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姓名 李聖民(Sheng-Ming Lee) 查詢紙本館藏 畢業系所 機械工程學系 論文名稱 CNC系統不連續NURBS曲線之處理
(An approach to the Discontinuous NURBS Curves on CNC system)相關論文 檔案 [Endnote RIS 格式] [Bibtex 格式] [相關文章] [文章引用] [完整記錄] [館藏目錄] [檢視] [下載]
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摘要(中) 摘 要
本論文主要討論NURBS(Non-Uniform Rational B-Spline)曲線在CNC系統裡,所遭遇到的不連續問題。傳統的CNC工具機大都以線與圓弧來逼近複雜的圖形,然而,NURBS曲線所表現的是正確的曲線,而不是近似的結果。也因此在數學的表現上沒有誤差的問題。然而,當工具機處理到圓弧接曲線,曲線接直線等等不連續的線條相接時,如果希望系統能縮短加工時間的話,除了提高工具機加工速度外,就是減少加減速時間,然而,許多由CAM軟體產生的NURBS曲線彼此之間是不連續的,因此每個NURBS曲線就得加減速一次,本篇論文即是讓不同的NURBS曲線以一個小曲線連接使得工具機能平順地開始另一條曲線。摘要(英) Abstract
This paper discusses the problem of the discontinuous NURBS(Non-Uniform Rational B-Spline) curves on CNC system. The traditional CNC system generally approximates the complex shape by line and circular arc. When the line meets circular arc or circular arc meets circular arc, the system has to stop at the end of every segments. If we want to speed up the machining speed, we have to increase the speed of motors or decreases the time of acceleration and deceleration. But it is usually discontinuous between NURBS curves. It has to decelerate at the end of curve and accelerate at the beginning of the next curve. This paper discusses how to insert a short curve to smooth the discontinuous curves.關鍵字(中) ★ 平滑化 關鍵字(英) ★ NURBS
★ smooth論文目次 摘 要 I
致 謝 II
目 錄 III
第一章 導論 IV
第二章 NURBS曲線的基本介紹 V
第三章 曲線的處理方法 VI
第四章 速度控制的方法 VII
第五章 模擬的結果 VIII
第六章 結論及未來發展 IX
附 錄 X參考文獻 [1]. Versprille, K.J., “Computer-Aided Design Application of the Rational B-spline Approximation form,” Ph.D. dissertation, Syracuse Univ.,1975.
[2]. Erkorkmaz, K. and Altintas, Y., “High speed CNC system design. Part I: jerk limited trajectory generation and quintic spline interpolation”, Internal Journal of Machine Tools & Manufacture, Vol.41, Issue 9, pp.1323-1345, 2001.
[3]. Zang, Q. G.; Greenway, R. B., “Development and implementation of a NURBS curve motion interpolator”, Robotics and Computer-Integrated Manufacturing, Vol. 14, Issue 1,pp.27-36, 1998.
[4]. Sun, S. and Egerstedt, M. B., “Control Theoretic Smoothing Splines”, IEEE Transactions on Automatic Control, Vol. 45, issue 12, pp. 2271-2279, 2000.
[5]. Fleisig, R.V. and Spence, A.D., “ A constant feed and reduced angular acceleration Interpolation Algorithm for Multi-axis Machining”, Computer Aided Design, Vol.33, Issue 1, pp.1-15, 2001.
[6]. Ye, J. and Qu, R.,” Fairing of Parametric Cubic Splines”, Mathematical and Computer Modeling, Vol.30, Issue 5-6, pp.121-131, 1999
[7]. Piegl, L. and Tiller, W., “ The NURBS Book” ,New York: Springer-Verlag, 1997.指導教授 張江南、董必正
(Ching-nan Chang、Pi-cheng Tung)審核日期 2002-7-12 推文 facebook plurk twitter funp google live udn HD myshare reddit netvibes friend youpush delicious baidu 網路書籤 Google bookmarks del.icio.us hemidemi myshare