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

4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-2 Outline –Reference List –To Explore Further –Major Applications –Basic Working Principle(s) –Benefits –Application Examples –Major specifications

4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-3 Reference list Wikipedia – Stephan Frischemeier, “Electrohydrostatic Actuators for Aircraft Primary Flight Control” Young & Franklin, Inc. – Parker – Moog –

4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-4 To Explore Further F-18 EHA Testing Results A380 Testing Results

4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-5 Major Applications Civil Aircraft Business Aircraft Military Aircraft Guide Vane Actuation Bleed Heat Valve Control Remote Subsea Actuation Electronically Controlled Thrusters Windmill Brakes

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 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-6

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 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-7

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 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-8

Basic Working Principle(s) 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-9 EHA Schematic; Source: Young and Franklin

Basic Working Principle(s) EHA Diagram; Source: Parker 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-10

Basic Working Principle(s) EHA Functional Diagram; Source: Moog 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-11

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 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-12

Basic Working Principle(s) EHA Hydraulic Circuit Schematic (Source: Stephan Frischemeier) 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-13

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 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-14

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 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-15

EHA Applications Boeing 787 EHA Utilization (Source: Moog) 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-16

EHA Applications EHA Implementation in the F-35; Source: Moog 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-17

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 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-18

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 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-19

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 4/30/2015 ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Slide-20