An experimental investigation of trailing-edge noise reduction due to elasticity

Maurício M. Nilton, Yasir A. Malik, André V.G. Cavalieri, Leandro D. de Santana, Maurício V. Donadon, William R. Wolf, Cristiano Pimenta

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

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    Abstract

    The proximity of the source and an edge can make the acoustic scattering by wings a significant source of aerodynamic sound. Theoretical results have shown that elastic edges lead to reductions of acoustic scattering; however, experimental confirmation of theoretical trends is difficult, since surface vibrations modify both the source structure and the scattering properties. A simplified, controlled setting for measurements of acoustic scattering, allowing the evaluation of fluid-structure interactions, would thus be desirable to study how elastic edges modify the radiated sound. We present an experimental procedure to isolate the scattered field using a loudspeaker in the vicinity of at plates. The methodology is applied to three different plates, made of steel, aluminum and carbon fiber, as a demonstration. The responses of these elastic plates are studied for a sound source of dipole type near the trailing edge. The method is based on the experimental determination of frequency response functions between source and radiated sound for experiments with and without the plate; subtraction of results, accounting for amplitude and phase, isolates the scattered field. Experimental results treated with the developed procedure were compared with predictions made by numerical simulations performed with a Boundary Element Method (BEM), coupling the acoustic problem with the plate vibration. The comparison between experimental and numerical results revealed that a two-dimensional model can predict satisfactorily the reductions in scattered field by elastic plates observed in the experiment. The present methods can be used to support the choice between different materials for edges focusing on their respective acoustic benefit.

    Original languageEnglish
    Title of host publication2018 AIAA/CEAS Aeroacoustics Conference
    PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
    ISBN (Print)9781624105609
    DOIs
    Publication statusPublished - 1 Jan 2018
    Event24th AIAA/CEAS Aeroacoustics Conference 2018 - Atlanta, United States
    Duration: 25 Jun 201829 Jun 2018
    Conference number: 24

    Conference

    Conference24th AIAA/CEAS Aeroacoustics Conference 2018
    Abbreviated titleAeroacoustics 2018
    CountryUnited States
    CityAtlanta
    Period25/06/1829/06/18

    Fingerprint

    Noise abatement
    Elasticity
    Acoustics
    Acoustic waves
    Scattering
    Loudspeakers
    Fluid structure interaction
    Boundary element method
    Vibrations (mechanical)
    Carbon fibers
    Frequency response
    Aerodynamics
    Demonstrations
    Experiments
    Aluminum
    Steel
    Computer simulation

    Cite this

    Nilton, M. M., Malik, Y. A., Cavalieri, A. V. G., de Santana, L. D., Donadon, M. V., Wolf, W. R., & Pimenta, C. (2018). An experimental investigation of trailing-edge noise reduction due to elasticity. In 2018 AIAA/CEAS Aeroacoustics Conference [AIAA 2018-2802] American Institute of Aeronautics and Astronautics Inc. (AIAA). https://doi.org/10.2514/6.2018-2802
    Nilton, Maurício M. ; Malik, Yasir A. ; Cavalieri, André V.G. ; de Santana, Leandro D. ; Donadon, Maurício V. ; Wolf, William R. ; Pimenta, Cristiano. / An experimental investigation of trailing-edge noise reduction due to elasticity. 2018 AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics Inc. (AIAA), 2018.
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    abstract = "The proximity of the source and an edge can make the acoustic scattering by wings a significant source of aerodynamic sound. Theoretical results have shown that elastic edges lead to reductions of acoustic scattering; however, experimental confirmation of theoretical trends is difficult, since surface vibrations modify both the source structure and the scattering properties. A simplified, controlled setting for measurements of acoustic scattering, allowing the evaluation of fluid-structure interactions, would thus be desirable to study how elastic edges modify the radiated sound. We present an experimental procedure to isolate the scattered field using a loudspeaker in the vicinity of at plates. The methodology is applied to three different plates, made of steel, aluminum and carbon fiber, as a demonstration. The responses of these elastic plates are studied for a sound source of dipole type near the trailing edge. The method is based on the experimental determination of frequency response functions between source and radiated sound for experiments with and without the plate; subtraction of results, accounting for amplitude and phase, isolates the scattered field. Experimental results treated with the developed procedure were compared with predictions made by numerical simulations performed with a Boundary Element Method (BEM), coupling the acoustic problem with the plate vibration. The comparison between experimental and numerical results revealed that a two-dimensional model can predict satisfactorily the reductions in scattered field by elastic plates observed in the experiment. The present methods can be used to support the choice between different materials for edges focusing on their respective acoustic benefit.",
    author = "Nilton, {Maur{\'i}cio M.} and Malik, {Yasir A.} and Cavalieri, {Andr{\'e} V.G.} and {de Santana}, {Leandro D.} and Donadon, {Maur{\'i}cio V.} and Wolf, {William R.} and Cristiano Pimenta",
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    Nilton, MM, Malik, YA, Cavalieri, AVG, de Santana, LD, Donadon, MV, Wolf, WR & Pimenta, C 2018, An experimental investigation of trailing-edge noise reduction due to elasticity. in 2018 AIAA/CEAS Aeroacoustics Conference., AIAA 2018-2802, American Institute of Aeronautics and Astronautics Inc. (AIAA), 24th AIAA/CEAS Aeroacoustics Conference 2018, Atlanta, United States, 25/06/18. https://doi.org/10.2514/6.2018-2802

