Abstract
This paper focuses on the synthesis and characterization of ferro fluid (smart fluid). The colloidal mixtures of magnetite in carrier fluid were made by different chemical processes. The characteristics like particle size, turbidity, density, viscosity, and damping were studied. The average particle size after repeated filtering measured to 12 nm. The turbidity variation was found to be almost negligible. The damping coefficient varied from 0.2418 Ns/m to 0.8348Ns/m in the magnetic field. The effect of magnetic field on viscosity was studied on in house made viscometer and calibrated with the existing Redwood viscometer. It was possible to change the viscosity with the change in magnetic field. Such smart fluid could be used in a semi active shock absorber of a vehicle for better performance. Keywords: Ferro fluid, viscosity, magnetic field, Smart fluid.
Highlights
Conventional vehicle suspensions achieve the road induced vibration isolation through passive means such as springs and dampers or passive shock absorbers
The variation in damping characteristics of the shock absorber is done by instantly changing the viscosity of the liquid magnet, used as absorber oil, by changing the magnetic field which should be sensitive to road disturbances
The ferro fluid prepared in house contains nano particles
Summary
Conventional vehicle suspensions achieve the road induced vibration isolation through passive means such as springs and dampers or passive shock absorbers. With the semi active suspension, the dynamic sag due to body roll in turns can be two to three times smaller. Semi active suspension system started in the early 1980’s with the introduction of the first variable damping shock absorbers. These variable dampers typically changed the damping from soft to firm and vice versa, through a manual or slow adaptive control (Hrovat, 1997). The variation in damping characteristics of the shock absorber is done by instantly changing the viscosity of the liquid magnet, used as absorber oil, by changing the magnetic field which should be sensitive to road disturbances.
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