摘要
针对圆柱体在大长细比、多模态振动及高雷诺数情况下出现较大变形时的非线性效应,建立了双自由度耦合模型,并采用ANSYS/CFX软件对不同质量比的圆柱体两向涡激振动进行数值模拟,探讨了两种典型质量比圆柱体在不同约化速度下的位移响应、两向频率比等特征规律。研究表明,低质量比圆柱体具有更大的锁定区范围和更加剧烈的共振现象。同时,低质量比圆柱体在锁定区范围内呈现出更加复杂的双向耦合规律,而高质量比圆柱体振动规律则相对稳定。探讨了质量比对"拍"、"相位开关"等涡激振动现象特征参数的影响,结果表明,"拍"现象的出现与质量比无直接关系,而质量比的大小可能对"相位开关"现象是否出现具有决定性影响。
Aiming at multi-mode vortex shedding and reduced velocity by the cylinder with large length-diameter ratio, a 2-DOF coupled model was established, and numbers of simulation of vortex-induced vibration of cylinders with different mass ratios are performed based on the software Ansys/CFX. It is shown that the cylinder with lower mass ratio has a larger "lock-in" region and has more complicated coupled rules, while the one with higher mass ratio vibrates much more stably. Influence of the mass ratio on the characteristic parameter of the VIV phenomenon, such as "beats","phase switch" is discussed. It is indicated that the mass ratio might be the decisive factor for the phase switch phenomenon, but not significantly related to the occurrence of the beats.
作者
魏东泽
白兴兰
黄维平
常爽
WEI Dongze;BAI Xinglan;HUANG Weiping;CHANG Shuang(Ocean University of China,Qingdao 266100,China;Zhejiang Ocean University,Zhoushan 316000,China)
出处
《中国造船》
EI
CSCD
北大核心
2019年第1期154-161,共8页
Shipbuilding of China
关键词
质量比
涡激振动
位移响应
频率
质心轨迹
mass ratio
vortex-induced vibration
displacement response
frequency
trajectory of the centre of mass
