MAGNETORHEOLOGICAL FLUIDS ADITYA RAMAKRISHNAN MEEN 3344 FALL 2004

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 20–40% by volume of relatively pure, soft iron particles, Other Versions made out of Ceramics, or Synthetic Polymers.

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

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.

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

Magnetorheological shocks 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.

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