基于小波变换的顶张力立管涡激振动规律实验研究

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (2) : 149-154.

论文

基于小波变换的顶张力立管涡激振动规律实验研究

张永波1;郭海燕1;孟凡顺2;刘晓春1

作者信息 +

Experimental Investigation of Vortex-Induced Vibration of Top Tension Riser based on wavelet transform

ZHANG Yong-bo1;GUO Hai-yan1; MENG Fan-shun2;LIU Xiao-chun1

Author information +

文章历史 +

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。

Abstract

In order to research the Vortex-Induced Vibration (VIV) characteristics of top tension riser subjected to marine current, modal tests of VIV were conducted in a large wave-current flume. The model riser with changing top tension was attached vertically to the supporting structure and different external current velocities acting on the model. The cylinder model was equipped with six measured stations which are distributed averagely along the riser and each was formed by two strain gauges to measure both in-line direction and cross-flow direction oscillation responses. Through wavelet transform analysis, VIV frequencies, amplitudes of oscillation and coupling vibration rule between X and Y motions were obtained. The effect of varying top tensions on the natural frequency and VIV response were investigated.

导出引用

张永波;郭海燕;孟凡顺;刘晓春. 基于小波变换的顶张力立管涡激振动规律实验研究[J]. 振动与冲击, 2011, 30(2): 149-154

ZHANG Yong-bo;GUO Hai-yan;MENG Fan-shun;LIU Xiao-chun. Experimental Investigation of Vortex-Induced Vibration of Top Tension Riser based on wavelet transform[J]. Journal of Vibration and Shock, 2011, 30(2): 149-154