Dynamics of Bridges, Volume 5 - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010
Dynamics of Bridges, Volume 5 - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010
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桥梁动力学，第 5 卷 - 第 28 届 IMAC 会议记录，结构动力学会议，2010 年
DOI：
10.1007/978-1-4419-9825-5_3
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Cross E
中科院分区：
文献类型：
--
作者：
Cross E
对于结构健康监测的目的，它已成为非常重要的理解，建模，并补偿的影响，环境变化的动态特性的结构在其周围的操作条件下。在本文中，从添马舰悬索桥，英国，由数据驱动的随机子空间识别方法处理的加速度测量数据进行了研究，和环境变化的自然频率建模相对于温度和风荷载。考虑了两种不同的方法; 1）主成分分析（PCA），其有效地识别由环境影响引起的线性变化模式;以及2）元建模，一种基于多项式函数的各种组合来找到系统的输入-输出关系的纯数学方式。研究发现，温度是桥梁自振频率环境变化的最大贡献者。
For structural health monitoring purposes, it has become extremely important to understand, model, and compensate for the effect of environmental variations on the dynamic characteristics of structures under their ambient operating conditions. In this paper, acceleration measurement data from the Tamar Suspension Bridge, UK, processed by the data-driven stochastic subspace identification method is investigated, and the environmental variations in the natural frequencies modelled with respect to the temperature and the wind loadings. Two different approaches are considered; 1) Principal Component Analysis (PCA) which effectively identifies a linear variation pattern induced by environmental effects and 2) meta-modelling, a purely mathematical way to find an input-output relationship of a system based on various combinations of polynomial functions. This study found that the temperature was the biggest contributor to the environmental variations of the bridge’s natural frequencies.