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《Journal of Engineering Graphics》 2005-01
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Automatic Drawing of Clothoid Curve for Railway or Highway Based on AutoCAD

QIU Rong-mao1, WANG Da-ming2, ZHOU Qiao-yong1 (1.College of Civil Engineering, Shijiazhuang Railway Institute, Shijiazhuang 050043, China;2.College of Mechanical Engineering, Shijiazhuang Railway Institute,Shijiazhuang 050043, China)  
This paper Introduces the concept of formation, primary points and synthetic elements of the clothoid curve in line engineering drawing for Railway or Highway. The equation describing clothoid curve and formula calculating primary points coordinate of clothoid curve are presented by means of geometry, calculus and progression. Multiple alternations of user coordinate make the user coordinate of AutoCAD is identical with that of clothoid curve. On the basis of this, by programming of AutoLISP, automatic drawing of clothoid curve along with circular is achieved.
【CateGory Index】: TP391.72
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