Static Calibration and Compensation of the Tau Parallel Kinematic Robot Using a Single 6-DOF Laser Tracker 2011-01-2653
Parallel kinematic mechanisms (PKMs) offer advantages of high stiffness to mass ratios, greater potential for accuracy and repeatability, and lower cost when compared to traditional assembly machines. Because of this, there is a strong interest in using PKMs for aerospace assembly and joining operations. This paper looks at the calibration of a prototype Gantry TAU robot by extending the higher-order implicit loop calibration techniques developed for serial link mechanisms to parallel link mechanisms. The kinematic model is based on the geometric model proposed by Dressler et al., augmented with a cubic spline error model of the motion errors for each of the three translation actuators resulting in 185 parameters. Measurements are taken with a 6-DOF laser tracker, and the kinematic parameters are solved as the maximum likelihood parameter estimate. Accuracy after calibration is shown to be as effective as calibration done by collecting the motion errors of the actuators and TCP separately (median static positioning error of 97 μm), but with a much simpler and faster calibration procedure requiring only a single setup and one set of measurements.
Citation: Freeman, P., Crothers, P., and Leptos, M., "Static Calibration and Compensation of the Tau Parallel Kinematic Robot Using a Single 6-DOF Laser Tracker," SAE Technical Paper 2011-01-2653, 2011, https://doi.org/10.4271/2011-01-2653. Download Citation
Author(s):
Philip Freeman, Phil Crothers, Michael Leptos
Affiliated:
Boeing Co., Boeing Research & Technology, Boeing Aerstructures Australia
Pages: 8
Event:
Aerospace Technology Conference and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Calibration
Assembling
Robotics
Kinematics
Joining
Sensors and actuators
Lasers
Splines
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