本文選題：Lamb波 + 結構健康監(jiān)測　； 參考：《南京航空航天大學》2017年碩士論文

【摘要】：基于Lamb波的結構健康監(jiān)測技術能夠在線實時地檢測結構中的微小損傷,極大地維護了結構的安全性。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波的主動健康監(jiān)測技術。首先,介紹了Lamb波的基本理論及其傳播特性。分析了Lamb波的激勵方法,對激勵信號的參數進行了分析和選擇。實現(xiàn)了軟硬件的交互。其次,研究了層析法的原理,定義了不相關系數,并提出了損傷定位概率成像方法。根據結構健康監(jiān)測系統(tǒng)的工作原理,搭建了實驗平臺,設計了損傷監(jiān)測程序。計算了監(jiān)測區(qū)域的空間分辨率,并分析了單損傷和多損傷的定位。再次,分析了針對不同檢測原理的定位方法,并計算了空間分辨率與損傷識別之間的關系。研究了不相關系數與腐蝕程度的關系,判斷了損傷的存在性,提出了腐蝕程度的識別方法。分析了橢圓因子對損傷定位結果的影響,并對腐蝕損傷和模擬損傷進行了定位。最后,針對傳統(tǒng)方法需要Lamb波傳播速度進行損傷定位的缺點,利用MPF花形傳感器對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花形傳感器的響應特性,通過沖擊標定方法得到了花形傳感器的電壓響應幅值與Lamb波傳播方向之間精確的函數關系。定義了一種損傷指標,并提出了基于角度識別的損傷定位方法,評估了監(jiān)控區(qū)域的角度分辨率。實驗結果表明,利用壓電線陣和MPF花形傳感器可以精確地對損傷進行定位成像。
[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.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP212;TP274

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