Experimental Investigation On Sound Transmission Loss Of Acrylic Perforated Panel

Noor Wahidah, Gulam Mahfuze (2010) Experimental Investigation On Sound Transmission Loss Of Acrylic Perforated Panel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) Experimental Investigation On Sound Transmission Loss Of Acrylic Perforated Panel.pdf - Submitted Version Restricted to Registered users only until 1 January 2021. Download (811kB)

Abstract

Nowadays, there are a lot of environmental pollution has been going on around us, one is noise pollution. Noise pollution is generated by the engine noise, animal or human that interferes with the activity or balance and comfort of human and animal life. Under construction industry is one of the causes of noise pollution. For example a sound emitted by machinery through material processing and production of events. Various measures have been taken but it cannot meet the requirements. Many sound absorption material is of synthetic material source is especially harmful to human health and the environment. The precious natural fibres are of the opinion that the potential for alternative sources of sound-absorbing as it is environmentally friendly, lightweight, and harmless. The aim of this study was to determine the potential of the acrylic material which is also a natural fibre to minimize noise pollution. The design study concept is first cut acrylic plate and holes using the drill. The diameter of the hole to be measured sound transmission loss is 0.5mm, 0.8mm, 1 mm and 1.2mm. Use a PVC tube to send sound into the system. This study was conducted to assess the effectiveness of the design perforated acrylic panels to reduce noise. Microphones used to detect acoustic pressure emitted from the speaker through acrylic perforated panel and transferred to the analyzer signal. Noise Reduction Index (NRI) speaker after the execution of each acrylic perforated panel calculated. Results showed that the acrylic perforated panel with holes 1 mm more efficient when the noise level high frequency region than the acrylic panel perforated with holes 4mm reduce the noise level in the middle frequency region. The more small holes in acrylic panel, the harder sound of the voice could penetrate. The most effective composition of acrylic panels perforated with holes 1 mm to reduce 30 dB sound pressure level (SPL).

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