基于小波变换的顶张力立管涡激振动规律实验研究  

Model tests for vortex-induced vibration of a top tension riser based on wavelet transformation

作　　者：张永波[1] 郭海燕[1] 孟凡顺[2] 刘晓春[1] 

机构地区：[1]中国海洋大学工程学院,青岛266071 [2]中国海洋大学海洋地球科学学院,青岛266071

出　　处：《振动与冲击》2011年第2期149-154,185,共7页Journal of Vibration and Shock

基　　金：国家高技术研究发展计划(863计划)(2010AA09Z303和2007AA09Z313)

摘　　要：为研究顶张力立管在海流作用下的涡激振动规律,在大型波浪流水槽中进行涡激振动模型实验。实验中立管竖直固定于实验支架上,外部承受不同速度的流体作用,上端施加变化的顶张力。立管模型上均匀布置六个测点,根据每个测点布置的两个应变计,分别测得来流向和横向两个方向振动响应。通过小波变换方法对实验数据进行时间频域分析,得到立管涡激振动频率和振动幅值以及来流向与横向的耦合振动规律,考察顶张力变化对立管自振频率以及涡激振动的影响。In order to study vortex-induced vibration（VIV） characteristics of a top tension riser subjected to marine current,model tests of VIV were conducted in a large wave-current flume.The riser model with changing top tension was attached vertically to the supporting structure and external current with different velocities acted on the model.The cylindrical model was equipped with six measured stations distributing averagely along the riser and each of them had two strain gauges to measure the oscillation responses both in-line direction and cross-flow one.Through wavelet transformation analysis,VIV frequencies and amplitudes as well as the coupled vibration law between X and Y directions were obtained.The effect of varying top tensions on the natural frequencies and VIV response of the riser were also investigated.

关 键 词：顶张力立管 涡激振动 模型实验 小波变换 

分 类 号：O324[理学—一般力学与力学基础]