Trends in acoustic properties of iron particle seeded auxetic polyurethane foam

Abstract The sound absorption characteristic of a clean, open-cell configuration, typical polyurethane flexible foam is shown against that of an auxetic foam made from it, and this same foam after it has been seeded with a magnetorheological fluid (then dried), having 2–5 μm carbonyl iron particles...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part C, Journal of mechanical engineering science Journal of mechanical engineering science, 2004-02, Vol.218 (2), p.241-244
Main Authors: Scarpa, F, Bullough, W A, Lumley, P
Format: Article
Language:English
Subjects:
Absorptivity
Acoustic absorption
Acoustic impedance
Acoustic properties
Acoustics
Bandwidths
Carbonyls
Fluid dynamics
Iron
Magnetic fields
Magnetism
Magnetorheological fluids
Plastic foams
Polyurethane foam
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Summary:Abstract The sound absorption characteristic of a clean, open-cell configuration, typical polyurethane flexible foam is shown against that of an auxetic foam made from it, and this same foam after it has been seeded with a magnetorheological fluid (then dried), having 2–5 μm carbonyl iron particles and subjected to zero, weak and concentrated magnetic fields in an acoustic impedance tube facility. The resultant foam indicates the capability of shifting the peak acoustic absorption coefficient within a given frequency bandwidth when constant intensity magnetic fields are applied.
ISSN:0954-4062
2041-2983
DOI:10.1243/095440604322887099