Manufacturing and modelling of sintered micro-porous absorption material for low frequency applications

Marjaana Karhu (Corresponding Author), Tomi J Lindroos, Seppo Uosukainen

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

A novel sintering based method to produce thin ultrahigh molecular weight polyethylene, UHMWPE, absorption material layer to increase absorption at low frequencies is introduced. The experimental impedance tube measurement results show that a 4 mm thick sintered sample layer increases absorption at a low frequency range below 1000 Hz compared with commercial melamine and polyester absorption foam samples. To cover a wider frequency range, multilayer structures composed of a sintered micro-porous material layer and commercial melamine and polyester foam layers are created and examined. The sintered sample layer also increases absorption in multilayer structures at low frequencies. Absorption coefficient values above 0.5 are reached starting from 200 Hz with multilayer structures. Software exploiting Biot's theory of porous materials has been adopted to fit the experimental absorption data for sintered samples, commercial foams and multilayers. Software based on Biot's theory was found to deliver quite good correlation with measured absorption coefficient values, with disagreements below 10% between the measured and estimated values.
Original languageEnglish
Pages (from-to)150-160
Number of pages11
JournalApplied Acoustics
Volume85
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

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material absorption
manufacturing
low frequencies
foams
laminates
melamine
polyesters
porous materials
absorptivity
frequency ranges
computer programs
polyethylenes
molecular weight
sintering
impedance
tubes

Keywords

  • ProperPart

Cite this

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abstract = "A novel sintering based method to produce thin ultrahigh molecular weight polyethylene, UHMWPE, absorption material layer to increase absorption at low frequencies is introduced. The experimental impedance tube measurement results show that a 4 mm thick sintered sample layer increases absorption at a low frequency range below 1000 Hz compared with commercial melamine and polyester absorption foam samples. To cover a wider frequency range, multilayer structures composed of a sintered micro-porous material layer and commercial melamine and polyester foam layers are created and examined. The sintered sample layer also increases absorption in multilayer structures at low frequencies. Absorption coefficient values above 0.5 are reached starting from 200 Hz with multilayer structures. Software exploiting Biot's theory of porous materials has been adopted to fit the experimental absorption data for sintered samples, commercial foams and multilayers. Software based on Biot's theory was found to deliver quite good correlation with measured absorption coefficient values, with disagreements below 10{\%} between the measured and estimated values.",
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Manufacturing and modelling of sintered micro-porous absorption material for low frequency applications. / Karhu, Marjaana (Corresponding Author); Lindroos, Tomi J; Uosukainen, Seppo.

In: Applied Acoustics, Vol. 85, 2014, p. 150-160.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Manufacturing and modelling of sintered micro-porous absorption material for low frequency applications

AU - Karhu, Marjaana

AU - Lindroos, Tomi J

AU - Uosukainen, Seppo

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AB - A novel sintering based method to produce thin ultrahigh molecular weight polyethylene, UHMWPE, absorption material layer to increase absorption at low frequencies is introduced. The experimental impedance tube measurement results show that a 4 mm thick sintered sample layer increases absorption at a low frequency range below 1000 Hz compared with commercial melamine and polyester absorption foam samples. To cover a wider frequency range, multilayer structures composed of a sintered micro-porous material layer and commercial melamine and polyester foam layers are created and examined. The sintered sample layer also increases absorption in multilayer structures at low frequencies. Absorption coefficient values above 0.5 are reached starting from 200 Hz with multilayer structures. Software exploiting Biot's theory of porous materials has been adopted to fit the experimental absorption data for sintered samples, commercial foams and multilayers. Software based on Biot's theory was found to deliver quite good correlation with measured absorption coefficient values, with disagreements below 10% between the measured and estimated values.

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