Hydrodynamic Noise from Flexible Roughness Elements
The influence of a poroelastic surface structure composed of elastic fibers, as inspired by the wings of silent owl species, is investigated theoretically through the development of two mathematical models. First, in the spatial limit of a sparse distribution of fibers that are hydrodynamically unco...
Gespeichert in:
| Hauptverfasser: | , , |
|---|---|
| Format: | Report |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext bestellen |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | |
|---|---|
| container_issue | |
| container_start_page | |
| container_title | |
| container_volume | |
| creator | Jaworski, Justin W Daly, Conor Peake, Nigel |
| description | The influence of a poroelastic surface structure composed of elastic fibers, as inspired by the wings of silent owl species, is investigated theoretically through the development of two mathematical models. First, in the spatial limit of a sparse distribution of fibers that are hydrodynamically uncoupled, the influences of fiber bending and a background flow on the far field sound are studied using conformal mapping. A second model reveals how the porous surface structure can suppress pressure fluctuations, which agrees well with companion experiments performed by Dr. William Devenport of Virginia Tech.
Work supported in collaboration with NICOP grant N62909-12-1-7116 awarded to the University of Cambridge |
| format | Report |
| fullrecord | <record><control><sourceid>dtic_1RU</sourceid><recordid>TN_cdi_dtic_stinet_ADA622149</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>ADA622149</sourcerecordid><originalsourceid>FETCH-dtic_stinet_ADA6221493</originalsourceid><addsrcrecordid>eNrjZDD2qEwpyk-pzEvMzUxW8MvPLE5VSCvKz1Vwy0mtyEzKSVUIyi9Nz8hLLS5WcM1JzU3NKynmYWBNS8wpTuWF0twMMm6uIc4euiklmcnxxSWZeakl8Y4ujmZGRoYmlsYEpAFObSmp</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>report</recordtype></control><display><type>report</type><title>Hydrodynamic Noise from Flexible Roughness Elements</title><source>DTIC Technical Reports</source><creator>Jaworski, Justin W ; Daly, Conor ; Peake, Nigel</creator><creatorcontrib>Jaworski, Justin W ; Daly, Conor ; Peake, Nigel ; LEHIGH UNIV BETHLEHEM PA</creatorcontrib><description>The influence of a poroelastic surface structure composed of elastic fibers, as inspired by the wings of silent owl species, is investigated theoretically through the development of two mathematical models. First, in the spatial limit of a sparse distribution of fibers that are hydrodynamically uncoupled, the influences of fiber bending and a background flow on the far field sound are studied using conformal mapping. A second model reveals how the porous surface structure can suppress pressure fluctuations, which agrees well with companion experiments performed by Dr. William Devenport of Virginia Tech.
Work supported in collaboration with NICOP grant N62909-12-1-7116 awarded to the University of Cambridge</description><language>eng</language><subject>ACOUSTIC SIGNATURES ; Acoustics ; CONFORMAL MAPPING ; FEATHERS ; FLEXIBLE ROUGNNESS ; HYDRODYNAMICS ; KELVIN-HELMHOLTZ INSTABILITY ; NOISE ; POROUS CANOPY ; SURFACE ROUGHNESS ; VORTEX SOUND ; WINGS</subject><creationdate>2015</creationdate><rights>Approved for public release; distribution is unlimited.</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,780,885,27567,27568</link.rule.ids><linktorsrc>$$Uhttps://apps.dtic.mil/sti/citations/ADA622149$$EView_record_in_DTIC$$FView_record_in_$$GDTIC$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Jaworski, Justin W</creatorcontrib><creatorcontrib>Daly, Conor</creatorcontrib><creatorcontrib>Peake, Nigel</creatorcontrib><creatorcontrib>LEHIGH UNIV BETHLEHEM PA</creatorcontrib><title>Hydrodynamic Noise from Flexible Roughness Elements</title><description>The influence of a poroelastic surface structure composed of elastic fibers, as inspired by the wings of silent owl species, is investigated theoretically through the development of two mathematical models. First, in the spatial limit of a sparse distribution of fibers that are hydrodynamically uncoupled, the influences of fiber bending and a background flow on the far field sound are studied using conformal mapping. A second model reveals how the porous surface structure can suppress pressure fluctuations, which agrees well with companion experiments performed by Dr. William Devenport of Virginia Tech.
