Acoustical Analysis of Insertion Losses of Ceiling Materials | [Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences • 2023]

Author(s):

1. Enobong Patrick Obot: Department of Physics, Alex Ekwueme Federal University Ndufu-Alike,Ebonyi State,Nigeria

2. Rufus Chika Okoro: Department of Physics, University of Calabar,Cross River State,Nigeria

3. Daniel Efiong Oku Christian Nlemchukwu Nwosu: Department of Physics, Alex Ekwueme Federal University Ndufu-Alike,Ebonyi State,Nigeria

4. Christian Nlemchukwu Nwosu: Department of Physics, Alex Ekwueme Federal University Ndufu-Alike,Ebonyi State,Nigeria

5. Michael Ugwu Onuu: Department of Physics, Alex Ekwueme Federal University Ndufu-Alike,Ebonyi State,Nigeria

Abstract:

This study concentrates on measuring, analyzing and recommending the ceiling materials most suited for the reduction of distinct frequency noise levels with focus on rain noise. A frequency analyzer has been used to measure and obtained accurate sound level (LP) data of the rain noise outside, and inside five buildings with diverse acoustical ceiling materials in South Eastern Nigeria. It was done with and without the ceiling partition (or noise barrier) for the audio and narrow frequency band without contribution from other outdoor-related noise sources. Insertion losses of the ceiling materials were calculated using the data obtained from the measured LP. Result obtained from the analysis indicated that the ceiling material found to efectively reduce the noise levels from external noise source. The type for speech reception threshold frequencies of more than 125 Hz and higher audiometric range was moabi wood with peak LP of 21.20 dB at 500 Hz. While for lower frequencies where the ears are least responsive was plaster of Paris (POP) with peak LP of 12.61 dB at 62.5 Hz. This makes “moabi wood” most suitable in lecture rooms, conference halls and large auditoriums as ceiling material, in consideration of its capability to provide notable attenuation of rain noise within the building. This is in accordance with several other studies done on this subject. In general, at much low frequencies and frequencies greater than 2k Hz significant reduction in the rain noise level was observed.

Page(s): 15-25

DOI: 10.53560/PPASA(15-25)635

Published: Journal: Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, Volume: 60, Issue: 3, Year: 2023

Keywords:

Frequency Analyser , Acoustic Ceiling Material , Acoustic Insertion Loss , Sound Enclosure , Sound Pressure Level

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