本文選題：點(diǎn)云數(shù)據(jù) + 造型件特征線(xiàn)�。� 參考：《長(zhǎng)安大學(xué)》2014年碩士論文

【摘要】：對(duì)現(xiàn)有產(chǎn)品或樣機(jī)外觀造型件進(jìn)行仿制或改良，通常應(yīng)用逆向工程方式進(jìn)行。采用三維測(cè)量設(shè)備對(duì)造型件外表面進(jìn)行測(cè)量，獲取三維片點(diǎn)云數(shù)據(jù)，對(duì)片點(diǎn)云數(shù)據(jù)應(yīng)用專(zhuān)用軟件進(jìn)行拼接、修整等處理，得到造型件的點(diǎn)云數(shù)字模型，應(yīng)用數(shù)模進(jìn)行造型件仿真與創(chuàng)新是逆向設(shè)計(jì)的主要過(guò)程。 文中根據(jù)造型件數(shù)模創(chuàng)建過(guò)程，對(duì)影響造型件數(shù)模精度的因素及其控制方法進(jìn)行了研究。首先應(yīng)用三掃描儀VIVID910對(duì)產(chǎn)品造型件（文中取某電動(dòng)車(chē)前臉）進(jìn)行外表面片點(diǎn)云數(shù)據(jù)采集，應(yīng)用InnovMetric Software逆向設(shè)計(jì)軟件對(duì)片點(diǎn)云數(shù)據(jù)拼接、去噪、修補(bǔ)、多視對(duì)齊、精簡(jiǎn)、光順與分割，獲得低精度的造型件數(shù)字模型。對(duì)該數(shù)模按造型件幾何形態(tài)特征與數(shù)模精度要求，應(yīng)用InnovMetric Software軟件構(gòu)建一組特征平面（其數(shù)量與建模精度有關(guān)），提取特征平面與造型件數(shù)模的截面線(xiàn)，即為造型件的幾何特征線(xiàn)。同樣根據(jù)特征線(xiàn)特點(diǎn)與建模精度要求，在每條特征線(xiàn)上取一組特征點(diǎn)，將其作為特征線(xiàn)的型值點(diǎn)。根據(jù)造型件區(qū)域分割，同一區(qū)域的特征線(xiàn)取相同數(shù)量的特征點(diǎn)，分別用B樣條曲線(xiàn)擬合各區(qū)域特征線(xiàn)，探討造型件特征線(xiàn)按區(qū)域的統(tǒng)一參數(shù)化表示方法。 集成MATLAB2010b軟件、Microsoft SQLServer2005數(shù)據(jù)庫(kù)技術(shù)，研究產(chǎn)品造型件特征線(xiàn)信息庫(kù)系統(tǒng)開(kāi)發(fā)方法與技術(shù)，使產(chǎn)品造型件眾多特征線(xiàn)的信息、幾何曲面信息實(shí)現(xiàn)自動(dòng)化管理。 以造型件外表面幾何特征線(xiàn)上的特征點(diǎn)為型值點(diǎn)，應(yīng)用積累弦長(zhǎng)參數(shù)化方法、最小二乘法計(jì)算滿(mǎn)足精度要求的控制點(diǎn)，構(gòu)造B樣條曲線(xiàn)，，用該B樣條曲線(xiàn)代替特征線(xiàn)。造型件幾何曲面擬合可看作兩階段B樣條曲線(xiàn)擬合，即先對(duì)橫向的每一特征線(xiàn)進(jìn)行B樣條曲線(xiàn)擬合，以此為基礎(chǔ)，再在縱向進(jìn)行B樣條曲線(xiàn)擬合，即可構(gòu)造出造型件外表面的近似網(wǎng)格曲面。在Pro/E中應(yīng)用曲率分析等對(duì)重構(gòu)曲面進(jìn)行誤差分析，探討了建立了給定精度的造型件曲面重構(gòu)方法與技術(shù)。 應(yīng)用軟件UG自動(dòng)生成實(shí)體圖案，裝飾電動(dòng)車(chē)前臉（Matlab數(shù)模）生成新的前臉造型方案，將Matlab數(shù)模以Pro/E軟件為橋梁保存為STEP格式。數(shù)模與實(shí)體圖案以軟件犀牛插入打開(kāi)，通過(guò)UV展開(kāi)功能實(shí)現(xiàn)實(shí)體圖案與電動(dòng)車(chē)前臉的結(jié)合。 應(yīng)用造型件創(chuàng)新方案數(shù)模直接進(jìn)行注塑模具設(shè)計(jì)。在Pro/E軟件中通過(guò)布爾運(yùn)算實(shí)現(xiàn)型腔和型芯數(shù)模構(gòu)建，并用Pro/E NC模塊、后置處理模塊編制能被數(shù)控機(jī)床控制系統(tǒng)識(shí)別的數(shù)控加工程序。
[Abstract]:The existing products or prototypes are modeled or modified, usually by reverse engineering. The 3D measuring equipment is used to measure the outer surface of the molded part, and the point cloud data is obtained, and the point cloud digital model of the molded part is obtained by using the special software for splicing, trimming, and so on. It is the main process of reverse design to use digital model to simulate and innovate modeling parts. In this paper, the factors that affect the precision of digital models of moulding parts and their control methods are studied according to the process of creating digital models of moulding parts. In this paper, the outside surface spot cloud data is collected by using the three-scanner VIVID910, and the point cloud data is spliced, de-noised, repaired, multi-view aligned and simplified by InnovMetric Software reverse design software. Smoothing and segmenting to obtain the digital model of low precision molded parts. According to the requirements of geometric shape feature and digital model precision, the digital