{"?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-OANHXMOF/a4600908-3394-448f-b239-21499d566308/PDF","dcterms:extent":"1546 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-OANHXMOF/4d2aac5b-a0dd-4881-b083-d2b456649a17/TEXT","dcterms:extent":"32 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-OANHXMOF","edm:isNextInSequence":{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:doc-8EOKEB0C"},"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":["Sagiroglu, Selami","Uysal, Fatih"],"dc:format":[{"@xml:lang":"sl","#text":"številka:11"},{"@xml:lang":"sl","#text":"letnik:61"},{"@xml:lang":"sl","#text":"str. 632-640, SI 116"}],"dc:identifier":["ISSN:0039-2480","COBISSID:14317595","URN:URN:NBN:SI:doc-OANHXMOF"],"dc:language":"en","dc:publisher":{"@xml:lang":"sl","#text":"Zveza strojnih inženirjev in tehnikov Slovenije et al."},"dc:subject":[{"@xml:lang":"sl","#text":"elektropnevmatski mehanizem nihajnih vzvodov"},{"@xml:lang":"sl","#text":"Ottov motor"},{"@xml:lang":"sl","#text":"variabilno krmiljenje ventilov"},{"@xml:lang":"sl","#text":"vžigalna svečka"},{"@xml:lang":"sl","#text":"zmogljivost motorja"}],"dcterms:temporal":{"@rdf:resource":"1999-2025"},"dc:title":{"@xml:lang":"sl","#text":"The effects of a pneumatic-driven variable valve timing mechanism on the performance of an Otto engine|"},"dc:description":[{"@xml:lang":"sl","#text":"In this study, the classic cam mechanism of a single cylinder, four-stroke, 6 hp spark-ignited engine was replaced by an electro-pneumatic rocker mechanism, which is designed and manufactured to open the intake valve at low (3.7 mm), normal (5.7 mm) and high (7.7 mm) lifts between engine speeds of 1600 rpm to 2200 rpm. An air compressor was used to feed 6 bar air pressure in order to have the plungers drive the cams in an orderly manner. A control panel was used to control plungers in order to modulate the valve lifts gradually. The volumetric efficiency, torque, power and specific fuel consumption with this operation were measured at full load and compared to the values with a classic cam mechanism. The results of the study showed that decreasing the valve lift at low engine speeds and increasing the lift at high speeds improve the engine performance. Moreover, it was concluded that the idle speed can be lowered by decreasing the valve lift at low engine speeds"},{"@xml:lang":"sl","#text":"V predstavljeni študiji je bil klasični odmikalni mehanizem enovaljnega štiritaktnega motorja z vžigalno svečko in 6 konjskimi močmi zamenjan z elektropnevmatičnim mehanizmom nihajnih vzvodov, ki je bil zasnovan in izdelan za odpiranje sesalnega ventila z majhnim (3,7 mm), srednjim (5,7 mm) in velikim (7,7 mm) dvigom v območju vrtilnih hitrosti motorja od 1600 vrt./min do 2200 vrt./min. Zračni kompresor zagotavlja tlak 6 bar za bate, ki upravljajo z odmikali. Funkcije krmiljenja batov za postopno moduliranje dviga ventilov je opravljal krmilnik; volumetrični izkoristek, navor, moč in specifična poraba goriva med delovanjem pa so bili merjeni pri polni obremenitvi in primerjani z ustreznimi vrednostmi pri klasičnem odmikalnem mehanizmu. Rezultati študije so pokazali izboljšanje zmogljivosti motorja ob zmanjšanju dviga ventilov pri manjših vrtilnih hitrostih in ob povečanju dviga ventilov pri večjih hitrostih. Ugotovljeno je bilo tudi, da je mogoče vrtljaje prostega teka zmanjšati z zmanjšanjem dviga ventilov pri nižjih vrtljajih motorja"}],"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-OANHXMOF","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:doc-OANHXMOF"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:doc-OANHXMOF/a4600908-3394-448f-b239-21499d566308/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-OANHXMOF/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:doc-OANHXMOF"}}}}