Measurement and simulation study of an exhaust system noise complaint

Erin Komi, Z. Gao, J. Hartikainen, K. Saine, J. Jacqmot, X. Robin

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

A noise complaint was issued during a 1000 hour endurance test for a Wärtsilä W32E engine with cylinder pressure 235 bar. Sound measurements were taken, and the cause of the complaint was determined to be the first stage exhaust silencer, which radiates noise in the 100 Hz third-octave band (i.e. engine order 7.5). Actran finite element software was used to create a vibro- Acoustic model of the exhaust silencer in order to investigate the noise problem identified as occurring at 94 Hz. The simulations indicated that a combination of factors resulted in the noise problem; the engine load, which determines the temperature in the ductwork and silencer, the engine speed, which determines the engine order frequencies that are excited, and the length of the duct leading to the silencer, having a resonance at 94 Hz if engine load is at 100%. Several potential silencer modifications were simulated, and an extension of the silencer inlet was proposed. The silencer was thus modified, and the sound measurements were repeated. The result was a 10 dB decrease in total sound level measured around the silencer exterior.
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publication 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013
Place of PublicationRed Hook, NY, USA
PublisherCurran Associates Inc.
Pages5792-5800
ISBN (Print)978-163266267-5
Publication statusPublished - 2013
MoE publication typeNot Eligible
Event42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life - Innsbruck, Austria
Duration: 15 Sep 201318 Sep 2013

Publication series

Name
Volume7

Conference

Conference42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013
Abbreviated titleINTER-NOISE
CountryAustria
CityInnsbruck
Period15/09/1318/09/13

Fingerprint

exhaust systems
silencers
engines
simulation
acoustic measurement
acoustics
endurance
octaves
ducts
computer programs
causes

Keywords

  • engine exhaust noise
  • finite element method
  • vibro-acoustic simulation

Cite this

Komi, E., Gao, Z., Hartikainen, J., Saine, K., Jacqmot, J., & Robin, X. (2013). Measurement and simulation study of an exhaust system noise complaint. In Proceedings: 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013 (pp. 5792-5800). Red Hook, NY, USA: Curran Associates Inc..
Komi, Erin ; Gao, Z. ; Hartikainen, J. ; Saine, K. ; Jacqmot, J. ; Robin, X. / Measurement and simulation study of an exhaust system noise complaint. Proceedings: 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013. Red Hook, NY, USA : Curran Associates Inc., 2013. pp. 5792-5800
@inproceedings{c544775129b34366994b98e1e89766fa,
title = "Measurement and simulation study of an exhaust system noise complaint",
abstract = "A noise complaint was issued during a 1000 hour endurance test for a W{\"a}rtsil{\"a} W32E engine with cylinder pressure 235 bar. Sound measurements were taken, and the cause of the complaint was determined to be the first stage exhaust silencer, which radiates noise in the 100 Hz third-octave band (i.e. engine order 7.5). Actran finite element software was used to create a vibro- Acoustic model of the exhaust silencer in order to investigate the noise problem identified as occurring at 94 Hz. The simulations indicated that a combination of factors resulted in the noise problem; the engine load, which determines the temperature in the ductwork and silencer, the engine speed, which determines the engine order frequencies that are excited, and the length of the duct leading to the silencer, having a resonance at 94 Hz if engine load is at 100{\%}. Several potential silencer modifications were simulated, and an extension of the silencer inlet was proposed. The silencer was thus modified, and the sound measurements were repeated. The result was a 10 dB decrease in total sound level measured around the silencer exterior.",
keywords = "engine exhaust noise, finite element method, vibro-acoustic simulation",
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year = "2013",
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Komi, E, Gao, Z, Hartikainen, J, Saine, K, Jacqmot, J & Robin, X 2013, Measurement and simulation study of an exhaust system noise complaint. in Proceedings: 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013. Curran Associates Inc., Red Hook, NY, USA, pp. 5792-5800, 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013, Innsbruck, Austria, 15/09/13.

Measurement and simulation study of an exhaust system noise complaint. / Komi, Erin; Gao, Z.; Hartikainen, J.; Saine, K.; Jacqmot, J.; Robin, X.

Proceedings: 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013. Red Hook, NY, USA : Curran Associates Inc., 2013. p. 5792-5800.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Measurement and simulation study of an exhaust system noise complaint

AU - Komi, Erin

AU - Gao, Z.

AU - Hartikainen, J.

AU - Saine, K.

AU - Jacqmot, J.

AU - Robin, X.

PY - 2013

Y1 - 2013

N2 - A noise complaint was issued during a 1000 hour endurance test for a Wärtsilä W32E engine with cylinder pressure 235 bar. Sound measurements were taken, and the cause of the complaint was determined to be the first stage exhaust silencer, which radiates noise in the 100 Hz third-octave band (i.e. engine order 7.5). Actran finite element software was used to create a vibro- Acoustic model of the exhaust silencer in order to investigate the noise problem identified as occurring at 94 Hz. The simulations indicated that a combination of factors resulted in the noise problem; the engine load, which determines the temperature in the ductwork and silencer, the engine speed, which determines the engine order frequencies that are excited, and the length of the duct leading to the silencer, having a resonance at 94 Hz if engine load is at 100%. Several potential silencer modifications were simulated, and an extension of the silencer inlet was proposed. The silencer was thus modified, and the sound measurements were repeated. The result was a 10 dB decrease in total sound level measured around the silencer exterior.

AB - A noise complaint was issued during a 1000 hour endurance test for a Wärtsilä W32E engine with cylinder pressure 235 bar. Sound measurements were taken, and the cause of the complaint was determined to be the first stage exhaust silencer, which radiates noise in the 100 Hz third-octave band (i.e. engine order 7.5). Actran finite element software was used to create a vibro- Acoustic model of the exhaust silencer in order to investigate the noise problem identified as occurring at 94 Hz. The simulations indicated that a combination of factors resulted in the noise problem; the engine load, which determines the temperature in the ductwork and silencer, the engine speed, which determines the engine order frequencies that are excited, and the length of the duct leading to the silencer, having a resonance at 94 Hz if engine load is at 100%. Several potential silencer modifications were simulated, and an extension of the silencer inlet was proposed. The silencer was thus modified, and the sound measurements were repeated. The result was a 10 dB decrease in total sound level measured around the silencer exterior.

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KW - finite element method

KW - vibro-acoustic simulation

M3 - Conference article in proceedings

SN - 978-163266267-5

SP - 5792

EP - 5800

BT - Proceedings

PB - Curran Associates Inc.

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Komi E, Gao Z, Hartikainen J, Saine K, Jacqmot J, Robin X. Measurement and simulation study of an exhaust system noise complaint. In Proceedings: 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013. Red Hook, NY, USA: Curran Associates Inc. 2013. p. 5792-5800