畢業(yè)設(shè)計(jì)-金屬薄板的超聲蘭姆波無(wú)損檢測(cè)(已修改)
2024-12-19 18:14 本頁(yè)面
【正文】 金屬薄板的超聲蘭姆波無(wú)損檢測(cè) 學(xué)生姓名： 陳丹 班級(jí)： 0882021 指導(dǎo)老師： 陳振華 摘要： 隨著航天、航空、汽車工業(yè)的發(fā)展，各行業(yè)對(duì)金屬板材的需求量日益增多，發(fā)現(xiàn)一種更精確的金屬板蘭姆波無(wú)損檢測(cè)方法，顯得日益的重要。金屬板材構(gòu)件 ,尤其是金屬薄板 ,使用常規(guī)的超聲波探傷是很困難的， 與常規(guī)超聲波無(wú)損檢測(cè)相比，蘭姆波檢測(cè)具有快速高效的特點(diǎn)，非常適合于板形結(jié)構(gòu)的大面積無(wú)損檢測(cè)。盡管金屬薄板的無(wú)損檢測(cè)是蘭姆波技術(shù)的最早應(yīng)用領(lǐng)域，但是由于蘭姆波理論及檢測(cè)機(jī)理的復(fù)雜性，此項(xiàng)技術(shù) 至今仍未取得重大突破，還存在許多不一致的觀點(diǎn)和未解決的問(wèn)題，大大地限制了它在工業(yè)生產(chǎn)中的應(yīng)用。 本文主要介紹通過(guò)對(duì)鋁板模擬缺陷進(jìn)行實(shí)驗(yàn)，通過(guò)數(shù)字采樣得到各種缺陷下的時(shí)域信號(hào)，對(duì)比各模擬缺陷時(shí)域信號(hào)的不同特征參數(shù)，從而對(duì)鋁板中的模擬缺陷進(jìn)行無(wú)損檢測(cè)，并對(duì)一發(fā)一收缺陷波波形指數(shù)線性回歸跟自發(fā)自收端面回波波形指數(shù)線性回歸進(jìn)行對(duì)比，從而確定哪種研究方法更適合用于金屬薄板的無(wú)損檢測(cè)。 關(guān)鍵詞： 無(wú)損檢測(cè)； LAMB 波；金屬薄板 指導(dǎo)老師簽名： Thin metal sheet by ultrasonic Lamb wave nondestructive testing Student： Chendan Class： 0882021 Supervisor： Chenzhenhua Abstract： With the aerospace, aviation, the development of automobile industry, the industry of sheet metal on the increasing demand, find a more precise metal plate LAMB wave nondestructive detection method, is being more and more metal member, particularly the metal sheet, the use of conventional ultrasonic testing is difficult, and the routine ultrasonic nondestructive detection pared, LAMB wave detection with fast and efficient characteristics, is very suitable for the large area plate structure nondestructive the sheet metal nondestructive testing is the LAMB wave technology the earliest applications, but due to the LAMB wave theory and detection mechanism is plicated, this technology has not yet achieved a major breakthrough, there are still many points of disagreement and unresolved issues, greatly limits its application in industrial production. This paper mainly introduces the defects of aluminum simulation experiment, through the digital sampling of the various defects of the timedomain signal, paring the numerical simulation defect before and after time domain signals of different characteristic parameters, thereby the aluminum in the simulated defects, nondestructive testing, and the defects wave fitting linear regression were pared with surface echo, thereby to determine which method is more suitable for nondestructive detection for metal sheet. Key words:Nondestructive testing。LAMB wave。Metal Signature of supervisor： 目錄 1 緒論 ......................................................................................................................... 1 研究的背景和意義 ................................................................................... 1 金屬薄板 LAMB 波無(wú)損檢測(cè)概況及國(guó)內(nèi)外研究現(xiàn)狀分析 ........... 2 超聲波檢測(cè)信號(hào)的研究 .......................................................................... 3 超聲檢測(cè)的原理 .................................................................................. 3 超聲檢測(cè)的特點(diǎn) .................................................................................. 4 全文的主要工作內(nèi)容 .............................................................................. 4 2 LAMB 波理論及其無(wú)損檢測(cè)原理 ................................................................ 5 LAMB 波概述 ............................................................................................... 5 LAMB 波檢測(cè)原理 ..................................................................................... 6 3 LAMB 波無(wú)損檢測(cè)系統(tǒng)的組建 ..................................................................... 7 LAMB 波的激發(fā)與接收 ............................................................................ 7 LAMB 波無(wú)損檢測(cè)實(shí)驗(yàn)系統(tǒng) .............................................
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