本文關鍵詞：近場強震記錄基線校正實驗系統(tǒng)研究　出處：《防災科技學院》2016年碩士論文　論文類型：學位論文

  更多相關文章： 強震動記錄 基線校正 非接觸式位移測量 動態(tài)視頻處理技術 永久位移振動臺實驗

【摘要】：近場強地震動觀測記錄因多種原因影響,一般會存在基線漂移問題,校正方法不當往往會產生與實際物理過程相悖的結論或有效地震動信息消失等問題,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,導致該問題一直還未很好的解決。本文針對這一問題在現(xiàn)有的研究基礎上開展了進一步的研究。本文對近場強震動記錄基線校正方法研究的發(fā)展歷程和現(xiàn)狀進行了總結,分析了基線漂移產生的原因,歸納了目前針對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題。為了對振動位移進行直接量測,本文基于動態(tài)視頻圖像處理技術,在MATLAB GUI平臺下開發(fā)了基于標識點自動識別的非接觸式動態(tài)位移測量系統(tǒng);并通過驗證試驗探討了該測量系統(tǒng)的測量精度,并進行了不同標識方案和攝像幀率對測試精度的影響分析,最終確定現(xiàn)有條件下用于振動位移直接測量的優(yōu)化參數(shù)測試方案。最后,根據近場強震動觀測實際情況,提出一種新的振動臺實驗方案用于開展強震動觀測加速度計旋轉、傾斜和發(fā)生永久位移情況下的數(shù)據可靠性的正演式實驗分析。實驗分析表明:在一維平動加載情況下,旋轉一定水平轉角測得強地震動與正確安裝加速度測得的加載方向記錄差別可通過數(shù)學理論較好的校正過來,傾斜一定角度測得強地震動與正確安裝加速度測得的加載方向記錄差別也可通過數(shù)學理論較好的校正過來;在一維平動加載情況下,強震動加速度記錄通過積分校正后得到的永久位移值和位移過程與真實的永久位移值和位移過程可以做到基本符合。最后本文指出后續(xù)相關研究的方向和思路。
[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.
【學位授予單位】：防災科技學院
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：P315.7

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