    An experimental investigation of trailing-edge noise reduction due to elasticity. / Nilton, Maurício M.; Malik, Yasir A.; Cavalieri, André V.G.; de Santana, Leandro D.; Donadon, Maurício V.; Wolf, William R.; Pimenta, Cristiano.

    2018 AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics Inc. (AIAA), 2018. AIAA 2018-2802.

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

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    AU - Malik, Yasir A.

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    AU - de Santana, Leandro D.

    AU - Donadon, Maurício V.

    AU - Wolf, William R.

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    N2 - The proximity of the source and an edge can make the acoustic scattering by wings a significant source of aerodynamic sound. Theoretical results have shown that elastic edges lead to reductions of acoustic scattering; however, experimental confirmation of theoretical trends is difficult, since surface vibrations modify both the source structure and the scattering properties. A simplified, controlled setting for measurements of acoustic scattering, allowing the evaluation of fluid-structure interactions, would thus be desirable to study how elastic edges modify the radiated sound. We present an experimental procedure to isolate the scattered field using a loudspeaker in the vicinity of at plates. The methodology is applied to three different plates, made of steel, aluminum and carbon fiber, as a demonstration. The responses of these elastic plates are studied for a sound source of dipole type near the trailing edge. The method is based on the experimental determination of frequency response functions between source and radiated sound for experiments with and without the plate; subtraction of results, accounting for amplitude and phase, isolates the scattered field. Experimental results treated with the developed procedure were compared with predictions made by numerical simulations performed with a Boundary Element Method (BEM), coupling the acoustic problem with the plate vibration. The comparison between experimental and numerical results revealed that a two-dimensional model can predict satisfactorily the reductions in scattered field by elastic plates observed in the experiment. The present methods can be used to support the choice between different materials for edges focusing on their respective acoustic benefit.

    AB - The proximity of the source and an edge can make the acoustic scattering by wings a significant source of aerodynamic sound. Theoretical results have shown that elastic edges lead to reductions of acoustic scattering; however, experimental confirmation of theoretical trends is difficult, since surface vibrations modify both the source structure and the scattering properties. A simplified, controlled setting for measurements of acoustic scattering, allowing the evaluation of fluid-structure interactions, would thus be desirable to study how elastic edges modify the radiated sound. We present an experimental procedure to isolate the scattered field using a loudspeaker in the vicinity of at plates. The methodology is applied to three different plates, made of steel, aluminum and carbon fiber, as a demonstration. The responses of these elastic plates are studied for a sound source of dipole type near the trailing edge. The method is based on the experimental determination of frequency response functions between source and radiated sound for experiments with and without the plate; subtraction of results, accounting for amplitude and phase, isolates the scattered field. Experimental results treated with the developed procedure were compared with predictions made by numerical simulations performed with a Boundary Element Method (BEM), coupling the acoustic problem with the plate vibration. The comparison between experimental and numerical results revealed that a two-dimensional model can predict satisfactorily the reductions in scattered field by elastic plates observed in the experiment. The present methods can be used to support the choice between different materials for edges focusing on their respective acoustic benefit.

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    M3 - Conference contribution

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    SN - 9781624105609

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    PB - American Institute of Aeronautics and Astronautics Inc. (AIAA)

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    Nilton MM, Malik YA, Cavalieri AVG, de Santana LD, Donadon MV, Wolf WR et al. An experimental investigation of trailing-edge noise reduction due to elasticity. In 2018 AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics Inc. (AIAA). 2018. AIAA 2018-2802 https://doi.org/10.2514/6.2018-2802