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Acoustic source data for medium speed IC-engines
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).ORCID iD: 0000-0001-7898-8643
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).ORCID iD: 0000-0002-8474-8563
2011 (English)In: 18th International Congress on Sound and Vibration 2011 (ICSV 18), 2011, 811-818 p.Conference paper, Published paper (Refereed)
Abstract [en]

Knowledge of the acoustic source characteristics of internal combustion engines (IC-engines) is of great importance when designing the exhaust duct system and its components to withstand the resulting dynamic loads and to reduce the exhaust noise emission. Number of studies has been published earlier on the low frequency in-duct exhaust noise of high speed engines. The goal of the present study is to investigate the medium speed IC-engine acoustic source characteristics numerically and experimentally not only in the low frequency - plane wave range but also in the high frequency range. The low frequency acoustic source characteristics were predicted by simulating the acoustic multi-load measurements using a one-dimensional process simulation code. The engine model used in the one-dimensional process simulations was validated with measurements. In this study, it is shown that the low frequency in-duct exhaust noise of a medium speed IC-engine can be predicted quite accurately by using a onedimensional process simulation code. The high frequency source data is estimated by averaging the measured acoustic pressures with different methods. According to this study, using the simple cross spectra averaging method instead of two microphone method to estimate the induct downstream acoustic power of medium speed IC-engine exhaust noise seems promising. The simulation of the high frequency exhaust noise is beyond this study.

Place, publisher, year, edition, pages
2011. 811-818 p.
Keyword [en]
Acoustic power, Acoustic pressures, Acoustic sources, Averaging method, Cross spectra, Engine models, Exhaust duct system, Exhaust noise, High frequency, High-speed engines, Low frequency acoustic, Plane wave, Process simulations, Two-microphone methods, Acoustic noise measurement, Acoustics, Computer simulation, Dynamic loads, Exhaust systems (engine), Internal combustion engines, Acoustic noise
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-148739Scopus ID: 2-s2.0-84871516398ISBN: 9781618392596 (print)OAI: oai:DiVA.org:kth-148739DiVA: diva2:740739
Conference
18th International Congress on Sound and Vibration 2011, ICSV 2011, 10 July 2011 through 14 July 2011, Rio de Janeiro, Brazil
Note

QC 20140826

Available from: 2014-08-26 Created: 2014-08-11 Last updated: 2014-11-17Bibliographically approved

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Åbom, MatsBodén, Hans

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