Work supported in collaboration with NICOP grant N62909-12-1-7116 awarded to the University of Cambridge</description><subject>ACOUSTIC SIGNATURES</subject><subject>Acoustics</subject><subject>CONFORMAL MAPPING</subject><subject>FEATHERS</subject><subject>FLEXIBLE ROUGNNESS</subject><subject>HYDRODYNAMICS</subject><subject>KELVIN-HELMHOLTZ INSTABILITY</subject><subject>NOISE</subject><subject>POROUS CANOPY</subject><subject>SURFACE ROUGHNESS</subject><subject>VORTEX SOUND</subject><subject>WINGS</subject><fulltext>true</fulltext><rsrctype>report</rsrctype><creationdate>2015</creationdate><recordtype>report</recordtype><sourceid>1RU</sourceid><recordid>eNrjZDD2qEwpyk-pzEvMzUxW8MvPLE5VSCvKz1Vwy0mtyEzKSVUIyi9Nz8hLLS5WcM1JzU3NKynmYWBNS8wpTuWF0twMMm6uIc4euiklmcnxxSWZeakl8Y4ujmZGRoYmlsYEpAFObSmp</recordid><startdate>20150629</startdate><enddate>20150629</enddate><creator>Jaworski, Justin W</creator><creator>Daly, Conor</creator><creator>Peake, Nigel</creator><scope>1RU</scope><scope>BHM</scope></search><sort><creationdate>20150629</creationdate><title>Hydrodynamic Noise from Flexible Roughness Elements</title><author>Jaworski, Justin W ; Daly, Conor ; Peake, Nigel</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-dtic_stinet_ADA6221493</frbrgroupid><rsrctype>reports</rsrctype><prefilter>reports</prefilter><language>eng</language><creationdate>2015</creationdate><topic>ACOUSTIC SIGNATURES</topic><topic>Acoustics</topic><topic>CONFORMAL MAPPING</topic><topic>FEATHERS</topic><topic>FLEXIBLE ROUGNNESS</topic><topic>HYDRODYNAMICS</topic><topic>KELVIN-HELMHOLTZ INSTABILITY</topic><topic>NOISE</topic><topic>POROUS CANOPY</topic><topic>SURFACE ROUGHNESS</topic><topic>VORTEX SOUND</topic><topic>WINGS</topic><toplevel>online_resources</toplevel><creatorcontrib>Jaworski, Justin W</creatorcontrib><creatorcontrib>Daly, Conor</creatorcontrib><creatorcontrib>Peake, Nigel</creatorcontrib><creatorcontrib>LEHIGH UNIV BETHLEHEM PA</creatorcontrib><collection>DTIC Technical Reports</collection><collection>DTIC STINET</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Jaworski, Justin W</au><au>Daly, Conor</au><au>Peake, Nigel</au><aucorp>LEHIGH UNIV BETHLEHEM PA</aucorp><format>book</format><genre>unknown</genre><ristype>RPRT</ristype><btitle>Hydrodynamic Noise from Flexible Roughness Elements</btitle><date>2015-06-29</date><risdate>2015</risdate><abstract>The influence of a poroelastic surface structure composed of elastic fibers, as inspired by the wings of silent owl species, is investigated theoretically through the development of two mathematical models. First, in the spatial limit of a sparse distribution of fibers that are hydrodynamically uncoupled, the influences of fiber bending and a background flow on the far field sound are studied using conformal mapping. A second model reveals how the porous surface structure can suppress pressure fluctuations, which agrees well with companion experiments performed by Dr. William Devenport of Virginia Tech.
Work supported in collaboration with NICOP grant N62909-12-1-7116 awarded to the University of Cambridge</abstract><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext_linktorsrc |
| identifier | |
| ispartof | |
| issn | |
| language | eng |
| recordid | cdi_dtic_stinet_ADA622149 |
| source | DTIC Technical Reports |
| subjects | ACOUSTIC SIGNATURES Acoustics CONFORMAL MAPPING FEATHERS FLEXIBLE ROUGNNESS HYDRODYNAMICS KELVIN-HELMHOLTZ INSTABILITY NOISE POROUS CANOPY SURFACE ROUGHNESS VORTEX SOUND WINGS |
| title | Hydrodynamic Noise from Flexible Roughness Elements |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-29T00%3A19%3A01IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-dtic_1RU&rft_val_fmt=info:ofi/fmt:kev:mtx:book&rft.genre=unknown&rft.btitle=Hydrodynamic%20Noise%20from%20Flexible%20Roughness%20Elements&rft.au=Jaworski,%20Justin%20W&rft.aucorp=LEHIGH%20UNIV%20BETHLEHEM%20PA&rft.date=2015-06-29&rft_id=info:doi/&rft_dat=%3Cdtic_1RU%3EADA622149%3C/dtic_1RU%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_id=info:pmid/&rfr_iscdi=true |