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Now showing items 11-20 of 49
Bio-inspired Aerodynamic Noise Control: A Bibliographic Review
(2019)
It is well-known that many species of owl have the unique ability to fly silently, which can be attributed to their distinctive and special feather adaptations. Inspired by the owls, researchers attempted to reduce the ...
Non-linear Identification Applied to Broadband Turbomachinery Noise
(2008)
Coherence based source analysis techniques can be used to identify the contribution of
broadband noise sources in the exhaust of a gas turbine and hence enable the design of noise
reduction devices. However, when the ...
A graph-theory approach to optimisation of an acoustic absorber targeting a specific noise spectrum that approaches the causal optimum minimum depth
(2021)
Equivalent circuit analysis is a powerful tool for analysing acoustic systems where a lumped element model is valid. These equivalent circuits allow an overall impedance of the structure to be estimated which facilitates ...
Characterization of the aircraft bay/landing gear coupling noise at low subsonic speeds and its suppression using leading-edge chevron spoiler
(Sage Publications, 2019)
When the aircraft opens the bay door to let the landing gear either drop or retract, the incoming flow will result in a significant amount of coupling noise from the bay and the landing gear. Here, an experimental study ...
The Influence of Additive Manufacturing Processes on the Performance of a Periodic Acoustic Metamaterial
(2019)
Advancements in 3D print technology now allow the printing of structured acoustic absorbent materials at the appropriate microscopic scale and sample sizes. The repeatability of the fundamental cell unit of these metamaterials ...
Shear Layer Driven Acoustic Modes in a Cylindrical Cavity (AIAA 2010-3903)
(2010)
Coherence based source analysis techniques can be used to identify the contribution of
broadband noise sources in the exhaust of a gas turbine and hence enable the design of noise
reduction devices. However, when the ...
Experimental Investigations of Coherence Based Noise Source Identification Techniques for Turbomachinery Applications - Classic and Novel Techniques (AIAA-2011-2830)
(2011)
Coherence based noise source identi cation techniques utilise the ordinary linear coherence function between two signals to identify the contribution of one or more sources to the noise measured at a location of interest. ...
Numerical Study of the Trajectory, Penetration, and Interaction of Single and Tandem Jets in a Crossflow Using LES
(2024)
In this paper, a large eddy simulation (LES) method was used to conduct a study on single and tandem jets in a crossflow, focusing
particularly on their trajectory, penetration, and interaction. The numerical model was ...
An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing Gear
(2019)
The modern undercarriage system of a large aircraft normally requires the landing gear to be retractable. The nose landing gear, installed in the front of the fuselage, is retracted either forward or rearward. In the ...