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Aerodynamic noise analysis of tilting rotor in edgewise flow conditions

Nur Syafiqah Jamaluddin Orcid Logo, Alper Celik Orcid Logo, Kabilan Baskaran Orcid Logo, Djamel Rezgui Orcid Logo, Mahdi Azarpeyvand

Journal of Sound and Vibration, Volume: 582, Start page: 118423

Swansea University Author: Alper Celik Orcid Logo

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DOI (Published version): 10.1016/j.jsv.2024.118423

Abstract

This paper presents a comprehensive experimental analysis of the noise characteristics of an isolated tilt-rotor system under edgewise flight conditions. The investigation explores the effect of rotor tilt on noise and aerodynamics using flow velocity, thrust, and far-field noise measurements. Flow...

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Published in: Journal of Sound and Vibration
ISSN: 0022-460X
Published: Elsevier BV 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa66074
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Flow field results show that as the tilting angles vary, there is a change in speed over the rotor blade surface, which influences vortex formation and wake attributes. The far-field noise spectra revealed a significant decrease in sound pressure level with increasing tilt angle, predominantly evident in both the high-amplitude tonal peaks and the broadband signal within the low-to-mid frequency range. The directivity patterns of the overall sound pressure level also demonstrated a reduction in magnitude with the tilting of the rotor. This reduction was observed consistently across all top-plane observation points, with a monopole directivity trend. Meanwhile, in the side plane array, the decrease was primarily evident above the plane of rotation with a dipole directivity pattern. The radiation direction at which the minimum sound pressure level occurs was identified near the rotation plane, irrespective of the tilt angle. Furthermore, the time-dependent noise analyses revealed dominant and persistent signal characteristics at the blade passing frequency, whereas the mid-frequency range exhibited more intermittent behaviour, and the high-frequency range indicated transient characteristics.</abstract><type>Journal Article</type><journal>Journal of Sound and Vibration</journal><volume>582</volume><journalNumber/><paginationStart>118423</paginationStart><paginationEnd/><publisher>Elsevier BV</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>0022-460X</issnPrint><issnElectronic/><keywords>Rotor noise; Aeroacoustics; Tilt rotor; Wind tunnel experiment; Urban air mobility</keywords><publishedDay>21</publishedDay><publishedMonth>7</publishedMonth><publishedYear>2024</publishedYear><publishedDate>2024-07-21</publishedDate><doi>10.1016/j.jsv.2024.118423</doi><url/><notes/><college>COLLEGE NANME</college><department>Aerospace, Civil, Electrical, and Mechanical Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>ACEM</DepartmentCode><institution>Swansea University</institution><apcterm>Another institution paid the OA fee</apcterm><funders>The first author would like to acknowledge the financial support of Majlis Amanah Rakyat Malaysia. The second author would like to acknowledge the EPSRC (Engineering and Physical Sciences Research Council) for post-doctoral sponsorship at the University of Bristol from June 2020 to December 2021 (Grant No. EP/S013024/1). 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spelling v2 66074 2024-04-17 Aerodynamic noise analysis of tilting rotor in edgewise flow conditions 3cb1f558a4b194101105e9c1e8d59cbf 0000-0002-2492-4625 Alper Celik Alper Celik true false 2024-04-17 ACEM This paper presents a comprehensive experimental analysis of the noise characteristics of an isolated tilt-rotor system under edgewise flight conditions. The investigation explores the effect of rotor tilt on noise and aerodynamics using flow velocity, thrust, and far-field noise measurements. Flow field results show that as the tilting angles vary, there is a change in speed over the rotor blade surface, which influences vortex formation and wake attributes. The far-field noise spectra revealed a significant decrease in sound pressure level with increasing tilt angle, predominantly evident in both the high-amplitude tonal peaks and the broadband signal within the low-to-mid frequency range. The directivity patterns of the overall sound pressure level also demonstrated a reduction in magnitude with the tilting of the rotor. This reduction was observed consistently across all top-plane observation points, with a monopole directivity trend. Meanwhile, in the side plane