Study On The Effect Of Holes Arrangement Of Absorptive Silencer On The Sound Transmission Loss Performance

Mok, Juan Chien (2016) Study On The Effect Of Holes Arrangement Of Absorptive Silencer On The Sound Transmission Loss Performance. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Absorptive silencer is a device which used to impede noise and attenuate incident sound level produced by a source. Absorptive silencer had straight through design with fiberglass shielded from the exhaust stream by perforated sheet metal. In today modern life, noise has been rising to become new physical environmental factors that could threaten our health condition. Hence, development and research of absorptive silencer have been encouraged to overcome the environmental problems that related with noise pollution. Extensive researches on absorptive silencer have been encouraged due impact on human health and environmental concerns and the development of novel absorptive silencer has become one of the essential elements in the future. Holes arrangements have become the focus and the study parametric in this project. A total of five samples with different holes arrangement have been successfully developed and were all tested and analyzed by using impedance tube in accordance with proper testing methods of ASTM E2611. The findings show that different novel holes arrangement of absorptive silencer produced in this study have excellent sound attenuation properties in various frequency ranges. In the category of displacement based silencers, the 1 cm apart design has the significant performance in high frequency while 2 cm and 3 cm have the obvious attenuation capability in high-medium and low-medium frequency respectively. On the contrary, angle based arrangement silencer with 60° has the superior sound transmission performance. Throughout this study, it can be concluded that acoustic attenuation of absorptive silencers are poor in low frequency and most effects of parametric was show in high frequency.

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