skip to content
Measured and calculated transmission losses of sound waves through a helium layer Preview this item
ClosePreview this item
Checking...

Measured and calculated transmission losses of sound waves through a helium layer

Author: Thomas D Norum; Langley Research Center.; United States. National Aeronautics and Space Administration.
Publisher: Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va.] : [For sale by the National Technical Information Service], 1973.
Series: NASA technical note, D-7230.
Edition/Format:   eBook : Document : National government publication : EnglishView all editions and formats
Summary:
An experiment was performed to measure the transmission losses of sound waves traversing an impedance layer. The sound emanated from a point source and the impedance layer was created by a low-speed helium jet. The transmission losses measured were of the order of 12 db for frequencies of the source between 4 and 12 kHz. These losses are greater than those predicted from analysis when the observer angle is less than  Read more...
Rating:

(not yet rated) 0 with reviews - Be the first.

Subjects
More like this

Find a copy online

Find a copy in the library

&AllPage.SpinnerRetrieving; Finding libraries that hold this item...

Details

Additional Physical Format: Online version:
Norum, Thomas D.
Measured and calculated transmission losses of sound waves through a helium layer.
Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973
(OCoLC)761390732
Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Thomas D Norum; Langley Research Center.; United States. National Aeronautics and Space Administration.
OCLC Number: 24267142
Notes: Cover title.
Prepared at Langley Research Center.
Description: 1 online resource (23 pages) : illustrations.
Series Title: NASA technical note, D-7230.
Responsibility: by Thomas D. Norum.

Abstract:

An experiment was performed to measure the transmission losses of sound waves traversing an impedance layer. The sound emanated from a point source and the impedance layer was created by a low-speed helium jet. The transmission losses measured were of the order of 12 db for frequencies of the source between 4 and 12 kHz. These losses are greater than those predicted from analysis when the observer angle is less than about 35 deg, but less than those predicted for larger observer angles. The experimental results indicate that appreciable noise reductions can be realized for an observer shielded by an impedance layer, irrespective of his position relative to the source of sound.

Reviews

User-contributed reviews
Retrieving GoodReads reviews...
Retrieving DOGObooks reviews...

Tags

Be the first.
Confirm this request

You may have already requested this item. Please select Ok if you would like to proceed with this request anyway.

Linked Data


Primary Entity

<http://www.worldcat.org/oclc/24267142> # Measured and calculated transmission losses of sound waves through a helium layer
    a schema:CreativeWork, schema:Book, schema:MediaObject ;
    library:oclcnum "24267142" ;
    library:placeOfPublication <http://id.loc.gov/vocabulary/countries/dcu> ;
    library:placeOfPublication <http://experiment.worldcat.org/entity/work/data/26320979#Place/washington_d_c> ; # Washington, D.C.
    library:placeOfPublication <http://experiment.worldcat.org/entity/work/data/26320979#Place/springfield_va> ; # Springfield, Va.
    schema:about <http://experiment.worldcat.org/entity/work/data/26320979#Topic/helium> ; # Helium
    schema:about <http://id.worldcat.org/fast/982418> ; # Jet nozzles--Noise
    schema:about <http://id.worldcat.org/fast/1127077> ; # Sound-waves
    schema:about <http://id.worldcat.org/fast/954719> ; # Helium
    schema:about <http://experiment.worldcat.org/entity/work/data/26320979#Topic/sound_waves> ; # Sound-waves
    schema:about <http://experiment.worldcat.org/entity/work/data/26320979#Topic/jet_nozzles_noise> ; # Jet nozzles--Noise
    schema:about <http://experiment.worldcat.org/entity/work/data/26320979#Topic/acoustic_impedance_materials_testing> ; # Acoustic impedance--Materials--Testing
    schema:bookFormat schema:EBook ;
    schema:contributor <http://viaf.org/viaf/127305149> ; # Langley Research Center.
    schema:contributor <http://viaf.org/viaf/146202023> ; # United States. National Aeronautics and Space Administration.
    schema:creator <http://viaf.org/viaf/77588792> ; # Thomas D. Norum
    schema:datePublished "1973" ;
    schema:description "An experiment was performed to measure the transmission losses of sound waves traversing an impedance layer. The sound emanated from a point source and the impedance layer was created by a low-speed helium jet. The transmission losses measured were of the order of 12 db for frequencies of the source between 4 and 12 kHz. These losses are greater than those predicted from analysis when the observer angle is less than about 35 deg, but less than those predicted for larger observer angles. The experimental results indicate that appreciable noise reductions can be realized for an observer shielded by an impedance layer, irrespective of his position relative to the source of sound."@en ;
    schema:exampleOfWork <http://worldcat.org/entity/work/id/26320979> ;
    schema:genre "Government publication"@en ;
    schema:genre "National government publication"@en ;
    schema:inLanguage "en" ;
    schema:isPartOf <http://experiment.worldcat.org/entity/work/data/26320979#Series/nasa_technical_note> ; # NASA technical note ;
    schema:isSimilarTo <http://www.worldcat.org/oclc/761390732> ;
    schema:name "Measured and calculated transmission losses of sound waves through a helium layer"@en ;
    schema:productID "24267142" ;
    schema:publication <http://www.worldcat.org/title/-/oclc/24267142#PublicationEvent/washington_d_c_national_aeronautics_and_space_administration_springfield_va_for_sale_by_the_national_technical_information_service_1973> ;
    schema:publisher <http://experiment.worldcat.org/entity/work/data/26320979#Agent/national_aeronautics_and_space_administration> ; # National Aeronautics and Space Administration
    schema:publisher <http://experiment.worldcat.org/entity/work/data/26320979#Agent/for_sale_by_the_national_technical_information_service> ; # [For sale by the National Technical Information Service]
    schema:url <http://books.google.com/books?id=12Uw8mmxu0QC> ;
    schema:url <http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19730015008_1973015008.pdf> ;
    schema:url <http://catalog.hathitrust.org/api/volumes/oclc/24267142.html> ;
    wdrs:describedby <http://www.worldcat.org/title/-/oclc/24267142> ;
    .


