Analysis of Noise barrier for Apartment

Kuan, Lin Jie (2017) Analysis of Noise barrier for Apartment. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Noise barrier is commonly used to isolate the noise from highway traffic in Malaysia. However, due to the limited height of the noise barrier, it is ineffective to isolate the noise propagated to high-rise building. Besides that, it is very high cost and dangerous if build a full height barrier. Thus the high-rise building must have its own noise isolation system. This project is to analysis of noise barrier for apartment to achieve objective which is reduce at least 5 dBA for indoor noise level and outdoor reflection noise level, and to make a new type of noise barrier for apartment. Therefore, this project is measured and identified the effectiveness of noise isolation of various types of walls in apartment. Literature had been search to understand more about the fundamental knowledge of the noise barrier designs and the related acoustic numerical analysis. The numerical analysis was carried out in ANSYS Workbench with Acoustic ACT extension and the reduction in Sound Pressure Level (SPL) for various wall types were compared. Various parameters effecting noise isolation including barrier material, thickness, surface shape and the used of PVC foam absorber were analysed. For barrier material properties parameter, wood, concrete and glass is used in the analysis. For thickness parameter, wood, concrete and glass thickness is 100 mm, 120 mm and 12 mm which is double up from the reference barriers thickness which is thin flat plate barrier. By the way, the thin flat plate thickness Then, the surface shape parameter is analysed by the bar shape surface. Besides that, T-shape design also including in the parameters. Due to simulation analysis, the results for indoor showed that T-shape glass barrier with PVC foam absorber has the highest effectiveness in noise isolation which is the SPL reduction is 29.0 dBA mean that reduced the SPL by 33.90%. Compare the thin flat plate results to without barrier result, it can conclude that concrete material is the best isolation material for indoor, the SPL reduction is 6.2 dBA which mean SPL reduction percentages is up to 12%. The worse material is glass material, the SPL reduction is 4.1 dBA which mean the SPL reduction percentages is just up to 7.8%. Although wood is not the best isolation material; however it reflects less noise to the surrounding (outdoor) compared to glass and concrete. Among all designs, the thin flat wood barrier with absorber is lowest reflection SPL for outdoor which is reflected the SPL by 35.05%. The findings from this research can be used as design criteria for high-rise building near to busy traffic.