Cross-Coupled Adaptive Feedrate Control for Multiaxis Machine Tools

Abstract

Cross-coupled controllers have been proposed for improving contouring accuracy of multiaxis machine tools. However, during cross-coupled motion control, increasing contour feedrate may result in larger contour errors. In order to increase feedrate and hence productivity without sacrificing the contouring performance, this paper presents an adapative feedrate control strategy based on a linear perturbed model. The method effectively closes the feedback loop between the contour error and feedrate. An experimental biaxial control system is constructed to implement the proposed strategy. Both computer simulation and experiments have verified that desired contouring accuracy can be achieved.

Norm optimal Cross-Coupled Iterative Learning Control

“…PMC becomes increasingly important for tracking contoured reference trajectories in multi-axis systems [1]. Contoured trajectories require coordinated positioning between two or more axes.…”

The effectiveness of contouring control and a design for three-dimensional machining

“…Koren proposed a cross-coupling controller (CCC) that has a mechanism to calculate the contour error from the tracking error in each feed drive axis and reduce the contour error [2]. Advanced controllers such as optimal and non-linear controllers have been applied to contouring controller design and their effectiveness has been verified [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. A disadvantage of these contouring controller designs is that both contour and tracking errors in each feed drive axis are used to calculate control inputs, and this may result in the degradation of contour tracking performance.…”

System structure and contour tracking for a hybrid motion platform

“…In the trajectory tracking, Koren [1] first proposed the crosscoupled biaxial control, which has become the state-of-the-art in precision contour tracking [2][3][4][5][6][7]. Chin and Lin [8] enhanced the cross-coupling operation with a velocity precompensation.…”