Substructure decoupling consists in the identification of a dynamic model of a structural subsystem, starting from a dynamic model (e.g. FRFs) of both the assembled system and a known portion of it (the so-called residual subsystem). The degrees of freedom (DoFs) of the assembled system can be subdivided into internal DoFs (not belonging to the couplings) and coupling DoFs. To achieve decoupling, a fictitious subsystem that is the negative of the residual subsystem is added to the assembled system, and appropriate compatibility and equilibrium conditions are enforced at interface DoFs. Interface DoFs can include coupling DoFs only (standard interface), additional internal DoFs of the residual subsystem (extended interface), subsets of coupling DoFs and internal DoFs of the residual subsystem (mixed interface), or a subset of internal DoFs of the residual subsystem only (pseudo interface). In previous papers, the use of a mixed interface is applied in order to get rid of hard-to-measure coupling DoFs, such as for instance rotational DoFs at junctions involving bending and/or torsion. In this paper, criteria are sought for an appropriate selection of internal DoFs used to replace coupling DoFs at which it is hard to obtain experimental FRFs.

Selection of internal DoFs to replace hard to measure coupling dofs in substructure decoupling

D'AMBROGIO, WALTER;
2015-01-01

Abstract

Substructure decoupling consists in the identification of a dynamic model of a structural subsystem, starting from a dynamic model (e.g. FRFs) of both the assembled system and a known portion of it (the so-called residual subsystem). The degrees of freedom (DoFs) of the assembled system can be subdivided into internal DoFs (not belonging to the couplings) and coupling DoFs. To achieve decoupling, a fictitious subsystem that is the negative of the residual subsystem is added to the assembled system, and appropriate compatibility and equilibrium conditions are enforced at interface DoFs. Interface DoFs can include coupling DoFs only (standard interface), additional internal DoFs of the residual subsystem (extended interface), subsets of coupling DoFs and internal DoFs of the residual subsystem (mixed interface), or a subset of internal DoFs of the residual subsystem only (pseudo interface). In previous papers, the use of a mixed interface is applied in order to get rid of hard-to-measure coupling DoFs, such as for instance rotational DoFs at junctions involving bending and/or torsion. In this paper, criteria are sought for an appropriate selection of internal DoFs used to replace coupling DoFs at which it is hard to obtain experimental FRFs.
2015
978-961-6536-97-4
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11697/41650
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