Kinematic calibration of a Stewart platform using pose measurements obtained by a single theodolite
- 19 November 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 2, 329-334
- https://doi.org/10.1109/iros.1995.526237
Abstract
This paper focuses on the accuracy enhancement of Stewart platforms through kinematic calibration. The calibration problem is formulated in terms of a measurement residual, which is the discrepancy between the measured leg length and the computed leg length. With this formulation, one is able to identify kinematic error parameters of the Stewart platform without the necessity of solving the forward kinematic problem, thus avoiding the numerical problems associated with the solution of the forward kinematic problem. The error parameters are basically the installation errors of the platform ball and U-joints as well as the leg length offsets. By this formulation, a concise differential error model with a well-structured identification Jacobian, which relates the pose measurement residual to the errors in the parameters of the platform, is derived. A measurement procedure that utilizes a single theodolite was devised to determine the poses of the platform. Experimental studies reveal that the proposed calibration method is effective in enhancing the accuracy performance of Stewart platforms.Keywords
This publication has 4 references indexed in Scilit:
- Kinematic calibration of manipulators with closed loop actuated jointsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Closed-loop kinematic calibration of the RSI 6-DOF hand controllerPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Method for kinematic calibration of stewart platformsJournal of Robotic Systems, 1993
- Unbiased estimation and statistical analysis of 3-D rigid motion from two viewsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1993