欧拉影像放大算法在桥梁风致振动的研究及应用
发布时间：2018-11-01 17:39
【摘要】：桥梁与风之间的相互作用引发了桥梁的风致振动,对大跨度桥梁产生了巨大的影响,是桥梁设计的重要考虑因素。现有的桥梁风致振动研究方法主要研究了风对桥梁的作用,本文基于的欧拉影像放大算法,通过对试验视频进行微小变化放大来研究对桥梁对风的作用。从现有的桥梁风致振动问题出发,本文系统地研究了风致振动的理论基础及相关技术,采集风洞中桥梁节段模型在一定风环境下风洞试验中的流迹显示视频并进行稳像处理,通过选择合适的视频图像分解和重构技术,采用小波等时域分析方法针对视频中的不同变化细节进行选择性放大处理,并通过调整欧拉影像放大算法(Eulerian Video Magnification)中滤波范围和放大倍数等参数,以达到最佳的放大效果。本文在风洞中对某双塔斜拉桥的节段模型进行了丝线法和烟流法两种方法的流迹显示试验,选取在不同风攻角下的烟流法试验视频作为放大对象,通过视频校准算法进行了稳像处理,采用基于小波变换的方法进行图像分解和重构,对欧拉影像放大算法中的一些可调因素进行讨论,确定了针对该桥风致振动问题的滤波频率范围和最佳放大倍数。
[Abstract]:The interaction between the bridge and the wind causes the wind-induced vibration of the bridge, which has a great influence on the long-span bridge, and is an important factor in the design of the bridge. The existing research methods of wind-induced vibration of bridges mainly study the effect of wind on the bridge. Based on the Euler image amplification algorithm, this paper studies the effect of wind on the bridge by amplifying the experimental video with small changes. Based on the existing wind-induced vibration of bridges, the theoretical basis and related techniques of wind-induced vibration are systematically studied in this paper. By selecting appropriate video image decomposition and reconstruction techniques, wavelet and other time-domain analysis methods are used to selectively amplify the different details of the video. In order to achieve the best amplification effect, the filter range and magnification ratio of Euler image amplification algorithm (Eulerian Video Magnification) are adjusted. In this paper, a two-tower cable-stayed bridge segment model is tested in wind tunnel by two methods, the silk method and the smoke flow method. The video of smoke flow test at different angles of attack is selected as the magnifying object. The video calibration algorithm is used to stabilize the image, the wavelet transform is used to decompose and reconstruct the image, and some adjustable factors in the Euler image amplification algorithm are discussed. The filter frequency range and the optimal magnification for the wind-induced vibration of the bridge are determined.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3
本文编号：2304624
[Abstract]:The interaction between the bridge and the wind causes the wind-induced vibration of the bridge, which has a great influence on the long-span bridge, and is an important factor in the design of the bridge. The existing research methods of wind-induced vibration of bridges mainly study the effect of wind on the bridge. Based on the Euler image amplification algorithm, this paper studies the effect of wind on the bridge by amplifying the experimental video with small changes. Based on the existing wind-induced vibration of bridges, the theoretical basis and related techniques of wind-induced vibration are systematically studied in this paper. By selecting appropriate video image decomposition and reconstruction techniques, wavelet and other time-domain analysis methods are used to selectively amplify the different details of the video. In order to achieve the best amplification effect, the filter range and magnification ratio of Euler image amplification algorithm (Eulerian Video Magnification) are adjusted. In this paper, a two-tower cable-stayed bridge segment model is tested in wind tunnel by two methods, the silk method and the smoke flow method. The video of smoke flow test at different angles of attack is selected as the magnifying object. The video calibration algorithm is used to stabilize the image, the wavelet transform is used to decompose and reconstruct the image, and some adjustable factors in the Euler image amplification algorithm are discussed. The filter frequency range and the optimal magnification for the wind-induced vibration of the bridge are determined.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3
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，本文编号：2304624
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