An inexpensive method for kinematic calibration of a parallel robot by using one hand-held camera as main sensor.
This paper presents a novel method for the calibration of a parallel robot, which allows a more accurate configuration instead of a configuration based on nominal parameters. It is used, as the main sensor with one camera installed in the robot hand that determines the relative position of the robot with respect to a spherical object fixed in the working area of the robot. The positions of the end effector are related to the incremental positions of resolvers of the robot motors. A kinematic model of the robot is used to find a new group of parameters, which minimizes errors in the kinematic equations. Additionally, properties of the spherical object and intrinsic camera parameters are utilized to model the projection of the object in the image and thereby improve spatial measurements. Finally, several working tests, static and tracking tests are executed in order to verify how the robotic system behaviour improves by using calibrated parameters against nominal parameters. In order to emphasize that, this proposed new method uses neither external nor expensive sensor. That is why new robots are useful in teaching and research activities.
Postgrado, Universidad Aeronáutica de Querétaro, Tequisquiapan 22154, 76270 Colón, Mexico. altrami@hotmail.com
Alberto
A
Traslosheros
José María
JM
Sebastián
Jesús
J
Torrijos
Ricardo
R
Carelli
Eduardo
E
Castillo
D000465:Algorithms; D002138:Calibration; D003198:Computer Simulation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008904:Miniaturization; D008962:Models, Theoretical; D009038:Motion; D010781:Photography / Q000295:instrumentation*; D012371:Robotics / Q000295:instrumentation*; D014159:Transducers