单自由度圆柱涡激振动特性及其影响因素分析  

Analysis on the Characteristics of Single-Degree-of-Freedom Cylindrical Vortex-Excited Vibration and Its Influencing Factors

作　　者：袁方正 袁德奎[1] 曾攀 刘长根[1] YUAN Fang-Zheng;YUAN De-Kui;ZENG Pan;LIU Chang-Gen(School of Mechanical Engineering, Tianjin University, Tianjin 300354, China)

机构地区：[1]天津大学机械工程学院力学系,天津300354

出　　处：《中国海洋大学学报（自然科学版）》2020年第8期115-122,共8页Periodical of Ocean University of China

基　　金：装备预研领域基金重点项目(6140311010102)资助。

摘　　要：对二维刚性圆柱涡激振动进行了系统理论和数值模拟研究,对比了不同因素下圆柱振幅、锁定区间、升阻力系数等关键参数和特征,探究了影响圆柱涡激振动特性的因素。通过线性化分析推导出了锁定区间柱体响应的频率比、振幅与流体荷载和系统物性参数之间的定性关系。为检验理论分析结果,对相关经典实验的结果进行了整理,并用RANS模型开展了相应的数值模拟。理论分析、实验和数值模拟三者的结论相符,可以确认以下结论:当圆柱处在锁定状态时,其振幅大小由组合因子决定。组合因子越小,圆柱的振幅越大,反之则越小,但是组合因子对振幅的影响幅度有限;柱体锁定区间范围的大小由质量比决定,质量比越小,锁定范围越大,反之则越小,质量比对锁定区间范围的大小有显著影响,影响的主要范围是在约化速度较大一端。Which is based on RANS turbulence model of 2D rigid cylindrical vortex-induced vibration of numerical simulation,compares the hydrodynamic coefficient of amplitude,locking range,and other key parameters and characteristics,to explore the influence factors of the cylindrical vortex-induced vibration characteristics.In this paper,the linear decomposition of fluid force is derived to obtain the qualitative relationship between the frequency ratio,amplitude and fluid force and system physical parameters.To generalize the conclusion of the related classic experiment,by means of numerical calculation for mutual authentication,obtained the related conclusion when cylinder is in a locked state,its amplitude is determined by the combination of factor.The smaller combination factor is,the greater the amplitude of the lock range is;The length of the cylinder lock interval is determined by the mass ratio.The smaller the mass ratio is,the larger the locking range is.The mass ratio has a significant influence on the size of the lock interval range,and the main range of influence is at the end of the reduction speed.

关 键 词：涡激振动 质量比 质量阻尼比 线性化分析 数值模拟 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]