本文選題：超聲Lamb波 + 經典譜估計法��； 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)無損檢測與評價中具有廣闊的應用前景。但受制于超聲導波多模式頻散與混疊的影響,如何實現(xiàn)高分辨率超聲導波的模式分離與頻散曲線提取,進而定量分析材料的健康狀況一直是研究的熱點與難點。本文旨在將現(xiàn)代信號處理中廣泛采用的譜估計技術應用于超聲Lamb波陣列信號分析,并通過提取頻散曲線定量測量板厚度。以經典參數(shù)譜估計法中的Yule-Walker法與Burg法為例,實驗測量和分析了3mm,4mm和5mm厚鋁板中的寬帶多模式Lamb波信號,準確地提取了鋁板中的寬帶Lamb波頻散曲線,并比較了兩種經典譜估計方法與二維傅氏變換法的性能,最終實現(xiàn)了鋁板厚度估計。
[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】： 巴黎第六大學法國國家科學研究院國家衛(wèi)生與醫(yī)學研究院生物醫(yī)學成像實驗室(LIB);復旦大學電子工程系;上海市醫(yī)學圖像處理與計算機輔助手術重點實驗室;
【基金】：國家自然科學基金(11304043,11327405,11525416)資助項目
【分類號】：TG115.285

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