Abstract: To overcome the deficiencies of current Non-Uniform Rational B-Spline (NURBS) interpolation algorithm,an optimized NURBS curve interpolation algorithm was proposed.An S-curve Acceleration/Deceleration (Acc/Dec) control method was adopted,which not only optimized the look-ahead process,but also considered the case of short spline in the trace-back.The proposed interpolation algorithm could interpolate both the long spline and the short spline with uniform method.Meanwhile,the machining efficiency was improved by adding the circular buffer and pre-interpolation (non-off-line) and enhanced the real-time performance by reasonable arrangement of the interpolation tasks.The effectiveness of the proposed method were confirmed by MATLAB simulation.

Key words: numerical control system, non-uniform rational B-spline, interpolation algorithm, look-ahead

摘要： 为弥补目前非均匀有理B样条插补算法的不足,提出一种优化的非均匀有理B样条曲线插补算法。算法采用插补前S曲线加减速方法,不仅优化了前瞻过程,而且在回溯过程中考虑了短样条的情况。算法对长样条和短样条非均匀有理B样条曲线能用统一的方法进行插补,通过引入环形缓冲区和预插补(非离线),提高了加工效率,同时合理地安排插补任务增强了系统的实时性。通过MATLAB仿真,验证了算法的有效性。

关键词: 数控系统, 非均匀有理Ｂ样条, 插补算法, 前瞻