ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Electrohydrostatic Actuator (

1. ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Topic: Electrohydrostatic Actuator (EHA) Prepared by: Brandon Chambers 3/7/2008

2. Outline • Reference List • To Explore Further • Major Applications • Basic Working Principle(s) • Benefits • Application Examples • Major specifications ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

3. Reference list • Wikipedia • http://en.wikipedia.org/wiki/Electro-hydrostatic_actuator • Stephan Frischemeier, “Electrohydrostatic Actuators for Aircraft Primary Flight Control” • Young & Franklin, Inc. • www.yf.com • Parker • www.parker.com • Moog • www.moog.com ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

4. To Explore Further • F-18 EHA Testing Results • A380 Testing Results ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

5. Major Applications • Civil Aircraft • Business Aircraft • Military Aircraft • Guide Vane Actuation • Bleed Heat Valve Control • Remote Subsea Actuation • Electronically Controlled Thrusters • Windmill Brakes ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

6. Basic Working Principle(s) • Electro-hydrostatic Actuators • “Power-by-Wire” • Meant to replace hydraulic systems • Self-contained actuator operated solely by electrical power using pulse code modulation signal • Removes the need for hydraulic lines and pumps • Replaces 3 separate actuating systems: • Actuator and values • Hydraulics • Control Network ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

7. Basic Working Principle(s) • Electro-hydrostatic Actuators (continued) • Electronic control of high force hydraulic application systems • Control and Energy signals sent by wires • Self-contained unit holding all electro-hydraulic components • Technologies utilized by EHA’s: • Accurate feedback controlled motors • High power stepper motors ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

8. Basic Working Principle(s) • EHA Components • Bi-directional hydraulic pump • Both pump ports connected to each side of linear or rotary actuator • Electric motor controls operation of the hydraulic pump • Electric servo controls operation of electric motor • Position sensor on actuator gives position feedback to servor • Pressurized reservoir provides hydraulic fluid ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

9. Basic Working Principle(s) • EHA Schematic; Source: Young and Franklin ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

10. Basic Working Principle(s) • EHA Diagram; Source: Parker ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

11. Basic Working Principle(s) • EHA Functional Diagram; Source: Moog ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

12. Basic Working Principle(s) • Two Main Types: • EHA-SM • EHA-SP • EHA-SM: “Has a constant displacment pump driven by a speed controlled, electronically commutated brushless DC motor” • EHA-SP: “Has an electronically controlled servopump driven by an uncontrolled AC induction motor” - Stephan Frischemeier ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

13. Basic Working Principle(s) • EHA Hydraulic Circuit Schematic (Source: Stephan Frischemeier) ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

14. Benefits • Benefits of an EHA over conventional hydraulics • Simpler system design • Reduced weight • Better streamlining/structural design • Draws power only when in motion • Hydraulic pressure maintained even when pump is not activated ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

15. Benefits • Benefits of an EHA over conventional hydraulics • Increase reliability for high force applications • Reduced pressure losses • Increase hydraulic efficiency; Fluid flow controlled on demand • Lower heat loss • Compact ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

16. EHA Applications • Boeing 787 EHA Utilization (Source: Moog) ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

17. EHA Applications • EHA Implementation in the F-35; Source: Moog ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

18. EHA Applications • Other specific aerospace projects using EHAs developed by Parker • Boeing 757: Developed and successfully demonstrated electrohydrostatic elevator actuator • Lockheed Martin HTTB: Demonstrated aileron EHA on C-130 test aircraft • Lockheed Martin J/IST: Replaced conventional F-16 flight controls with complete EHA system ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

19. Specifications • EHA specifications are highly dependent on the specific application • Specifications base on: • Required load profiles • Geometric arrangement of actuated surfaces • Stall loads • Required mechanical power at load/speed ranges • Maximum speed/load conditions ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

20. Specifications • Example specifications for the Young and Franklin 8631 Series EHA IGV • Force > 25,000 lbf • Hysteresis < 1% • 4-20 mA Input • 4-20 mA Output • 125 VDC • Backup Pump • Integrated Diagnostics Source: Young and Franklin ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators