2195 KB29 KB199920252015Nagode, MarkoOkorn, Ivanštevilka:1letnik:61str. 53-62, SI 9ISSN:0039-2480COBISSID:13857051URN:URN:NBN:SI:doc-7JM8Y9QFenZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikenergijska učinkovitosthistereza vzmetipreizkuševališčatorne izgubevztrajnikizračne vzmetiAnalysis of energy efficiency of a test rig for air springs|During dynamic testing of vehicle air springs, work is required for loading the springs. This work is partially returned by the spring to the driving system during the release phase. Testing is energy-efficient when at least a portion of the returned work can be utilised. This was taken into account in the design of the new inovative test rig for the simultaneous testing of four air springs. There is a phase shift between the phases of loading individual air springs; thus, the work returned to the drive system by a spring during its release is also used for loading another spring. The test rig was constructed and operates in the laboratory of an air spring manufacturer. We developed a computer program to analyse the energy situation in the test rig. The program calculates the work required for loading the springs, power and friction for different sizes of springs and test conditions. In this paper, computational algorithms are deduced and the results of the calculation for the treated spring are presented. The energy situation in the test rig during start-up and operation is discussed, taking into account the energy loss due to the hysteresis of springs and friction losses. The friction losses are evaluated for different implementations of critical elements. The influence of a flywheel on conditions during the start-up and operation of the test rig is analysedNamen raziskave je bil analizirati energijsko učinkovitost novega preizkuševališča za zračne vzmeti in jo primerjati z energijsko učinkovitostjo obstoječih preizkuševališč. Za dinamično preizkuševanje se uporabljajo namenska preizkuševališča, ki omogočajo spreminjanje geometrije vpetja vzmeti, ki odraža realno vpetje vzmeti na vozilu. Za obremenjevanje vzmeti je potrebno delo, ki ga vzmet v fazi razbremenjevanja delno vrne v pogonski sistem. Količina vrnjenega dela je odvisna od histereze vzmeti in izgub zaradi trenja med pogonom in vzmetjo. Preizkušanje je energijsko učinkovito, če se vsaj del vrnjenega dela koristno izrabi. To dejstvo je bilo upoštevano pri zasnovi novega preizkuševališča. Preizkuševališče je bilo izdelano in obratuje v laboratoriju proizvajalca zračnih vzmeti. Uporablja se za homologacijske preizkuse in za raziskovalno deloTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo