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Functions of Diffraction Correction and Analytical Solutions in Nonlinear Acoustic Measurement Fonctions de correction de la diffraction et solutions analytiques dans les mesures en acoustique non linéaire

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This paper presents an analytical formulation for correcting the diffraction associated with the second harmonic of an acoustic wave that is more compact than that usually used. This new formulation, resulting from an approximation of the correction applied to fundamental, makes it possible to obtain simple solutions for the second harmonic of the average acoustic pressure but is sufficiently precise for measuring the parameter of nonlinearity B/A in a finite amplitude method. Comparison with other expressions requiring numerical integration show that the solutions are precise in the nearfield.

Dans cet article nous présentons une formulation analytique de la correction de la diffraction appliquée au second harmonique de la pression acoustique, plus compacte que celle habituellement utilisée. Cette nouvelle formulation, obtenue à l'aide d'une approximation de la correction appliquée au fondamental, permet d'obtenir des solutions simples pour le second harmonique de la pression acoustique moyenne, mais suffisamment précises pour être utilisées dans des systèmes de mesure du paramèetre de non-linéarité B/A utilisant les méthodes d'amplitude finie. Des simulations effectuées dans le champ proche montrent la bonne précision de ces solutions par rapport à celles qui nécessitent une intégration numérique.

Language: French

Document Type: Research Article

Publication date: January 1, 2002

More about this publication?
  • 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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