一种实时前瞻的微线段直接插补算法

A real-time look-ahead direct interpolation algorithm for small line

结合匀变速DDA精插补算法、变插补周期技术和实时前瞻技术,提出了一种新的微线段直接插补算法.采用两级插补模式,粗插补由速度规划和实时前瞻任务构成,精插补采用匀变速DDA精插补算法.首先通过正、反向速度规划,计算各微线段允许的最大拐角速度;其次,根据前瞻数据量和微线段允许速度实时调整实际拐角速度;最后,调用匀变速DDA精插补算法实现脉冲输出.每个微线段不再由粗插补分割为更小的微线段,而是直接由精插补器来实现插补,故算法简单,精度高.实测结果表明,该算法无理论误差,精度高,加工效率较高.

Combined with a uniformly accelerated DDA（digital differential analyzer） interpolation algorithm,variable period interpolation technology and real-time lookahead technology,a new direct interpolation algorithm for small line is proposed.Rough interpolation is made up of two parts： velocity planning and realtime looking-ahead.A uniformly accelerated DDA interpolation algorithm is adopted in fine interpolation.The maximum allowable transition velocity is calculated,and the actual speed is then adujsted in accordance with look-ahead data.Finally the DDA interpolation algorithm is used to output pulse.Each small line is no longer split into smaller micro-lines,but interpolated by fine interpolation device.The results demonstrate that the algorithm has higher actual speed and no theoretical error.