基于S曲线加减速的NURBS实时插补前瞻控制方法  

A Real-time Looking-forward NURBS Interpolation Algorithm Based on S-shape

作　　者：李建伟[1] 林浒 孙玉娥[1] 

机构地区：[1]中国科学院沈阳计算技术研究所,沈阳110171

出　　处：《组合机床与自动化加工技术》2009年第11期41-45,49,共6页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：2008年中国科学院知识创新工程重要项目(KGCX2-YW-119)

摘　　要：根据现有S曲线速度规划的插补算法,对影响机床加工的各种因素进行了分析,设计了一种基于动态前瞻的预测S曲线减速点的方法,解决了传统计算减速点存在的误差问题。本算法分为预处理和实时插补两部分,在预处理中将加工曲线按曲率的变化率进行分段,按段的类型进行实时插补,并且在段内进行动态前瞻,预测S曲线第三阶段起点。仿真实验结果表明,该插补算法能够在保证加工精度的前提下,实现速度和加速度的平滑过渡。According to the present S-shape accelerate/decelerate, analyzing the factors that affect the real machining, design a real-time looking-forward NURBS interpolation algorithm which can forecast the decelerating point based on S-shape accelerate/decelerate, solving the problem of the traditional way to calculate decelerating point which accompanied with error. This algorithm has a look-ahead interpolation and a real-time interpolation, firstly, the curve is dividing into some segments according to the different curvature movement after loo- king-ahead. The real-time interpolation is doing within the segments with a looking-forward process which can forcast the starting point of the third stage to the S-shape A/D. By the results of simulations, it demonstrated that this interpolator can get a smooth feedrate and accelerate profile with high machining accuracy.

关 键 词：NURBS S曲线速度规划 加速度平滑 动态前瞻 

分 类 号：TH16[机械工程—机械制造及自动化] TG65[金属学及工艺—金属切削加工及机床]