Aero495 Magnetorheological Fluids MRF

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Aero495 Magnetorheological Fluids MRF

  1. 1. Magnetorheological Fluids Dr. Mohammad Tawfik
  2. 2. MR Fluids How do they work? • Externally applied magnetic field in a direction normal to the fluid flow direction form dipoles in the iron particles • Magnetic poles start attracting each others to the direction of the field, hence forming chains • The chains then form a skeleton within the fluid, which gains the fluid controllable yield stress
  3. 3. Why MR technology? Required Materials to synthesize an MR fluid: • Lithium grease  General purpose oil  Micron-sized iron particles
  4. 4. MR Fluids
  5. 5. Rabinow and Winslow 1950’s
  6. 6. MR Damper Fabrication Prototype Damper
  7. 7. Seat Shock Absorbers
  8. 8. Modes of Operation
  9. 9. Damper – Valve Mode
  10. 10. Damper – Valve Mode
  11. 11. Clutch – Sheer Node
  12. 12. Structural Damping
  13. 13. Yield Sheer Stress Variations
  14. 14. Rate of Strain with Filed
  15. 15. Homework #4 • Summarize chapter 4 in no more than 5 pages • Present a derivation for the equations whenever it seems appropriate.

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