一种隔水管涡激振动检测新算法  

A Novel Algorithm for Riser Vortex-induced-Vibration Detecting

作　　者：李保军[1] 王海燕[1] 申晓红[1] 朱梦阳[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《计算机测量与控制》2011年第6期1273-1277,共5页Computer Measurement &Control

基　　金：国家科技重大专项海洋深水油气田开发工程(2008ZX05026)资助

摘　　要：涡激振动(Vortex induced Vibration,VIV)是导致深水隔水管疲劳的主要诱因,振动位移或位移均方根是隔水管VIV监测的主要参数;针对VIV检测问题,提出了基于自相关矩阵分解的VIV频率和位移检测算法;给出了隔水管VIV检测模型,利用自相关矩阵分解算法检测出信号的频率以及相应的振幅,然后重构隔水管VIV响应位移的时间历程,得出位移或者均方根;仿真结果表明:与现有的Welch位移检测算法相比,基于自相关矩阵分解的VIV检测算法具有精度高,适用性广,实用性强等特点。Vortex induced vibration （VIV） is the main issue that results in structural failure and fatigue damage of marine riser. Vibration displacement and its root mean square are the important parameters for riser VIV monitoring. The detection algorithm, for frequency and displacement of VIV, based on self--correlation matrix decomposition was presented. Signal model of riser VIV responses is important. The paper aims at using the novel VIV detection algorithm to estimate VIV frequency and amplitude of acceleration and then reconstruct riser VIV response displacement along time history, at last, estimate VIV response root mean square （RMS） displacement. The simulation re- sults show that the above method, compared with the Welch method, has higher accuracy on VIV monitoring, and is applied to some condi- tions that the SNR is low.

关 键 词：隔水管 涡激振动 相关阵分解 响应重构 

分 类 号：TH873.7[机械工程—仪器科学与技术]