Abstract
The effect of varying load conditions on dynamic and static properties of a flexible electrohydraulic position control servo system is investigated theoretically and experimentally in this paper. Three different control methods were used. P control was taken into the research as a reference. P + PID/x; was used because it is a good method of damping the oscillations of flexible servos. Model reference control (MRC) was included as a new possible method of getting good dynamic results. In the mathematic analysis the aim was to develop system models that are not too complicated but still describe well this kind of heavily loaded flexible servo system. The non-linearities included were the dead band and saturation of the valve and the non-linearity of the load flow.
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