model is used to construct a set of feature plane (its quantity is related to the modeling precision) by using InnovMetric Software software. The section line of feature plane and digital model of modeling part is extracted, that is, the geometric feature line of modeling part. According to the characteristics of feature line and the requirement of modeling precision, a set of feature points are taken on each feature line, which is regarded as the value point of feature line. According to the regional segmentation of modeling parts, the feature lines of the same area take the same number of feature points, and the B-spline curves are used to fit the feature lines of each region respectively, and the unified parameterized representation method of the feature lines of the modeling parts according to the region is discussed. Integrating MATLAB2010b software with Microsoft SQLServer2005 database technology, this paper studies the development method and technology of product modeling part feature line information base system, so that the information of many feature lines and geometric surface information of product modeling parts can be automatically managed. Taking the characteristic points on the geometric feature line of the exterior surface of the molded part as the type value, the accumulated chord length parameterization method and the least square method are used to calculate the control points which meet the precision requirements. The B-spline curve is constructed, and the B-spline curve is used to replace the characteristic line. Geometric surface fitting of modeling parts can be regarded as two-stage B-spline curve fitting, that is, B-spline curve fitting for each transverse characteristic line is carried out first, and then B-spline curve fitting is carried out in longitudinal direction on the basis of B-spline curve fitting. The approximate mesh surface of the outer surface of the molded part can be constructed. In Pro/E, curvature analysis is used to analyze the error of reconstructed surface, and the method and technology of surface reconstruction with given precision are discussed. The software UG is used to automatically generate entity pattern and decorate the front face of electric vehicle (Matlab digital model) to generate a new front face modeling scheme. The Matlab digital model is saved to STEP format with Pro/E software as the bridge. Digital analog and solid patterns are inserted into the software rhinoceros, and the combination of the solid patterns and the front faces of electric vehicles is realized by UV expansion function. The design of injection mould is carried out directly by using the innovative scheme of moulding parts. The mold cavity and core digital model are constructed by Boolean operation in Pro/E software. The NC machining program which can be recognized by NC machine tool control system is programmed by Pro/E NC module and post processing module.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TB472

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