Prediction of acoustic scattering in the time domain using a moving equivalent source method

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

4 Scopus citations

Abstract

A new and efficient numerical method to solve acoustic scattering in the time domain is presented in the present paper. Equivalent sources are embedded within a scattering surface and their strengths are determined as a function of time by the pressure-gradient boundary condition on a scattering surface. Once the strengths are determined, the equivalent sources are used to predict the scattered pressure. Linear shape functions are used to discretize the strength of the equivalent sources in time and singular value decomposition is used to find the least-squares solution and to overcome potential numerical instabilities. The predictions are found to be in excellent agreement with the exact solutions for sound from a point monopole source and band-passed broadband sound. The method works well even at the irregular frequencies at which internal resonance modes occur. Finally, the method is used to predict the scattering of sound from a moving source. It is shown that the method has the capability to capture aperiodic characteristics very well.

Original languageEnglish (US)
Title of host publication15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)
StatePublished - Dec 1 2009
Event15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference) - Miami, FL, United States
Duration: May 11 2009May 13 2009

Publication series

Name15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)

Other

Other15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)
CountryUnited States
CityMiami, FL
Period5/11/095/13/09

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All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Mechanical Engineering

Cite this

Lee, S., Brentner, K. S., & Morris, P. J. (2009). Prediction of acoustic scattering in the time domain using a moving equivalent source method. In 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference) [2009-3177] (15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)).