Study On The Effect Of Hole Shape And Geometry Of Absorptive Silencer On The Sound Transmission Loss Performance

Yaman, Muhammad Firdaus (2016) Study On The Effect Of Hole Shape And Geometry Of Absorptive Silencer On The Sound Transmission Loss Performance. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Noise pollution produced by industry and car makes an area exposed to noise will cause danger ahead and can get hearing problem. The important thing that the noise is usually comes from the exhaust system. This paper investigated the effect of hole shape and geometry of absorptive silencer in a muffler. Muffler is such a device used for reducing the amount of unwanted noise. The design inside muffler have silencer, the silencer have a perforated tube to reduce the sound transmission loss of the muffler. Noise attenuation muffler depends on quality of the absorption materials and its internal geometry. This paper discuss the effect when use different hole size for silencer on sound transmission loss and insertion loss with use the size of hole is 2 mm, 4 mm, 6 mm, 8mm and 10 mm with using the glass wool for material absorption silencer tube. The experiment to investigate the effect hole shape and geometry of absorptive silencer in the muffler tested using ASTM E2611 to determine the sound transmission loss and insertion loss for each sample hole size. In conclusion the result shows that when the hole size was changed from smallest up to the larger size from 2 mm, 4 mm, 6 mm, 8 mm and 10 mm the absorption sound transmission loss is increase when the holes size is increased, hole size 10 mm has a good absorptive sound transmission loss because can absorb higher frequency.

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