Model-based control of an active fixture for advanced aerospace components

O. J. Bakker, A. A. Popov, E. Salvi, A. Merlo, S. M. Ratchev

    Research output: Contribution to journalArticlepeer-review


    In this paper the dynamical behaviour of a flexible part and an actively controlled fixture system is studied. Four active clamps are used for the control of the part-fixture system. Advanced finite element (FE) analyses have been carried out to model the part and the adaptive clamps. An accurate small-sized model of the part is established using the Craig-Bampton reduction method. A second-order model has been established for the adaptive clamps on the basis of the FE model. The supports and part-fixture contacts are modelled as spring-dashpot elements. Piezoelectric actuators are utilized to provide the forces required for the adaptive clamping scheme. A model-based control architecture has been incorporated and proportional-integral (PI) controllers are established for the individual clamps. After investigating the performance of the controllers for dynamic compensation, analysis shows that PI control can be used effectively to minimize the reaction forces on the supports, induced by deflection caused by machining forces.

    Original languageEnglish
    Pages (from-to)35-51
    Number of pages17
    JournalProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
    Issue number1
    Publication statusPublished - 1 Jan 2011


    • active fixtures
    • dynamics modelling
    • fixture control
    • fixturing technology
    • model reduction


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