Real-time NURBS interpolator: application to short linear segments

The International Journal of Advanced Manufacturing Technology - 2008
Jun-Bin Wang1, Hong-Tzong Yau1
1Department of Mechanical Engineering, National Chung Cheng University, Chia-Yi, Republic of China

Tóm tắt

This study proposes the use of a real-time non-uniform rational B-spline (NURBS) interpolator with a look-ahead function to handle numerous short linear segments. The short linear segments conforming to the continuous short block (CSB) criterion can be fitted into NURBS curves in real time. A modified maximum feedrate equation based on the geometric characteristics of the fitting curves and the dynamics of the servo control system has been derived in this paper. Taking advantage of the multi-thread design and the look-ahead function, the real-time NURBS interpolator can process enough G01 block information and complete feedrate planning before interpolation. In addition, the S-shaped jerk-limited acceleration method is adopted for smoother feedrate profiles. Two part shapes, which possess more than 1,000 short linear segments, are tested on our PC-based real-time control system. Both simulation and experimental results verify the feasibility and precision of the proposed interpolation algorithm.

Từ khóa


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The International Journal of Advanced Manufacturing Technology

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