NURBS曲线实时插补中的速度规划算法  

Velocity Planning in the Real-time Interpolation Algorithm of NURBS Curve

作　　者：孙玉娥[1] 林浒 

机构地区：[1]中国科学院沈阳计算技术研究所,辽宁沈阳110171

出　　处：《小型微型计算机系统》2010年第6期1162-1165,共4页Journal of Chinese Computer Systems

基　　金：2007年国家科技支撑计划项目(2007BAF20B01)资助

摘　　要：大多数现有的NURBS曲线实时插补算法并未考虑速度方向的变化给各运动轴带来的影响,这会导致加工过程中单轴速度的剧烈变化.提出一种能保证各运动轴平稳运行的速度规划算法,它在满足精度要求的前提下,通过控制切向加速度和加加速度进行速度平滑,并根据各运动轴的当前速度和机床的实际性能再次调节进给速度,保证了机床的平稳运行.模拟实验证实了该算法的有效性.The influence of velocity direction change on single motion axes is not considered in most of the existing NURBS curve real-time interpolation algorithm,which may lead to sharply change of the single motion axes velocity during machining.An algorithm of velocity planning is proposed to ensure a stable running of all motion axes.It can get a smooth tangent velocity profile by control the acceleration and jerk firstly.And then adjust the feedrate again according to the current velocity of motion axes and the practical performance of CNC machine.The new algorithm can control chord-error within the specified range and ensure a stable running of all motion axes of the CNC machine.The efficiency of this algorithm is demonstrated by the results of simulations.

关 键 词：速度规划 NURBS 插补算法 柔性加工 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]