點(diǎn)云數(shù)據(jù)的拉伸曲面特征提取

機(jī)械設(shè)計(jì)制造及其自動化論文，論文編號:JX1170  論文字?jǐn)?shù):13349.頁數(shù):61

摘 要
 隨著CAD/CAM/CAPP一體化技術(shù)的發(fā)展，要求幾何模型能夠表示包含體現(xiàn)產(chǎn)品設(shè)計(jì)意圖和功能的高層次的工程信息，因而出現(xiàn)了同時(shí)面向設(shè)計(jì)過程和制造過程，包含產(chǎn)品工程信息的幾何造型方法，即特征造型(Feature Modeling)。隨著特征造型技術(shù)在機(jī)械領(lǐng)域中的應(yīng)用越來越廣泛,對于反求工程也提出了對于特征提取的要求.本論文提出在反求工程中點(diǎn)云數(shù)據(jù)拉伸曲面特征提取的一種方法.首先,估算點(diǎn)云的主曲率和主方向,計(jì)算最小主方向的平均方向;利用去除含有與最小主方向平均值相差最大的點(diǎn)的方法進(jìn)行噪聲處理,在此的基礎(chǔ)上得到曲面的拉伸方向;上述是得到拉伸方向的原理,我們可以利用計(jì)算機(jī)技術(shù)實(shí)現(xiàn).把三標(biāo)機(jī)測量機(jī)對實(shí)物測量所得的數(shù)據(jù)通過IGES的格式輸入到編譯的REFIT程序,實(shí)現(xiàn)計(jì)算機(jī)與軟件的通信.在REFIT軟件中在拾取點(diǎn)云之后,通過以上的算法,提取拉伸的方向.REFIT軟件是以Microsoft Visual C++ 6.0為編譯平臺,實(shí)現(xiàn)的語言是C++.

關(guān)鍵詞:反求工程,特征造型,曲面特征,拉伸方向

Abstract
 Since cad/cam/capp develop close-coupled, the mold is required for the fuction which can express the products design purpose.then there comes a new method to design model,it turns in the direction of design process and making process.this is named Feature Modeling. This paper gives out one method to get the feature of the extruding surface of the point cloud. First at all, estimate the average value of the main curvature and the main direction; then, calculate the average value of the min direction of every point of the point cloud . Do the filtration which kicks out those points have long distance to the average value of the min direction. On the basis of last step program can get initial direction of the extruding surface. All the words above are discussing the theory , and now that can use the computer to move the theory to the reality. The data which is measured from Three Coordinate Measuring Machine transforms to the format of IGES . then guide into the program named refit . It finishes the communication between the software refit and computer. The program finishes three steps ,the first  is getting data, the second is reaching arithmetic , the third is getting the result. By the way ,refit  uses Microsoft Visual C++ 6.0 as the platform and the computer language is c++.
keywords: Reverse Engineering , Feature Modeling ,the feature of the extruding surface ,the direction to extrude ,

目錄
摘 要 i
Abstract ii
目錄 iii
第一章  緒論 1
1.1   研究背景 1
1.3 研究方法與系統(tǒng)描述 4
第二章  逆向工程系統(tǒng)軟件框架 5
2.1  軟件開發(fā)工具 5
2.2 軟件框架設(shè)計(jì) 5
2.2.1軟件界面介紹 6
2.2.2 輸入模塊 7
2.2.3擬合模塊 10
2.2.4 顯示模塊 13
2.2.5 存儲模塊 13
第三章 算法詳解 15
3.1拉伸面的主曲率為零的主方向 15
3.2方向數(shù)據(jù)的平均方向及噪聲處理 16
3.2.1 平均方向 16
3.2.2 基于方差分析的噪聲去除算法 17
3.3 基于點(diǎn)云的快速曲率估算 19
3.4拉伸方向的確定 19
3.5 噪聲去除 19
第四章 特征提取； 20
4.1 菜單調(diào)用對話框 20
4.2 點(diǎn)云拾取 22
4.3曲率估算與繼承點(diǎn)云數(shù)據(jù)的屬性 23
4.4 計(jì)算最小主方向的平均值 23
4.5 噪聲去除處理 23
計(jì)算結(jié)果 25
參考文獻(xiàn) 29
致  謝 30
附錄表一 31
附錄表二 34
附錄表三 40
源程序 1