New strategy of adaptive position control of electro-hydraulic linear drive
Detiček, Edvard ; Kiker, Edvard
High speed and high accuracy positioning is a key element in modern machines and mechanical systems. Besides the high speed operations, which yields increased productivity and high accuracy ...positioning, which ensures improved product quality the insensibility of positioning system to external disturbances and parameter uncertainties, provides reliability and flexibilityof these systems. Fluid power actutators are characterized by their high power density and excellent dynamic response. The hydraulic actuator in particular is capable of very high output power levels combined with very compact drive unit demensions. It is ideally suited to many high dynamic applications.However the disadvantages of hydraulic system such as non-linear dynamic behaviour due to friction, fluid compressibility , etc. need to be over come. This is successfully obtainable only by implementation of modern digital control system designed on basic of modern control theory. An adaptive digital control concepts for position control of electro-hydraulic linear drive is represented in this paper. It is developed on basis of conventional control theory and consists of forefilter, self tunning controller and switching integrator. In enables a perfect reference signal tracing and precise positioning, as well as agood adaption on external disturbances and parameter changes. The usefullnes of the digital control algorythm is experimentally tested to the level that it is completlly applicable in industrial practice.
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