System and method for improving the dynamic accuracy of a...

B - Operations – Transporting – 25 – J

Patent

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B25J 9/16 (2006.01)

Patent

CA 2312739

A system and method for improving the dynamic accuracy of a positioning device, such as a hexapod machining center, is disclosed. The positioning device has an upper and lower platform connected by a plurality of actuators at a plurality of pivot locations. The dynamic accuracy of the positioning device is improved by reducing undesired following errors in the actuator servo system. The improved method comprises the steps of: calculating, in real time, desired actuator forces required to produce an acceleration for the positioning device which minimizes the undesired following errors in the actuator servo system; and continuously commanding the actuators to produce the calculated actuator forces.

La présente invention concerne un système et un procédé permettant d'améliorer l'exactitude dynamique d'un dispositif de positionnement tel qu'un centre d'usinage hexapode. Le dispositif de positionnement comprend une plate-forme supérieure et une plate-forme inférieure reliées entre elles par plusieurs actionneurs situés en différents emplacements pivots. On améliore l'exactitude dynamique du dispositif de positionnement en réduisant les erreurs accidentelles qui se suivent dans le système asservi de l'actionneur. Le procédé amélioré consiste à calculer en temps réel les forces d'actionneur requises pour produire une accélération du dispositif de positionnement minimisant les erreurs accidentelles qui se suivent dans le système asservi de l'actionneur, et à commander les actionneurs en continu de façon qu'ils produisent les forces d'actionneur calculées.

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