The Influence of a Narrow Tube on the Measurement of Pressure Fluctuations
The modelization of the propagation of acoustical waves in a small internal diameter tube allows a good prediction of the frequency response of a pressure measurement system; nevertheless, the complexity of the transfer function and the number of characteristic geometrical parameters, don't allow the a priori determination of an optimum geometry of the pneumatic line. The analytical study displays the respective influences of the different elements of the pneumatic line between the transducer and the pressure tap. A methodology to optimize the geometry of a restriction of section (called restrictor), used to correct the distorsion introduced by the pneumatic line, has been established: it is based on a non-dissipative model in the tube, associated with a quasi-steady flow assumption in the restrictor. This first optimization, completed by a further adjustment of the position of the restrictor along the tube, provides a corrected useful frequency bandwith, rather satisfying for the purpose of unsteady pressure measurements.
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Document Type: Research Article
Publication date: November 1, 1998
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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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