本文關(guān)鍵詞： 管結(jié)構(gòu) 導(dǎo)波 疊前逆時(shí)偏移 損傷識(shí)別　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：在現(xiàn)代工業(yè)中管道結(jié)構(gòu)發(fā)揮著不可替代的作用,管結(jié)構(gòu)的損傷與破壞會(huì)導(dǎo)致嚴(yán)重的工程事故及重大經(jīng)濟(jì)損失,因此對(duì)管道結(jié)構(gòu)進(jìn)行健康監(jiān)測(cè)與損傷識(shí)別十分必要。在諸多無(wú)損檢測(cè)方法中,基于超聲導(dǎo)波的無(wú)損檢測(cè)方法由于其快捷、造價(jià)低且適應(yīng)大范圍檢測(cè)等優(yōu)點(diǎn)而受到廣泛關(guān)注。本文針對(duì)金屬圓管中的裂縫損傷,采用基于導(dǎo)波理論和疊前逆時(shí)偏移的方法對(duì)其進(jìn)行損傷成像。本文中首先給出了各向同性空心圓管中導(dǎo)波的頻散特征方程,對(duì)三種沿軸向傳播的導(dǎo)波模態(tài)的基本傳播特性進(jìn)行了分析,并根據(jù)簡(jiǎn)正模態(tài)展開(kāi)法探討了在局部非軸對(duì)稱荷載激勵(lì)下導(dǎo)波的幅值大小及位移場(chǎng)分布;其次,介紹了疊前逆時(shí)偏移方法的基本原理,對(duì)扭轉(zhuǎn)波在各向同性金屬管中的波動(dòng)進(jìn)行了建模。最后,試驗(yàn)研究了d31型和d36型兩種壓電晶片環(huán)形陣列對(duì)圓管上裂縫損傷的檢測(cè),應(yīng)用數(shù)值模擬技術(shù)實(shí)現(xiàn)了波場(chǎng)的逆時(shí)偏移過(guò)程,然后采用激勵(lì)-時(shí)間成像條件提取了損傷的成像結(jié)果,將成像結(jié)果與損傷的實(shí)際狀態(tài)進(jìn)行了對(duì)比,并分別分析了縱向模態(tài)和扭轉(zhuǎn)模態(tài)對(duì)裂縫損傷的檢測(cè)能力。研究表明,采用疊前逆時(shí)偏移的方法,根據(jù)圓管外表面上環(huán)形分布的傳感系統(tǒng)所采集到的反射信號(hào),能夠成功的對(duì)圓管上的缺陷進(jìn)行成像,試驗(yàn)驗(yàn)證了該方法對(duì)圓管上的裂縫進(jìn)行成像的有效性和可應(yīng)用性。
[Abstract]:Pipeline structure plays an irreplaceable role in modern industry. The damage and destruction of pipe structure will lead to serious engineering accidents and major economic losses. Therefore, it is necessary to carry out health monitoring and damage identification for pipeline structures. Among the many nondestructive testing methods, the ultrasonic guided wave based nondestructive testing method is very fast. The advantages of low cost and suitable for large-scale detection have attracted wide attention. In this paper, the crack damage in metallic circular pipes is studied. Based on the theory of guided wave and the method of prestack inverse time migration, the damage imaging is carried out. In this paper, the dispersion characteristic equation of guided wave in an isotropic hollow tube is first given. The basic propagation characteristics of three kinds of guided wave modes propagating along axial direction are analyzed, and the amplitude and displacement distribution of guided waves under the excitation of local non-axisymmetric loads are discussed according to the normal mode expansion method. The basic principle of prestack inverse time migration method is introduced, and the wave of torsional wave in isotropic metal tube is modeled. Finally, two kinds of piezoelectric wafer ring arrays, d31 and d36, are experimentally studied to detect the crack damage on a circular tube. The inverse time migration process of the wave field is realized by numerical simulation technique. Then the damage imaging results are extracted by using the excitation-time imaging condition, and the imaging results are compared with the actual state of the damage. The ability of longitudinal mode and torsional mode to detect crack damage is analyzed respectively. The results show that the method of prestack inverse time migration is used to measure the reflected signals collected by the annular sensor system on the outer surface of the pipe. The defect on the circular pipe can be successfully imaged, and the experimental results show that the method is effective and applicable to the cracks on the pipe.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U178

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 張曉丹;柯熙政;張志禹;;疊前深度逆時(shí)偏移成像的并行算法研究[J];計(jì)算機(jī)工程;2011年19期

2 董良國(guó);彈性波數(shù)值模擬中的吸收邊界條件[J];石油地球物理勘探;1999年01期

3 宋生奎,宮敬,才建,胡利明;油氣管道內(nèi)檢測(cè)技術(shù)研究進(jìn)展[J];石油工程建設(shè);2005年02期

4 陳可洋;;基于高階有限差分的波動(dòng)方程疊前逆時(shí)偏移方法[J];石油物探;2009年05期

5 劉鎮(zhèn)清;圓管中的超聲導(dǎo)波[J];無(wú)損檢測(cè);1999年12期

相關(guān)碩士學(xué)位論文 前1條

1 陳聰;疊前逆時(shí)偏移及成像[D];中國(guó)地質(zhì)大學(xué)（北京）;2011年

，

本文編號(hào)：1508325