242129276045169169, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.7, caption=
Potential energy surface of linear system (Damping coefficient
, wave amplitude A* =0.2, spring stiffness
), figureFileSmall=EcpWRb2fTUZ02v9DO6cu/Q==, figureFileBig=y+CVdMc863EMbquBQ0rQ+g==, tableContent=null), ArticleFig(id=1242129276112278036, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图7, caption=
线性系统势能云图(阻尼系数
,波浪幅值A* =0.2,弹簧刚度系数
), figureFileSmall=EcpWRb2fTUZ02v9DO6cu/Q==, figureFileBig=y+CVdMc863EMbquBQ0rQ+g==, tableContent=null), ArticleFig(id=1242129276196164119, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.8, caption=
Change of potential energy in the direction of pitch freedom under various parameters (Damping coefficient
, wave amplitude A* =0.2), figureFileSmall=xG2OjwKb7nIgHTlgee07Bw==, figureFileBig=vb4AUc75zQCjprwOajMepw==, tableContent=null), ArticleFig(id=1242129276280050202, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图8, caption=
各个参数下纵摇自由度方向的势能变化(阻尼系数
,波浪幅值A* =0.2), figureFileSmall=xG2OjwKb7nIgHTlgee07Bw==, figureFileBig=vb4AUc75zQCjprwOajMepw==, tableContent=null), ArticleFig(id=1242129276372324894, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.9, caption=
Capture width ratio of linear system versus wave frequency and damping coefficient (Wave amplitude A* =0.2, spring stiffness
), figureFileSmall=JGfp81rA+6hVzTE/bJy59Q==, figureFileBig=U0FIUssGYOQ03dOoJIBNjQ==, tableContent=null), ArticleFig(id=1242129276481376802, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图9, caption=
线性系统捕获宽度比随波浪激励频率和阻尼系数变化图(波浪幅值A* =0.2,弹簧刚度系数
), figureFileSmall=JGfp81rA+6hVzTE/bJy59Q==, figureFileBig=U0FIUssGYOQ03dOoJIBNjQ==, tableContent=null), ArticleFig(id=1242129276565262886, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.10, caption=
Variation of capture width ratio with wave excitation frequency (Parameter damping coefficient
, wave amplitude A* = 0.2, the nonlinear system parameters of the spring
, α =0.7), figureFileSmall=8Z+1fytegQC+hi4ePBAn2Q==, figureFileBig=6OD0k0sWh3RkC2PrGGrztA==, tableContent=null), ArticleFig(id=1242129278075212337, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图10, caption=
捕获宽度比随波浪激励频率的变化图(阻尼系数
,波浪幅值A* =0.2,非线性系统弹簧参数为
, α =0.7), figureFileSmall=8Z+1fytegQC+hi4ePBAn2Q==, figureFileBig=6OD0k0sWh3RkC2PrGGrztA==, tableContent=null), ArticleFig(id=1242129278184264247, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.11, caption=
Contour diagram of potential energy and phase diagram of linear system and nonlinear system (Damping coefficient
, spring stretch ratio α =0.7, wave amplitude A* =0.2), figureFileSmall=N35fUrQMltx+ew0dNs+1sw==, figureFileBig=LW9PyBx2LpWy4Z601XuP8Q==, tableContent=null), ArticleFig(id=1242129278259761721, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图11, caption=
线性系统与非线性系统势能曲面与相图(阻尼系数
,弹簧初始拉伸比α =0.7,波浪幅值A* =0.2), figureFileSmall=N35fUrQMltx+ew0dNs+1sw==, figureFileBig=LW9PyBx2LpWy4Z601XuP8Q==, tableContent=null), ArticleFig(id=1242129278335259198, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.12, caption=
Maximum capture width ratio and corresponding peak frequency corresponding to stiffness and initial spring tension ratio (Damping coefficient
, wave amplitude A* =0.2), figureFileSmall=iaJiXwAnSYZLOttKdUlNGQ==, figureFileBig=cs30uQ8Ps2bZ9YPJeypdww==, tableContent=null), ArticleFig(id=1242129278419145284, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图12, caption=
刚度和初始弹簧拉伸比所对应的最大捕获宽度比和相应的峰值频率(阻尼系数
,波浪幅值A* =0.2), figureFileSmall=iaJiXwAnSYZLOttKdUlNGQ==, figureFileBig=cs30uQ8Ps2bZ9YPJeypdww==, tableContent=null), ArticleFig(id=1242129278532391498, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.13, caption=
Pitching potential energy surface and phase trajectory of the system under typical parameters (Damping coefficient
, wave amplitude A* =0.2), figureFileSmall=g1In/RmmWb+Xi7sj7XES4A==, figureFileBig=doajPrOKdc0zQtq+VT+eAQ==, tableContent=null), ArticleFig(id=1242129278612083278, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图13, caption=
典型参数下系统纵摇势能曲面与相轨迹图(阻尼系数
,波浪幅值A* =0.2), figureFileSmall=g1In/RmmWb+Xi7sj7XES4A==, figureFileBig=doajPrOKdc0zQtq+VT+eAQ==, tableContent=null), ArticleFig(id=1242129278670803536, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Fig.14, caption=
Capture width of nonlinear system under various parameters (Damping coefficient
, spring stiffness
, spring stretch ratio α =0.86), figureFileSmall=iU1SlkQpSAlIg2qJqU+KGQ==, figureFileBig=qwFZkkiI5Dkd+jaidaZ6IA==, tableContent=null), ArticleFig(id=1242129278758883923, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=图14, caption=
非线性系统各参数下的捕获宽度(阻尼系数
,弹簧刚度系数
,弹簧初始拉伸比α =0.86), figureFileSmall=iU1SlkQpSAlIg2qJqU+KGQ==, figureFileBig=qwFZkkiI5Dkd+jaidaZ6IA==, tableContent=null), ArticleFig(id=1242129278846964314, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=EN, label=Tab.1, caption=
Main parameters of two-module wave energy converter
, figureFileSmall=null, figureFileBig=null, tableContent=
| 名称 | 符号/单位 | 数值 | 名称 | 符号/单位 | 数值 |
|---|
| 浮体长度 | l/m | 20 | 浮体密度 | ρ0/(kg⋅m-3) | 512.5 |
| 截面长轴长度 | a/m | 5 | 水深 | d/m | 20 |
| 截面短轴长度 | b/m | 2.5 | 浮体间距 | γ/m | 1 |
| 吃水深度 | d1/m | 1.25 | PTO间距 | r0/m | 1 |
), ArticleFig(id=1242129278939239004, tenantId=1146029695717560320, journalId=1240685776644648972, articleId=1242129247356129967, language=CN, label=表1, caption=
两模块波能转换器的主要参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 名称 | 符号/单位 | 数值 | 名称 | 符号/单位 | 数值 |
|---|
| 浮体长度 | l/m | 20 | 浮体密度 | ρ0/(kg⋅m-3) | 512.5 |
| 截面长轴长度 | a/m | 5 | 水深 | d/m | 20 |
| 截面短轴长度 | b/m | 2.5 | 浮体间距 | γ/m | 1 |
| 吃水深度 | d1/m | 1.25 | PTO间距 | r0/m | 1 |
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