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Acoustic source data for medium speed IC-engines
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet. VTT Technical Research Centre of Finland Ltd.
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. KTH, Skolan för industriell teknik och management (ITM), Centra, Competence Center for Gas Exchange (CCGEx).ORCID-id: 0000-0001-7898-8643
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-8474-8563
2012 (engelsk)Inngår i: Journal of Vibration and Acoustics-Transactions of the ASME, ISSN 1048-9002, E-ISSN 1528-8927, Vol. 134, nr 5, s. 051008-Artikkel i tidsskrift (Fagfellevurdert) Published
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. The goal of the present study is to numerically and experimentally investigate the medium speed IC-engine acoustic source characteristics, not only in the plane wave range but also in the high frequency range. The low frequency acoustic source characteristics were predicted by simulating the acoustic multiload measurements by using a one-dimensional process simulation code. The low frequency in-duct exhaust noise of a medium speed IC-engine can be quite accurately predicted. The high frequency source data is estimated by averaging the measured acoustic pressures with different methods; using the simple cross-spectra averaging method seems promising in this instance.

sted, utgiver, år, opplag, sider
2012. Vol. 134, nr 5, s. 051008-
Emneord [en]
Acoustic noise measurement, Acoustics, Dynamic loads, Internal combustion engines
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-105432DOI: 10.1115/1.4006415ISI: 000312366900008Scopus ID: 2-s2.0-84867299975OAI: oai:DiVA.org:kth-105432DiVA, id: diva2:571266
Forskningsfinansiär
TrenOp, Transport Research Environment with Novel Perspectives
Merknad

QC 20121122

Tilgjengelig fra: 2012-11-22 Laget: 2012-11-21 Sist oppdatert: 2017-12-07bibliografisk kontrollert
Inngår i avhandling
1. Acoustic In-duct Characterization of Fluid Machines with Applications to Medium Speed IC-engines
Åpne denne publikasjonen i ny fane eller vindu >>Acoustic In-duct Characterization of Fluid Machines with Applications to Medium Speed IC-engines
2015 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The unwanted sound, noise, can lead to health problems, e.g. hearing loss and stress-related problems. A pre-knowledge of noise generation by machines is of great importance due to the ever-shorter product development cycles and stricter noise legislation. The noise from a machine radiates to the environment indirectly via the foundation structure and directly via the surrounding fluid. A fluid machine converts the energy from the fluid into mechanical energy or vice versa. Examples of the fluid machines are internal combustion engines (IC-engines), pumps, compressors, and fans. Predicting and controlling noise from a fluid machine requires a model of the noise sources themselves, i.e. acoustic source data. In the duct systems connected to the fluid machines, the acoustic source interacts strongly with the system boundaries, and the source characteristics must be described using in-duct methods.

Above a certain frequency, i.e. first non-plane wave mode cut-on frequency, the sound pressure varies over the duct cross-section and non-plane waves are introduced. For a number of applications, the plane wave range dominates and the non-plane waves can be neglected. But for machines connected to large ducts, the non-plane wave range is also important. In the plane wave range, one-dimensional process simulation software can be used to predict, e.g. for IC-engines, the acoustic in-duct source characteristics. The high frequency phenomena with non-plane waves are so complicated, however, that it is practically impossible to simulate them accurately. Thus, in order to develop methods to estimate the sound produced, experimental studies are also essential.

This thesis investigates the acoustic in-duct source characterization of fluid machines with applications to exhaust noise from medium speed IC-engines.  This corresponds to large engines used for power plants or on ships, for which the non-plane wave range also becomes important. The plane wave source characterization methods are extended into the higher frequency range with non-plane waves. In addition, methods to determine non-plane wave range damping for typical elements in exhaust systems, e.g. after-treatment devices, are discussed.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2015. s. xi, 63
Serie
TRITA-AVE, ISSN 1651-7660 ; 2015:86
Emneord
in-duct, acoustic source, source characterization, IC-engine
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-177341 (URN)978-91-7595-765-4 (ISBN)
Disputas
2015-12-10, sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20151119

Tilgjengelig fra: 2015-11-19 Laget: 2015-11-18 Sist oppdatert: 2015-12-14bibliografisk kontrollert

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