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IJSTR >> Volume 8 - Issue 8, August 2019 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Acoustical Transmission Loss Performance By Using Various Absorptive Material

[Full Text]



Dr. Amit Kumar Gupta, Sachin Jha



Transmission loss, Absorptive material, Baffle plate



The acoustical performance of duct with the variation of number of baffle plate, with and without of absorptive material, with and without effect of perforation, with the percentage variation of flow area. Transmission loss which is the main acoustic performance parameter is evaluated and determines the reduction in exhaust noise. This is performed in the 3D duct with empty, rock wool, glass wool. Different component are present in the duct for transmission loss like baffle plate, perforated baffle plate, absorptive material etc. by which noise is reduced. Transmission loss using sound absorption material is the main feature. With all combination the rock wool is best in all frequency range but in some frequency range empty duct is best so if we are working in this frequency range the empty duct has maximum transmission loss. Transmission loss of empty duct with all combination has not much change in the performance. But in the certain range of frequency transmission loss increasing very rapidly but also slope of curve very steep so if we are working before that then empty duct with 15% single baffle plate has transmission loss 50 dB. Finally rock wool has maximum transmission loss i.e 65dB in 5% perforation with single baffle plate if we go with same perforation rate i.e 5% with double baffle plate the best combination is 5% perforation and single baffle plate. If we are working at constant frequency i.e 2700 Hz the performance of empty duct is good well but not good for variable frequency.



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