The sound scattering from a cylinder with locally varying surface impedance is studied, using a variant of the generalized minimum residual method (GMRES), along with an appropriate preconditioning, which was originally developed for iterative solutions in electrodynamics . The starting point is a self-adjoint formulation of the Helmholtz integral equation for scattering. The GMRES is applied to the scattering of a plane wave from a finite cylinder with locally varying surface impedance. Fast convergence of the iteration process is observed for most of the investigated cases. The GMRES solver is only weakly affected by internal resonances, but could be combined with a dual-layer CHIEF approach. The results are compared with those of a standard direct collocational BEM approach, implemented in LMS SYSNOISE. The results of both methods agree very well for all considered configurations.
Document Type: Research Article
Publication date: January 1, 2003
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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.