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Exploring the vibration control potential of magneto-sensitive rubber
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
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 [en]
Applied mechanics, magneto-sensitive rubber
Keyword [sv]
Teknisk mekanik
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-241OAI: oai:DiVA.org:kth-241DiVA: diva2:8039
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
List of papers
1. Amplitude and frequency dependence of magneto-sensitive rubber in a wide frequency range
Open this publication in new window or tab >>Amplitude and frequency dependence of magneto-sensitive rubber in a wide frequency range
2005 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 24, no 5, 656-662 p.Article in journal (Refereed) Published
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. In order to illustrate these two features, results are presented of measurements performed in the audible frequency range on two different kinds of rubber: silicone and natural rubber with a respective iron particle volume concentration of 33%. The particles used are of irregular shape and randomly distributed within the rubber. An external magnetic field of 0-0.8 T is applied. Both kinds of rubber are found to be strongly amplitude dependent and, furthermore, displaying large responses to externally applied magnetic fields - a maximum of 115%. Also included are graphs of measurements on silicone and natural rubber devoid of iron particles. Those results support the conclusion that introducing iron particles in the rubber gives rise to a strong, non-negligible, amplitude dependence in the entire frequency range.

Place, publisher, year, edition, pages
Elsevier, 2005
Keyword
magneto-sensitivity, Fletcher-Gent effect, rubber, amplitude dependence, audible frequency range
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-5907 (URN)10.1016/j.polymertesting.2005.04.001 (DOI)000229979000018 ()2-s2.0-19144365921 (Scopus ID)
Note

QC 20100816

QC 20151208

Available from: 2006-06-01 Created: 2006-06-01 Last updated: 2015-12-09Bibliographically approved
2. Magneto-sensitive rubber in a noise reduction context: exploring the potential
Open this publication in new window or tab >>Magneto-sensitive rubber in a noise reduction context: exploring the potential
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.

Keyword
magneto-sensitive rubber, noise, audible frequency range, magnetorheological elastomers, dependence
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-15244 (URN)10.1179/174328905x59692 (DOI)000233871700005 ()2-s2.0-28744444327 (Scopus ID)
Note

QC 20150721

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
3. Smart audio frequency energy flow control by magneto-sensitive rubber isolators
Open this publication in new window or tab >>Smart audio frequency energy flow control by magneto-sensitive rubber isolators
2008 (English)In: Smart materials and structures (Print), ISSN 0964-1726, E-ISSN 1361-665X, Vol. 17, no 1Article in journal (Refereed) Published
Abstract [en]

A magneto-sensitive rubber isolator inserted between a source and an infinite plate is modelled in the audible frequency range, and the energy flow into the plate with the rubber subjected to a magnetic field applied perpendicular to the axial displacement is calculated. Subsequently the result is compared to the corresponding energy flow for zero magnetic induction; upon the application of an external magnetic field the rubber becomes stiffer, thus shifting the internal resonances of the isolator. This is a fast and reversible process enabling adaption of the isolator to rapidly changing audio frequency conditions by simply turning on and off a magnetic field. In the application example considered, the energy flow into the plate at the first internal dynamic peak stiffness frequency is reduced by approximately 7 dB-a large difference in a sound and vibration context-by inducing magnetic saturation of the rubber.

Keyword
magnetorheological elastomers, dependence
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-5909 (URN)10.1088/0964-1726/17/1/015043 (DOI)000254176200044 ()2-s2.0-41849110916 (Scopus ID)
Note

Uppdaterad från submitted till published. QC 20100816

QC 20150728

Available from: 2006-06-01 Created: 2006-06-01 Last updated: 2015-07-28Bibliographically approved

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