A parametric curve look-ahead acceleration and deceleration was planed by the look-ahead algorithm with S shape method. Meanwile, at areas of the curvature radius changing frequently, the trigonometric function acceleration and deceleration method was used. By the fexible acceleration and deceleration method, the impact on the machine is greatly reduced and the computation is also reduced.At the curvature radius changing section, the look-ahead distance was self-decided according to curvature radius. The experimental results verify the feasibility and precision of the proposed interpolation algorithm.

针对参数曲线插补的特点,使用S形加减速和三角函数加减速相结合的柔性加减速方法对参数曲线的插补路径进行前瞻控制。在规划前瞻速度过程中,首先根据加工曲线的曲率变化自适应地将前瞻距离分为曲率上升段和曲率下降段。在对前瞻路径进行S形加减速规划时,遇到路径上曲率频繁变化段,为了减小计算量,采用三角函数加减速的方法对速度进行重新规划。这样,在满足机床加减速要求的同时降低了系统计算负荷。仿真结果和实例表明,该算法能够适应复杂曲线的变化,满足高速高精度插补的要求。 

参数曲线, 柔性加减速, 前瞻控制, 数控

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