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Smart audio frequency energy flow control by magneto-sensitive rubber isolators
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Strukturakustik.
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Strukturakustik.ORCID-id: 0000-0001-5760-3919
2008 (engelsk)Inngår i: Smart materials and structures (Print), ISSN 0964-1726, E-ISSN 1361-665X, Vol. 17, nr 1Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2008. Vol. 17, nr 1
Emneord [en]
magnetorheological elastomers, dependence
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-5909DOI: 10.1088/0964-1726/17/1/015043ISI: 000254176200044Scopus ID: 2-s2.0-41849110916OAI: oai:DiVA.org:kth-5909DiVA, id: diva2:10442
Merknad

Uppdaterad från submitted till published. QC 20100816

QC 20150728

Tilgjengelig fra: 2006-06-01 Laget: 2006-06-01 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Inngår i avhandling
1. Magneto-sensitive rubber in the audible frequency range
Åpne denne publikasjonen i ny fane eller vindu >>Magneto-sensitive rubber in the audible frequency range
2006 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2006
Serie
Trita-AVE, ISSN 1651-7660 ; 2006:37
Emneord
Magneto-sensitivity, Rubber, Audible frequency range, Amplitude dependence, Vibration isolator, Fletcher-Gent effect, Stiffness
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4024 (URN)91-7178-392-X (ISBN)
Disputas
2006-06-14, F3, F, Lindstedtsvägen 26, KTH, 13:00
Opponent
Veileder
Merknad
QC 20100816Tilgjengelig fra: 2006-06-01 Laget: 2006-06-01 Sist oppdatert: 2010-11-24bibliografisk kontrollert
2. Exploring the vibration control potential of magneto-sensitive rubber
Åpne denne publikasjonen i ny fane eller vindu >>Exploring the vibration control potential of magneto-sensitive rubber
2005 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
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

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2005. s. 23
Serie
Trita-AVE, ISSN 1651-7660 ; 2005:18
Emneord
Applied mechanics, magneto-sensitive rubber, Teknisk mekanik
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-241 (URN)
Presentation
2005-05-26, MWL 74, Farkost o Flyg, Teknikringen 8c, Stockholm, 18:00
Opponent
Veileder
Merknad
QC 20101125Tilgjengelig fra: 2005-05-31 Laget: 2005-05-31 Sist oppdatert: 2010-11-25bibliografisk kontrollert

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