Acoustic source characterization of medium speed IC-engine exhaust system

Antti Hynninen, Mats Åbom, M. Aura, H. Boden, E. Nousiainen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

Abstract

Due to the tightening demands concerning the environmental noise, knowledge of the sound generation of internal combustion engines (IC-engines) is of great importance. The exhaust noise of an IC-engine travels from the source via transmission path, exhaust system, to the outside environment. When designing the elements used in IC-engine exhaust systems, e.g., silencers or catalytic converters to reduce the exhaust emissions, including noise, the acoustic source characteristics of the IC-engine must be known. The studied audio frequency range can be divided into the low frequency plane wave range and high frequency non-plane wave range. The low frequency plane wave range acoustic source characteristics of an IC-engine can be determined accurately by using for example process simulation software and acoustic multi-load methods. If the diameter of the studied duct is small as in automotive systems, the low frequency plane wave range source characterization might be enough. When studying noise from a large power plant or marine IC-engine, the duct diameters are large and therefore the acoustic source characteristics in the high frequency non-plane wave range are also important. The goal of this study is to estimate how the acoustic source data of a medium speed IC-engine exhaust system can be determined in the low frequency plane wave range and also in the high frequency non-plane wave range using engineering practices and acoustic power based methods. In this study the source characteristics are determined based on simulations and measurements, then the low- and high frequency source characteristics are combined in a way that allows them to be used in multi-port simulations.
Original languageEnglish
Title of host publicationCIMAC Technical Paper Database
Number of pages8
Publication statusPublished - 2013
MoE publication typeD3 Professional conference proceedings
Event27th CIMAC World Congress on Combustion Engine Technology - Shanghai, China
Duration: 13 May 201316 May 2013

Conference

Conference27th CIMAC World Congress on Combustion Engine Technology
Abbreviated titleCIMAC 2013
CountryChina
CityShanghai
Period13/05/1316/05/13

Fingerprint

exhaust systems
internal combustion engines
acoustics
low frequencies
plane waves
ducts
frequency ranges
exhaust emission
silencers
audio frequencies
simulation
power plants
travel
converters
engineering
computer programs

Keywords

  • acoustic source characteristics
  • medium speed IC-engine
  • exhaust system

Cite this

Hynninen, A., Åbom, M., Aura, M., Boden, H., & Nousiainen, E. (2013). Acoustic source characterization of medium speed IC-engine exhaust system. In CIMAC Technical Paper Database
Hynninen, Antti ; Åbom, Mats ; Aura, M. ; Boden, H. ; Nousiainen, E. / Acoustic source characterization of medium speed IC-engine exhaust system. CIMAC Technical Paper Database. 2013.
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abstract = "Due to the tightening demands concerning the environmental noise, knowledge of the sound generation of internal combustion engines (IC-engines) is of great importance. The exhaust noise of an IC-engine travels from the source via transmission path, exhaust system, to the outside environment. When designing the elements used in IC-engine exhaust systems, e.g., silencers or catalytic converters to reduce the exhaust emissions, including noise, the acoustic source characteristics of the IC-engine must be known. The studied audio frequency range can be divided into the low frequency plane wave range and high frequency non-plane wave range. The low frequency plane wave range acoustic source characteristics of an IC-engine can be determined accurately by using for example process simulation software and acoustic multi-load methods. If the diameter of the studied duct is small as in automotive systems, the low frequency plane wave range source characterization might be enough. When studying noise from a large power plant or marine IC-engine, the duct diameters are large and therefore the acoustic source characteristics in the high frequency non-plane wave range are also important. The goal of this study is to estimate how the acoustic source data of a medium speed IC-engine exhaust system can be determined in the low frequency plane wave range and also in the high frequency non-plane wave range using engineering practices and acoustic power based methods. In this study the source characteristics are determined based on simulations and measurements, then the low- and high frequency source characteristics are combined in a way that allows them to be used in multi-port simulations.",
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Hynninen, A, Åbom, M, Aura, M, Boden, H & Nousiainen, E 2013, Acoustic source characterization of medium speed IC-engine exhaust system. in CIMAC Technical Paper Database. 27th CIMAC World Congress on Combustion Engine Technology, Shanghai, China, 13/05/13.

Acoustic source characterization of medium speed IC-engine exhaust system. / Hynninen, Antti; Åbom, Mats; Aura, M.; Boden, H.; Nousiainen, E.

CIMAC Technical Paper Database. 2013.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

TY - GEN

T1 - Acoustic source characterization of medium speed IC-engine exhaust system

AU - Hynninen, Antti

AU - Åbom, Mats

AU - Aura, M.

AU - Boden, H.

AU - Nousiainen, E.

N1 - Project: 82112

PY - 2013

Y1 - 2013

N2 - Due to the tightening demands concerning the environmental noise, knowledge of the sound generation of internal combustion engines (IC-engines) is of great importance. The exhaust noise of an IC-engine travels from the source via transmission path, exhaust system, to the outside environment. When designing the elements used in IC-engine exhaust systems, e.g., silencers or catalytic converters to reduce the exhaust emissions, including noise, the acoustic source characteristics of the IC-engine must be known. The studied audio frequency range can be divided into the low frequency plane wave range and high frequency non-plane wave range. The low frequency plane wave range acoustic source characteristics of an IC-engine can be determined accurately by using for example process simulation software and acoustic multi-load methods. If the diameter of the studied duct is small as in automotive systems, the low frequency plane wave range source characterization might be enough. When studying noise from a large power plant or marine IC-engine, the duct diameters are large and therefore the acoustic source characteristics in the high frequency non-plane wave range are also important. The goal of this study is to estimate how the acoustic source data of a medium speed IC-engine exhaust system can be determined in the low frequency plane wave range and also in the high frequency non-plane wave range using engineering practices and acoustic power based methods. In this study the source characteristics are determined based on simulations and measurements, then the low- and high frequency source characteristics are combined in a way that allows them to be used in multi-port simulations.

AB - Due to the tightening demands concerning the environmental noise, knowledge of the sound generation of internal combustion engines (IC-engines) is of great importance. The exhaust noise of an IC-engine travels from the source via transmission path, exhaust system, to the outside environment. When designing the elements used in IC-engine exhaust systems, e.g., silencers or catalytic converters to reduce the exhaust emissions, including noise, the acoustic source characteristics of the IC-engine must be known. The studied audio frequency range can be divided into the low frequency plane wave range and high frequency non-plane wave range. The low frequency plane wave range acoustic source characteristics of an IC-engine can be determined accurately by using for example process simulation software and acoustic multi-load methods. If the diameter of the studied duct is small as in automotive systems, the low frequency plane wave range source characterization might be enough. When studying noise from a large power plant or marine IC-engine, the duct diameters are large and therefore the acoustic source characteristics in the high frequency non-plane wave range are also important. The goal of this study is to estimate how the acoustic source data of a medium speed IC-engine exhaust system can be determined in the low frequency plane wave range and also in the high frequency non-plane wave range using engineering practices and acoustic power based methods. In this study the source characteristics are determined based on simulations and measurements, then the low- and high frequency source characteristics are combined in a way that allows them to be used in multi-port simulations.

KW - acoustic source characteristics

KW - medium speed IC-engine

KW - exhaust system

M3 - Conference article in proceedings

BT - CIMAC Technical Paper Database

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Hynninen A, Åbom M, Aura M, Boden H, Nousiainen E. Acoustic source characterization of medium speed IC-engine exhaust system. In CIMAC Technical Paper Database. 2013