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本文引用格式:隋国策,段梦兰,武晓东.细长圆柱体涡激振动行波动力学特征的实验研究[J].动力学与控制学报,2019,17(6):546~552;   Sui Guoce,Duan Menglan,Wu Xiaodong.Experimental study on the dynamic features of traveling wave of vortex induced vibration of a long slender cylinder[J].Journal of Dynamics and Control,2019,17(6):546-552.
细长圆柱体涡激振动行波动力学特征的实验研究    点此下载全文
隋国策  段梦兰  武晓东
复旦大学 航空航天系, 上海 200433,复旦大学 航空航天系, 上海 200433;中国石油大学(北京)
〖KG*2〗海洋工程研究院, 北京 102249,太原理工大学 力学学院, 太原 030024
基金项目:国家自然科学基金(11702185),山西省高校创新科技项目(173230113-S)
DOI:10.6052/1672-6553-2019-016
摘要:
      通过实验研究给出了细长圆柱体涡激振动行波的动力学特征.实验是在拖曳水池中进行.为了能在拖曳水池宽度有限的情况下出现行波,采用实验模型为0.006m直径、3.31m长度的铝管,模型长径比超过了500.拖车拖动模型以最高1.5m/s的速度在水槽中行进.模型一端采用2.5kg的砝码来提供端部张力.给出了评估行波在整个振动波中所占比例的方法.该方法采用行波圆来拟合模型空间振幅的分布.实验结果显示,在给定的拖车速度范围内,出现了行波振动,并且当拖曳速度达到0.9m/s时,行波现象非常显著.实验结果给出了振动波随拖曳速度变化的规律,得到了行波比随流速的变化规律.实验中观察到了低阶模态下的行波传播,这超出了已有行波判据限定的范围.通过实验数据的观察和理论分析,给出一种新的行波产生方式.
关键词:涡激振动,行波,行波比,实验研究,动力学特性
Experimental study on the dynamic features of traveling wave of vortex induced vibration of a long slender cylinder    Download Fulltext
Sui Guoce  Duan Menglan  Wu Xiaodong
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Abstract:
      Experimental results of dynamic features of traveling wave of vortex-induced vibration(VIV) of a long slender cylindrical structure were given. The experiments were carried out in a water tank. In order to observe the occurrence of travelling wave in the tank of limited width, the aluminum pipe of 0.006 m in diameter and 3.31 m in length was used, so the aspect ratio of model is over 500. The structure was dragged by a trailer whose velocity can reach 1.5m/s. The weight of 2.5kg was employed to provide the end tension. A method that was used to assess the contribution of traveling in whole vibration waves was introduced. The traveling wave ellipse was employed to fit the distribution of the amplitudes of vortex induced vibrations along the length of the model. The experimental results show that, the traveling wave appeared over a given velocity range and when the velocity was 0.9m/s, the traveling wave was notable. Except the velocity is 0.9m/s, the traveling wave ratio is around 0.2. Result showed the travelling wave under low mode was observed, this is beyond the limit defined by travelling wave criterion. Finally based on observation of experimental data and theoretical analysis, a new traveling wave formation phenomenon was given.
Keywords:vortex-induced vibrations,traveling wave,traveling wave ratio,experimental study,dynamic features
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