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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 尤春風(Chun-Fong You) | |
dc.contributor.author | Hung-Chun Chen | en |
dc.contributor.author | 陳泓均 | zh_TW |
dc.date.accessioned | 2021-06-16T17:51:31Z | - |
dc.date.available | 2014-08-17 | |
dc.date.copyright | 2012-08-17 | |
dc.date.issued | 2012 | |
dc.date.submitted | 2012-08-13 | |
dc.identifier.citation | [1] Chivate P.N and Jablokow A.G, “Review of surface representations and fitting for reverse engineering,” Computer Integrated Manufacturing Systems, Vol. 8, No. 3, pp. 193-204, August 1995.
[2] Fang L. and Gossard D.C, “Multidimensional curve fitting to unorganized data points by nonlinear minimization,” Computer-Aided Design, Vol. 27, No. 1, pp. 48-58, January 1995. [3] Hildebrandt, K., Polthier, K. and Wardetzky, M. ,“Smooth feature lines on surface meshes,” Symposium on Geometry Processing, pp.85-90, 2005. [4] Heidrich W., Bartels R. and Labahn G., “Fitting uncertain data with NUBRS,” Proceedings of Chamonix, pp. 1-8, 1996. [5] Lancaster P, Salkauskas K. 1986. “Curve and surface fitting,” Academic Press. [6] Ma W. and Kruth JP, “Parameterization of randomly measured points for least squares fitting of B-spline curves and surfaces,” Computer-Aided Design, Vol. 27, No. 9, pp. 663-675, September 1995. [7] Piegl, L. and Tiller, W., The NURBS book 2nd ed., Springer, 1997 [8] Thirion, J. P., “The extremal mesh and the understanding of 3D surfaces,” International Journal of Computer Vision, Vol.19, No.2, pp115-128, 1996 [9] Weiler, K., “Edge-based data structures for solid modeling in curved-surface environments,” IEEE Computer Graphics and Applications, Vol.5, No.1, pp.21-40, 1985. [10] Weiss V., Andor L., Renner G., Varady T., “Advanced surface fitting techniques,” Computer Aided Geometric Design, Vol. 19, No. 1, pp. 19-42, January 2002. [11] Wang W., Pottmann H. and Liu Y., “Fitting B-spline curves to points clouds by squared distance minimization,” HKU CS Tech Report TR-2004-11, 2004. [12] 尤春風,Spring Solid System實體模型系統,國立台灣大學實體模型系統實驗室。 [13] 王大堃,汽車鈑金模面設計與建構工具,國立台灣大學機械工程學研究所碩士論文,2011。 [14] 李孟貞,三角網格調整與曲面重建應用於汽車鈑金模面之回彈補正,國立台灣大學機械工程學研究所碩士論文,2012。 [15] 林友瑜,汽車鈑件之三角網格塊處理與B-spline曲面重建,國立台灣大學機械工程研究所碩士論文,2010。 [16] 曾凱威,三角網格分割與曲面重建於汽車鈑件之應用,國立台灣大學機械工程研究所碩士論文,2008。 [17] 鄭欽元,散亂點資料重健B-spline曲面之研究,國立台灣大學機械工程學研究所碩士論文,2007。 [18] 鄭欽仁,汽車鈑金結構件沖壓模具工法排程,國立台灣大學機械工程學研究所碩士論文,2012。 [19] 劉昆育,汽車鈑金衝壓模具設計之鈑金製程規劃,國立台灣大學機械工程研究所碩士論文,2010。 [20] CATIA V5 Automation, CATIA V5 R17, Dassault Systems, 2006 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64510 | - |
dc.description.abstract | 為了達到車身輕量化之目的,可以採用鋁、鎂合金等輕金屬來代替原材料,或是減少汽車鈑金厚度來達到其目的。但輕金屬價格居高不下,故各大汽車廠使用先進高強度鋼鈑為主。高強度鋼鈑相較於傳統鋼材具較高強度,因此可於碰撞法規要求下,適度減少材料厚度,而能夠達到車身減重目的。但高強度鋼鈑於沖壓製程中會產生嚴重的回彈情況,若仍以傳統方式透過試模、修模的補償方式,不僅增加模具開發的時間成本。
隨著電腦硬體開發,CAE軟體能夠模擬鈑金沖壓過程與預測鈑金的回彈量及補償。但CAE分析軟體預測的回彈補償分析輸出檔案為網格格式,需要再重建模面CAD檔案。本研究提出一套完整、有效率自動化重建補償曲面方法,透過輸入端的原始曲面與補償前、後網格三項資訊。首先依照原始曲面做分群,達到網格與曲面互相對應。接著透過原始曲面所提供的參數,利用最小平方法與平滑函數依序重建補償曲面。本研究提供重建曲面參數化調整,以及快速自動化重建,可以減少汽車廠開發時程,增加開發效率。 | zh_TW |
dc.description.abstract | Using light metals like aluminum and magnesium alloys instead of raw materials, or reducing the thickness of automotive sheet metal can help achieve the objective of decreasing the weight of the car body. However, since the light metal prices remain high, advanced high strength steel (AHSS) is the main material for automotive sheet applications. High-strength steel, compared with traditional steel, possesses higher strength; therefore, by reducing the thickness of the material, high-strength steel can still be used to achieve the purpose of body weight loss in accordance with the collision regulations. However, a serious springback will occur during the high strength steel stamping process. By still applying the traditional method of compensation like mode trial and mode repairing will increase the time cost of mold development.
