一种实时前瞻的自适应NURBS插补算法  

An Adaptive NURBS Interpolator with Real-Time Look-Ahead Function

作　　者：杜道山[1] 燕存良[1] 李从心[1] 

机构地区：[1]上海交通大学国家模具CAD工程研究中心,上海200030

出　　处：《上海交通大学学报》2006年第5期843-847,共5页Journal of Shanghai Jiaotong University

摘　　要：在考虑速度稳定性和加工误差精度的基础上,设计了一个非均匀有理B样条曲线(Non-Uniform Rational B-Spline,NURBS)的实时自适应插补系统.开发的插补系统能够在大部分的插补过程中保持进给速度稳定,并且根据曲线的形状,自适应地调整进给速度,通过一个实时的前瞻加减速处理模块,在速度变化敏感区对加减速进行处理,同时满足了机床加减速能力的要求.通过NURBS曲线插补仿真计算的例子,显示了开发的实时自适应插补系统能够满足高速高精度插补的要求,验证了所设计的实时前瞻自适应NURBS插补算法的可行性.A real-time adaptive interpolator was developed for non-uniform rational B-spline curves （NURBS） interpolation with considering the maximum acceleration/deceleration of machine tool. In this proposed interpolator, both constant feedrate and high chord accuracy are achieved while the inconsistent of feedrate is reduced dramatically. In order to deal with the acceleration/deceleration around the feedrate sensitive sharp corners, a look ahead function is introduced to detect and adjust the feedrate adaptively. Finally, a case study was conducted to evaluate the feasibility of the developed interpolator.

关 键 词：非均匀有理B样条 自适应插补器 数控系统 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]