Automotive

Insight into Magnetorheological Shock Absorbers by Janusz Goldasz, Bogdan Sapiński

By Janusz Goldasz, Bogdan Sapiński

This ebook bargains with magnetorheological fluid thought, modeling and functions of car magnetorheological dampers. at the theoretical aspect a evaluate of MR fluid compositions and key elements affecting the features of those fluids is by way of an outline of current functions within the region of vibration isolation and flow-mode surprise absorbers particularly. As a majority of present magnetorheological units operates in a so-called circulation mode a serious evaluate is conducted in that regard. particularly, the authors spotlight universal configurations of flow-mode magnetorheological surprise absorbers, or so-called MR dampers which were thought of through the automobile for managed chassis functions. The authors specialize in single-tube dampers using a piston meeting with one coil or a number of coils and no less than one annular movement channel within the piston.

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Cars from the beginning of the 19th century featured a manually operated Bowden cable connected to friction pads on the vehicle (Dixon 2007). The 1933 Cadillac 355C V8 car featured a five-position ride control system that could be set by a driver (GM Heritage Center 1993). The system used four rotary vane (Houdaille-type) dampers which were popular at that time. The 1934 Packard Super Eight Convertible Victoria luxury vehicle included a similar three-position hydraulic ride control system. Next generations of adjustable systems incorporated pneumatically operated valves.

For example, the assembly can involve multiple coils in series or in parallel wound around the solid core (Gavin and Dobossy 2001). Although the piston usually involves one annular (primary) flow path, multiple parallel flow path configurations have been proposed and analysed, too (Carlson et al. 2009; Gavin 2001; Goldasz 2013a; Namuduri et al. 2001). The double gap configuration is renowned for the high turn-up ratio but not the highest force. Next, Oliver and Kruckemeyer (2002) described a piston assembly in which the coil was wound 5 3 1 6 4 2 Fig.

The rheology of the fluid is controlled by means of the magnetic field generated in the circuit by applying a current to the coil in the piston core. The magnetic flux induced by the coil passes through the core, enters the annulus, expands through the sleeve and returns back into the core through the annular gap—see Fig. 7. The other flux path is associated with the flux leakage into the cylinder (not shown) and the return path into the piston rod via the MR fluid in the rebound (rod-side) chamber.

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