Improving contouring accuracy by using generalized cross-coupled control
Improving contouring accuracy by using generalized cross-coupled control
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DOI：
10.1016/j.ijmachtools.2012.07.012
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发表时间：
2012-12
影响因子：
14
通讯作者：
Feng Huo;A. Poo
中科院分区：
文献类型：
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作者：
Feng Huo;A. Poo
交叉耦合控制（CCC）是一种众所周知的方法，用于直接减少轮廓系统上的轮廓误差，而不是减少轴向跟随误差的间接方法。这种方法的改进，可变增益CCC，扩展其适用性从只是线性轮廓的任何轮廓定义的连续可微函数。在本文中，CCC的基本概念是用来开发一个广义的CCC（GCCC）的方法，它可以适用于任何自由形式的轮廓，包括那些只定义了一系列的（x，y）坐标类似的参考输入数控机床。计算机仿真和在一台小型两轴数控机床上的实际实验结果表明，该方法能有效地减小由于机床动力学不匹配而引起的轮廓误差。对于线性，圆形和抛物线轮廓，CCC也可以应用，GCCC实现了相同水平的轮廓误差减少。此外，实验表明，GCCC也实现了类似水平的轮廓误差减少自由形状的轮廓和角点跟踪。无需轮廓功能的知识，GCCC因此最适合应用于CNC机床，其中要生成的轮廓由一系列参考输入轴向位置限定。
Cross-coupled control (CCC) is a well-known approach for directly reducing contour errors on contouring systems instead of the indirect approach of reducing axial following errors. An improvement of this approach, the variable-gain CCC, extends its applicability from just the linear contour to any contour defined by a continuously differentiable function. In this paper, the basic concept underlying CCC is used to develop a generalized CCC (GCCC) approach which can be applied for any free-form contour, including those defined only by a series of (x,y) coordinates similar to the reference inputs to CNC machines. Both computer simulation and actual experimental implementation of GCCC on a small two-axis CNC machine using four contours showed that it can effectively reduce the contour errors resulting from mismatched machine dynamics. For the linear, circular and parabolic contours that CCC can also be applied to, GCCC achieved the same level of contour error reduction. In addition experiments showed that GCCC also achieved similar levels of contour error reductions for free-form contours and for corner tracking. Without the need for a knowledge of the functions of the contours, GCCC is thus most suitable for application to CNC machines in which the contours that are to be generated are defined by a series of reference input axial positions.