本文選題：頻響函數(shù) + 模式置信準(zhǔn)則��； 參考：《北京交通大學(xué)》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(shí)別方法的優(yōu)點(diǎn)和局限性,論述了頻響函數(shù)在實(shí)際測(cè)試中的優(yōu)點(diǎn),提出了一種基于頻響函數(shù)模式置信準(zhǔn)則的橋梁損傷動(dòng)力識(shí)別方法,通過(guò)數(shù)值分析提出了該方法的計(jì)算準(zhǔn)則,并利用數(shù)值模型驗(yàn)證該方法的可行性。在此基礎(chǔ)上研究了損傷測(cè)點(diǎn)優(yōu)化布置方案,分別通過(guò)模型試驗(yàn)和現(xiàn)場(chǎng)試驗(yàn)驗(yàn)證了該方法識(shí)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(zhǔn)則的橋梁損傷動(dòng)力識(shí)別方法。在模型修正基礎(chǔ)上,將相鄰測(cè)點(diǎn)頻響函數(shù)模式置信準(zhǔn)則作為新的目標(biāo)函數(shù)。同時(shí)闡述了該方法的基本理論和計(jì)算流程。 (2)通過(guò)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(guò)數(shù)值算例,驗(yàn)證了基于頻響函數(shù)模式置信準(zhǔn)則損傷識(shí)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(zhǔn)則損傷識(shí)別方法基礎(chǔ)上,研究了分布式和分站式兩種損傷識(shí)別測(cè)點(diǎn)優(yōu)化布置方案。 (5)利用分步式測(cè)點(diǎn)優(yōu)化布置,對(duì)模型梁進(jìn)行沖擊振動(dòng)實(shí)驗(yàn),驗(yàn)證了頻響函數(shù)模式置信準(zhǔn)則損傷識(shí)別方法的可行性。 (6)利用分站式測(cè)點(diǎn)優(yōu)化布置,對(duì)鋼筋混凝土簡(jiǎn)支梁進(jìn)行現(xiàn)場(chǎng)損傷沖擊振動(dòng)試驗(yàn),驗(yàn)證了頻響函數(shù)模式置信準(zhǔn)則損傷識(shí)別方法的實(shí)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(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U446

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本文編號(hào)：2030348