• Brijesh KUmar
• Venkatasubbaiah K

: The developed resonant AMM is tested on 30 KVA capacity generator assembly for air borne noise reduction in order to enhance broadband noise reduction. This study is performed to demonstrate the performance of resonant type acoustic metamaterial over conventional sound absorbing material for broadband noise reduction. It is established from the present study that the broadband noise reduction can be enhanced by the use of Polyimide foam treated with detuned Helmholtz resonators and Quarter wave tubes. Here, resonators and QW tubes helps to reduce the low and medium frequency noise and Polyimide helps to reduce high frequency noise. The AMM is so designed that the split modes developed when tuned HRs are coupled to any acoustic cavity is also addressed by introducing detuned HRs and QW Tubes tuned to these virtual split modes. Further emphasis has been made on what type of low and medium frequency modes to be selected for better noise reduction.

"BROADBAND NOISE REDUCTION USING ACOUSTIC METAMATRIAL IN DG GEN SET", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 12, page no.e344-e350, December-2021, Available :http://www.jetir.org/papers/JETIR2112442.pdf

"BROADBAND NOISE REDUCTION USING ACOUSTIC METAMATRIAL IN DG GEN SET", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 12, page no. ppe344-e350, December-2021, Available at : http://www.jetir.org/papers/JETIR2112442.pdf