變形特征分析中散斑測量數(shù)據(jù)的處理與開發(fā)
本文選題:散斑測量 + 變形特征; 參考:《東華理工大學(xué)》2017年碩士論文
【摘要】:三維數(shù)字散斑測量方法是一種先進的光學(xué)測量方法。它是利用采集到的前后變形圖像,通過散斑圖像的相關(guān)匹配,相關(guān)計算,三維空間重構(gòu)得到物體表面的三維形貌與變形。不僅具有傳統(tǒng)光學(xué)測量法的非接觸式和全場測量等優(yōu)點,且有良好的環(huán)境適應(yīng)能力。本文首先介紹了目前常用的測量方法及數(shù)字散斑相關(guān)方法的基本原理,然后基于三維數(shù)字散斑相關(guān)方法的眾多優(yōu)點,將三維數(shù)字散斑相關(guān)方法引入不同切口板材變形測量當中,搭建了基于三維數(shù)字散斑相關(guān)法的不同切口板材受力變形測量系統(tǒng),并利用XJTUDIC應(yīng)變測量系統(tǒng)對不同切口板材受力變形特征進行了實際測量實驗,且對測量得到的不同切口板材的變形特性進行分析計算,得出特征圓弧半徑與切口尖銳程度的關(guān)系,這可成為描述切口尖銳程度對受力變形影響的重要表征參數(shù),為以后相關(guān)的力學(xué)研究提供基礎(chǔ)。其次以大量實驗數(shù)據(jù)為基礎(chǔ),利用多種擬合方法對三維數(shù)字散斑相關(guān)測量物體變形運動趨勢進行分析處理,得出擬合的精度和誤差。然后通過比較高斯曲線擬合法與最小二乘多項式擬合法在物體整個變形過程中對變形數(shù)據(jù)處理的效果,得出最小二乘多項式擬合可適用于分析處理三維數(shù)字散斑測量物體變形實驗中的位移數(shù)據(jù),處理的結(jié)果符合板材受力變形運動趨勢。最后,針對傳統(tǒng)的數(shù)字散斑相關(guān)法測量較大角度旋轉(zhuǎn)或者出現(xiàn)轉(zhuǎn)動的變形物體的精度不足,引入了一種改進的相關(guān)匹配算法,并通過搭建風(fēng)扇旋轉(zhuǎn)葉片變形測量系統(tǒng)驗證引入的改進算法能提高三維數(shù)字散斑相關(guān)法測量較大角度旋轉(zhuǎn)物體變形的精度。
[Abstract]:The 3D digital speckle measurement method is an advanced optical measurement method. It is used to collect images before and after deformation, the speckle image correlation matching, correlation calculation, 3D reconstructed 3-D surface shape and deformation. The non-contact and full field measurement has the advantages of not only has the traditional optical measurement method. And have a good ability to adapt to the environment. This paper introduces the basic principle of speckle correlation method at present common measuring methods and digital, and many advantages of 3D digital speckle correlation method based on three-dimensional digital speckle correlation method to introduce different incision plate deformation measurement, build the three-dimensional digital speckle correlation method is different based on the stress and deformation of plate incision measurement system, and the use of XJTUDIC strain measuring system for different characteristics of deformation force plate incision was measured and the measuring experiment. Calculation and analysis of deformation characteristics of different incision plate is obtained, the relationship between the characteristics of arc radius and notch sharpness, which can be described on the important parameters of sharp notch stress deformation, mechanical and provide the basis for later related research. Secondly on the basis of experimental data, the 3D digital speckle correlation measurement of object deformation movement are analyzed using various fitting methods, the precision and error of fitting. Then through the comparison of Gauss curve fitting and least-squares polynomial fitting on the object in the whole deformation process on the deformation data processing results, the least squares polynomial fitting can be applied to the analysis of 3D digital speckle measurement of object deformation displacement experiment data the processing result is consistent with the deformation trend of sheet steel stress. Finally, in view of the traditional digital speckle phase The method for measuring large angle rotation or rotation of the deformed object is lack of precision, introduces a correlation matching algorithm, and improve the accuracy of three-dimensional digital speckle correlation method to measure the scattered large rotation of object deformation by improving the algorithm to build the rotation of the fan blade deformation measurement system is introduced to verify.
【學(xué)位授予單位】:東華理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TP391.41
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