参数曲线的自适应实时前瞻插补算法

Adaptive real-time and look-ahead interpolation algorithm for parametric curves

为实现数控加工中进给速度的平滑过渡,减少速度急剧变化时对机床的冲击,提出了一种参数曲线的实时前瞻插补算法。该算法根据加工弓高误差要求自适应地调整进给速度,同时找出速度敏感点。通过把前瞻距离分成两部分的方法,分析速度敏感点,找出最佳的加减速控制点,避免相邻速度敏感点间加减速过程的互相干涉,提早进行加减速控制,防止速度的急剧变化,从而在满足加工精度的同时也满足了机床的加减速性能。通过RT-Linux软数控下的实例,表明该算法能够适应曲线的各种变化,验证了其可行性。

To realize smooth federate and reduce impact on machine tools caused by dramatic velocity changes,a real-time and look-ahead interpolation algorithm for parametric curve was proposed. This method improved the machining accuracy and detected the sensitive points by confining the chord error in a limited range. Through dividing look-ahead distance into two parts,sensitive points were analyzed,a continuous velocity and accelerating profile were found out which reduced the jerk relate problem. This satisfied not only machining accuracy but also acceleration and deceleration performance of machine tools. By example in RT-Linux,it was revealed that the algorithm could adapt to various changes in curves,and the feasibility and precision of the proposed interpolation algorithm were also verified.