Physics Of Semi Active Suspension System

2910 WordsApr 6, 201512 Pages
...or paste your text here Optimization of Sequential damping in Semi-active Suspensions with Magneto-rheological fluid to control of Vibrations and Acoustics *Sourabh Joshi1, **Piyush Nandwal2 1. Acropolis Technical Campus, Indore (M.P.) In the case of semi-active suspensions with sequential damping, the damping forces are zero or rather very small as long as the sprung mass is moving away from its static equilibrium position and suddenly increases when the system is returning to the static equilibrium position. The basic idea of this semi-active control strategy is to balance the elastic force by the damping force in order to reduce or even to cancel the forces transmitted through the suspension as long as the spring and elastic forces…show more content…
Semi-active control systems combine the best features of the passive and active ones. They have almost the same environmental robustness, mechanical simplicity and low cost as passive devices and can offer the adaptability of active control systems without requiring the associated large power sources. In this paper the effect of semi-active suspension with Magneto-rheological fluid to control the damping characteristic of the system and balanced logic on which the system works is presented. The damping characteristics are controlled by modulation of fluid-flow orifices, dry friction forces, electric or magnetic field applied to electro rheological or magneto rheological fluid dampers. The balance logic is assumed to be achieved with a variable dry friction damper controlled by the modulation of the normal force applied on the friction plates. For the models with semi-active dual-rate dampers, the value of the equivalent suspension damping coefficient is a function of the relative velocity of the sprung mass with respect to the wheel subsystem. Key Words: Transmissibility factor, Magneto-rheological fluid, Sequential damping INTRODUCTION Isolation of passenger from induced shock and vibration is the important task of the suspension of any ground vehicle. Most suspensions have passive springs and dampers with rather limited vibration isolation performance, both for linear and nonlinear restoring or damping characteristics. Their transmissibility
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