Optimal workplacement for robotic friction stir welding task
TypeCommunications avec actes
Robotic manipulators are widely used in industry for welding processes. Inadequate joint stiffness in the manipulators often limits their use for high quality welding operations because of the deformation errors produced during the process. As a matter of fact, welding quality deteriorates with decreasing joint stiffness. This paper presents an approach to determine an optimal workspace of operation by minimizing the lateral deflection errors in position and orientation of the end effector during Friction Stir Welding. This has been done by estimating the errors in position and orientation of the end effector, also the point of contact with work piece which directly affects welding quality, when it experiences a wrench during welding operation. The technique was applied to an elastodynamic model of a 6 DOF manipulator with different path constraints for welding process to achieve optimal task placement. In a nutshell, optimal starting position or an optimal direction of motion for best welding quality can be precisely computed or even both together can be calculated but with numerical complexity.
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KLIMCHIK, Alexandr; PASHKEVICH, Anatol; GARNIER, Sébastien; CARO, Stéphane; LEONARD, François; ABBA, Gabriel; QIN, Jinna (ABBA Gabriel, 2014)The objective of this report is to detail the models used in simulation and the results obtained in simulation for both machining and FSW process. This report contains in a first part the details of modeling flexibilities ...
QIN, Jinna; LEONARD, François; ABBA, Gabriel (Elsevier/International Federation of Automatic Control, 2014)This paper demonstrates the solutions of digital observer implementation for industrial applications. A nonlinear high-gain discrete observer is proposed to compensate the tracking error due to the flexibility of robot ...
Experimental External Force Estimation Using a Non-Linear Observer for 6 axes Flexible-Joint Industrial Manipulators QIN, Jinna; LEONARD, François; ABBA, Gabriel (the Institute of Electrical and Electronics Engineers, 2013)This paper proposes a non-linear observer to estimate not only the state (position and velocity) of links but also the external forces exerted by the robot during Friction Stir Welding (FSW) processes. The difficulty of ...
GAUTIER, Maxime; JUBIEN, Anthony; ABBA, Gabriel; QIN, Jinna (ENSAM, 2013)Ce rapport est décomposé en 8 parties. La seconde partie rappelle les bases de la modélisation des robots à architecture série et présente les modélisations des deux robots. La troisième présente les méthodes d'identification ...
QIN, Jinna; LEONARD, François; ABBA, Gabriel (ASME, 2012)This paper proposes to use a non-linear observer to build the state and the external force of flexible manipulator robots during their machining (composite materials) processes or Friction Stir Welding (FSW) processes. ...