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Kinematic Accuracy and Self-Calibration of an Object Integrative Handling System

ISBN: 978-3-86359-631-6

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Kurzübersicht

The cooperative manipulation of objects with industrial robots often results in inadequate object positioning due to inaccurate grasp points. Today’s control and calibration approaches, do not target the identification of these uncertain grasp points. In this thesis, a kinematic calibration procedure and a self-calibration procedure for the object integrative handling were developed and validated. This extends the capabilities of cooperating robots regarding reconfiguration and calibration.

Kinematic Accuracy and Self-Calibration of an Object Integrative Handling System

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The cooperative manipulation of rigid objects with industrial robots is a challenging configuration for the control. The object is connected to multiple robots and integrated into the kinematic structure, resulting in actuation redundancy. Inaccuracies of the robots and tolerances of the object lead to deviations of the grasp points at the object, that are amplified due to coupling effects. This consequently results in inadequate object positioning and causes internal tensioning of the overall structure. A recent example of this object integration is the PARAGRIP handling system that was investigated in this thesis.
Today’s control and calibration approaches, however, do not target the identification of the uncertain grasp points. Accordingly, in this thesis a kinematic calibration procedure for the PARAGRIP robotic arms and a self-calibration procedure for the object integrative handling system were developed to identify the actual grasp points at the object.
The kinematic calibration was investigated for a mathematically efficient serial and a hybrid kinematics model, both including the compensation of gravitational effects. The limited absolute accuracy of the PARAGRIP arms could be improved significantly.
In the context of the kinematic calibration, a new stiffness modeling approach was implemented by extending the concept of Matrix Structure Analysis. The implemented modeling approach allows for the automatic calculation of arbitrary kinematic structures and the compensation of the gravitational deformations.
Furthermore, a new self-calibration method for the object integrative handling system was developed based on the combination of direct and inverse kinematic calculations. The redundant sensor-information of the cooperating robots is evaluated to identify the actual grasp points at the integrated object.
The results show that the available redundant sensor information for object integrative robots or handling systems can be used to identify the grasp points at the object and compensate the internal inaccuracies automatically. This offers the opportunity to extend the capabilities of cooperating robots and allows for the reconfiguration and calibration without additional external metrology. The research and results described in this thesis yielded new findings for the PARAGRIP handling system, which can be generalized for every object integrative handling system with redundant actuation, in particular cooperating industrial robots.

Zusatzinformation

Autor Detert, Tim
ISBN/Artikelnr. 978-3-86359-631-6
Gewicht 0.224 kg
Erscheinungsdatum 22.06.2018
Lieferzeit 3-4 Tage
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