Related Entities

<http://experiment.worldcat.org/entity/work/data/26320979#Agent/for_sale_by_the_national_technical_information_service> # [For sale by the National Technical Information Service]
    a bgn:Agent ;
    schema:name "[For sale by the National Technical Information Service]" ;
    .

<http://experiment.worldcat.org/entity/work/data/26320979#Agent/national_aeronautics_and_space_administration> # National Aeronautics and Space Administration
    a bgn:Agent ;
    schema:name "National Aeronautics and Space Administration" ;
    .

<http://experiment.worldcat.org/entity/work/data/26320979#Place/springfield_va> # Springfield, Va.
    a schema:Place ;
    schema:name "Springfield, Va." ;
    .

<http://experiment.worldcat.org/entity/work/data/26320979#Place/washington_d_c> # Washington, D.C.
    a schema:Place ;
    schema:name "Washington, D.C." ;
    .

<http://experiment.worldcat.org/entity/work/data/26320979#Series/nasa_technical_note> # NASA technical note ;
    a bgn:PublicationSeries ;
    schema:hasPart <http://www.worldcat.org/oclc/24267142> ; # Measured and calculated transmission losses of sound waves through a helium layer
    schema:name "NASA technical note ;" ;
    .

<http://experiment.worldcat.org/entity/work/data/26320979#Topic/acoustic_impedance_materials_testing> # Acoustic impedance--Materials--Testing
    a schema:Intangible ;
    schema:hasPart <http://id.loc.gov/authorities/subjects/sh85000579> ;
    schema:name "Acoustic impedance--Materials--Testing"@en ;
    .

<http://id.worldcat.org/fast/1127077> # Sound-waves
    a schema:Intangible ;
    schema:name "Sound-waves"@en ;
    .

<http://id.worldcat.org/fast/954719> # Helium
    a schema:Intangible ;
    schema:name "Helium"@en ;
    .

<http://id.worldcat.org/fast/982418> # Jet nozzles--Noise
    a schema:Intangible ;
    schema:name "Jet nozzles--Noise"@en ;
    .

<http://viaf.org/viaf/127305149> # Langley Research Center.
    a schema:Organization ;
    schema:name "Langley Research Center." ;
    .

<http://viaf.org/viaf/146202023> # United States. National Aeronautics and Space Administration.
    a schema:Organization ;
    schema:name "United States. National Aeronautics and Space Administration." ;
    .

<http://viaf.org/viaf/77588792> # Thomas D. Norum
    a schema:Person ;
    schema:familyName "Norum" ;
    schema:givenName "Thomas D." ;
    schema:name "Thomas D. Norum" ;
    .

<http://www.worldcat.org/oclc/761390732>
    a schema:CreativeWork ;
    rdfs:label "Measured and calculated transmission losses of sound waves through a helium layer." ;
    schema:description "Online version:" ;
    schema:isSimilarTo <http://www.worldcat.org/oclc/24267142> ; # Measured and calculated transmission losses of sound waves through a helium layer
    .

<http://www.worldcat.org/title/-/oclc/24267142>
    a genont:InformationResource, genont:ContentTypeGenericResource ;
    schema:about <http://www.worldcat.org/oclc/24267142> ; # Measured and calculated transmission losses of sound waves through a helium layer
    schema:dateModified "2018-03-29" ;
    void:inDataset <http://purl.oclc.org/dataset/WorldCat> ;
    .

<http://www.worldcat.org/title/-/oclc/24267142#PublicationEvent/washington_d_c_national_aeronautics_and_space_administration_springfield_va_for_sale_by_the_national_technical_information_service_1973>
    a schema:PublicationEvent ;
    schema:location <http://experiment.worldcat.org/entity/work/data/26320979#Place/springfield_va> ; # Springfield, Va.
    schema:location <http://experiment.worldcat.org/entity/work/data/26320979#Place/washington_d_c> ; # Washington, D.C.
    schema:organizer <http://experiment.worldcat.org/entity/work/data/26320979#Agent/for_sale_by_the_national_technical_information_service> ; # [For sale by the National Technical Information Service]
    schema:organizer <http://experiment.worldcat.org/entity/work/data/26320979#Agent/national_aeronautics_and_space_administration> ; # National Aeronautics and Space Administration
    schema:startDate "1973" ;
    .


Content-negotiable representations

Close Window

Please sign in to WorldCat 

Don't have an account? You can easily create a free account.