Abstract
This paper presents a computer simulation of the non linear behavior of an electrohydraulic exciter. The experimental results and the simulated results are compared.
The model used takes into account the nonlinearities of the two-stage servovalve and the jack. Major nonlinearities included in the simulation are torque- motor hysteresis, flow forces acting on the servovalve spool, the pressure-flow relationships in the orifices (particularly near the null region), compressibility of the hydraulic fluid, clearance of the mechanical feedback link, fluid leakages, sticking forces, and variations of dead volumes.
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