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Model-based acoustic characterisation of muffler components and extrapolation to inhomogeneous thermal conditions
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-1855-5437
2018 (English)In: Proceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics, KU Leuven - Departement Werktuigkunde , 2018, p. 3009-3020Conference paper, Published paper (Refereed)
Abstract [en]

A methodology for evaluating the acoustic behaviour of two-port inhomogeneous media in experimentally unavailable thermal conditions is proposed. The method consists of an inverse estimation of the geometrical and material properties of the object at room temperature followed by a forced thermal input. The properties of interest for the inverse estimation are the spatially-varying cross-section and/or bulk properties. The underlying model relies on a transfer matrix approach, allowing for a representation of spatially inhomogeneous objects as piece-wise equivalent homogeneous fluids, while ensuring continuity conditions between successive elements. A model of non-stationary thermal conduction is used as a first approximation, where an integral formulation accounts for the cumulative effect of multiple homogeneous elements. In order to evaluate the validity of the extrapolation, a validation against a fully numerical simulation is presented in two cases, namely a simple expansion chamber and a complex muffler. 

Place, publisher, year, edition, pages
KU Leuven - Departement Werktuigkunde , 2018. p. 3009-3020
Keywords [en]
Acoustic noise, Extrapolation, Mufflers, Structural dynamics, Transfer matrix method, Continuity conditions, Cumulative effects, Inhomogeneous media, Integral formulations, Inverse estimation, Spatially inhomogeneous, Transfer matrix approach, Varying cross section, Inverse problems
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-247428Scopus ID: 2-s2.0-85060398921ISBN: 9789073802995 (print)OAI: oai:DiVA.org:kth-247428DiVA, id: diva2:1302045
Conference
28th International Conference on Noise and Vibration Engineering, ISMA 2018 and 7th International Conference on Uncertainty in Structural Dynamics, USD 2018; Leuven; Belgium; 17 September 2018 through 19 September 2018
Note

QC20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-05-22Bibliographically approved

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Göransson, Peter

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