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浙江大学学报(工学版)
J4  2010, Vol. 44 Issue (1): 68-74    DOI: 10.3785/j.issn.1008-973X.2010.01.013
计算机科学技术     
三次C-Bézier螺线构造及其在道路设计中的应用
蔡华辉1,2,王国瑾1
（1.浙江大学 计算机图像图形研究所,CAD&CG国家重点实验室,浙江 杭州 310027；2.景德镇陶瓷学院 信息工程学院,江西 景德镇 333403）
Construction of cubic C-Bézier spiral and its application in highway design
CAI Hua-hui1,2, WANG Guo-jin1
(1.Institute of Computer Images and Graphics, State Key Laboratory of CAD&CG, Zhejiang University, Hangzhou 310027,
China;
2. School of Information Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China)
 全文: PDF 
摘要：

针对道路设计的工程需要,构造曲率单调且保号的平面三次C-Bézier螺线. 利用这条螺线,详细推导在道路设计等工业应用中直线和圆弧之间的过渡曲线. 如同工程中使用回旋曲线过渡一样,直线和圆弧之间用一条螺线过渡,圆弧与圆弧之间用一对C型或S型螺线过渡,两条直线之间用一对螺线过渡,当圆包含圆弧时用一条螺线过渡. 给出在前4种情况下螺线的具体表达式,第5种情况不一定有解. 由于直线、圆弧能够用C-Bézier曲线精确表示,可以在C-Bézier模式下统一处理整条道路设计问题,避免了以往采用Fresnel积分所表示的回旋曲线不适用于计算机辅助设计系统的情况．
关键词： C-Bé;  zier曲线;  回旋曲线;  单调曲率;  过渡曲线    
Abstract:

A planar cubic C-Bézier spiral with monotone curvature of constant sign was constructed to meet the requirement of highway design, and then the transition curves between straight lines and/or circular arcs were derived in detail. As it is done with clothoids in engineering, a single spiral is used for straight line to circular arc, two spirals suiting C-shaped or S-shaped transition for circular arc to circular arc, two spirals for straight line to straight line, and a single spiral for circular to circular arc when the latter is contained within the former. The concrete expressions for the first four cases were given. In the fifth case, the solution cannot always be obtained. Because straight line segments and circular arcs can be represented precisely by C-Bézier curves, the issues such as highway design can be handled in the system by C-Bézier model, avoiding the difficult situation for computer-aided design system to use the clothoids defined in terms of the Fresnel integral．
Key words: C-Bézier curve    clothoid    monotone curvature    transition curve
出版日期: 2010-02-04
:  TP 391  
基金资助:

国家自然科学基金资助项目（60933007, 60873111）.
通讯作者: 王国瑾，男，教授，博导.     E-mail: gjwang@hzcnc.com
作者简介: 蔡华辉（1975－），男，陕西安康人，博士，从事计算机辅助几何设计与计算机图形学研究.
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引用本文:

蔡华辉, 王国瑾. 三次C-Bézier螺线构造及其在道路设计中的应用[J]. J4, 2010, 44(1): 68-74.

CA Hua-Hui, WANG Guo-Jin. Construction of cubic C-Bézier spiral and its application in highway design. J4, 2010, 44(1): 68-74.

链接本文:

http://www.zjujournals.com/xueshu/eng/CN/10.3785/j.issn.1008-973X.2010.01.013    或    http://www.zjujournals.com/xueshu/eng/CN/Y2010/V44/I1/68

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