Electric servo systems have superior performance in comparison with hydraulic drives in the small and medium applications they are comparatively expensive and may be dissipation-sensitive. In contrast to the DC motor driven systems hydraulic differential cylinders are very intricate, non-linear, strongly coupled multivariable electromechanical engines of significant parameters, which are very difficult to control or even to measure. Traditional controllers require a relatively accurate information on these parameters. In this paper a novel adaptive control is presented which evades the problem of the incomplete and inaccurate information of these parameters as well as their time-dependence. The method is promising in other fields of application where the behavior of a complex system under unknown environmental interaction is to be predicted.
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