An investigation of passive and active noise reduction using commercial and standard TDH-49 headphones

Abdulkarim, Shalool; Zainal, Nasharuddin; Beng, Gan Kok; Umat, Cila

doi:10.1109/icaees.2016.7888118

Cited by 1 publication

(1 citation statement)

References 7 publications

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“…Some materials of the barrier have the ability to absorb the sound energy while some material of barrier can reflect them. Noise barriers are specifically is effective to attenuate the high-frequencies noise [14]. Also, they are particularly effective at close distances where the acoustic shadow zone is formed.…”

Section: Introductionmentioning

confidence: 99%

Reduction through Brick Wall Barrier and Acoustic Sponge of Environmental Noise Levels from Chiller Cooling System

Tufaner

2020

Sakarya University Journal of Science

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The aim of this study was to investigate the noise level reduction of the air cooled liquid chiller to the desired levels of environmental noise requisite. Noise control procedures are implemented with various systems to prevent environmental noise disturbances. This paper examines the application of a passive noise control approach to the control of air-cooled liquid chiller noise located in the garden of an official institution. The approach of passive noise control utilizing brick walls with acoustic sponge in the immediate vicinity of the chiller is discussed. When the chiller was covered with a brick wall, the noise level was reduced by 5.5 Leq dBA 1 m away from the nearest residence. However, this reduction could not meet the requirements of legal regulations. Therefore, the inside of brick wall was covered with acoustic sponge. As a result, the ambient noise level where 1m away from the nearest residence to the chiller has been reduced to the background noise levels with a total reduction of about 8.5 Leq dBA. It is shown that, due to the noise produced by the chiller fans and compressors, so as to achieve significantly cognizable levels of noise reduction it is necessary to isolation brick walls with acoustic sponge.

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Section: Introductionmentioning

confidence: 99%

Reduction through Brick Wall Barrier and Acoustic Sponge of Environmental Noise Levels from Chiller Cooling System

Tufaner

2020

Sakarya University Journal of Science

View full text Add to dashboard Cite

show abstract

An investigation of passive and active noise reduction using commercial and standard TDH-49 headphones

Cited by 1 publication

References 7 publications

Reduction through Brick Wall Barrier and Acoustic Sponge of Environmental Noise Levels from Chiller Cooling System

Reduction through Brick Wall Barrier and Acoustic Sponge of Environmental Noise Levels from Chiller Cooling System

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