Browse Publications Technical Papers 2018-01-1913

Regeneration Mode , Dissipation Mode, and Power Harvesting Both Electromagnetic and Magneto-Rheological Shock Absorbers 2018-01-1913

Electromagnetic and magneto-rheological dampers have established significant attention in latest years because their adaptability without large power sources, if they are worked as passive or semi-active damping devices. Electromagnetic dampers can be broadly classified into two different techniques to generate variable damping either mechanical system or electrical system. Mechanical system is composed of a permanent-magnet DC motor, a ball screw and a nut. Electrical system, if the main components of an electromagnetic damper are changed into coil and permanent magnet assemblies. Mechanical system and Electrical system of an electromagnetic damper and magneto-rheological damper are presented in this paper through two cases regeneration energy and dissipation energy. If the dampers generate electric load, they are worked in this case as passive devices. Otherwise, if the voltage applied to the dampers is turned on to generate variable damping rate according to different frequencies of excitation , they are worked in this case as semi-active devices. The simulated results of the present study are shown that: (i) For full passive case, the regeneration power of a mechanical system damper decreased with increasing the condenser capacity but damping rate increased significantly with increasing the condenser capacity. The regeneration power of an electrical system is dependent on permanent magnet array and coil windings array movements but magneto-rheological damper needs external device called generator that relates to coil to work this damper as a self-powered device. (ii) For semi-active case, the dissipation power in an electrical system and magnetorheological dampers is compared to determine which of them provide performance very well with minimum power required.


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