Modeling of EHA Module Equipped with Fixed-Displacement Vane Pump
Résumé
The combination of electrics and hydraulics technology is addressed for aerospace actuators. Once compared the inherent advantages and drawbacks of each technology, the evolution of signalling and powering is presented. At the signal level, fly-by-wire, fly-by-light and fly-wireless are rapidly reviewed. At the power level, after presenting the recent designs well established for already flying aircrafts (local hydraulic power generations, direct drive valves, electro-hydrostatic actuators, electro-backup-hydrostatic actuators, electro-backup-hydro-mechanical actuators), jam tolerant actuation is discussed in detail considering a passive hydraulic backup electromechanical actuator that is presently investigated for landing gear extension and retraction. A simplified analytical model is proposed for assessing rapidly the influence of the passive hydraulic power path on the actuator design and performance.