【摘要】：橋梁與風(fēng)之間的相互作用引發(fā)了橋梁的風(fēng)致振動(dòng),對(duì)大跨度橋梁產(chǎn)生了巨大的影響,是橋梁設(shè)計(jì)的重要考慮因素。現(xiàn)有的橋梁風(fēng)致振動(dòng)研究方法主要研究了風(fēng)對(duì)橋梁的作用,本文基于的歐拉影像放大算法,通過(guò)對(duì)試驗(yàn)視頻進(jìn)行微小變化放大來(lái)研究對(duì)橋梁對(duì)風(fēng)的作用。從現(xiàn)有的橋梁風(fēng)致振動(dòng)問(wèn)題出發(fā),本文系統(tǒng)地研究了風(fēng)致振動(dòng)的理論基礎(chǔ)及相關(guān)技術(shù),采集風(fēng)洞中橋梁節(jié)段模型在一定風(fēng)環(huán)境下風(fēng)洞試驗(yàn)中的流跡顯示視頻并進(jìn)行穩(wěn)像處理,通過(guò)選擇合適的視頻圖像分解和重構(gòu)技術(shù),采用小波等時(shí)域分析方法針對(duì)視頻中的不同變化細(xì)節(jié)進(jìn)行選擇性放大處理,并通過(guò)調(diào)整歐拉影像放大算法(Eulerian Video Magnification)中濾波范圍和放大倍數(shù)等參數(shù),以達(dá)到最佳的放大效果。本文在風(fēng)洞中對(duì)某雙塔斜拉橋的節(jié)段模型進(jìn)行了絲線法和煙流法兩種方法的流跡顯示試驗(yàn),選取在不同風(fēng)攻角下的煙流法試驗(yàn)視頻作為放大對(duì)象,通過(guò)視頻校準(zhǔn)算法進(jìn)行了穩(wěn)像處理,采用基于小波變換的方法進(jìn)行圖像分解和重構(gòu),對(duì)歐拉影像放大算法中的一些可調(diào)因素進(jìn)行討論,確定了針對(duì)該橋風(fēng)致振動(dòng)問(wèn)題的濾波頻率范圍和最佳放大倍數(shù)。
[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.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441.3

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本文編號(hào)：2304624