Sound propagation in range‐degendent double ducts
نویسندگان
چکیده
منابع مشابه
An improved multimodal method for sound propagation in nonuniform lined ducts.
An efficient method is proposed for modeling time harmonic acoustic propagation in a nonuniform lined duct without flow. The lining impedance is axially segmented uniform, but varies circumferentially. The sound pressure is expanded in term of rigid duct modes and an additional function that carries the information about the impedance boundary. The rigid duct modes and the additional function a...
متن کاملSound propagation in slowly varying lined flow ducts of arbitrary cross section
Sound transmission through ducts of constant cross section with a uniform inviscid mean flow and a constant acoustic lining (impedance wall) is classically described by a modal expansion, where the modes are eigenfunctions of the corresponding Laplace eigenvalue problem along a duct cross section. A natural extension for ducts with cross section and wall impedance that are varying slowly (compa...
متن کاملAnalysis of Sound Propagation in Lined Ducts by means of a Finite Element Model
The present paper describes the results of a Finite Element Model used to analize sound propagation in lined ducts. By means of a numerical model it was possible to predict the insertion loss inside rectangular lined ducts in a frequency range from 250 Hz to 4000 Hz. The model was validated by a comparison with experimental data obtained in accordance to ISO 11691 and ISO 7235 standards. The so...
متن کاملContributions to the Theory of Sound Propagation in Ducts with Bulk-reacting Lining
(Received 26 February 1984; accepted for publication 20 November 1984) A theoretical nalysis ofsound propagation in cylindrical ducts lined with porous material {bulk absorbers) is presented. Three configurations are discussed. (1) The porous material is homogeneous; thenthe sound field is built up of modes. (2) The properties of the liner vary slowly in an axial direction. A pure modal solutio...
متن کاملAn improved multimodal method for sound propagation in ducts lined with bulk reacting linings
Over the years, the sound attenuation provided by ducts with bulk reacting lining has been widely investigated in the literature. Numerous models exist. Each of them presents assets and limitations according to the geometry of the studied problem. For a complete review of the methods, we refer to the recent articles of Kirby [7] and Panigrahi et al. [12] and the references therein. The methods ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1984
ISSN: 0001-4966
DOI: 10.1121/1.2021837