Coordinate Measuring Machine using Parallel Mechanism. (5th Report). Kinematic Calibration with Three-Dimensional Ball Plate.
Coordinate Measuring Machine using Parallel Mechanism. (5th Report). Kinematic Calibration with Three-Dimensional Ball Plate.
复制标题
使用并联机构的坐标测量机。
DOI：
10.2493/jjspe.68.65
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发表时间：
2002
影响因子：
--
通讯作者：
Kohki Yamaguchi
中科院分区：
文献类型：
--
作者：
T. Oiwa;Masato Kyogoku;Kohki Yamaguchi
本研究提出了一种基于三自由度并联运动学的新型坐标测量机（CMM）。本文提出了一种使用由精确的传统坐标测量机预先校准的三维球板的运动学校准方法。 The least square method using Jacobian matrix estimates the kinematic parameters so that the ball position errors obtained by measuring the ball plate are minimized.上述计算已在数值模拟和实验中重复进行。实验中估计参数数量的增加使球板的位置误差从180μm减小到6μm。 Furthermore, accuracies of both length measurement with block gauges and profile measurement with an optical flat have been improved significantly after the calibration.当重复操作在三次计算后停止时，测量精度得到最大程度的提高。球板的球必须广泛地位于三维空间中。
This study proposes a new coordinate measuring machine (CMM) based on a three-degree-of-freedom parallel kinematics. This paper presents a kinematic calibration method using three-dimensional ball plate calibrated beforehand by accurate conventional CMMs. The least square method using Jacobian matrix estimates the kinematic parameters so that the ball position errors obtained by measuring the ball plate are minimized. The above calculation has been repeated in both numerical simulations and experiments. An increase of the number of estimating parameters has decreased the position error of the ball plate from 180 μm to 6μm in the experiments. Furthermore, accuracies of both length measurement with block gauges and profile measurement with an optical flat have been improved significantly after the calibration. The measurement accuracy most improves when the repetitive operation is discontinued after three calculations. The balls of the ball plate must be extensively located in a three dimensional space.