Rodyti trumpą aprašą

dc.contributor.authorŠaliūnas, Darius
dc.contributor.authorVolkovas, Vitalijus
dc.contributor.authorJanuševičius, Tomas
dc.date.accessioned2023-09-18T16:34:23Z
dc.date.available2023-09-18T16:34:23Z
dc.date.issued2016
dc.identifier.issn1392-8716
dc.identifier.other(BIS)KTU02-000057286
dc.identifier.urihttps://etalpykla.vilniustech.lt/handle/123456789/115093
dc.description.abstractThe paper presents an investigation simulating transformations of an acoustic field at low frequencies indoors, when the sound source is outdoors. The investigation was performed using a simplified and 5-times-smaller physical model. The paper presents measured spatial sound pressure level (SPL) distribution at 1/3 octave bands as well as at discrete frequencies (at various room modes). Measurements inside the physical model (at a total of 2,565 points) confirm that when exposed to outdoor broadband noise, low-frequency sound pressure levels at 1/3 octave bands inside the room can differ by more than 30 dB, while at discrete frequencies measured SPL can vary by 50 dB or more. Below the calculated lowest room mode, due to resonant vibrations of physical model walls, large differences in sound pressure levels inside the model (up to 20.7 dB at 100 Hz 1/3 octave band and up to 32.4 dB at discrete Hz frequencies) were found. The investigation also includes analysis of levels in the corners of physical models compared to average sound pressure levels in the whole model space or some cross-sections, which shows that sound pressure levels in corners can be up to 10 dB lower. Calculation of the indoor average sound pressure level at low frequencies according to empirical formulas specified in standard ISO 12354‑3 showed conformity between measurement and calculation results only in a part of the investigated range of frequency bands. Calculations using FEM at discrete frequencies gave more adequate results of sound pressure levels and their spatial distribution. FEM calculations proved that calculation of the average sound pressure level from measurements at points every 25 cm (every 5 cm in the physical model) can produce results close to the average of the sound pressure level of the room if it were measured at every possible position.eng
dc.formatPDF
dc.format.extentp. 2693-2713
dc.format.mediumtekstas / txt
dc.language.isoeng
dc.relation.isreferencedbyScience Citation Index Expanded (Web of Science)
dc.relation.isreferencedbyCurrent Abstracts
dc.relation.isreferencedbyComputers & Applied Sciences Complete
dc.relation.isreferencedbyINSPEC
dc.relation.isreferencedbyTOC Premier
dc.relation.isreferencedbyAcademic Search Complete
dc.source.urihttp://www.jvejournals.com/Vibro/article/JVE-17248.html
dc.subjectAE01 - Aplinkos sistemos ir aplinkos apsaugos technologijos / Environmental systems and environment protection technologies
dc.titleStudy of measured indoor low-frequency noise levels resulting from outdoor noise sources, using a simplified physical model as well as empirical and FEM calculations
dc.typeStraipsnis Web of Science DB / Article in Web of Science DB
dcterms.references16
dc.type.pubtypeS1 - Straipsnis Web of Science DB / Web of Science DB article
dc.contributor.institutionKauno technologijos universitetas
dc.contributor.institutionVilniaus Gedimino technikos universitetas
dc.contributor.facultyCivilinės inžinerijos mokslo centras / Civil Engineering Research Centre
dc.subject.researchfieldT 004 - Aplinkos inžinerija / Environmental engineering
dc.subject.researchfieldT 009 - Mechanikos inžinerija / Mechanical enginering
dc.subject.ltspecializationsL102 - Energetika ir tvari aplinka / Energy and a sustainable environment
dc.subject.ltspecializationsC101 - Civilinės inžinerijos mokslo centras /
dc.subject.enlow frequency noise
dc.subject.enspatial distribution (variation) of sound pressure levels
dc.subject.enroom modes
dcterms.sourcetitleJournal of vibroengineering
dc.description.issueiss. 4
dc.description.volumevol. 18
dc.publisher.nameJVE International
dc.publisher.cityKaunas
dc.identifier.doi10.21595/jve.2016.17248
dc.identifier.elaba16968349


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