This paper describes a study of the performance of a servodriven dry-friction damper employed in a vehicle suspension application. The damper is force-controlled via an electrohydraulic pressure control system. Previous experimental work showed that the theoretically predicted system performance does not reflect actual system behaviour because of both the residual back-pressure which produces an undesired constant-amplitude damping force and reduced hydraulic system bandwidth due to presence of free air within the hydraulic fluid. Possible solutions are proposed and performance assessed against a simulated system with dynamic performance purposely worsened. The first issue can be addressed by spring-preloading the friction damper so as to compensate the constant force caused by the residual back-pressure. The second issue can be tackled by closing a local pressure control loop around the control valve. The friction damper is controlled by a variable structure scheme that performs spring force compensation tracking. Bond graphs are employed as a tool for modelling and designing the control system.


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    Title :

    Performance enhancement of a friction damper system using bond graphs


    Additional title:

    Erhöhung der Leistung eines Trockenreibdämpfersystems mit Hilfe von Bondgraphenmodellen


    Contributors:


    Publication date :

    2004


    Size :

    9 Seiten, 12 Bilder, 2 Tabellen, 7 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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