基于曲率加权累加的动态速度前瞻控制  

Dynamic velocity look-ahead control based on weighted accumulation of curvature

作　　者：刘振忠[1] 王太勇[1] 任成祖[1] 刘清建[1] 

机构地区：[1]天津大学机械工程学院,天津300072

出　　处：《机械设计》2012年第3期89-92,共4页Journal of Machine Design

基　　金：国家科技重大专项基金资助项目(2009ZX04014-101-05);国家自然科学基金资助项目(50975193)

摘　　要：针对在高速加工、快速检测等高速进给条件下,传统速度控制方法容易导致工件过切、机床抖动等问题,提出了基于离散衔接点曲率加权累加的速度前瞻程序段数动态选择的方法。首先,分析了基于5次样条曲线拟合离散衔接点方法,然后推导了到各衔接点的曲率表达式,最后根据各点曲率加权累加值进行动态速度前瞻程序段控制,并进行了仿真验证。仿真结果表明,动态速度前瞻避免了前瞻路径过短不能完成减速要求和前瞻段数过多占用系统资源,一定程度上解决了速度和精度的冲突问题,提高了系统的性能和加工效率。As the problems of workpiece over-cut and machine chopping easily caused by conventional speed control under high speed feeding conditions as high speed machining and rapid detec- tion, a dynamic selection method of velocity look-ahead block num- ber was proposed based on curvature weighted accumulation of discrete points. First, the fitting of discrete joint point method was an alyzed based on quintic splines. Then, curvature expressions to va- rious discrete joint points were derived. At last, dynamic blocks of look-ahead velocity control were carried out based on curvature weighted accumulation of discrete point, and the simulation verifi- cation was conducted. The simulation resuh shows that the dynamic velocity lookahead can avoid the speed reduction requirement could not complete due to overshort of the look-ahead path and the system resource is occupied due to too much number of lookahead blocks, solving the conflict problem of speed and accuracy at some extent, and improving system performance and processing efficiency.

关 键 词：数控系统 样条曲线 速度前瞻 曲率 

分 类 号：TG659[金属学及工艺—金属切削加工及机床] TP273[自动化与计算机技术—检测技术与自动化装置]