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Rubber versus steel vibration isolators - The audible frequency contest
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.ORCID iD: 0000-0001-5760-3919
2005 (English)In: KGK Kautschuk Gummi Kunststoffe, ISSN 0948-3276, Vol. 58, no 11, 564-569 p.Article in journal (Refereed) Published
Abstract [en]

The audible frequency axial dynamic stiffness of three vibration isolators plausibly used in the design of a ship main engine suspension system are examined and compared for different static preloads. An indirect measurement method is used to investigate the blocked dynamic transfer stiffness using a specially designed test rig displaying a strong frequency dependence where resonance and antiresonance phenomena appear in the form of troughs and peaks respectively. The significant influence of the preload effects is also assessed for each isolator. Clearly, the rubber isolator presents superior performances in comparison with the two others, steel and combined steel-rubber isolators, over the studied frequency range 200 to 1000 Hz for each preload 30, 40 and 50 kN.

Place, publisher, year, edition, pages
2005. Vol. 58, no 11, 564-569 p.
Keyword [en]
vibration isolator, dynamic stiffness, rubber, steel, audible frequency
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-5289ISI: 000233533200002ScopusID: 2-s2.0-27744541371OAI: diva2:8328

QC 20101001. Uppdaterad från submitted till published (20101001).

Available from: 2005-06-07 Created: 2005-06-07 Last updated: 2014-12-01Bibliographically approved
In thesis
1. Effective vibro-acoustical modelling of rubber isolators
Open this publication in new window or tab >>Effective vibro-acoustical modelling of rubber isolators
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis, gathering four papers, concerns the enhancement in understanding and modelling of the audible dynamic stiffness of vibration rubber isolators including experimental measurements.

Paper A studies the performances of three different types of vibration isolator using an indirect measurement technique to estimate the blocked dynamic transfer stiffness of each specimen. The measurements are performed over a wide audible frequency range of 200 to 1000 Hz in a specially designed test rig enabling the investigation of arbitrary preload influences.

Paper B addresses the modelling of the audible-frequency stiffness of the rubber conical mount experimentally appraised in Paper A accounting for preload effects. The model is based on a simpliflied waveguide approach approximating the nonlinearities attributed to the predeformations by adopting shape factor considerations. The carbon black filled rubber is assumed incompressible, displaying a viscoelastic behavior based on a fractional derivative Kelvin-Voigt model efficiently reducing the number of required material parameters.

In Paper C the focus is on the axial dynamic stiffness modelling of an arbitrary long rubber bushing within the audible frequency range. The problems of simultaneously satisfying the locally non-mixed boundary conditions at the radial and end surfaces are solved by adopting a waveguide approach, using the dispersion relation for axially symmetric waves in thick-walled infinite plates, while fulfilling the radial boundary conditions by mode-matching. The results obtained are successfully compared with simpliflied models but display discrepancies when increasing the diameter-to-length ratios since the influence of higher order modes and dispersion augments.

Paper D develops an effective waveguide model for a pre-compressed cylindrical vibration isolator within the audible frequency domain at arbitrary compressions. The original, mathematically arduous problem of simultaneously modelling the preload and frequency dependence is solved by applying a novel transformation of the pre-strained isolator into a globally equivalent homogeneous and isotropic configuration enabling the straightforward application of a waveguide model to satisfy the boundary conditions. The results obtained present good agreement with the non-linear finite element results for a wide frequency range of 20 to 2000 Hz at different preloads.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 25 p.
Trita-AVE, ISSN 1651-7660 ; 2005:25
Applied mechanics, Rubber isolator, Bush mounting, Dynamic stiffness, Waveguide, Fractional derivatives, Mode-matching, Pre-compressed, Prestrain, Preload, Predeformation, Viscoelasticity, Dispersion, Teknisk mekanik
National Category
Mechanical Engineering
urn:nbn:se:kth:diva-266 (URN)91-7178-104-8 (ISBN)
Public defence
2005-06-16, D3, Lindstedtsvägen 5, Stockholm, 10:00
QC 20101001Available from: 2005-06-07 Created: 2005-06-07 Last updated: 2010-10-01Bibliographically approved

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