Acoustic source characterization for prediction of medium speed diesel engine exhaust noise

Antti Hynninen (Corresponding Author), M Åbom

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

To achieve reliable results when simulating the acoustics of the internal combustion engine (IC-engine) exhaust system and its components, the source characteristics of the engine must be known. In the low frequency range only plane waves propagate and then one-port source data can be determined using, for example, the acoustic multiload method. For the medium speed IC-engines used in power plants and ships, the exhaust duct noise often needs to be analyzed up to 10 kHz, i.e., far beyond the plane wave range, and it is then more appropriate to use acoustic power to characterize the source. This power should ideally be measured under reflection-free conditions in the exhaust duct. The results from an earlier study showed that a suitable way to characterize the source for any frequency is to determine the in-duct sound power by extending the plane wave formulation with frequency band power weighting factors. The aim of this study is to apply this high frequency range method in situ to a real test engine. Another aim is to define, theoretically, how to combine the source data in the low frequency plane wave range with those in the high frequency nonplane wave range using a source sound power formulation
Original languageEnglish
Article number021008
Number of pages8
JournalJournal of Vibration and Acoustics
Volume136
Issue number2
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

Exhaust systems (engine)
diesel engines
Acoustic noise
Diesel engines
Acoustics
acoustics
Ducts
plane waves
predictions
ducts
Engines
engines
Acoustic waves
frequency ranges
exhaust systems
engine tests
low frequencies
formulations
internal combustion engines
Frequency bands

Keywords

  • Acoustic source characteristics
  • high frequency range
  • source sound power
  • medium speed engines

Cite this

@article{c846aa10fe194f3f8119e26f4db38ef1,
title = "Acoustic source characterization for prediction of medium speed diesel engine exhaust noise",
abstract = "To achieve reliable results when simulating the acoustics of the internal combustion engine (IC-engine) exhaust system and its components, the source characteristics of the engine must be known. In the low frequency range only plane waves propagate and then one-port source data can be determined using, for example, the acoustic multiload method. For the medium speed IC-engines used in power plants and ships, the exhaust duct noise often needs to be analyzed up to 10 kHz, i.e., far beyond the plane wave range, and it is then more appropriate to use acoustic power to characterize the source. This power should ideally be measured under reflection-free conditions in the exhaust duct. The results from an earlier study showed that a suitable way to characterize the source for any frequency is to determine the in-duct sound power by extending the plane wave formulation with frequency band power weighting factors. The aim of this study is to apply this high frequency range method in situ to a real test engine. Another aim is to define, theoretically, how to combine the source data in the low frequency plane wave range with those in the high frequency nonplane wave range using a source sound power formulation",
keywords = "Acoustic source characteristics, high frequency range, source sound power, medium speed engines",
author = "Antti Hynninen and M {\AA}bom",
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year = "2014",
doi = "10.1115/1.4026138",
language = "English",
volume = "136",
journal = "Journal of Vibration and Acoustics",
issn = "1048-9002",
publisher = "American Society of Mechanical Engineers ASME",
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}

Acoustic source characterization for prediction of medium speed diesel engine exhaust noise. / Hynninen, Antti (Corresponding Author); Åbom, M.

In: Journal of Vibration and Acoustics, Vol. 136, No. 2, 021008, 2014.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Acoustic source characterization for prediction of medium speed diesel engine exhaust noise

AU - Hynninen, Antti

AU - Åbom, M

N1 - Project code: 82112

PY - 2014

Y1 - 2014

N2 - To achieve reliable results when simulating the acoustics of the internal combustion engine (IC-engine) exhaust system and its components, the source characteristics of the engine must be known. In the low frequency range only plane waves propagate and then one-port source data can be determined using, for example, the acoustic multiload method. For the medium speed IC-engines used in power plants and ships, the exhaust duct noise often needs to be analyzed up to 10 kHz, i.e., far beyond the plane wave range, and it is then more appropriate to use acoustic power to characterize the source. This power should ideally be measured under reflection-free conditions in the exhaust duct. The results from an earlier study showed that a suitable way to characterize the source for any frequency is to determine the in-duct sound power by extending the plane wave formulation with frequency band power weighting factors. The aim of this study is to apply this high frequency range method in situ to a real test engine. Another aim is to define, theoretically, how to combine the source data in the low frequency plane wave range with those in the high frequency nonplane wave range using a source sound power formulation

AB - To achieve reliable results when simulating the acoustics of the internal combustion engine (IC-engine) exhaust system and its components, the source characteristics of the engine must be known. In the low frequency range only plane waves propagate and then one-port source data can be determined using, for example, the acoustic multiload method. For the medium speed IC-engines used in power plants and ships, the exhaust duct noise often needs to be analyzed up to 10 kHz, i.e., far beyond the plane wave range, and it is then more appropriate to use acoustic power to characterize the source. This power should ideally be measured under reflection-free conditions in the exhaust duct. The results from an earlier study showed that a suitable way to characterize the source for any frequency is to determine the in-duct sound power by extending the plane wave formulation with frequency band power weighting factors. The aim of this study is to apply this high frequency range method in situ to a real test engine. Another aim is to define, theoretically, how to combine the source data in the low frequency plane wave range with those in the high frequency nonplane wave range using a source sound power formulation

KW - Acoustic source characteristics

KW - high frequency range

KW - source sound power

KW - medium speed engines

U2 - 10.1115/1.4026138

DO - 10.1115/1.4026138

M3 - Article

VL - 136

JO - Journal of Vibration and Acoustics

JF - Journal of Vibration and Acoustics

SN - 1048-9002

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M1 - 021008

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