Identification of the acoustic parameters for the variable cross-section element. Numerical and analytical methods comparison / Przemyslaw Mlynarczyk // W: Proceedings of the 26th International Congress ... więcej

Identification of the acoustic parameters for the variable cross-section element. Numerical and analytical methods comparison / Przemyslaw Mlynarczyk // W: Proceedings of the 26th International Congress on Sound and Vibration : Montreal bridges, 2019 [Dokument elektroniczny] / ed. by ICSV26 Local Committee in Montreal. – [S.l.] : Canadian Acoustical Association, 2019. – (Proceedings of the ... International Congress on Sound and Vibration, ISSN 2329-3675). – S. [1-8] : rys., tab. – Tryb dostępu: https://www.iiav.org/archives_icsv_last/2019_icsv26/content/papers/papers/full_paper_77_20190329173856361.pdf. – Oznaczenie ref./art.: 77. – Bibliogr. 12 poz., Streszcz. ang. – ISBN 978-1-9991810-0-0

Nowadays still it is a problem to introduce transfer matrix of the nozzle with variable geometry to the classical Helmholtz model to analyze it influence on the wholesystem. In the past several iden-tification ... więcej

Nowadays still it is a problem to introduce transfer matrix of the nozzle with variable geometry to the classical Helmholtz model to analyze it influence on the wholesystem. In the past several iden-tification methods were presented but some of them are too complicated for practical applications. Such a method must be reliable, easy and can’t be time-consuming. Two methods described in the literature meet all these conditions: the CFD-based identification method and analytical extension to the transfer matrix method. These methodscan be useful also to recognize the resonant frequencies for variable cross-sectiongeometries. From the other hand, nowadays the commercial software can beused to calculate various acoustic parameters for the variable cross-section elements. In this pa-per the identification of the generalized transfer matrix comparison for the nozzle-type geometry is presentedfor the analytical and CFD-basedmethod. Additionally the first resonant frequencyob-tained using three different methods are compared.