本文選題：頻響函數(shù) + 模式置信準則��； 參考：《北京交通大學》2014年碩士論文

【摘要】：本文闡述了基于模態(tài)參數(shù)模型修正理論損傷識別方法的優(yōu)點和局限性,論述了頻響函數(shù)在實際測試中的優(yōu)點,提出了一種基于頻響函數(shù)模式置信準則的橋梁損傷動力識別方法,通過數(shù)值分析提出了該方法的計算準則,并利用數(shù)值模型驗證該方法的可行性。在此基礎(chǔ)上研究了損傷測點優(yōu)化布置方案,分別通過模型試驗和現(xiàn)場試驗驗證了該方法識別損傷的可靠性。本文的主要工作及結(jié)論如下： (1)提出了基于頻響函數(shù)模式置信準則的橋梁損傷動力識別方法。在模型修正基礎(chǔ)上,將相鄰測點頻響函數(shù)模式置信準則作為新的目標函數(shù)。同時闡述了該方法的基本理論和計算流程。 (2)通過數(shù)值分析,確定將傳遞函數(shù)中第一階峰值和第二階峰值間的平直頻率段段選取為分析頻率段。 (3)通過數(shù)值算例,驗證了基于頻響函數(shù)模式置信準則損傷識別方法的可行性和頻率段選取原則的正確性。 (4)在頻響函數(shù)模式置信準則損傷識別方法基礎(chǔ)上,研究了分布式和分站式兩種損傷識別測點優(yōu)化布置方案。 (5)利用分步式測點優(yōu)化布置,對模型梁進行沖擊振動實驗,驗證了頻響函數(shù)模式置信準則損傷識別方法的可行性。 (6)利用分站式測點優(yōu)化布置,對鋼筋混凝土簡支梁進行現(xiàn)場損傷沖擊振動試驗,驗證了頻響函數(shù)模式置信準則損傷識別方法的實用性。
[Abstract]:In this paper, the advantages and limitations of damage identification method based on modal parameter model correction theory are described. The advantages of frequency response function (FRF) in practical testing are discussed, and a bridge damage dynamic identification method based on FRF mode confidence criterion is proposed. The computational criteria of the method are presented by numerical analysis, and the feasibility of the method is verified by numerical model. On this basis, the optimal layout of damage detection points is studied, and the reliability of the method is verified by model test and field test. The main work and conclusions of this paper are as follows: (1) A bridge damage dynamic identification method based on the confidence criterion of frequency response function (FRF) is proposed. On the basis of model modification, the confidence criterion of frequency response function (FRF) of adjacent measurement points is taken as a new objective function. At the same time, the basic theory and calculation flow of the method are described. It is determined that the straight frequency segment between the first and second order peaks in the transfer function is selected as the analytical frequency segment. The feasibility of the damage identification method based on the frequency response function pattern confidence criterion and the correctness of the principle of frequency band selection are verified. (4) on the basis of the frequency response function pattern confidence criterion damage identification method, In this paper, two kinds of optimal layout schemes of damage detection points of distributed and sub-station types are studied. The impact vibration experiments of the model beams are carried out by using the split step method to optimize the layout of measuring points. The feasibility of the damage identification method based on the confidence criterion of frequency response function (FRF) is verified. The practicability of the damage detection method based on the confidence criterion of frequency response function (FRF) is verified.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U446

【參考文獻】

相關(guān)期刊論文 前6條

1 郭健;孫炳楠;;橋梁健康監(jiān)測中的關(guān)鍵性問題和損傷識別方法[J];公路;2006年04期

2 鄭棟梁,李中付,華宏星;結(jié)構(gòu)早期損傷識別技術(shù)的現(xiàn)狀和發(fā)展趨勢[J];振動與沖擊;2002年02期

3 劉文峰,柳春圖,應懷樵;通過頻率改變率進行損傷定位的方法研究[J];振動與沖擊;2004年02期

4 高維成,劉偉,鄒經(jīng)湘;基于結(jié)構(gòu)振動參數(shù)變化的損傷探測方法綜述[J];振動與沖擊;2004年04期

5 王術(shù)新,姜哲;基于結(jié)構(gòu)振動損傷識別技術(shù)的研究現(xiàn)狀及進展[J];振動與沖擊;2004年04期

6 秦權(quán);橋梁結(jié)構(gòu)的健康監(jiān)測[J];中國公路學報;2000年02期

，

本文編號：2030348