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  • Passive Damping Augmentation for Vibration Suppression in Flexible Latticed Beam-Like Space Structures

    Article thumbnail: Passive Damping Augmentation for Vibration Suppression in Flexible Latticed Beam-Like Space Structures
    Type:
    Article
    Description/Abstract:
    For a Timoshenko beam model the equations of motion, representing the anisotropic continuum model of a two-dimensional, latticed, large space structure, are extended to include coupling between the extensional, shear and bending modes. This analytical model, applied to a 20-bay, orthogonal, tetrahedral, cantilevered truss structure, is used to determine the transient response when subjected to a unit impulse. It is demonstrated that for beam-like structures having a fixed bending stiffness and beam mass an increase in diagonal stiffness, on account of the stiffness of the vertical girder, leads to a rise in the transverse shear rigidity. This results in higher natural frequencies and a reduction in peak displacement. In addition, in an asymmetrical truss configuration, coupling between the extensional and shear modes raises the maximum peak displacement compared to that obtained for a symmetric truss. The model is modified to investigate the introduction of passive damping in the form of several dynamic vibration absorbers. For a fixed absorber mass budget, a simple yet efficient absorber parameter optimization procedure, based on the classical steady state criteria of a 2-DOF system, is developed to design several absorbers each tuned to a different modal frequency. It is found that inclusion of transverse shear rigidity, as a design parameter in damping augmentation studies, reduces settling time for predetermined maximum peak displacements.
    Creator/Author:
    Weller, T. and Cohen, Kelly
    Submitter:
    Kelly Cohen
    Date Uploaded:
    02/08/2017
    Date Modified:
    04/05/2017
    Date Created:
    1994-08
    License:
    All rights reserved