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WANG Enrong
YE Biaoming
School of Electric & Automation
Engineering,
Nanjing Normal University,
Nanjing 210042, China
MA Xiaoqing
Su Chunyi
Rakheja Subhash
Department of Mechanical &
Industrial Engineering,
Concordia University,
Montreal H3G 1M8, Canada |
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GENERATION OF
ASYMMETRIC
F-v CHARACTERISTICS FOR SYMMETRIC MR DAMPERS*
Abstract:
An asymmetric damping force generation algorithm is originally proposed to yield the asymmetric force-velocity characteristics for the symmetric magneto-rheological (MR) dampers. The command current is formulated in an asymmetric manner to excite the symmetric MR dampers by employing the “on-off” control law in response to the direction of velocity, and a smooth modulation function is developed without phase shift to suppress strong transients in the damping forces caused by the current-switching discontinuity. The effectiveness of the proposed algorithm is evaluated by analyzing the dynamic responses of a quarter-vehicle suspension system with a symmetric MR-damper by modulating the command current into the asymmetric manner. The simulation results show that the proposed algorithm could achieve a better compromise between the conflicting requirements of the asymmetric damping force ratio and the force-velocity curve smoothness, and the asymmetric damping MR-suspension design can ideally improve the road holding and ride performances of vehicle motion. The proposed algorithm can be generally incorporated with a controller synthesis to realize an intelligent vehicle suspension design with the symmetric MR dampers.
Key words:
Magneto-rheological (MR) fluids damper Asymmetric F-v characteristics
Smoothness Vehicle suspension
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