1756 KB40 KB199920252016Jazayeri, Seyed AliKagawa, ToshiharuKamali, MohammadrezaKawashima, KenjiNajafi, Faridletnik:62številka:nr. 5str. 318-328ISSN:0039-2480COBISSID_HOST:14646043URN:URN:NBN:SI:doc-MZ3CIH6VenZveza strojnih inženirjev in tehnikov Slovenije etc.Strojniški vestnikdrseči pristopgeneratorji pretokaizotermne komorepiezoelektrični aktuatorjiventili s šobo in odbojno ploščicoventili za regulacijo tlakaStudy on the performance and control of a piezo-actuated nozzle-flapper valve with an isothermal chamber|A new integrated nozzle-flapper valve equipped with a piezoelectric actuator and an isothermal chamber has been developed and studied in detail. The designed single stage valve controls the pressure and flow rate simply, effectively, and separately. This idea can easily be used in the pilot stage of a two-stage valve as well. Application of isothermal condition in the valve load chamber eliminates the dynamic malfunction that may persist from temperature variation within the valve load chamber; consequently, the governing equations for the prediction of pressure dynamics in the chamber are much more accurate and simpler. The valve has been equipped with a stacked type piezoelectric actuator which has a unique behaviour. Furthermore, stiffness, in the selected actuator, is enhanced against the thrust of the discharging flow from the nozzle, thus decreasing the complexity of dynamic equations of the valve. A detail mathematical model and simulation was developed to study the dynamic performance analysis of the proposed valve. An experimental test rig was built to validate the results of simulations. The unique features and performance of the proposed valve were studied thoroughly. The valve's governing equations are nonlinear in nature, and some variables of the equations are a source of some uncertainties; sliding mode approach was used to control the steady and unsteady pressure and output flow rate of the valveNamen predstavljene raziskave je uvedba novega ventila s šobo in odbojno ploščico (NF), za katerega so značilni spremenjen razpored delovnih elementov za izboljšanje dinamike, poenostavitev enačb ter odprava nekaterih omejitev tradicionalnih NF-ventilov. Za izpolnitev teh ciljev je bil novi ventil s šobo in odbojno ploščico zasnovan in opremljen s piezoelektričnim aktuatorjem in izotermno polnilno komoro. Dinamika polnilne komore, ki je glavni podsestav ventila, ima v celotni dinamiki ventila pomembno vlogo. Neobstoj točnega modela za spreminjanje stanja zraka v komori otežuje krmiljenje ventila. Zagotovitev izotermnih pogojev v komori ventila odpravlja dinamične napake zaradi temperaturnih sprememb v komori, vodilne enačbe za napovedovanje tlaka v komori pa so zato veliko točnejše in preprostejše. Izotermno stanje v komori ventila torej poenostavi njegovo krmiljenje, saj je le z enim samim tlačnim tipalom v komori ventila mogoče krmiliti tlak in pretokTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo