Abstract

Magnetic functional fluids are produced by adding needle-like magnetic particles whose long axis is about 100 nm and short axis is 25 nm to magnetic compound fluids which are mixture of magnetic fluid and magnetorheological fluid. Damping property can be controlled by changing mixture ratio of both spherical magnetic particles and needle-like magnetic particles. Basic damping property is investigated experimentally by using a prototype damper. When the total volume fraction of magnetic particles is constant, the damping force of the damper is stronger with increase of the volume fraction of needle-like magnetic particles.

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