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Measurement and Simulation of Surface Roughness Noise Using Phased Microphone Arrays

Liu, Y, Dowling, AP and Shin, HC (2008) Measurement and Simulation of Surface Roughness Noise Using Phased Microphone Arrays Journal of Sound and Vibration, 314 (1-2). pp. 95-112.

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A turbulent boundary-layer flow over a rough wall generates a dipole sound field as the near-field hydrodynamic disturbances in the turbulent boundary-layer scatter into radiated sound at small surface irregularities. In this paper, phased microphone arrays are applied to the measurement and simulation of surface roughness noise. The radiated sound from two rough plates and one smooth plate in an open jet is measured at three streamwise locations, and the beamforming source maps demonstrate the dipole directivity. Higher source strengths can be observed on the rough plates which also enhance the trailing-edge noise. A prediction scheme in previous theoretical work is used to describe the strength of a distribution of incoherent dipoles and to simulate the sound detected by the microphone array. Source maps of measurement and simulation exhibit satisfactory similarities in both source pattern and source strength, which confirms the dipole nature and the predicted magnitude of roughness noise. However, the simulations underestimate the streamwise gradient of the source strengths and overestimate the source strengths at the highest frequency.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Liu, Y
Dowling, AP
Shin, HC
Date : 8 July 2008
DOI : 10.1016/j.jsv.2007.12.041
Additional Information : NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Sound and Vibration. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Sound and Vibration, 314(1-2), July 2008, DOI 10.1016/j.jsv.2007.12.041.
Depositing User : Symplectic Elements
Date Deposited : 03 Sep 2014 15:41
Last Modified : 31 Oct 2017 15:35

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