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Non-Axisymmetric Acoustic Propagation in and Radiation from Lined Ducts in a Subsonic Uniform Mean Flow: An Axisymmetric Boundary Element Formulation

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A direct collocation boundary element formulation for the calculation of acoustic propagation in a subsonic uniform mean flow is presented. The model is directed towards calculation of the propagation inside and radiation from axisymmetric lined ducts. The model takes its starting point in an axisymmetric boundary element formulation, but is extended to non-axisymmetric boundary conditions so non-axisymmetric excitation is feasible (spinning modes). The singularities in the Green's function and its normal derivative are integrated analytically over the angle of revolution and expressed as sums of elliptic integrals in order to minimize the computational work. An iterative scheme allows the modelling of infinite and semiinfinite circular ducts.
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Document Type: Research Article

Publication date: 01 September 2000

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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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