{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-A67RAAQC/9a1e6b43-7391-4788-847e-02ab9a1f3c06/HTML","dcterms:extent":"51 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-A67RAAQC/9c8190f3-111f-48c9-be8b-e70a6699caa5/PDF","dcterms:extent":"1620 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-A67RAAQC/497fe6b6-8d87-47d4-a9cc-51949c9583f5/TEXT","dcterms:extent":"52 KB"}],"edm:TimeSpan":{"@rdf:about":"1999-2025","edm:begin":{"@xml:lang":"en","#text":"1999"},"edm:end":{"@xml:lang":"en","#text":"2025"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:doc-A67RAAQC","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:spr-6QOUKQ9A"},{"@xml:lang":"sl","#text":"Strojniški vestnik"}],"dcterms:issued":"2004","dc:creator":["Kopač, Janez","Šali, Samo","Žnidarič, Uroš"],"dc:format":[{"@xml:lang":"sl","#text":"številka:12"},{"@xml:lang":"sl","#text":"14 strani"},{"@xml:lang":"sl","#text":"letnik:50"},{"@xml:lang":"sl","#text":"str. 580-593"}],"dc:identifier":["ISSN:0039-2480","COBISSID:7894555","URN:URN:NBN:SI:doc-A67RAAQC"],"dc:language":["en","sl"],"dc:publisher":[{"@xml:lang":"sl","#text":"Association of Mechanical Engineers and Technicians of Slovenia et al."},{"@xml:lang":"sl","#text":"Zveza strojnih inženirjev in tehnikov Slovenije et al."}],"dc:subject":[{"@xml:lang":"sl","#text":"analize modalne"},{"@xml:lang":"sl","#text":"kompoziti"},{"@xml:lang":"sl","#text":"lastnosti akustične"},{"@xml:lang":"sl","#text":"materiali kompozitni"},{"@xml:lang":"sl","#text":"metode preskušanja"},{"@xml:lang":"sl","#text":"ohišja"},{"@xml:lang":"sl","#text":"zvočne lastnosti"}],"dcterms:temporal":{"@rdf:resource":"1999-2025"},"dc:title":{"@xml:lang":"sl","#text":"Analiza zvočnih lastnosti kompozitnih materialov| An analysis of the acoustic properties of composite materials|"},"dc:description":[{"@xml:lang":"sl","#text":"To help select the best material for loudspeaker boxes, we tested various types of polymer materials that are filled with fine, ground wood particles. In addition, we compared these materials with aluminium, MDF (medium-density fiberboard), polystyrene from another producer of loudspeaker boxes (JVC), andABS (acrylnitril - butadiene - styrene). All the specimens were in the shape of square plates with dimensions 150 150 mm and the thickness 2 mm. Because the analysis was focused on the acoustic properties of the materials, we measured their relative sound-wave resistance, the relative damping of the sound radiation and the viscous-damping factor. The first two parameters are derived from the density and the relative modulus of elasticity, which can be obtained from measurements of the frequency response for free-supported specimens. The results show that a careful selection of fine, ground wood particles and polymer can give a satisfactory approximation to MDF, which is known as one of the best choices for the production of loudspeaker boxes"},{"@xml:lang":"sl","#text":"Da bi izdelovalcu okrovov zvočnikov olajsali izbiro optimalnega materiala, smo testirali različne vrste plastičnih materialov, oplemenitenih z drobno mletimi lesnimi delci, ter jih primerjali z aluminijem, MDF (srednje gosti komopziti), polistirenom drugega izdelovalca zvočnikov (JVC) in ABS (akrilonitril - butadien - stiren). Vsi preizkusani materiali so bili v obliki plošč z izmerami 150*150 mm, njihova debelina pa je bila 2 mm. Ker so bile v ospredju testov zvočne lastnosti materialov, smo merili njihov relativni zvočni upor, relativno dusenje zvočne radiacije in faktor viskoznega dusenja. Prvi dve veličini sta izpeljani iz gostote in relativnega modula elastičnosti, ki ju lahko dobimo iz meritev frekvenčnega odziva prosto vpetih preizkusancev. Rezultati kazejo, da se s pravilno izbiro drobno mletih lesnih delcev in plastične osnove lahko priblizamo materialu MDF, ki velja za zelo dobro izbiro pri izdelavi okrova zvočnika"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:doc-A67RAAQC","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:doc-A67RAAQC"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:doc-A67RAAQC/9c8190f3-111f-48c9-be8b-e70a6699caa5/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Univerza v Ljubljani, Fakulteta za strojništvo"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:doc-A67RAAQC/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:doc-A67RAAQC"}}}}