2946 KB40 KB199920252017Hu, QuanyiQin, XuxinTian, ShujunZhang, Hongštevilka:1letnik:63str. 65-77ISSN:0039-2480COBISSID_HOST:15213339URN:URN:NBN:SI:doc-M62RGNZNenZveza strojnih inženirjev in tehnikov Slovenije etc.Strojniški vestnikgrafi povezavindeks aktivnostimodeliranjeredukcija modelazaznavanje obremenitveModel reduction of a load-sensing hydraulic system via activity index analysis|A load-sensing hydraulic system is an energy-saving fluid power transmission that supplies "on-demand" flow at a prescribed pressure margin greater than load pressure. In the paper, based on bond graph methodology, a complex and non-linear load-lensing (LS) hydraulic system model is constructed, in which the dynamic behaviours of an LS valve are taken into account. Moreover, a series of experiments are performed to validate the model. Two reduced models based on activity index analysis are obtained to achieve a balance between accuracy and complexity. The results indicate that the system order and computation time can be reduced. By quantifying the relative importance of the elements based on activity index analysis, it shows that the inner leakage of the pump plays a major role in system dynamics due to its correlation to the damping coefficient. Furthermore, the results prove the rationality of representing LS pump dynamics with a fourth-order differential equation and the fact that the dynamics of LS valves have not been well-covered in the literatureHidravlični sistemi z zaznavanjem obremenitve (sistemi LS) so energijsko varčni prenosniki z delovnim fluidom, ki zagotavljajo pretok na zahtevo s specificiranim dodatkom nad tlakom obremenitve. Sistemi LS so nagnjeni k oscilacijam in lahko včasih postanejo nestabilni zaradi povratne zanke mehanizma za zaznavanje obremenitve. Tudi zagotavljanje celotne zmogljivosti ni preprosto zaradi nasprotujočih si zahtev po energijski učinkovitosti in hitrem dinamičnem odzivu, še posebej v širokem razponu obratovalnih pogojev. Snovanje sistemov LS je zato običajno bistveno zahtevnejše kot snovanje konvencionalnih hidravličnih sistemovTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo