基于FIR滤波的拐角精确插补算法

Accurate Interpolation of Corner Processing Path Based on FIR Filtering

刀具轨迹一般是由一系列直线(G01)或圆弧(G02)组成,为了实现路径之间的平滑转接和精确过渡,课题组提出了基于有限脉冲响应(FIR)的连续拐角精确插补算法。该算法利用FIR滤波器对速度脉冲进行滤波,生成刀具的拐角轨迹,通过调节滤波器重叠时间,精确控制拐角轮廓误差,利用过滤后脉冲生成加速度曲线的频谱,加速度曲线可以避免不必要的残余振动。通过实验与传统点对点(p2p)插补算法进行对比,课题组提出的算法加工时间减少了14. 6%,加工效率明显提高。

Tool path is generally composed of a series of straight lines( G01) or circles( G02). In order to achieve smooth and accurate transitions between path segments,this paper presented an algorithm for corner interpolation based on finite impulse response( FIR). The algorithm adopted FIR filter to filter velocity pulse generating tool angle trajectory,by adjusting the overlap time of the filter,the corner contour error was precisely controlled,and the figure of acceleration curve was generated by the filtered pulse,which avoided unnecessary residual vibration. Compared with the traditional of p2 p interpolation algorithm,the processing time of this algorithm is reduced by 14. 6%,processing efficiency is improved significantly.