A study of dynamics of feedrate system based interpolator for NURBS curve

摘要：

In this paper,the entire model of numerical control interpolator,servo unit and feedrate system is given and solved.And a new interpolator is proposed.Firstly,according to adaptive feedrate trajectory planning algorithm,reference velocity of current interpolator period is calculated.According to the geometry characteristics,velocity limit is set based on the curvature.In every interpolation period,the dynamic equations are solved to gain the maximum need torque if current reference velocity is transport to servo unit.If the needed torque is greater than maximum one that servo system can provide,a proper deceleration is applied to decrease the reference velocity.At last first-order Taylors expansion approximation is employed to calculate the new interpolation point.This algorithm can adjust the feedrate where the curvature is greater relatively to meet the chord error satisfaction,and the velocity generated is smoother relatively.This algorithm can ensure the servo units can achieve the interpolation point in time,in case great follow error occurs.

关键词： NURBS interpolator dynamics of machine tools adaptive feedrate chord error curvature

作者: Liu Yu Liu Jie Deng Zilong

作者单位: School of Mechanical Engineering & AutomationNortheastern University,Shenyang,China School of Mechanical Engineering & Automation Northeastern University,Shenyang,China

会议类型: 国际会议

会议名称: International Conference on Modelling,Identification and Control(模拟、鉴定、控制国际会议)

会议地点: 上海

会议语种:英文

在线出版日期: 2008-06-29（万方平台首次上网日期，不代表论文的发表时间）