array, the decrease was primarily evident above the plane of rotation with a dipole directivity pattern. The radiation direction at which the minimum sound pressure level occurs was identified near the rotation plane, irrespective of the tilt angle. Furthermore, the time-dependent noise analyses revealed dominant and persistent signal characteristics at the blade passing frequency, whereas the mid-frequency range exhibited more intermittent behaviour, and the high-frequency range indicated transient characteristics. Journal Article Journal of Sound and Vibration 582 118423 Elsevier BV 0022-460X Rotor noise; Aeroacoustics; Tilt rotor; Wind tunnel experiment; Urban air mobility 21 7 2024 2024-07-21 10.1016/j.jsv.2024.118423 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University Another institution paid the OA fee The first author would like to acknowledge the financial support of Majlis Amanah Rakyat Malaysia. The second author would like to acknowledge the EPSRC (Engineering and Physical Sciences Research Council) for post-doctoral sponsorship at the University of Bristol from June 2020 to December 2021 (Grant No. EP/S013024/1). All authors would like to acknowledge Horizon 2020 research and innovation programme under grant agreement number 882842 (SilentProp project). 2024-05-22T11:15:29.0268316 2024-04-17T16:48:11.5575654 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering Nur Syafiqah Jamaluddin 0000-0002-3677-3481 1 Alper Celik 0000-0002-2492-4625 2 Kabilan Baskaran 0000-0003-2456-6933 3 Djamel Rezgui 0000-0002-9442-4335 4 Mahdi Azarpeyvand 5 66074__30429__a61dfc79f7394da99a444d80c2ba86ec.pdf 66074.VoR.pdf 2024-05-22T11:14:08.2591539 Output 5231642 application/pdf Version of Record true © 2024 The Author(s). This is an open access article under the CC BY license. true eng http://creativecommons.org/licenses/by/4.0/
title Aerodynamic noise analysis of tilting rotor in edgewise flow conditions
spellingShingle Aerodynamic noise analysis of tilting rotor in edgewise flow conditions
Alper Celik
title_short Aerodynamic noise analysis of tilting rotor in edgewise flow conditions
title_full Aerodynamic noise analysis of tilting rotor in edgewise flow conditions
title_fullStr Aerodynamic noise analysis of tilting rotor in edgewise flow conditions
title_full_unstemmed Aerodynamic noise analysis of tilting rotor in edgewise flow conditions
title_sort Aerodynamic noise analysis of tilting rotor in edgewise flow conditions
author_id_str_mv 3cb1f558a4b194101105e9c1e8d59cbf
author_id_fullname_str_mv 3cb1f558a4b194101105e9c1e8d59cbf_***_Alper Celik
author Alper Celik
author2 Nur Syafiqah Jamaluddin
Alper Celik
Kabilan Baskaran
Djamel Rezgui
Mahdi Azarpeyvand
format Journal article
container_title Journal of Sound and Vibration
container_volume 582
container_start_page 118423
publishDate 2024
institution Swansea University
issn 0022-460X
doi_str_mv 10.1016/j.jsv.2024.118423
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering
document_store_str 1
active_str 0
description This paper presents a comprehensive experimental analysis of the noise characteristics of an isolated tilt-rotor system under edgewise flight conditions. The investigation explores the effect of rotor tilt on noise and aerodynamics using flow velocity, thrust, and far-field noise measurements. Flow field results show that as the tilting angles vary, there is a change in speed over the rotor blade surface, which influences vortex formation and wake attributes. The far-field noise spectra revealed a significant decrease in sound pressure level with increasing tilt angle, predominantly evident in both the high-amplitude tonal peaks and the broadband signal within the low-to-mid frequency range. The directivity patterns of the overall sound pressure level also demonstrated a reduction in magnitude with the tilting of the rotor. This reduction was observed consistently across all top-plane observation points, with a monopole directivity trend. Meanwhile, in the side plane array, the decrease was primarily evident above the plane of rotation with a dipole directivity pattern. The radiation direction at which the minimum sound pressure level occurs was identified near the rotation plane, irrespective of the tilt angle. Furthermore, the time-dependent noise analyses revealed dominant and persistent signal characteristics at the blade passing frequency, whereas the mid-frequency range exhibited more intermittent behaviour, and the high-frequency range indicated transient characteristics.
published_date 2024-07-21T11:15:28Z
_version_ 1799747459696558080
score 11.016235

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