Modeling of Three-Dimensional Sound Directivity Patterns of Helicopters
Measurements on helicopters in flight have been performed in order to improve the noise characteristics used in computer simulations of helicopter noise. A new method of deriving a three-dimensional directivity pattern of the noise source from the measurements is presented. The method is based on a fit of the measured data to spherical harmonics. Using these models the sound emission for different flight procedures is investigated and compared to measured data.
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Document Type: Research Article
Publication date: March 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.
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