基于随机子空间法的海洋平台模态特征实时提取方法研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (3) : 147-155.

论文

黄焱1，陈涛1，朱本瑞2

作者信息 +

Modal features real-time extraction of offshore platform based on stochastic subspace method

HUANG Yan1, CHEN Tao1, ZHU Benrui2

Author information +

文章历史 +

摘要

海洋平台结构模态特征实时提取是其结构健康监测的一项重要手段。针对传统随机子空间算法在有限测点下无法反映结构整体特征的问题，提出了一种改进的协方差驱动随机子空间模态实时提取方法。该方法基于一种新的Hankel元素重构方式，构建了结构实际空间信息与算法的相关性，并有效降低了计算矩阵的维度，从而显著提高了平台模态识别的准确度和计算效率。在此基础上，进一步建立了基于信号累积特征的虚假模态辨识方法与剔除准则，解决了传统随机子空间方法在计算大型复杂结构时存在虚假模态过多的问题。以渤海某海洋平台为例，采用所建立的方法对该平台响应信号进行计算，并与传统随机子空间方法进行对比分析，验证了本文所提方法的优良适用性和鲁棒性。

Abstract

Real-time extraction of structural modal features is an important means of structural health monitoring. Aiming at the problem of the traditional stochastic subspace algorithm being not able to reflect overall characteristics of a structure under finite measuring points, an improved covariance-driven stochastic subspace modal features real-time extraction method was proposed. Firstly, based on a new Hankel element reconstruction form, the correlation between the actual spatial information of a structure and the algorithm was constructed, and the dimension of the calculation matrix was effectively reduced to significantly improve the accuracy and efficiency of the platform modal identification. Then, the identification method and elimination criteria of false modes based on signal accumulation characteristics were further established to solve the problem of excessive false modes in the calculation of large-scale complex structure with the traditional stochastic subspace method. Finally, taking an offshore platform in Bohai Sea as an example, the response signals of the platform were calculated using the proposed method, and the results were compared with those obtained using the traditional stochastic subspace method to verify the excellent applicability and robustness of the proposed method.

导出引用

黄焱1，陈涛1，朱本瑞2. 基于随机子空间法的海洋平台模态特征实时提取方法研究[J]. 振动与冲击, 2021, 40(3): 147-155

HUANG Yan1, CHEN Tao1, ZHU Benrui2. Modal features real-time extraction of offshore platform based on stochastic subspace method[J]. Journal of Vibration and Shock, 2021, 40(3): 147-155

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