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

57 Downloads (Pure)

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.
@inproceedings{a55be6cd995a419da6cc5434af77ff2f,
title = "An experimental investigation of trailing-edge noise reduction due to elasticity",
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",
year = "2018",
month = "1",
day = "1",
doi = "10.2514/6.2018-2802",
language = "English",
isbn = "9781624105609",
booktitle = "2018 AIAA/CEAS Aeroacoustics Conference",
publisher = "American Institute of Aeronautics and Astronautics Inc. (AIAA)",
address = "United States",

}

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

TY - GEN

T1 - An experimental investigation of trailing-edge noise reduction due to elasticity

AU - Nilton, Maurício M.

AU - Malik, Yasir A.

AU - Cavalieri, André V.G.

AU - de Santana, Leandro D.

AU - Donadon, Maurício V.

AU - Wolf, William R.

AU - Pimenta, Cristiano

PY - 2018/1/1

Y1 - 2018/1/1

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.

UR - http://www.scopus.com/inward/record.url?scp=85051299665&partnerID=8YFLogxK

U2 - 10.2514/6.2018-2802

DO - 10.2514/6.2018-2802

M3 - Conference contribution

SN - 9781624105609

BT - 2018 AIAA/CEAS Aeroacoustics Conference

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

ER -

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