Assessment of engine noise shielding by the wings of current turbofan aircraft

Conference paper (2017)

Authors

A.E. Vieira Aircraft Noise and Climate Effects - Aerospace Engineering
M. Snellen Aircraft Noise and Climate Effects - Aerospace Engineering
D.G. Simons Aircraft Noise and Climate Effects - Aerospace Engineering
Research Group
Aircraft Noise and Climate Effects (Aerospace Engineering) (TU Delft)
Copyright: © 2017 A.E. Vieira, M. Snellen, D.G. Simons
Noise shielding Diffraction Integral Method Kirchhoff integral method Modified theory of physical optics
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Published Date

2017

Language

English

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Faculty

Aerospace Engineering

Department

Control & Operations

Research Group

Aircraft Noise and Climate Effects

Abstract

The shielding of engine noise by the aircraft wings and fuselage can lead to a significant reduction on perceived noise on ground. Most research on noise shielding is focused on BlendedWing Body (BWB) configurations because of the large dimension of the fuselage. However, noise shielding is also considered relevant in conventional tube and wing configurations when the engines are mounted above the wings. Therefore, it is important to have a noise shielding method adaptable to different aircraft geometries without compromising the accuracy of the predictions or resulting in very slow computations. In this work two methods are used to calculate noise shielding and compared in terms of accuracy and computational time, the Diffraction Integral Method (DIM) and a method built on the Modified Theory of the Physical Optics (MTPO). Both methods are based on the Kirchhoff integral and are considered accurate for sharp-edged objects. It was verified that the two methods are comparable in terms of their predictions, but the MTPO-based method is more efficient computationally. Noise shielding predictions for different frequencies are presented for a flyover of the Fokker 70 considering a realistic geometry and flight conditions. These predictions indicate significant values of noise shielding, which demonstrates its importance in current aircraft.