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Sound Field Prediction and Separation in a Moving Medium Using the Time-Domain Equivalent Source Method

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An alternative computational method based on time domain formulations of the convective Ffowcs Williams–Hawkings equation is proposed to acquire the source terms on the data surface used for sound field prediction. The proposed computational model is constructed based on the time-domain equivalent source method, which supposes that the source terms on the data surface are represented by a series of time-domain equivalent sources of monopole and dipole types. The strengths of those equivalent sources are determined by fitting the pressure data of collocation points outside the source region. The obtained source terms can not only be used to predict the total pressure at the observer, but also be used to separate the pressure component contributed by monopole source term and that contributed by dipole source term from the total pressure. Simulation results of stationary monopole and dipole sources as well as a rotating monopole source in a moving medium validate the effectiveness of the proposed method for both stationary and moving sources.
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Document Type: Research Article

Publication date: May 1, 2017

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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