机械工程学报

REN Kun

FU Jianzhong

CHEN Zichen
College of Mechanical and Energy
Engineering,
Zhejiang University,
Hangzhou 310027, China

LOOK-AHEAD ALGORITHM FOR VELOCITY CONTROL BASED ON PARAMETERIZED CURVE INTERPOLATOR*

Abstract: To avoid suffering gouge and transient overshooting in high speed cutting machining, a novel parameterized curve interpolator model with velocity look-ahead algorithm is proposed. Based on a prearrangement step interpolation algorithm for parameterized curves and considering high curvature points, parameterized curve tool path is divided into acceleration segments and deceleration segments by look-ahead algorithm. Under condition of characteristics of acceleration and deceleration stored in control system, deceleration before high curvature points and acceleration after high curvature points are realized in real-time in high speed cutting machining. Based on new parameterized curve interpolator model with velocity look-ahead algorithm, a real cubic spline is machined simulativly. The simulation results show that velocity look-ahead algorithm improves velocity changing more smoothly.

Key words: High speed cutting machining Parameterized curve interpolator Look-ahead algorithm

* This project is supported by Special Project for Key Mechatronic Equipment of Zhejiang Province, China (No. 2006C11067) and Science & Technology Project of Zhejiang Province, China (No. 2005E10049). Received April 5, 2007; received in revised form November 26, 2007; accepted December 21, 2007

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Biographical notes

REN Kun is currently a PhD candidate in Zhejiang University, China. He received his MS degree from College of Mechanical and Energy Engineering, Zhejiang University, China, in 2003. His research interests are in improving CAM system quality and CNC control system, etc.
Tel: +86-571-87951907; E-mail: renkun_2008@sina.com

FU Jianzhong is currently a professor in Zhejiang University, China. He received his PhD degree from Zhejiang University, China, in 1996. His research interests include thermal deformation, numerical control technology and MEMS.
Tel: +86-571-87951906; E-mail: fjz@zju.edu.cn

CHEN Zichen is currently a professor in Zhejiang University, China. He received his PhD degree from Zhejiang University, China, in 1989. His research interests include thermal deformation, numerical control technology and MEMS.
Tel: +86-571-87951906; E-mail: chenzc@zju.edu.cn

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