Browsing by Subject "Aeroacoustics"
Now showing items 1-17 of 17
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Aeroacoustic Noise Source Identification Using Irregularly Sampled LDV Measurements Coupled with Beamforming (AIAA-2011-2719)
(2011)This paper develops a technique which relates dynamic pressure measurements taken outside the hydrodynamic eld of a low speed jet to single point, one component velocity measurements taken within the jet using a Laser ... -
Aeroacoustic source characterization technique applied to a cylindrical Helmholtz resonator
(2011)The aim of this work is to investigate the sound produced by a Helmholtz resonator excited by a boundary layer. A deep cylindrical cavity with a small rectangular opening was designed to allow Helmholtz resonance as well ... -
Aeroacoustics research in Europe: The CEAS-ASC report on 2022 highlights
(2024)The Council of European Aerospace Societies (CEAS) Aeroacoustics Specialists Committee (ASC) supports and promotes the interests of the scientific and industrial aeroacoustics community on a European scale and European ... -
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. ... -
Experimental study of realistic low noise technologies applied to a full scale nose landing gear
(2021)The landing gear system is the dominant airframe noise source for most modern commercial aircraft during approach. This manuscript reports the results from the ALLEGRA (Advanced Low Noise Landing (Main and Nose) Gear for ... -
Fan Noise Reduction using Acoustic Metamaterials towards Efficient Data Centers
(2022)Unwanted sound from cooling fans has been a significant obstacle that limits the performance of data center Hard Disk Drive (HDD) storage systems. Acoustic metamaterials (AM) can be a solution to this problem. AM’s can ... -
SeMSA: a compact super absorber optimised for broadband, low-frequency noise attenuation
(2020)The attenuation of low-frequency broadband noise in a light, small form-factor is an intractable challenge. In this paper, a new technology is presented which employs the highly efficient visco-thermal loss mechanism of a ... -
Shear Layer Dynamics of a Cylindrical Cavity for Different Acoustic Resonance Modes
(2010)This paper investigates the interaction between the shear layer over a circular cavity and the flow-excited acoustic response of the volume to shear layer instability modes. Within the fluid-resonant category of cavity ... -
Spatial Noise Source Identification of Tonal Noise in Turbomachinery Using the Coherence Function on a Modal Basis (AIAA-2011-2825)
(2011)In modern helicopter engines, the core noise generated by the combustor and turbine stages dominates the core sound radiated from the engine exhaust. Identi cation of the specific contributions of each rotor-stator stage ...