Procedure to estimate the in-duct sound power in the high frequency range with non-plane waves

Antti Hynninen, M. Åbom

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

    3 Citations (Scopus)

    Abstract

    The acoustic characterization of fluid machines, e.g., internal combustion engines, compressors, or fans is of great importance when designing the connected duct systems and its silencers. For machines connected to large ducts where also the non-plane wave range is important, for instance large diesels and gas turbines, a suitable way to characterize the source is to determine the sound power under reflection free conditions. For the low frequency plane wave range in-duct sound power can be measured with the widely used two microphone method. The goal of this study is to investigate how, starting from the two-microphone approach, a suitable wall mounted microphone configuration can be defined and used to estimate the propagating in-duct sound power also beyond the plane wave range. For this purpose an acoustic source test-rig was built and numerical simulations were also conducted. The in-duct sound power from monopole, dipole, and quadrupole source types was determined using twelve wall mounted microphones and cross-spectra averaging methods. The in-duct results were compared against sound power measured using the reverberation room method (ISO 3741). Based on the simulations and the experimental results the best microphone positions and weighting factors were determined
    Original languageEnglish
    Title of host publicationProceedings ASME 2012 Noise Control and Acoustics Division Conference
    PublisherAmerican Society of Mechanical Engineers ASME
    Pages181 - 191
    ISBN (Print)978-0-7918-4532-5
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA4 Article in a conference publication
    Event41st International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2012: Noise Control and Acoustics Division Conference - New York, United States
    Duration: 19 Aug 201222 Aug 2012

    Conference

    Conference41st International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2012
    Abbreviated titleINTER-NOISE
    CountryUnited States
    CityNew York
    Period19/08/1222/08/12

    Fingerprint

    ducts
    frequency ranges
    microphones
    acoustics
    estimates
    plane waves
    silencers
    internal combustion engines
    gas turbines
    reverberation
    turbines
    compressors
    fans
    monopoles
    rooms
    simulation
    quadrupoles
    dipoles
    low frequencies
    fluids

    Keywords

    • Acoustic characterization
    • high frequency range
    • non-plane waves

    Cite this

    Hynninen, A., & Åbom, M. (2012). Procedure to estimate the in-duct sound power in the high frequency range with non-plane waves. In Proceedings ASME 2012 Noise Control and Acoustics Division Conference (pp. 181 - 191). [NCAD2012-0531] American Society of Mechanical Engineers ASME. https://doi.org/10.1115/NCAD2012-0531
    Hynninen, Antti ; Åbom, M. / Procedure to estimate the in-duct sound power in the high frequency range with non-plane waves. Proceedings ASME 2012 Noise Control and Acoustics Division Conference . American Society of Mechanical Engineers ASME, 2012. pp. 181 - 191
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    title = "Procedure to estimate the in-duct sound power in the high frequency range with non-plane waves",
    abstract = "The acoustic characterization of fluid machines, e.g., internal combustion engines, compressors, or fans is of great importance when designing the connected duct systems and its silencers. For machines connected to large ducts where also the non-plane wave range is important, for instance large diesels and gas turbines, a suitable way to characterize the source is to determine the sound power under reflection free conditions. For the low frequency plane wave range in-duct sound power can be measured with the widely used two microphone method. The goal of this study is to investigate how, starting from the two-microphone approach, a suitable wall mounted microphone configuration can be defined and used to estimate the propagating in-duct sound power also beyond the plane wave range. For this purpose an acoustic source test-rig was built and numerical simulations were also conducted. The in-duct sound power from monopole, dipole, and quadrupole source types was determined using twelve wall mounted microphones and cross-spectra averaging methods. The in-duct results were compared against sound power measured using the reverberation room method (ISO 3741). Based on the simulations and the experimental results the best microphone positions and weighting factors were determined",
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    Hynninen, A & Åbom, M 2012, Procedure to estimate the in-duct sound power in the high frequency range with non-plane waves. in Proceedings ASME 2012 Noise Control and Acoustics Division Conference ., NCAD2012-0531, American Society of Mechanical Engineers ASME, pp. 181 - 191, 41st International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2012, New York, United States, 19/08/12. https://doi.org/10.1115/NCAD2012-0531

    Procedure to estimate the in-duct sound power in the high frequency range with non-plane waves. / Hynninen, Antti; Åbom, M.

    Proceedings ASME 2012 Noise Control and Acoustics Division Conference . American Society of Mechanical Engineers ASME, 2012. p. 181 - 191 NCAD2012-0531.

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

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    N2 - The acoustic characterization of fluid machines, e.g., internal combustion engines, compressors, or fans is of great importance when designing the connected duct systems and its silencers. For machines connected to large ducts where also the non-plane wave range is important, for instance large diesels and gas turbines, a suitable way to characterize the source is to determine the sound power under reflection free conditions. For the low frequency plane wave range in-duct sound power can be measured with the widely used two microphone method. The goal of this study is to investigate how, starting from the two-microphone approach, a suitable wall mounted microphone configuration can be defined and used to estimate the propagating in-duct sound power also beyond the plane wave range. For this purpose an acoustic source test-rig was built and numerical simulations were also conducted. The in-duct sound power from monopole, dipole, and quadrupole source types was determined using twelve wall mounted microphones and cross-spectra averaging methods. The in-duct results were compared against sound power measured using the reverberation room method (ISO 3741). Based on the simulations and the experimental results the best microphone positions and weighting factors were determined

    AB - The acoustic characterization of fluid machines, e.g., internal combustion engines, compressors, or fans is of great importance when designing the connected duct systems and its silencers. For machines connected to large ducts where also the non-plane wave range is important, for instance large diesels and gas turbines, a suitable way to characterize the source is to determine the sound power under reflection free conditions. For the low frequency plane wave range in-duct sound power can be measured with the widely used two microphone method. The goal of this study is to investigate how, starting from the two-microphone approach, a suitable wall mounted microphone configuration can be defined and used to estimate the propagating in-duct sound power also beyond the plane wave range. For this purpose an acoustic source test-rig was built and numerical simulations were also conducted. The in-duct sound power from monopole, dipole, and quadrupole source types was determined using twelve wall mounted microphones and cross-spectra averaging methods. The in-duct results were compared against sound power measured using the reverberation room method (ISO 3741). Based on the simulations and the experimental results the best microphone positions and weighting factors were determined

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    Hynninen A, Åbom M. Procedure to estimate the in-duct sound power in the high frequency range with non-plane waves. In Proceedings ASME 2012 Noise Control and Acoustics Division Conference . American Society of Mechanical Engineers ASME. 2012. p. 181 - 191. NCAD2012-0531 https://doi.org/10.1115/NCAD2012-0531