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The frequency, amplitude and magnetic field dependent torsional stiffness of a magneto-sensitive rubber bushing
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
2011 (English)In: International Journal of Mechanical Sciences, ISSN 0020-7403, E-ISSN 1879-2162, Vol. 60, no 1, 54-58 p.Article in journal (Refereed) Published
Abstract [en]

A dynamic torsional stiffness model of a magneto-sensitive circular annular rubber bushing is presented where influences of frequency, amplitude and magnetic field dependence are included. This is achieved by employing a newly developed non-linear magneto-sensitive audio frequency constitutive equation in an engineering formula for the torsional stiffness of a rubber bushing. The engineering stiffness formula predicts the frequency and amplitude dependent stiffness in a simple way, based on geometric dimensions and the shear modulus. The shear modulus is provided by the rubber model. The results from these calculations predict and clearly display the possibility of controlling over a large frequency range, through the application of a magnetic field, the magneto-sensitive rubber bushing stiffness.

Place, publisher, year, edition, pages
2011. Vol. 60, no 1, 54-58 p.
Keyword [en]
audio frequency, magneto-sensitive, non-linear, rubber isolator
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-5911DOI: 10.1016/j.ijmecsci.2012.04.006ISI: 000305598400006Scopus ID: 2-s2.0-84861850196OAI: oai:DiVA.org:kth-5911DiVA: diva2:10444
Funder
Swedish Research Council, 621-2002-5643
Note
QC 20120719Available from: 2006-06-01 Created: 2006-06-01 Last updated: 2012-07-19Bibliographically approved
In thesis
1. Magneto-sensitive rubber in the audible frequency range
Open this publication in new window or tab >>Magneto-sensitive rubber in the audible frequency range
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The dynamic behaviour in the audible frequency range of magneto-sensitive (MS) rubber is the focus of this thesis consisting of five papers A-E. Paper A presents results drawn from experiments on samples subjected to different constant shear strains over varying frequencies and magnetic fields. Main features observed are the existence of an amplitude dependence of the shear modulus referred to as the Fletcher-Gent effect for even small displacements, and the appearance of large MS effects. These results are subsequently used in Paper B and C to model two magneto-sensitive rubber isolators, serving to demonstrate how, effectively, by means of MS rubber, these can be readily improved. The first model calculates the transfer stiffness of a torsionally excited isolator, and the second one, the energy flow into the foundation for a bushing inserted between a vibrating mass and an infinite plate. In both examples, notable improvements in isolation are obtainable. Paper D presents a non-linear constitutive model of MS rubber in the audible frequency range. Characteristics inherent to magneto-sensitive rubber within this dynamic regime are defined: magnetic sensitivity, amplitude dependence, elasticity and viscoelasticity. A very good agreement with experimental values is obtained. In Paper E, the magneto-sensitive rubber bushing stiffness for varying degrees of magnetization is predicted by incorporating the non-linear magneto-sensitive audio frequency rubber model developed in Paper D, into an effective engineering formula for the torsional stiffness of a rubber bushing. The results predict, and clearly display, the possibility of controlling over a large range through the application of a magnetic field, the magneto-sensitive rubber bushing stiffness.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006
Series
Trita-AVE, ISSN 1651-7660 ; 2006:37
Keyword
Magneto-sensitivity, Rubber, Audible frequency range, Amplitude dependence, Vibration isolator, Fletcher-Gent effect, Stiffness
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-4024 (URN)91-7178-392-X (ISBN)
Public defence
2006-06-14, F3, F, Lindstedtsvägen 26, KTH, 13:00
Opponent
Supervisors
Note
QC 20100816Available from: 2006-06-01 Created: 2006-06-01 Last updated: 2010-11-24Bibliographically approved

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