关键词: 非均匀有理B样条, S加减速, 曲率, 开放式控制器, 机床

Abstract: To reduce mechanical impact on machines during transition between NURBS segments, a flexible acceleration and deceleration control method based on curvature properties was presented. A trapezoidal NURBS acceleration and deceleration method was studied which satisfied interpolation error requirements. At the same time, a simplified algorithm met S type deceleration demands was deduced. The simulation experiments included the above two algorithms based on chord error showed that both acceleration and jerk appeared breaks during the curvature greatly changed. These were caused greater impact for machine tools. However, the simulation experiment based on the presented algorithm showed that the relative characteristic parameters were complied with the planning demands of acceleration and deceleration. The presented algorithms were integrated into the open controller developed by ourselves, and the machining experiment showed numerical control machine was run more smoothly with proposed algorithm, and had an excellent real-time performance.

Key words: non-uniform rational B-splines, S-shape acceleration and deceleration, curvature, open architecture controller, machine tools