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A Modal Synthesis Method Based on Analytical Eigensolutions of the Substructures with Condensation of Modal Degrees of Freedom.

Irretier, H. (1) and Sinapius, M. (1990) A Modal Synthesis Method Based on Analytical Eigensolutions of the Substructures with Condensation of Modal Degrees of Freedom. In: Preprint of Conference Contributions, Vol. 1 ; Proceedings, Vol. 2., pp. 1007-1014. EURODYN '90, 5-7 June 1990, Bochum, organized by SFB 151, Ruhr-Universitaet Bochum..

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Abstract

A modal method for the calculation of natural frequencies and mode shapes of large linear structures is presented. In order to reduce the number of modal degrees of freedom, the influence of the higher-order substructure modes is estimated by static and dynamic condensation to master model degrees of freedom. Analytical substructure eigensolutions are used which yield a reduced eigenvalue problem of the structure without any structure or substructure discretization. The method is applied to a frame structure of slender, straight beams with a lumped mass. The results are compared with finite element solutions and experimental studies. The influence of the number of substructure modes used in the modal synthesis procedure on the accuracy of the approximated structure natural frequencies is discussed.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1990, pages=8,
Title:A Modal Synthesis Method Based on Analytical Eigensolutions of the Substructures with Condensation of Modal Degrees of Freedom.
Authors:
AuthorsInstitution or Email of Authors
Irretier, H. (1)UNSPECIFIED
Sinapius, M.UNSPECIFIED
Date:1990
Journal or Publication Title:Preprint of Conference Contributions, Vol. 1 ; Proceedings, Vol. 2.
Page Range:pp. 1007-1014
Status:Published
Keywords:Modal Synthesis, Residual Flexibility Matrix, Static Condensation, Dy namic Condensation, Eigensolutions
Event Title:EURODYN '90, 5-7 June 1990, Bochum, organized by SFB 151, Ruhr-Universitaet Bochum.
HGF - Research field:UNSPECIFIED
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:no assignment
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: elib DLR-Beauftragter
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 10:41

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