Improvement of the statical behaviour of pressure controlled axial piston pumpsDarko Lovrec
, Edvard Detiček
, 2009, izvirni znanstveni članek
Opis: The control of pressure by means of variable displacement pumps is one of the most important tasks in the field of pump control, which is influenced by the properties of the pumps. Looking for a suitable control concept with good static behaviour, a method is tested which tunes the parameters of a controller. Instancing a variable displacement axial piston pump controlled bya 3/2 proportional valve the improvement will be achieved by fuzzy logic on the one hand and a non-linear approach - adaptation of gain of the classical controller - on the other.
Ključne besede: servo hydraulic, variable displacement pump, pressure control, conventional control structures, fuzzy control structures, nonlinear control structures
Objavljeno: 31.05.2012; Ogledov: 859; Prenosov: 26
Povezava na celotno besedilo
Design of Lyapunov based nonlinear velocity control of electrohydraulic velocity servo systemsEdvard 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: 11.07.2017; Ogledov: 288; Prenosov: 147
Celotno besedilo (1,52 MB)
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