Damping of vibrations of hollow beams using viscoelastic spheres

S. Olutunde Oyadiji

doi:10.1117/12.239078

1 May 1996 Damping of vibrations of hollow beams using viscoelastic spheres

S. Olutunde Oyadiji

Proceedings Volume 2720, Smart Structures and Materials 1996: Passive Damping and Isolation; (1996) https://doi.org/10.1117/12.239078
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

Abstract

The use of viscoelastic spheres for damping the vibrations of square-section and rectangular- section hollow steel beams is presented. The transfer inertance frequency response functions of the beams in their vertical and horizontal orientations were measured under free-free boundary conditions. These frequency response characteristics were also measured when the beams were empty and when they were filled with low density viscoelastic spheres of 9 mm, 15 mm and 18 mm diameters. Using a nonlinear least squares curve fitting approach in conjunction with the modal analysis technique, the modal frequencies and the modal loss factors of the composite viscoelastic sphere-filled beams were determined from the measured transfer inertance frequency response functions. It is shown that the modal loss factors of the hollow steel beams when empty were in the range of 0.2% to 1.0%, whereas the modal loss factors of the hollow steel beams when filled with the viscoelastic spheres were in the range 2% to 31%. Thus, it is concluded that the modal loss factors of the hollow beams could be increased up to 40 times by filling them with the viscoelastic spheres.

Citation Download Citation

S. Olutunde Oyadiji "Damping of vibrations of hollow beams using viscoelastic spheres", Proc. SPIE 2720, Smart Structures and Materials 1996: Passive Damping and Isolation, (1 May 1996); https://doi.org/10.1117/12.239078

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