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Because there is flexible load in electro-hydraulic force servo control system, and there is second-order differential section whose oscillation frequency is low in the numerator of the transfer function, the frequency range of the electro-hydraulic force servo control system is influenced badly and the system may oscillate easily even is instability. Aiming at this characteristic of electro-hydraulic...
The superfluous force seriously affects the dynamic load precision of the electro-hydraulic load simulator. Aiming at this question, the work principle of the electro-hydraulic load simulator was analyzed, and the bond graph models of the flow servo valve, hydraulic cylinder and load were established. These models sufficiently contain the higher-order nonlinear dynamic character of the electro-hydraulic...
This paper presents sliding mode control with integral compensation and fuzzy tuning for hydraulic flight motion simulator servo system, which is highly nonlinear in nature with large parameter variations and severe load coupling among channels. The proposed control consists of an equivalent control for assigning desired sliding eigenvalues of the nominal closed-loop system, a switching control for...
This paper presents a novel robust sliding mode controller with fuzzy tuning for Stewart platform servo system, which suffers from high nonlinear dynamics and serious load coupling among channels. The controller consists of an equivalent control to assign desired dynamics to the closed-loop system, a switching control to guarantee a sliding mode, and a fuzzy control to enhance fast tracking and attenuate...
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