本文選題：無(wú)損檢測(cè) + 脈沖渦流��； 參考：《浙江大學(xué)》2015年碩士論文

【摘要】：多層導(dǎo)電結(jié)構(gòu)在國(guó)民經(jīng)濟(jì)中應(yīng)用廣泛,并且隨著重要裝備安全監(jiān)測(cè)與保障要求不斷提高,提高其無(wú)損檢測(cè)系統(tǒng)的可靠性變得至關(guān)重要。脈沖渦流檢測(cè)技術(shù)是一種較新的電磁無(wú)損檢測(cè)技術(shù),對(duì)多層結(jié)構(gòu)的檢測(cè)有很好的效果。本文結(jié)合國(guó)家自然科學(xué)基金項(xiàng)目,圍繞多層導(dǎo)電結(jié)構(gòu)內(nèi)層缺陷的在線檢測(cè)、脈沖渦流瞬態(tài)響應(yīng)信號(hào)的處理、脈沖渦流掃描成像技術(shù)以及原型系統(tǒng)的研發(fā)進(jìn)行了理論與實(shí)驗(yàn)的研究,增強(qiáng)了對(duì)多層結(jié)構(gòu)內(nèi)層缺陷的檢測(cè)能力。本文的主要工作和創(chuàng)新點(diǎn)如下：1)研究了脈沖渦流檢測(cè)方法的基本原理,利用建立檢測(cè)系統(tǒng)的電路模型,推導(dǎo)了脈沖渦流時(shí)域響應(yīng)信號(hào)的表達(dá)式,并進(jìn)行了有限元仿真的研究,闡述分析了脈沖渦流檢測(cè)系統(tǒng)的可行性,為檢測(cè)系統(tǒng)開(kāi)發(fā)奠定了理論依據(jù)。2)在現(xiàn)有的脈沖渦流信號(hào)分析研究的基礎(chǔ)上,提出一種基于Fisher線性判別的缺陷自動(dòng)參數(shù)識(shí)別的方法。通過(guò)Fisher線性判別對(duì)脈沖渦流的瞬態(tài)響應(yīng)信號(hào)進(jìn)行特征提取,然后利用支持向量機(jī)算法,進(jìn)行自動(dòng)缺陷定位與缺陷類型識(shí)別,提高缺陷參數(shù)識(shí)別的可靠性。3)采用脈沖渦流掃描成像技術(shù),提出了一種基于Canny算子的缺陷邊緣檢測(cè)方法。在得到脈沖渦流掃描成像圖后,采用所提出的方法,提取出圖像的邊緣,根據(jù)邊緣信息對(duì)缺陷的位置等信息進(jìn)行定量化的評(píng)估。并結(jié)合第2點(diǎn)中提出的缺陷自動(dòng)參數(shù)識(shí)別方法,提出了一種缺陷在線自動(dòng)評(píng)估方法。4)針對(duì)多層導(dǎo)電結(jié)構(gòu),在脈沖渦流檢測(cè)機(jī)理的基礎(chǔ)上,設(shè)計(jì)了脈沖渦流C掃描檢測(cè)原型系統(tǒng),對(duì)硬件和軟件設(shè)計(jì)進(jìn)行了改進(jìn)。綜合實(shí)驗(yàn)結(jié)果表明,應(yīng)用脈沖渦流檢測(cè)方法,可實(shí)現(xiàn)多層導(dǎo)電結(jié)構(gòu)缺陷的識(shí)別與評(píng)估,增強(qiáng)了檢測(cè)系統(tǒng)的可靠性,為重要裝備的無(wú)損檢測(cè)與評(píng)估提供了技術(shù)支持。
[Abstract]:Multilayer conductive structures are widely used in the national economy, and with the increasing requirements of safety monitoring and support for important equipment, it is very important to improve the reliability of the NDT system. Pulsed eddy current testing is a new electromagnetic nondestructive testing technique, which has good effect on multilayer structure detection. Based on the project of National Natural Science Foundation of China, this paper focuses on the on-line detection of inner layer defects of multi-layer conductive structures and the processing of transient response signals of pulse eddy current. The research and development of pulsed eddy current scanning imaging technology and prototype system are carried out in theory and experiment to enhance the detection ability of the inner layer defects of multi-layer structure. The main work and innovation of this paper are as follows: (1) the basic principle of pulsed eddy current detection method is studied, and the expression of time domain response signal of pulse eddy current is deduced by using the circuit model of the detection system, and the finite element simulation is carried out. The feasibility of the pulsed eddy current detection system is analyzed. The theoretical basis for the development of the detection system is established. On the basis of the analysis and research of the existing pulse eddy current signal, a method of automatic defect parameter identification based on Fisher linear discrimination is proposed. The transient response signal of pulse eddy current is extracted by Fisher linear discriminant, then automatic defect location and defect type identification are carried out by using support vector machine (SVM) algorithm. In order to improve the reliability of defect parameter identification, a defect edge detection method based on Canny operator is proposed. After obtaining the image of pulse eddy current scanning, the edge of the image is extracted by the proposed method, and the position of the defect is quantitatively evaluated according to the edge information. Combined with the defect automatic parameter identification method proposed in the second point, a defect on-line automatic evaluation method .4) aiming at the multi-layer conductive structure, based on the mechanism of pulse eddy current detection, the prototype system of pulse eddy current C scan detection is designed. The hardware and software design are improved. The comprehensive experimental results show that the application of pulsed eddy current detection method can realize the identification and evaluation of defects of multi-layer conductive structures, enhance the reliability of the detection system, and provide technical support for nondestructive testing and evaluation of important equipment.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB302.5

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本文編號(hào)：1793654