摘要
CNC系统中参数曲线插补广泛地应用于复杂轨迹的生成.为了弥补参数曲线插补时加减速能力的不足,提出自适应的加减速控制方法.在插补预处理中,对轮廓误差引起的速度变化曲线进行分析,在加加速度满足要求的同时,对加速度的变化进行控制.应用该方法,在保证系统加工精度的基础上,可以根据曲线的形状,自适应的调整进给速度,使进给速度变化趋于平滑,有效地避免了加速度和加加速度的变化对伺服系统造成的机械冲击.文中给出了B样条曲线插补的实例对控制方法进行了说明和验证.仿真结果表明,该方法切实可行而且有效.
Parametric curve interpolators have become widely adopted in complex trajectory generation in CNC systems. To improve the acceleration-deceleration capabilities of the parametric curve interpolator, an adaptive acceleration-deceleration control method is presented. In the interpolation preprocessing, the velocity profile is analyzed, where the feedrates are varied due to the contour errors, and the accelerations and decelerations are controlled with the consideration of the limited jerk. With the proposed approach, the machining accuracy is guaranteed, and the feedrate is adaptively adjusted and smoothed according to the curve shape, based on which the mechanical shock imposed on the servo system by the variation of accelerations and jerks is efficiently avoided. An example of a B-spline curve interpolation has been provided to demonstrate and verify the control method. The simulation result shows that the control method is feasible and efficient.
出处
《小型微型计算机系统》
CSCD
北大核心
2008年第4期769-772,共4页
Journal of Chinese Computer Systems
基金
江苏省自然科学基金项目(BK2003005)资助
关键词
参数曲线插补
自适应加减速
加加速度限制
数控系统
parametric curve interpolator
adaptive acceleration and deceleration
limited jerk
numerical control system
