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

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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.

Original languageEnglish
Title of host publication24th International Congress on Sound and Vibration
Subtitle of host publicationLondon calling 2017
EditorsB. Gibbs
PublisherInternational Institute of Acoustics and Vibration, IIAV
Number of pages8
ISBN (Electronic)ISBN 978-1-906913-27-4
Publication statusPublished - 2017
Event24th International Congress on Sound and Vibration: London Calling, 2017 - London, United Kingdom
Duration: 23 Jul 201727 Jul 2017
Conference number: 24


Conference24th International Congress on Sound and Vibration
Abbreviated titleICSV 2017
CountryUnited Kingdom
Internet address


  • Diffraction Integral Method
  • Kirchhoff integral method
  • Modified theory of physical optics
  • Noise shielding

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