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Aircraft Hydraulic Systems

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A valve is opened, the hydraulic flows into the actuator and presses ... Used for flight control, actuation of flaps, slats, weapons bays, landing gear, breaks ... – PowerPoint PPT presentation

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Title: Aircraft Hydraulic Systems


1
Aircraft Hydraulic Systems
AIAA Design Group II
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

Reference http//www.allstar.fiu.edu/AERO/Hydr02.
htm
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
General Specifications
  • Several different Fluids
  • MIL-H-5606,   MIL-H-83282,   and MIL-H-81019
  • General Temperature Ranges -65F to 295F
  • Pressures
  • Airbus A380 has 5000psi hydraulic system
  • Typical commercial airline pressure is 3000 psi
  • http//aerospace.eaton.com/news.asp?articledate06
    /01/03NewsCommandViewMonth
  • http//www.tpub.com/content/aviation/14018/css/140
    18_178.htm

5
Problems with Hydraulics
  • Heavy
  • High maintenance
  • Adds cost and creates a logistics problem
  • Requires space (pumps, hydraulic lines, etc.)

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 NASAs Dryden Flight Research
    Center on a modified F-18.
  • Provides significant weight savings by
    eliminating pumps and hydraulic lines
  • Also could decrease required maintenance

Reference NASA Dryden Flight Research Center.
News Release 98-84
7
Electro Mechanical Actuator
Reference Air Force Research Laboratory http//ww
w.afrlhorizons.com/Briefs/0006/VA9902.html
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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