Aircraft Sound Measurements: The Influence of Microphone Height
Aircraft sound levels measured at specific monitoring locations may depend on microphone height. Well-controlled measurements at 1.2 m and at 10 m above porous ground illustrate how the low frequency components of the spectrum vary with microphone height. The overall influence of microphone height on the A-weighted levels is small for aircraft with jet engines in a flyover situation and for distances shorter than 1000 m. However, the microphone at 1.2 m measures lower levels than a higher microphone in cases where the measurement site is far to the side of the flight path i.e. at low elevation angles of sound incidence, and when the measured spectrum is dominated by low frequencies, as this is often the case with propeller driven aircraft and propagation over long distances.
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Document Type: Research Article
Publication date: September 1, 2005
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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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