Assessment of airframe noise

Block, P. J. W.

doi:10.2514/3.44641

Cited by 17 publications

(3 citation statements)

References 12 publications

(11 reference statements)

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“…For several years, research on airframe noise lagged that on engine noise. This area of research was first populated in the 1970s, when there was interest on minimum theoretical noise levels of an airborne vehicle, from birds to gliders 75 and Boeing airplanes 76 . There is now a wide body of experimental evidence, including sub-systems (discussed separately) and scaled airplane models 77,78 using phased microphone arrays.…”

Section: Airframe Noisementioning

confidence: 99%

Aircraft noise prediction

Smith¹

1989

Aircraft Noise

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This contribution addresses the state-of-the-art in the field of aircraft noise prediction, simulation and minimisation. The point of view taken in this context is that of comprehensive models that couple the various aircraft systems with the acoustic sources, the propagation and the flight trajectories. After an exhaustive review of the present predictive technologies in the relevant fields (airframe, propulsion, propagation, aircraft operations, trajectory optimisation), the paper addresses items for further research and development. Examples are shown for several airplanes, including the Airbus A319-100 (CFM engines), the Bombardier Dash8-Q400 (PW150 engines, Dowty R408 propellers) and the Boeing B737-800 (CFM engines). Predictions are done with the flight mechanics code FLIGHT. The transfer function between flight mechanics and the noise prediction is discussed in some details, along with the numerical procedures for validation and verification. Some code-to-code comparisons are shown. It is contended that the field of aircraft noise prediction has yet not reached a sufficient level of maturity. In particular, some parametric effects cannot be investigated, issues of accuracy are not currently addressed, and validation standards are still lacking.

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Section: Airframe Noisementioning

confidence: 99%

Aircraft noise prediction

Smith¹

1989

Aircraft Noise

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“…During airport approach when the engines of an aircraft are near idle and the high-lift systems and landing gear are deployed, airframe noise is a dominant noise source. The noise that is generated at the side edge of the flaps has been identified as an important component of airframe noise [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Noise Radiation from a Continuous Mold-Line Link Flap Configuration

Hutcheson

Brooks

Humphreys

2011

International Journal of Aeroacoustics

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“…During airport approach, when the engines of an aircraft are near idle condition, and the high-lift systems and landing gears are deployed, airframe noise is the dominant noise source. The noise that is generated at the side edge of the flaps has been identified as an important airframe noise component [1][2][3][4][5] and is a target for noise control.…”

Section: Introductionmentioning

confidence: 99%

PIV Measurements on a Blowing Flap

Hutcheson

Stead

2005

43rd AIAA Aerospace Sciences Meeting and Exhibit

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PIV measurements of the flow in the region of a flap side edge are presented for several blowing flap configurations. The test model is a NACA 63 2 -215 Hicks Mod-B main-element airfoil with a half-span Fowler flap. Air is blown from small slots located along the flap side edge on either the top, bottom or side surfaces. The test set up is described and flow measurements for a baseline and three blowing flap configurations are presented. The effects that the flap tip jets have on the structure of the flap side edge flow are discussed for each of the flap configurations tested. The results indicate that blowing air from a slot located along the top surface of the flap greatly weakened the top vortex system and pushed it further off the top surface. Blowing from the bottom flap surface kept the strong side vortex further outboard while blowing from the side surface only strengthened the vortex system or accelerated the merging of the side vortex to the flap top surface. It is concluded that blowing from the top or bottom surfaces of the flap may lead to a reduction of flap side edge noise.

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Assessment of airframe noise

Cited by 17 publications

References 12 publications

Aircraft noise prediction

Aircraft noise prediction

Noise Radiation from a Continuous Mold-Line Link Flap Configuration

PIV Measurements on a Blowing Flap

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