Perforated plate backing with coconut fiber as sound absorber for low and mid range requencies

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

A material's sound absorbing properties can be described as a sound absorption coefficient in a particular frequency range. Porous absorbers are the most commonly used sound absorbing materials, however they do not have good absorption properties at low and mid frequencies. In order to increase the absorption properties at low and mid frequencies, porous absorber should have larger thickness and size. By using perforated plates backing with porous absorber, it is possible to gain higher noise absorption at low and mid frequencies. This study was conducted to investigate the effect of perforation size ratio, mass, air gap and holes diameter of perforated plates as backing plate for porous absorber. Coconut fibres were used as backing medium for perforated plates. Perforated plates were fabricated using two different materials; aluminium and zinc plates with perforation size ratio of 0.10, 0.15 and 0.22 at thickness of 1 mm. The holes diameters of the perforated plates are 2 mm, 3 mm, and 4 mm, respectively. The tests samples were tested at the acoustic lab of the Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia according to ASTM E 1050-98 international standards for noise absorption coefficient. The data presented the perforated plates backing with coconut fibers have perforation ratio less to 0.22 showed the significant absorption at 800 Hz - 1800 Hz frequency range. The perforated plates backing with coconut fibers that their holes diameters are 4 mm also showed a good absorption at 600 Hz - 1800 Hz frequency range. However, perforated plates backing with coconut fibers showed a decreasing absorption coefficient at frequencies more than 1800 Hz.

Original languageEnglish
Title of host publicationKey Engineering Materials
Pages1284-1289
Number of pages6
Volume462-463
DOIs
Publication statusPublished - 2011
Event8th International Conference on Fracture and Strength of Solids 2010, FEOFS2010 - Kuala Lumpur
Duration: 7 Jun 20109 Jun 2010

Publication series

NameKey Engineering Materials
Volume462-463
ISSN (Print)10139826

Other

Other8th International Conference on Fracture and Strength of Solids 2010, FEOFS2010
CityKuala Lumpur
Period7/6/109/6/10

Fingerprint

Perforated plates
Acoustic waves
Fibers
Aluminum
Zinc
Acoustics

Keywords

  • Absorption coefficient
  • Holes diameter
  • Perforated plates
  • Perforation ratio

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Perforated plate backing with coconut fiber as sound absorber for low and mid range requencies. / Zulkifli, Rozli; Zulkarnain, ; Mohd Nor, Mohd. Jailani; Abdullah, Shahrum.

Key Engineering Materials. Vol. 462-463 2011. p. 1284-1289 (Key Engineering Materials; Vol. 462-463).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Zulkifli, R, Zulkarnain, , Mohd Nor, MJ & Abdullah, S 2011, Perforated plate backing with coconut fiber as sound absorber for low and mid range requencies. in Key Engineering Materials. vol. 462-463, Key Engineering Materials, vol. 462-463, pp. 1284-1289, 8th International Conference on Fracture and Strength of Solids 2010, FEOFS2010, Kuala Lumpur, 7/6/10. https://doi.org/10.4028/www.scientific.net/KEM.462-463.1284
Zulkifli, Rozli ; Zulkarnain, ; Mohd Nor, Mohd. Jailani ; Abdullah, Shahrum. / Perforated plate backing with coconut fiber as sound absorber for low and mid range requencies. Key Engineering Materials. Vol. 462-463 2011. pp. 1284-1289 (Key Engineering Materials).
@inproceedings{1aaf5149453c4713806f75f7e7984c9c,
title = "Perforated plate backing with coconut fiber as sound absorber for low and mid range requencies",
abstract = "A material's sound absorbing properties can be described as a sound absorption coefficient in a particular frequency range. Porous absorbers are the most commonly used sound absorbing materials, however they do not have good absorption properties at low and mid frequencies. In order to increase the absorption properties at low and mid frequencies, porous absorber should have larger thickness and size. By using perforated plates backing with porous absorber, it is possible to gain higher noise absorption at low and mid frequencies. This study was conducted to investigate the effect of perforation size ratio, mass, air gap and holes diameter of perforated plates as backing plate for porous absorber. Coconut fibres were used as backing medium for perforated plates. Perforated plates were fabricated using two different materials; aluminium and zinc plates with perforation size ratio of 0.10, 0.15 and 0.22 at thickness of 1 mm. The holes diameters of the perforated plates are 2 mm, 3 mm, and 4 mm, respectively. The tests samples were tested at the acoustic lab of the Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia according to ASTM E 1050-98 international standards for noise absorption coefficient. The data presented the perforated plates backing with coconut fibers have perforation ratio less to 0.22 showed the significant absorption at 800 Hz - 1800 Hz frequency range. The perforated plates backing with coconut fibers that their holes diameters are 4 mm also showed a good absorption at 600 Hz - 1800 Hz frequency range. However, perforated plates backing with coconut fibers showed a decreasing absorption coefficient at frequencies more than 1800 Hz.",
keywords = "Absorption coefficient, Holes diameter, Perforated plates, Perforation ratio",
author = "Rozli Zulkifli and Zulkarnain and {Mohd Nor}, {Mohd. Jailani} and Shahrum Abdullah",
year = "2011",
doi = "10.4028/www.scientific.net/KEM.462-463.1284",
language = "English",
isbn = "9780878492107",
volume = "462-463",
series = "Key Engineering Materials",
pages = "1284--1289",
booktitle = "Key Engineering Materials",

