Simulation studies on transmission loss of acoustic materials

Muhammad Sazalee Saifudin (2022) Simulation studies on transmission loss of acoustic materials. Universiti Malaysia Sabah. (Unpublished)

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Abstract

In the current state of world where technology has advances on daily basis has introduced a new set of problems to the urban community which is sound itself especially in a high population density area. This leads to noise pollution, namely sound transmission loss to be precise. According to the World Health Organisation (WHO) Noise pollution is considered to be the third most hazardous pollution after air and water pollution. Sound can be a double-edged sword as it has a tremendous amount of benefit that also brings its own caveat. It has been a constant battle to improve transmission loss in that sector in order to reduce the noise pollution especially in the building sector as its where most people will be working and doing everyday tasks. In this research, it will be focused towards simulation studies on transmission loss towards acoustic materials. The simulation will be conducted by using COMSOL Multiphysics using the features in it to assist on determining the transmission loss which is pressure acoustics and frequency domain. The setup for the simulation will involve the acoustical metamaterial structure of single-layer sandwich metamaterial plate and modelled of reverberation chamber based on standard ASTM E90. Aluminium will be the host plate which is the controlled variable, whereas melamine foam, polyurethane foam and glass fibre will be the surface plate. A total of three different thickness will be tested at different frequency level from 100 Hz until 5000 Hz; 30mm, 60mm and 90mmm for surface plate, with a constant thickness of host plate, 20mm. Result shows that the 90mm thickness has a superior performance in transmission loss for low frequency range between 100 Hz and 1600 Hz. In the higher frequency range from 1600 Hz to 5000 Hz 30mm thickness has higher transmission loss. Material also proven to play a vital role in the result as glass fibre with the highest density material has a higher transmission loss compared to melamine foam and polyurethane foam with lower density.

Item Type:	Academic Exercise
Keyword:	Transmission loss , Acoustic materials , Technology , COMSOL multiphysics , Noise pollution
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD1-1066 Environmental technology. Sanitary engineering > TD878-894 Special types of environment Including soil pollution, air pollution, noise pollution
Department:	FACULTY > Faculty of Engineering
Depositing User:	DG MASNIAH AHMAD -
Date Deposited:	11 Oct 2022 11:55
Last Modified:	11 Oct 2022 11:55
URI:	https://eprints.ums.edu.my/id/eprint/34332

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