【摘要】：由于受激勵未知、測量噪聲及建模誤差等因素影響,基于振動的結(jié)構(gòu)損傷識別結(jié)果存在明顯不確定性。為此,利用振動傳遞率函數(shù)和統(tǒng)計假設(shè)檢驗進(jìn)行結(jié)構(gòu)損傷識別研究。用結(jié)構(gòu)損傷前后加速度響應(yīng)計算振動傳遞率函數(shù);用主成分分析(Principal Component Analysis,PCA)提取結(jié)構(gòu)損傷前后振動傳遞率函數(shù)的第一階主成分作為正態(tài)總體樣本;用多元統(tǒng)計分析中F檢驗法進(jìn)行假設(shè)檢驗分析以達(dá)損傷識別目的。該方法無需激勵信息,具有一定抗噪聲能力,適合處理激勵未知、測量噪聲等因素引起的不確定性問題。通過海洋平臺結(jié)構(gòu)數(shù)值模擬及振動臺模型試驗驗證該方法的可行性。
[Abstract]:Due to the influence of unknown excitation, measurement noise and modeling error, the results of structural damage identification based on vibration have obvious uncertainty. Therefore, structural damage identification is studied by using vibration transfer rate function and statistical hypothesis test. The vibration transfer rate function is calculated by the acceleration response before and after the damage, the first order principal component of the vibration transfer rate function before and after the damage is extracted by principal component analysis (Principal Component Analysis,PCA) as the normal population sample. In order to achieve the purpose of damage identification, the F test method is used to analyze the hypothesis in multivariate statistical analysis. This method does not need the excitation information and has the ability to resist noise. It is suitable for dealing with the uncertainty caused by unknown excitation and measurement noise. The feasibility of the method is verified by numerical simulation of offshore platform structure and shaking table model test.
【作者單位】： 青島理工大學(xué)土工程學(xué)院;山東省藍(lán)色經(jīng)濟區(qū)工程建設(shè)與安全協(xié)同創(chuàng)新中心;
【基金】：國家自然科學(xué)基金(51179082) 山東省藍(lán)色經(jīng)濟區(qū)工程建設(shè)與安全協(xié)同創(chuàng)新中心
【分類號】：TU317

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