本文選題：超聲Lamb波 + 經(jīng)典譜估計(jì)法�。� 參考：《數(shù)據(jù)采集與處理》2017年02期

【摘要】：超聲Lamb波在工業(yè)無損檢測與評價(jià)中具有廣闊的應(yīng)用前景。但受制于超聲導(dǎo)波多模式頻散與混疊的影響,如何實(shí)現(xiàn)高分辨率超聲導(dǎo)波的模式分離與頻散曲線提取,進(jìn)而定量分析材料的健康狀況一直是研究的熱點(diǎn)與難點(diǎn)。本文旨在將現(xiàn)代信號處理中廣泛采用的譜估計(jì)技術(shù)應(yīng)用于超聲Lamb波陣列信號分析,并通過提取頻散曲線定量測量板厚度。以經(jīng)典參數(shù)譜估計(jì)法中的Yule-Walker法與Burg法為例,實(shí)驗(yàn)測量和分析了3mm,4mm和5mm厚鋁板中的寬帶多模式Lamb波信號,準(zhǔn)確地提取了鋁板中的寬帶Lamb波頻散曲線,并比較了兩種經(jīng)典譜估計(jì)方法與二維傅氏變換法的性能,最終實(shí)現(xiàn)了鋁板厚度估計(jì)。
[Abstract]:Ultrasonic Lamb wave has a broad application prospect in industrial nondestructive testing and evaluation. However, due to the influence of multi-mode dispersion and aliasing of ultrasonic guided waves, how to realize the mode separation and dispersion curve extraction of high-resolution ultrasonic guided waves and to quantitatively analyze the health status of materials has always been a hot and difficult issue. In this paper, the widely used spectral estimation technique in modern signal processing is applied to the analysis of ultrasonic Lamb wave array signals, and the dispersion curve is extracted to quantitatively measure the thickness of the plate. Taking the Yule-Walker method and Burg method of classical parameter spectrum estimation as examples, the broadband multi-mode Lamb wave signals in 3mm 4mm and 5mm thick aluminum plates are measured and analyzed experimentally, and the dispersion curves of broadband Lamb waves in aluminum plates are accurately extracted. The performance of two classical spectrum estimation methods and two dimensional Fourier transform method are compared and the thickness estimation of aluminum plate is realized.
【作者單位】： 巴黎第六大學(xué)法國國家科學(xué)研究院國家衛(wèi)生與醫(yī)學(xué)研究院生物醫(yī)學(xué)成像實(shí)驗(yàn)室(LIB);復(fù)旦大學(xué)電子工程系;上海市醫(yī)學(xué)圖像處理與計(jì)算機(jī)輔助手術(shù)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金(11304043,11327405,11525416)資助項(xiàng)目
【分類號】：TG115.285

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