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1.
Design of Lyapunov based nonlinear velocity control of electrohydraulic velocity servo systems
Edvard Detiček, Nenad Gubeljak, Mitja Kastrevc, 2017, izvirni znanstveni članek

Opis: Development of a hydraulically driven process of steel centrifugal die casting industry requires accurate response of position in time. In the frame of preliminary investigations the analysis and control of electrohydraulic velocity servo system is considered in the presence of flow nonlinearities and internal friction. The nonlinear and uncertainty characteristics make the conventional controller not yield to the system high requirements. Two different nonlinear design procedures are employed: feedback linearization and backstepping. It is shown that both these techniques can be successfully used to stabilize any chosen operating point of the system. Additionally, invaluable new insights are gained about the dynamics of the system under consideration. This illustrates that the true potential of constructive nonlinear design lies far beyond the mere task of achieving a desired control objective. All derived results are validated by computer simulation of the nonlinear mathematical model of the system.
Ključne besede: computer simulation, electro-hydraulic velocity servo system, integrator backstepping, Lyapunov methods, velocity control
Objavljeno v DKUM: 11.07.2017; Ogledov: 1433; Prenosov: 381
.pdf Celotno besedilo (1,52 MB)
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2.
High bulk modulus of ionic liquid and effects on performance of hydraulic system
Milan Kambič, Roland Kalb, Tadej Tašner, Darko Lovrec, 2014, izvirni znanstveni članek

Opis: Over recent years ionic liquids have gained in importance, causing a growing number of scientists and engineers to investigate possible applications for these liquids because of their unique physical and chemical properties. Their outstanding advantages such as nonflammable liquid within a broad liquid range, high thermal, mechanical, and chemical stabilities, low solubility for gases, attractive tribological properties (lubrication), and very low compressibility, and so forth, make them more interesting for applications in mechanical engineering, offering great potential for new innovative processes, and also as a novel hydraulic fluid. This paper focuses on the outstanding compressibility properties of ionic liquid EMIM-EtSO4, a very important physical chemically property when IL is used as a hydraulic fluid. This very low compressibility (respectively, very high Bulk modulus), compared to the classical hydraulic mineral oils or the non-flammable HFDU type of hydraulic fluids, opens up new possibilities regarding its usage within hydraulic systems with increased dynamics, respectively, systemsʼ dynamic responses.
Ključne besede: ionic liquids, hydraulic system, high bulk modulus
Objavljeno v DKUM: 15.06.2017; Ogledov: 1397; Prenosov: 384
.pdf Celotno besedilo (1,91 MB)
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