本文關(guān)鍵詞：近場(chǎng)強(qiáng)震記錄基線校正實(shí)驗(yàn)系統(tǒng)研究　出處：《防災(zāi)科技學(xué)院》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 強(qiáng)震動(dòng)記錄 基線校正 非接觸式位移測(cè)量 動(dòng)態(tài)視頻處理技術(shù) 永久位移振動(dòng)臺(tái)實(shí)驗(yàn)

【摘要】：近場(chǎng)強(qiáng)地震動(dòng)觀測(cè)記錄因多種原因影響,一般會(huì)存在基線漂移問(wèn)題,校正方法不當(dāng)往往會(huì)產(chǎn)生與實(shí)際物理過(guò)程相悖的結(jié)論或有效地震動(dòng)信息消失等問(wèn)題,現(xiàn)有研究成果雖然提出一系列的校正方法,但因方法存在較大的主觀性和不確定性,導(dǎo)致該問(wèn)題一直還未很好的解決。本文針對(duì)這一問(wèn)題在現(xiàn)有的研究基礎(chǔ)上開(kāi)展了進(jìn)一步的研究。本文對(duì)近場(chǎng)強(qiáng)震動(dòng)記錄基線校正方法研究的發(fā)展歷程和現(xiàn)狀進(jìn)行了總結(jié),分析了基線漂移產(chǎn)生的原因,歸納了目前針對(duì)基線漂移提出的基線校正方法,并指出了現(xiàn)有的基線校正方法中存在的問(wèn)題。為了對(duì)振動(dòng)位移進(jìn)行直接量測(cè),本文基于動(dòng)態(tài)視頻圖像處理技術(shù),在MATLAB GUI平臺(tái)下開(kāi)發(fā)了基于標(biāo)識(shí)點(diǎn)自動(dòng)識(shí)別的非接觸式動(dòng)態(tài)位移測(cè)量系統(tǒng);并通過(guò)驗(yàn)證試驗(yàn)探討了該測(cè)量系統(tǒng)的測(cè)量精度,并進(jìn)行了不同標(biāo)識(shí)方案和攝像幀率對(duì)測(cè)試精度的影響分析,最終確定現(xiàn)有條件下用于振動(dòng)位移直接測(cè)量的優(yōu)化參數(shù)測(cè)試方案。最后,根據(jù)近場(chǎng)強(qiáng)震動(dòng)觀測(cè)實(shí)際情況,提出一種新的振動(dòng)臺(tái)實(shí)驗(yàn)方案用于開(kāi)展強(qiáng)震動(dòng)觀測(cè)加速度計(jì)旋轉(zhuǎn)、傾斜和發(fā)生永久位移情況下的數(shù)據(jù)可靠性的正演式實(shí)驗(yàn)分析。實(shí)驗(yàn)分析表明:在一維平動(dòng)加載情況下,旋轉(zhuǎn)一定水平轉(zhuǎn)角測(cè)得強(qiáng)地震動(dòng)與正確安裝加速度測(cè)得的加載方向記錄差別可通過(guò)數(shù)學(xué)理論較好的校正過(guò)來(lái),傾斜一定角度測(cè)得強(qiáng)地震動(dòng)與正確安裝加速度測(cè)得的加載方向記錄差別也可通過(guò)數(shù)學(xué)理論較好的校正過(guò)來(lái);在一維平動(dòng)加載情況下,強(qiáng)震動(dòng)加速度記錄通過(guò)積分校正后得到的永久位移值和位移過(guò)程與真實(shí)的永久位移值和位移過(guò)程可以做到基本符合。最后本文指出后續(xù)相關(guān)研究的方向和思路。
[Abstract]:The near field strong ground motion observation records usually have the problem of baseline drift due to many reasons. Improper correction methods often produce conclusions contrary to the actual physical process or the disappearance of effective ground motion information and so on. Although a series of correction methods have been proposed in the present research results, there is a great deal of subjectivity and uncertainty in the methods. As a result, the problem has not been solved well. This paper has carried out further research on this problem on the basis of existing research. This paper has carried out the development and present situation of baseline correction methods for near-field intensity seismic records. Summarized. The causes of baseline drift are analyzed, the current baseline correction methods for baseline drift are summarized, and the problems existing in the existing baseline correction methods are pointed out in order to measure vibration displacement directly. Based on dynamic video image processing technology, a non-contact dynamic displacement measurement system based on automatic identification of identification points is developed in MATLAB GUI platform. The accuracy of the measurement system is discussed through the verification test, and the influence of different marking schemes and frame rate on the measurement accuracy is analyzed. Finally, the optimal parameter measurement scheme for direct vibration displacement measurement under existing conditions is determined. Finally, according to the actual situation of near-field intensity vibration observation. A new shaking table experimental scheme is proposed for the rotation of accelerometers with strong vibration observation. The forward experimental analysis of the reliability of the data in the case of tilt and permanent displacement. The experimental results show that: in the case of one-dimensional translational loading. The difference between the strong ground motion measured by rotating a certain horizontal rotation angle and the loading direction record measured by correct installation acceleration can be well corrected by mathematical theory. The difference between the strong ground motion measured at a certain angle of tilt and the loading direction record measured by the correct installation acceleration can also be corrected by mathematical theory. In the case of one-dimensional translational loading. The permanent displacement value and displacement process obtained by the integral correction of the strong vibration acceleration record can be basically consistent with the real permanent displacement value and displacement process. Finally, this paper points out the direction and ideas of the subsequent research.
【學(xué)位授予單位】：防災(zāi)科技學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：P315.7

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