Measurement Principle Analysis and CAA Technology of the Intelligent Articulated CMM

作者：Lin Shen Wang; Chen Cha'o Kuang

来源：Journal of the Chinese Society of Mechanical Engineers, 2009, 30(1): 53-58.

• articulated arm coordinat measuring machine
• non-orthogonal
• error correction
• parameters identification

The mechanical structure and principle of a kind of articulated arm CMM with 6 DOF is introduced. The measurement equation is deduced, and the architecture design, which makes the measurement space as large as possible and reduce the number of unreachable areas. At the same time, the design of arms is optimized. CAA is used in the application to improve its accuracy. First the least squares method is applied to amend circular grating measurement errors and to improve the angle measurement accuracy. Subsequently a calibration method based spatial distance between two points is proposed. With the laser tracker form API as a benchmark, the method employs the nonlinear least-squares Gauss-Newton method to identify the parameters of the machine. The experimental results show, that Error Correction Technology can effectively improve the overall precision of the articulation-type CMM.

• 出版日期2009-2