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力学学报  2014 

正弦振荡来流下柔性立管涡激振动发展过程

DOI: 10.6052/0459-1879-13-277, PP. 173-182

Keywords: 涡激振动发展过程,振荡来流,柔性立管,最大约化速度

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Abstract:

在风浪流的作用下,海洋浮式结构物将带动悬链线立管在水中作周期性往复运动,从而在立管运动方向上产生相对振荡来流,这种振荡来流将激励立管悬垂段发生“间歇性”的涡激振动.在海洋工程水池中对一个4m长的立管微段进行模型试验研究,以探索相对振荡来流作用下立管涡激振动产生的机理及其发展的物理过程.试验通过振荡装置带动模型作正弦运动来模拟不同最大约化速度URmax、不同KC(Keulegan-Carpenternumber)的相对振荡来流,利用光纤应变片测量立管涡激振动响应.结合模态分析方法处理试验数据得到位移响应时历,继而提出相对振荡来流下柔性立管涡激振动发展的3个阶段建立阶段、锁定阶段以及衰减阶段.并进一步总结了最大约化速度URmax,KC对涡激振动发展过程的影响规律.最终获得不同最大约化速度URmax下,涡激振动各发展阶段随KC所占时间分布比例图.

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