Finite element and boundary element methods are known to be rather accurate numerical tools for the investigation of acoustical problems. It turned out, however, that early formulations of these methodologies are rather computer time consuming, which keeps people from using them in practical applications. Consequently, many researchers started thinking of how to make these methods more efficient. The present paper aims to give an overview of the current possibilities to reduce computational efforts in acoustics. Speed ups in a single frequency calculation as well as in a multi frequency run are critically reviewed, and it is tried to help the reader to understand, which measures yield correct results in an efficient way and which are risky to use. In particular, significant coarsening and simplifications of a problem, improved element formulations, and acoustic transfer functions are considered when looking at single frequency calculations. Complete frequency spectra can be calculated faster, if frequency interpolation schemes or a special source simulation technique are employed. All methodologies discussed in this contribution are introduced briefly and representative examples are shown which demonstrate how the new approaches can be used and how efficient and accurate they are.
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.