• M G RAJAGOPAL
• MUZAMMIL SALGAR
• ARSH USMAN KHAN
• WASEEM AKRAM S K
• MD FASI ALI

Aircraft noise has been a public concern since the beginning of commercial jet powered aviation. Historical progress in noise reduction has been significant and largely made possible through land use planning, noise certification, and investment into low noise technology development. More recent progress however shows increasingly diminishing returns and suggests that new avenues may need to be discovered to pursue the aggressive noise reduction goals of the present and the future. This paper focuses on the research efforts in noise reduction in commercial aircrafts by modelling and analysis of aircraft structures and in Propulsion Airframe Aeroacoustics (PAA) through advanced engine installations and configurations, which is offered as an avenue that has potential to provide significant noise reduction. Several aircraft configurations and engine installations, both conventional and advanced, that are designed to take advantage of airframe shielding of engine noise are presented and discussed from both a PAA and a general design perspective. Other, non-shielding related PAA opportunities are also presented. Challenges to the eventual introduction of advanced aircraft configurations are discussed.

PAA(Propulsion Airframe Aeroacoustics) , Airframe shielding.

"NOISE REDUCTION IN COMMERCIAL AIRCRAFTS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 6, page no.a668-a675, June-2022, Available :http://www.jetir.org/papers/JETIR2206080.pdf

"NOISE REDUCTION IN COMMERCIAL AIRCRAFTS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 6, page no. ppa668-a675, June-2022, Available at : http://www.jetir.org/papers/JETIR2206080.pdf