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A development on fast frequency sweep methods for acoustic radiation problems
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-6555-531X
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0003-1855-5437
2016 (English)In: Proceedings of ISMA 2016 - International Conference on Noise and Vibration Engineering and USD2016 - International Conference on Uncertainty in Structural Dynamics, KU Leuven, Departement Werktuigkunde , 2016, p. 521-533Conference paper, Published paper (Refereed)
Abstract [en]

The direct point by point swept solution of the discretised Helmholtz equation over a broad frequency range can become computationally expensive for large systems when fine frequency increments are required. Approaches involving reduced-order models using Padé-or waveform-based methods such as the well conditioned asymptotic waveform evaluation (WCAWE) can be used to significantly reduce this and can also be applied to systems with non-quadratic frequency dependency. In this paper WCAWE expansions are performed on a finite element based dynamical model of a two microphone open flanged impedance tube test. The use of an approximate loss-factor-based PML type approach to model the radiating section of the system is considered which eliminates dependency on reciprocal frequency terms. This allows for an efficient high order expansion as the frequency derivative terms need to be retained only up to second order. It is then shown that the method efficiently gives robust predictions of the end impedance with simple non-specialized elements.

Place, publisher, year, edition, pages
KU Leuven, Departement Werktuigkunde , 2016. p. 521-533
Keyword [en]
Acoustic impedance, Structural dynamics, Acoustic radiation, Asymptotic waveform evaluation, Broad frequency range, Frequency dependencies, Frequency increments, Reduced order models, Robust predictions, Two microphones, Finite element method
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-216876ISI: 000392486301003Scopus ID: 2-s2.0-85018176132ISBN: 9789073802940 OAI: oai:DiVA.org:kth-216876DiVA, id: diva2:1154006
Conference
27th International Conference on Noise and Vibration Engineering, ISMA 2016 and International Conference on Uncertainty in Structural Dynamics, USD2016, 19 September 2016 through 21 September 2016
Note

Conference code: 127077; Export Date: 24 October 2017; Conference Paper. QC 20171101

Available from: 2017-11-01 Created: 2017-11-01 Last updated: 2018-03-06Bibliographically approved

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