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Basic hydraulic systems

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Basic hydraulic systems

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Basic hydraulic systems

  1. 1. Aircraft Hydraulic Systems Abdalrahim AbuDayya
  2. 2. Basic Hydraulic System •A valve is opened, the hydraulic flows into the actuator and presses against the piston, causing it to move and in turn move the attached control surface
  3. 3. General Uses  Used for flight control, actuation of flaps, slats, weapons bays, landing gear, breaks  Provides the extra force required to move large control surfaces in heavy aerodynamic loads.
  4. 4. General Specifications  Several different Fluids  MIL-H-5606,  General   MIL-H-83282,   and MIL-H-81019 Temperature Ranges : -65°F to 295°F  Pressures:  Airbus A380 has 5000psi hydraulic system  Typical commercial airline pressure is 3000 psi
  5. 5. Problems with Hydraulics  Heavy  High maintenance   Adds cost and creates a logistics problem Requires space (pumps, hydraulic lines, etc.)
  6. 6. Possible Improvements  Electric Actuators  Consists of a small electric motor, pump and actuator ram requiring about 1 pint of hydraulic fluid  Flight tested by NASA’s Dryden Flight Research Center on a modified F-18.  Provides significant weight savings by eliminating pumps and hydraulic lines  Also could decrease required maintenance
  7. 7. Electro – Mechanical Actuator
  8. 8. Impact on Design  Need to allow sufficient space for required hydraulic systems  Weight of the system must be accounted for

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