Sliding look-ahead window-based real-time feedrate planning for non-uniform rational B-splines curves

Sliding look-ahead window-based real-time feedrate planning for non-uniform rational B-splines curves

Blog Article

This article presents an online three-axis non-uniform rational B-splines preprocessing and feedrate scheduling method with chord error, axial velocity, acceleration, and jerk limitations.A preprocessing method is proposed to accurately locate the critical points by reducing pre-interpolation feedrate in feedrate limit violation regions.In the preprocessing stage, the non-uniform rational B-splines curve is subdivided into segments by the critical points and the corresponding feedrate constraints are obtained.A sliding look-ahead window-based feedrate scheduling method is proposed to generate smooth feedrate profile for the buffered non-uniform rational B-splines Ranch Saddle segments.

The feedrate profile corresponding to each non-uniform rational B-splines block is constructed according to the block length and the given limits of acceleration and jerk.The feedrate modification method for non-schedulable short blocks is also described which aimed at Horse Cooler Rugs avoiding feedrate discontinuity at the junction of two non-uniform rational B-splines blocks.With the proposed method, a successful feedrate profile could be generated with sufficient look-ahead trajectory length in the buffer, which enables that the preprocessing and feedrate planning to be performed progressively online.Simulation and experimental tests with different non-uniform rational B-splines curves are carried out to validate the feasibility and advantages of the proposed method.

The results show that the proposed method is capable of making a balance between the machining efficiency, machining precision, and computational complexity.