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Magneto-sensitive rubber in a noise reduction context: exploring the potential
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.ORCID iD: 0000-0001-5760-3919
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
2005 (English)In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 34, no 8, 365-371 p.Article in journal (Refereed) Published
Abstract [en]

In a noise reduction context, magneto-sensitive (MS) rubber is likely to become a. reality in the very near future. This conclusion is reached from the following: a review of the rapidly growing literature on the subject, a discussion around experimentally obtained data on magneto-sensitive rubber, and finally a computer simulation of a MS rubber isolator which seeks to illustrate the utility and great potential of this smart material within the audible frequency range. In contrast to normal rubber, magneto-sensitive rubber contains small iron particles that respond to externally applied magnetic fields, consequently altering the mechanical properties of the rubber. This response increases for small strains strengthening further the link to structure-borne sound applications where displacement amplitudes are usually small; this is borne out by vibration measurements in a running car engine, included for the purpose of placing experimental data on MS rubber in a real context.

Place, publisher, year, edition, pages
2005. Vol. 34, no 8, 365-371 p.
Keyword [en]
magneto-sensitive rubber, noise, audible frequency range, magnetorheological elastomers, dependence
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-15244DOI: 10.1179/174328905x59692ISI: 000233871700005Scopus ID: 2-s2.0-28744444327OAI: oai:DiVA.org:kth-15244DiVA: diva2:333285
Note

QC 20150721

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically 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
2. Exploring the vibration control potential of magneto-sensitive rubber
Open this publication in new window or tab >>Exploring the vibration control potential of magneto-sensitive rubber
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Two new aspects of the dynamic behaviour in the audible frequency range of magneto-sensitive (MS) rubber are highlighted: 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 have been obtained experimentally and are subsequently used to model two examples of magneto-sensitive rubber isolators to show how by means of MS rubber they can be 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 can be obtained

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 23 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2005:18
Keyword
Applied mechanics, magneto-sensitive rubber, Teknisk mekanik
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-241 (URN)
Presentation
2005-05-26, MWL 74, Farkost o Flyg, Teknikringen 8c, Stockholm, 18:00
Opponent
Supervisors
Note
QC 20101125Available from: 2005-05-31 Created: 2005-05-31 Last updated: 2010-11-25Bibliographically approved

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