}

TY - GEN

T1 - Perforated plate backing with coconut fiber as sound absorber for low and mid range requencies

AU - Zulkifli, Rozli

AU - Zulkarnain,

AU - Mohd Nor, Mohd. Jailani

AU - Abdullah, Shahrum

PY - 2011

Y1 - 2011

N2 - A material's sound absorbing properties can be described as a sound absorption coefficient in a particular frequency range. Porous absorbers are the most commonly used sound absorbing materials, however they do not have good absorption properties at low and mid frequencies. In order to increase the absorption properties at low and mid frequencies, porous absorber should have larger thickness and size. By using perforated plates backing with porous absorber, it is possible to gain higher noise absorption at low and mid frequencies. This study was conducted to investigate the effect of perforation size ratio, mass, air gap and holes diameter of perforated plates as backing plate for porous absorber. Coconut fibres were used as backing medium for perforated plates. Perforated plates were fabricated using two different materials; aluminium and zinc plates with perforation size ratio of 0.10, 0.15 and 0.22 at thickness of 1 mm. The holes diameters of the perforated plates are 2 mm, 3 mm, and 4 mm, respectively. The tests samples were tested at the acoustic lab of the Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia according to ASTM E 1050-98 international standards for noise absorption coefficient. The data presented the perforated plates backing with coconut fibers have perforation ratio less to 0.22 showed the significant absorption at 800 Hz - 1800 Hz frequency range. The perforated plates backing with coconut fibers that their holes diameters are 4 mm also showed a good absorption at 600 Hz - 1800 Hz frequency range. However, perforated plates backing with coconut fibers showed a decreasing absorption coefficient at frequencies more than 1800 Hz.

AB - A material's sound absorbing properties can be described as a sound absorption coefficient in a particular frequency range. Porous absorbers are the most commonly used sound absorbing materials, however they do not have good absorption properties at low and mid frequencies. In order to increase the absorption properties at low and mid frequencies, porous absorber should have larger thickness and size. By using perforated plates backing with porous absorber, it is possible to gain higher noise absorption at low and mid frequencies. This study was conducted to investigate the effect of perforation size ratio, mass, air gap and holes diameter of perforated plates as backing plate for porous absorber. Coconut fibres were used as backing medium for perforated plates. Perforated plates were fabricated using two different materials; aluminium and zinc plates with perforation size ratio of 0.10, 0.15 and 0.22 at thickness of 1 mm. The holes diameters of the perforated plates are 2 mm, 3 mm, and 4 mm, respectively. The tests samples were tested at the acoustic lab of the Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia according to ASTM E 1050-98 international standards for noise absorption coefficient. The data presented the perforated plates backing with coconut fibers have perforation ratio less to 0.22 showed the significant absorption at 800 Hz - 1800 Hz frequency range. The perforated plates backing with coconut fibers that their holes diameters are 4 mm also showed a good absorption at 600 Hz - 1800 Hz frequency range. However, perforated plates backing with coconut fibers showed a decreasing absorption coefficient at frequencies more than 1800 Hz.

KW - Absorption coefficient

KW - Holes diameter

KW - Perforated plates

KW - Perforation ratio

UR - http://www.scopus.com/inward/record.url?scp=79551500815&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79551500815&partnerID=8YFLogxK

U2 - 10.4028/www.scientific.net/KEM.462-463.1284

DO - 10.4028/www.scientific.net/KEM.462-463.1284

M3 - Conference contribution

SN - 9780878492107

VL - 462-463

T3 - Key Engineering Materials

SP - 1284

EP - 1289

BT - Key Engineering Materials

ER -