本文選題：環(huán)境激勵(lì) + 模態(tài)參數(shù)識別　； 參考：《振動與沖擊》2014年01期

【摘要】：結(jié)合隨機(jī)子空間法(SSI)提出了環(huán)境激勵(lì)下結(jié)構(gòu)模態(tài)參數(shù)識別的改進(jìn)ITD法。隨機(jī)子空間法的識別精度高,其中數(shù)據(jù)的協(xié)方差計(jì)算可以保留原始數(shù)據(jù)中的所有信息,同時(shí)去除了噪聲,得到的Toeplitz矩陣中的數(shù)據(jù)可以作為ITD法的輸入數(shù)據(jù),這樣ITD法不再需要采用隨機(jī)減量法或者自然激勵(lì)技術(shù)(NExT法)進(jìn)行前處理,從而避免了這兩種前處理方法的不準(zhǔn)確性帶來的誤差。通過環(huán)境振動下四層鋼框架模型試驗(yàn)的位移響應(yīng),對提出的改進(jìn)ITD法進(jìn)行了驗(yàn)證。與ITD法相比,改進(jìn)的ITD法明顯提高了對頻率和阻尼比等結(jié)構(gòu)模態(tài)參數(shù)的識別精度,表明改進(jìn)ITD法可應(yīng)用于結(jié)構(gòu)的模態(tài)參數(shù)識別;與SSI法相比,改進(jìn)ITD法精度沒有降低,同時(shí)縮短了計(jì)算時(shí)間,這將為該方法應(yīng)用到結(jié)構(gòu)的實(shí)時(shí)監(jiān)測提供了可能。
[Abstract]:Combined with random subspace method (SSI), an improved ITD method for structural modal parameter identification under ambient excitation is proposed. The random subspace method has high recognition accuracy, in which the covariance calculation of the data can retain all the information in the original data, and at the same time the noise is removed. The obtained data in the Toeplitz matrix can be used as the input data of the ITD method. In this way, the ITD method does not need to adopt the random reduction method or the natural excitation technique (NExT method) to carry on the pre-processing, thus avoids the error caused by the inaccuracy of these two pre-processing methods. The improved ITD method is verified by the displacement response of the four-story steel frame model test under ambient vibration. Compared with the ITD method, the improved ITD method obviously improves the accuracy of structural modal parameters, such as frequency and damping ratio, which indicates that the improved ITD method can be used to identify the modal parameters of the structure, and the improved ITD method has no lower precision than the SSI method. At the same time, the computation time is shortened, which makes it possible for the method to be applied to the real time monitoring of the structure.
【作者單位】： 重慶大學(xué)山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室;重慶大學(xué)土木工程學(xué)院;
【基金】：重慶市建設(shè)科技計(jì)劃項(xiàng)目(2012-2-49,2011-2-86)
【分類號】：TU317

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 任偉新;環(huán)境振動系統(tǒng)識別方法的比較分析[J];福州大學(xué)學(xué)報(bào)(自然科學(xué)版);2001年06期

2 徐良,江見鯨,過靜s，

本文編號：1839483