Assessment of time-domain equivalent source method for acoustic scattering

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Equivalent source methods have been developed in the frequency and time domain to provide a fast and efficient computation for acoustic scattering. Although the advantages and capabilities of the method have been demonstrated, the limitations and drawbacks of the method have not yet been explored in detail. A detailed understanding of the equivalent source method is needed to use the method in a wide range of applications with more confidence. This paper presents an assessment of the time-domain equivalent source method for the prediction of acoustic scattering. The sensitivity of the method to numerical parameters, including the number of the surface collocation points, the number and position of the equivalent sources, the time step, and the cut-off singular value, is investigated and suggestions for these parameters are given for accurate predictions. A numerical instability issue is shown and a way to stabilize the solution with a time-averaging scheme is introduced. The sound power is calculated using the equivalent source strength to demonstrate the redistribution of the sound intensity by a scattering body and the conservation of the total power. Finally, scattering of sound from a source in a short duct is tested to demonstrate the utility of the tool for a more complicated shape of the scattering surface.

Original languageEnglish (US)
Title of host publication16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference)
StatePublished - Dec 6 2010
Event16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference) - Stockholm, Sweden
Duration: Jun 7 2010Jun 9 2010

Publication series

Name16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference)

Other

Other16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference)
CountrySweden
CityStockholm
Period6/7/106/9/10

Fingerprint

acoustic scattering
Acoustics
Scattering
Acoustic waves
Acoustic intensity
scattering
sound intensity
acoustics
collocation
Ducts
predictions
Conservation
ducts
suggestion
conservation
confidence
cut-off
sensitivity

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Acoustics and Ultrasonics

Cite this

Lee, S., Brentner, K. S., & Morris, P. J. (2010). Assessment of time-domain equivalent source method for acoustic scattering. In 16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference) [2010-3821] (16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference)).
Lee, Seongkyu ; Brentner, Kenneth Steven ; Morris, Philip John. / Assessment of time-domain equivalent source method for acoustic scattering. 16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference). 2010. (16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference)).
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Lee, S, Brentner, KS & Morris, PJ 2010, Assessment of time-domain equivalent source method for acoustic scattering. in 16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference)., 2010-3821, 16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference), 16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference), Stockholm, Sweden, 6/7/10.

Assessment of time-domain equivalent source method for acoustic scattering. / Lee, Seongkyu; Brentner, Kenneth Steven; Morris, Philip John.

16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference). 2010. 2010-3821 (16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference)).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - Equivalent source methods have been developed in the frequency and time domain to provide a fast and efficient computation for acoustic scattering. Although the advantages and capabilities of the method have been demonstrated, the limitations and drawbacks of the method have not yet been explored in detail. A detailed understanding of the equivalent source method is needed to use the method in a wide range of applications with more confidence. This paper presents an assessment of the time-domain equivalent source method for the prediction of acoustic scattering. The sensitivity of the method to numerical parameters, including the number of the surface collocation points, the number and position of the equivalent sources, the time step, and the cut-off singular value, is investigated and suggestions for these parameters are given for accurate predictions. A numerical instability issue is shown and a way to stabilize the solution with a time-averaging scheme is introduced. The sound power is calculated using the equivalent source strength to demonstrate the redistribution of the sound intensity by a scattering body and the conservation of the total power. Finally, scattering of sound from a source in a short duct is tested to demonstrate the utility of the tool for a more complicated shape of the scattering surface.

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Lee S, Brentner KS, Morris PJ. Assessment of time-domain equivalent source method for acoustic scattering. In 16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference). 2010. 2010-3821. (16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference)).