With the development of computer hardware, CAE can not only simulate the sheet metal stamping process, but also predict the springback of sheet metal and compensation. However, the output of the springback compensation analysis by CAE software is in the mesh format, so it needs to be reconstructed as the CAD surface file. This study proposes a complete set of efficient and automated method to rebuild the compensation surface by entering the following three data: the original surface, the mesh before compensation and the mesh after compensation. First, the segmentation process is applied in accordance with the original surface to make the mesh and surface correspond to each other. Then, through the parameters of the original surface, the least squares method (LSQ) and smoothing function (Energy function) are put in use to rebuild the compensation surface in sequence, and thus complete the mold surface springback compensation process. This study provides the parametric adjustment on reconstruction of surface and the method of fast automated reconstruction, which can decrease the development time of automobiles and therefore increase the development efficiency. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T17:51:31Z (GMT). No. of bitstreams: 1 ntu-101-R99522625-1.pdf: 7620402 bytes, checksum: 5496a5cdaa8baefabdddd051fc127ffa (MD5) Previous issue date: 2012 | en |
dc.description.tableofcontents | 誌謝 I
摘要 II Abstract III 目錄 V 圖目錄 VIII 表目錄 XI 第一章 緒論 1 1.1 研究動機 1 1.2 研究目的 4 1.3 研究背景 5 1.4 論文架構 8 第二章 背景知識 10 2.1 網格分群 10 2.1.1 網格拓樸架構資訊 10 2.1.2 網格分群資訊 14 2.2 曲線、曲面重建與嵌合 16 2.2.1 B-spline資料介紹 16 2.2.2 曲面與曲線之重建與嵌合 22 第三章 網格分群 25 3.1 網格分群前處理 26 3.1.1 網格點資料過濾 27 3.1.2 網格邊界定義 28 3.2 網格分群後處理 32 3.2.1 網格區域成長 32 第四章 曲面資料重建 37 4.1 曲面邊界線重建 37 4.1.1 最小平方法建立B-spline曲線 38 4.1.2 內插法建立B-spline曲線 42 4.2 曲面資料重建前置動作 45 4.2.1 曲面細分 45 4.2.2 細分範圍判定 48 4.3 曲面資料重建 50 4.3.1 散亂群點曲面重建 51 4.3.2 曲面平滑函數 53 4.4 曲面嵌合 53 4.5 曲面嵌合效能比較 57 4.5.1 重建時間 57 4.5.2 重建誤差 65 4.6 面資料建立 68 第五章 實例驗證與討論 70 5.1 系統介面與功能簡介 70 5.1.1 系統介面 71 5.1.2 功能介紹 71 5.2 流程簡介 72 5.2.1 創建新專案 74 5.2.2 輸入初始資料 75 5.2.3 網格分群 76 5.2.4 曲面重建 79 5.2.5 自動化曲面補償 80 5.3 結果輸出 80 5.3.1 資料比對 81 5.3.2 汽車外覆蓋件輸出結果 92 第六章 結論與未來展望 95 6.1 研究成果與結論 95 6.2 未來展望 96 參考文獻 98 附錄A 曲線與曲面之嵌合 101 作者簡歷 110 | |
dc.language.iso | zh-TW | |
dc.title | 曲面嵌合應用於汽車鈑金回彈補正 | zh_TW |
dc.title | Application of Surface Fitting for Springback Compensation of Automobile Sheet Metal Die Face | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 鍾添東(Tien-Tung Chung),陳俊銘(Jyun-Ming Chen) | |
dc.subject.keyword | 三角網格,回彈補償,曲面重建, | zh_TW |
dc.subject.keyword | triangular mesh,springback compensation,surface reconstruction, | en |
dc.relation.page | 110 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2012-08-13 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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