2623 KB33 KB199920252014Chen, GuojinNi, JingXu, Mingletnik:60številka:9str. 581-591, SI 105ISSN:0039-2480COBISSID:13699611URN:URN:NBN:SI:doc-75XMJACAenZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikdinamikahidromotorjiodzivprihranek energijeservomotorjivariabilna hitrostvariabilna obremenitevDynamic simulation of variable-speed valve-controlled-motor drive system with a power-assisted device|The variable-speed electrohydraulic drive has been applied in hydraulic machines having power matching means. However, further development has been restricted by its slow response and poor low-speed behavior. Owing to these disadvantages, a novel drive principle comprising a variable-speed valve-controlled-motor drive with an accumulator-based power assisted unit (PAU) is proposed. The PAU is an energy assisting and recycling device, which can release or absorb hydraulic energy according to the system's requirements. With the aid of PAU, the proposed drive is expected to improve response and control precision compared with the variable-speed drive. The proposed drive principle system is a multi-input-multi-output (MIMO) complicated nonlinear system with time-varying, which increases the control difficulty. A mathematical model of the proposed drive was first derived then a hybrid control strategy was presented. The dynamic simulations of three traditional drives and the novel one were performed using AMESim-Simulink co-simulation models. The four drives have been tested using three common variable-load disturbances. Comparisons of simulation results show that the proposed drive principle system demonstrates a good dynamic performance, which can not only achieve the expected energy saving target, but also significantly improve the response and control precision over the existing variable-speed drive systemElektrohidravlični pogoni z variabilno hitrostjo (elektromotor s krmiljenjem hitrosti v kombinaciji s konstantno hidravlično črpalko) so obetavni, saj razen večje energijske učinkovitosti kot pogoni z elektromotorjem konstantne hitrosti v kombinaciji s hidravlično črpalko spremenljive delovne prostornine zagotavljajo tudi večjo zanesljivost sistema in širši razpon hitrosti. Pogoni z variabilno hitrostjo so s svojo močjo našli mesto v različnih hidravličnih strojih, njihov nadaljnji razvoj pa bi se lahko ustavil zaradi slabše odzivnosti in pomanjkljivih nizkohitrostnih lastnosti, ki so posledica vztrajnosti elektromotorja in hidravlične črpalke. Cilj raziskave je razvoj nove rešitve krmiljenja hitrosti elektrohidravličnega pogona, ki odpravlja pomanjkljivosti pogonov z variabilno hitrostjo in je primerna za praktično raboTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo