MAGNETORHEOLOGICAL FLUIDS

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MAGNETORHEOLOGICAL FLUIDS

• ADITYA RAMAKRISHNAN
• MEEN 3344
• FALL 2004

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WHAT ARE MR FLUIDS?

• Dispersions of Particles made of a soft magnetic
  material in a carrier oil.
• Carbonyl Iron Particles in Silicone Oil
• A typical MR fluid contains 2040 by volume of
  relatively pure, soft iron particles,
• Other Versions made out of Ceramics, or Synthetic
  Polymers.

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INTRODUCTION

• Viscosity controlled by the application of a
  Magnetic Field.
• Viscosity directionally proportional to the
  strength of Magnetic field.
• Viscosity change is achieved in a fraction of a
  millisecond.
• Viscosity can be altered several times with fluid
  properties unaltered.
• Variety of applications.
• Numerous Advantages

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More info - MR FLUIDS?

• Tiny Iron Particles align with Magnetic Field.
• Fluid turns pasty and feels very stiff.
• Reverts to liquid when Magnetic Field is removed.
• The weight and space required by the coils to
  produce magnetic field is a setback.

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APPLICATIONS

• Vibration Control
• Active Damping Controls
• Brakes
• Clutches
• Stabilizing Leg Brace
• Regulating Flow
• Exercise Equipment
• Other Applications

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Variable damping system based on
magnetorheological fluid sponges can help control
the vibratory motion of a household washing
machine during its spin cycle. Damping is
switched on as the drum passes through resonance
and off again at the highest speeds for optimum
vibration isolation.
Magnetorheological shocks
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References

• http//www.liquidsresearch.com/products/magnet.asp
  
• http//www.ima.umn.edu/industrial/99-2000/ginder.h
  tml
• http//www.pitt.edu/ppp/engres/
• http//cee.uiuc.edu/sstl/gyang2/Ch2.pdf
• http//www.motortrend.com/future/spied/112_0304_c6
  /index3.html
• www.sensorsmag.com/ articles/0202/30/main.shtml
• http//journalsonline.tandf.co.uk/app/home/contrib
  ution.asp?wasp1f99bfcqyp6kynaakq5rreferrerparen
  tbacktosearcharticlesresults,1,10homemain,1,1
• http//www.djc.com/news/ae/11151055.html