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Hydraulic and Electrical Power Design Decision

Hydraulic and Electrical Power Design Decision. Cynthia Perreira IMDL and SRL Dr. Book and Dr. Paredis February 21, 2003. Introduction. Two major power sources for mechanical devices Electrical Hydraulic Decision not always made in best, most informed manner

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Hydraulic and Electrical Power Design Decision

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  1. Hydraulic and Electrical Power Design Decision Cynthia Perreira IMDL and SRL Dr. Book and Dr. Paredis February 21, 2003

  2. Introduction • Two major power sources for mechanical devices • Electrical • Hydraulic • Decision not always made in best, most informed manner • Decision is often made too early in the design process • Develop method of dealing with this type of decision

  3. Introduction • Research into Electrical, Hydraulic power as separate power sources • Little specifically comparing their advantages/disadvantages • Doesn’t appear to be any formalized method for making the choice between them

  4. Approach • Develop a method for choosing between two families • Multiple Levels of choices/modeling • Performance Measurements • Develop systematic method • Examine an example and apply the method • Understand current technology choices • Add to proposed method • Apply proposed method • Examine results

  5. OR OR AND AND OR OR Composition Selection Power Tree • Inside each family of power there are many difference options Drive System Electric Hydraulic Pneumatic Actuator Valves Pump Rotational Rotational Translational Translational AND cylinder linkage

  6. Multiple Levels of Modeling Hydraulic • Selection between two families of solutions • Best family = family containing the best instance • Requires design knowledge • Models at different levels of abstraction Electrical H Performance E

  7. Levels of Modeling • Simple models • F=ma • P=Tv • Rules of thumb • Known values for groups of components • Simulation • Matlab • Modelica

  8. Performance Measurements • Power output • Velocity, Torque • Geometry, space required • Weight • Efficiency • Cost • Noise • Other application specific factors

  9. Applications of Fluid Power • Automotive • Drive • Brakes • Power Steering • Manufacturing machinery • Construction equipment • Loaders • Cranes • Bulldozers • Robots • Elevators

  10. Power Steering Example • Technology that lends itself well to the use of either hydraulic or electrical power • Currently dominated by hydraulics • Electro-hydraulic systems • Electrical recently implemented in some new small cars ***Contacts with NSK, Ford, Siemens

  11. Hydraulic Power Steering

  12. Electro-hydraulic Systems • Electric motor to power steering pump • Speed of motor can be varied or turned off • Can be used for large and small vehicles • Advantages • Better fuel efficiency • Motor can turn off when not in use • Less energy consumption

  13. Electrical Power Steering

  14. Electrical Power Steering • Advantages • Environment • Off when not turning • Lower weight and size • Energy consumption as little as 1/20 of hydraulic • Can reduce fuel consumption by 3-5% • Contains no oil • Better feel when driving • Reduced rattling noise • Disadvantages • Cost • Low force output – only currently suitable for small cars • 42V may allow the system to be used in heavier vehicles with larger tire contact patches • Now present in 2002 Saturn Vue, Honda Civic SI, Honda Insight

  15. Future Work • Further develop systematic method • Determine levels of modeling and information needed at each • Relate measures of performance to customer’s wishes • Continue with power steering example • Continue contacts with Ford, NSK

  16. Questions?

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