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Sound Absorption Characteristics of Porous Steel Manufactured by Lost Carbonate Sintering

Published online by Cambridge University Press:  31 January 2011

Miao Lu ,
Carl Hopkins ,
Yuyuan Zhao  and
Gary Seiffert
Miao Lu
Affiliation:
miao.lu@liv.ac.uk, University of Liverpool, Department of Engineering, Liverpool, United Kingdom
Carl Hopkins
Affiliation:
carlh@liv.ac.uk, University of Liverpool, School of Architecture, Liverpool, United Kingdom
Yuyuan Zhao
Affiliation:
y.y.zhao@liv.ac.uk, University of Liverpool, Department of Engineering, Liverpool, United Kingdom
Gary Seiffert
Affiliation:
aru@liv.ac.uk, University of Liverpool, School of Architecture, Liverpool, United Kingdom
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Abstract

This paper investigates the sound absorption characteristics of porous steel samples manufactured by Lost Carbonate Sintering. Measurements of the normal incidence sound absorption coefficient were made using an impedance tube for single-layer porous steel discs and assemblies comprising four layers of porous steel discs. The sound absorption coefficient was found not to vary significantly with pore size in the range of 250-1500 μm. In general, the absorption coefficient increases with increasing frequency and increasing thickness, and peaks at specific frequencies depending on the porosity. An increase in porosity tends to increase the frequency at which the sound absorption coefficient reaches this peak. An advantage was found in using an assembly of samples with gradient porosities of 75%-70%-65%-60% as it gave higher and more uniform sound absorption coefficients than an assembly with porosities of 75%.

Keywords

acousticabsorptionporosity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1188: Symposium LL – Architectured Multifunctional Materials , 2009 , 1188-LL07-04
Copyright
Copyright © Materials Research Society 2009

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