Smart Adaptive Suspension System using MR Fluid

The objective is to develop a smart adaptive suspension system that dynamically varies the damping coefficient to achieve better control and improve the ride quality of an automobile. Adaptive/semi-active systems can only change the viscous damping coefficient of the shock absorber, and do not add energy to the suspension system. Though limited in their intervention, semi-active suspensions are less expensive to design and consume far less power. In recent times, research in semi-active suspensions has continued to advance on their capabilities, narrowing the gap between semi-active and fully active suspension systems. The various ways of achieving semi-active suspension systems are through solenoid/valve actuated, MR fluid and ER fluid mechanisms. Among the ways mentioned above, we chose to realize our objective using MR fluid damper system due to its favourable properties which are discussed later. It consists of an ultrasonic sensor to detect uneven terrain that needs specific hardening/softening of the suspension. The input to the system also includes the speed sensor. Once the central controller calculates the required stiffness of the suspension, it actuates a magnetic circuit that produces a magnetic field around the damper. The damper is filled with Magneto-Rheological fluid (MR Fluid) containing small iron filings. The magnetic field manipulates the non-Newtonian effects of the MR fluid to change the stiffness of the suspension system. This concept can be implemented for vibration control applications from automobiles to railway vehicles and civil structures. This system can be used in modern anti earth quake building base construction.