{"?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-FH9PNCMY/9250a773-c013-4294-9119-5a3f01813a2a/PDF","dcterms:extent":"771 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-FH9PNCMY/84495f15-40c2-4014-8483-02819ddc426e/TEXT","dcterms:extent":"31 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-FH9PNCMY","edm:isNextInSequence":{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:doc-X841TLEE"},"dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:spr-6QOUKQ9A"},{"@xml:lang":"sl","#text":"Strojniški vestnik"}],"dcterms:issued":"2015","dc:creator":["Čudina, Mirko","Lipar, Primož","Prezelj, Jurij","Šteblaj, Peter"],"dc:format":[{"@xml:lang":"sl","#text":"letnik:61"},{"@xml:lang":"sl","#text":"številka:nr. 10"},{"@xml:lang":"sl","#text":"str. 553-560, SI 103"}],"dc:identifier":["ISSN:0039-2480","COBISSID:14180635","URN:URN:NBN:SI:doc-FH9PNCMY"],"dc:language":"en","dc:publisher":{"@xml:lang":"sl","#text":"Zveza strojnih inženirjev in tehnikov Slovenije et al."},"dc:subject":[{"@xml:lang":"sl","#text":"adaptivni glušniki"},{"@xml:lang":"sl","#text":"izpušni sistemi"},{"@xml:lang":"sl","#text":"reaktivni glušniki"},{"@xml:lang":"sl","#text":"zmanjševanje hrupa"}],"dcterms:temporal":{"@rdf:resource":"1999-2025"},"dc:title":{"@xml:lang":"sl","#text":"A muffler with adaptive acoustic properties|"},"dc:description":[{"@xml:lang":"sl","#text":"Adaptive muffler upgrades the conventional muffler with a variable geometry to extend its working range. Adaptive muffler systems, described in the available literature, operate on the principle of controlling only single property of th e muffler to tune its working range. During the adaptation process of these systems the basic principle of operation is not changed. Based on the literature review, the question arises whether it would be possible to control the principle of operation. At one instant it would work as a Helmholtz resonator, in the other as an expansion chamber or side branch resonator. Analytical calculations provided a positive answer and a muffler with four active valves was designed and constructed to confirm the theoreti cal expectations. Properties of proposed muffler were simulated with Finite Element Method. Results of simulations were validated with measurements. Finally, simulations of proposed muffler, working at different operating conditions , were performed. Simula tio ns have shown that the proposed system allows tuning of the muffler to a wide working frequency range. Such approach to muffler design eliminates the need for additional mufflers used in IC exhaust systems. Therefore a smaller volume of the proposed muffler enables the same effect as multiple non-adaptive conventional mufflers"},{"@xml:lang":"sl","#text":"V članku so predstavljani rezultati raziskav, ki se nanašajo na zmanjševanje hrupa izpušnih sistemov motorjev z notranjim zgorevanjem in prezračevalnih sistemov. Raziskave so rezultat reševanja realnega problema pojava akustičnih resonanc v izpušnih sistemih. Akustične resonance se najpogosteje duši z vgradnjo konvencionalnih reaktivnih glušnikov, ki delujejo dobro pri danih obratovalnih razmerah in pri izbrani resonančni frekvenci, vendar ko se obratovalni pogoji spremenijo se spremeni tud resonančna frekvenca in delovanje reaktivnega glušnika ni več učinkovito. Praksa uglaševanja konvencionalnih reaktivnih glušnikov na resonančno frekvenco se je doslej izvajala s krmiljenjem posameznega parametra glušnika, npr. volumna, dolžine ali togosti aktivnega elementa. Vse dosedanje rešitve adaptivnih reaktivnih glušnikov so prostorsko potratne, elektromehansko zahtevne in so povezane s povečanjem mase glušnika"}],"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-FH9PNCMY","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:doc-FH9PNCMY"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:doc-FH9PNCMY/9250a773-c013-4294-9119-5a3f01813a2a/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-FH9PNCMY/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:doc-FH9PNCMY"}}}}