發(fā)布時(shí)間：2018-06-15 23:07

  本文選題：Lamb波 + 結(jié)構(gòu)健康監(jiān)測(cè)��； 參考：《南京航空航天大學(xué)》2017年碩士論文

【摘要】：基于Lamb波的結(jié)構(gòu)健康監(jiān)測(cè)技術(shù)能夠在線實(shí)時(shí)地檢測(cè)結(jié)構(gòu)中的微小損傷,極大地維護(hù)了結(jié)構(gòu)的安全性。本文利用傳統(tǒng)壓電元件和含金屬芯壓電纖維(MPF),深入研究了基于Lamb波的主動(dòng)健康監(jiān)測(cè)技術(shù)。首先,介紹了Lamb波的基本理論及其傳播特性。分析了Lamb波的激勵(lì)方法,對(duì)激勵(lì)信號(hào)的參數(shù)進(jìn)行了分析和選擇。實(shí)現(xiàn)了軟硬件的交互。其次,研究了層析法的原理,定義了不相關(guān)系數(shù),并提出了損傷定位概率成像方法。根據(jù)結(jié)構(gòu)健康監(jiān)測(cè)系統(tǒng)的工作原理,搭建了實(shí)驗(yàn)平臺(tái),設(shè)計(jì)了損傷監(jiān)測(cè)程序。計(jì)算了監(jiān)測(cè)區(qū)域的空間分辨率,并分析了單損傷和多損傷的定位。再次,分析了針對(duì)不同檢測(cè)原理的定位方法,并計(jì)算了空間分辨率與損傷識(shí)別之間的關(guān)系。研究了不相關(guān)系數(shù)與腐蝕程度的關(guān)系,判斷了損傷的存在性,提出了腐蝕程度的識(shí)別方法。分析了橢圓因子對(duì)損傷定位結(jié)果的影響,并對(duì)腐蝕損傷和模擬損傷進(jìn)行了定位。最后,針對(duì)傳統(tǒng)方法需要Lamb波傳播速度進(jìn)行損傷定位的缺點(diǎn),利用MPF花形傳感器對(duì)Lamb波傳感的方向性,提出了一種無需Lamb波波速信息的損傷定位方法。理論分析了MPF花形傳感器的響應(yīng)特性,通過沖擊標(biāo)定方法得到了花形傳感器的電壓響應(yīng)幅值與Lamb波傳播方向之間精確的函數(shù)關(guān)系。定義了一種損傷指標(biāo),并提出了基于角度識(shí)別的損傷定位方法,評(píng)估了監(jiān)控區(qū)域的角度分辨率。實(shí)驗(yàn)結(jié)果表明,利用壓電線陣和MPF花形傳感器可以精確地對(duì)損傷進(jìn)行定位成像。
[Abstract]:The structure health monitoring technology based on Lamb wave can detect the small damage in the structure in real time on line, which greatly maintains the safety of the structure. In this paper, the active health monitoring technology based on Lamb wave is studied by using traditional piezoelectric element and piezoelectric fiber with metal core. Firstly, the basic theory and propagation characteristics of Lamb wave are introduced. The excitation method of Lamb wave is analyzed and the parameters of excitation signal are analyzed and selected. The interaction of hardware and software is realized. Secondly, the principle of tomographic method is studied, the uncorrelated coefficient is defined, and the probabilistic imaging method of damage location is proposed. According to the working principle of the structural health monitoring system, the experimental platform was built and the damage monitoring program was designed. The spatial resolution of the monitoring area is calculated, and the location of single damage and multiple damage is analyzed. Thirdly, the location methods based on different detection principles are analyzed, and the relationship between spatial resolution and damage identification is calculated. The relationship between non-correlation coefficient and corrosion degree was studied, the existence of damage was judged, and the method of corrosion degree identification was put forward. The influence of ellipse factor on the damage location results is analyzed, and the corrosion damage and simulated damage are located. Finally, aiming at the disadvantage of the traditional method which requires the propagation velocity of Lamb wave to locate the damage, a damage localization method is proposed by using MPF flower sensor to the direction of Lamb wave sensor without the information of Lamb wave velocity. The response characteristics of MPF flower sensor are analyzed theoretically. The accurate functional relationship between the amplitude of voltage response and the propagation direction of Lamb wave is obtained by means of impulse calibration method. A damage index is defined and a damage location method based on angle recognition is proposed to evaluate the angular resolution of the monitoring area. The experimental results show that the damage location imaging can be carried out accurately by using the compression wire array and MPF flower sensor.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP212;TP274

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 杜紅兵;張慶慶;;民航飛行事故統(tǒng)計(jì)及原因分析[J];工業(yè)安全與環(huán)保;2016年08期

2 付尚琛;石立華;馬丁;蔡建;;基于彎折頻率變換的Lamb波高分辨率損傷成像[J];振動(dòng)與沖擊;2014年01期

3 彭鴿,袁慎芳;復(fù)合材料結(jié)構(gòu)損傷的小波神經(jīng)網(wǎng)絡(luò)辨識(shí)研究[J];宇航學(xué)報(bào);2005年05期

相關(guān)會(huì)議論文 前1條

1 王明;李庶林;;聲發(fā)射技術(shù)在結(jié)構(gòu)安全監(jiān)測(cè)中的研究與應(yīng)用概述[A];第六屆全國(guó)工程結(jié)構(gòu)安全防護(hù)學(xué)術(shù)會(huì)議論文集[C];2007年

相關(guān)博士學(xué)位論文 前5條

1 羅俊;含金屬芯壓電纖維的制備、表征及其力學(xué)問題研究[D];南京航空航天大學(xué);2014年

2 王瑜;基于空間濾波器的結(jié)構(gòu)健康監(jiān)測(cè)研究[D];南京航空航天大學(xué);2012年

3 苗曉婷;基于導(dǎo)波的結(jié)構(gòu)健康監(jiān)測(cè)中特征提取技術(shù)與損傷識(shí)別方法的研究[D];上海交通大學(xué);2011年

4 劉建;基于含金屬芯壓電纖維與Lamb波的結(jié)構(gòu)健康監(jiān)測(cè)技術(shù)研究[D];南京航空航天大學(xué);2010年

5 邊義祥;含金屬芯壓電纖維的驅(qū)動(dòng)和傳感特性研究[D];南京航空航天大學(xué);2009年

相關(guān)碩士學(xué)位論文 前3條

1 單勝博;基于超聲導(dǎo)波的混凝土泵車臂架的損傷監(jiān)測(cè)方法研究[D];南京航空航天大學(xué);2015年

2 白利;主動(dòng)Lamb波無基準(zhǔn)結(jié)構(gòu)健康監(jiān)測(cè)方法研究[D];南京郵電大學(xué);2014年

3 徐穎娣;基于Lamb波主動(dòng)監(jiān)測(cè)技術(shù)的復(fù)合材料結(jié)構(gòu)損傷定位研究[D];南京航空航天大學(xué);2004年

，

本文編號(hào)：2024028