|Document Type:||Master's Thesis|
|Name:||Christopher A. Pare|
|Title:||Experimental Evaluation of Semiactive Magneto- Rheological Suspensions for Passenger Vehicles|
|Degree:||Master of Science|
|Committee Chair:||Mehdi Ahmadian|
|Committee Members:||Douglas J. Nelson|
|William R. Saunders|
|Keywords:||semiactive, magnetorheological, skyhook, groundhook, damper, experimental, vehicle dynamics|
|Date of defense:||May 26, 1998|
|Availability:||Release the entire work immediately worldwide.|
This study experimentally evaluates the dynamic response of a single vehicle suspension incorporating a magneto-rheological (MR) damper. A full-scale two-degree-of-freedom (2DOF) quarter-car test apparatus has been constructed at the Advanced Vehicle Dynamics Lab at Virginia Tech to evaluate the response of a vehicle suspension under the different control schemes of skyhook, groundhook, and hybrid semiactive control. The quarter-car apparatus was constructed using materials from 80/20 Incorporated and a hydraulic actuation system from MTS. A dSPACE AutoBox was used both for controlling the MR dampers and acquiring data.
The first task was to understand the baseline dynamic response of the quarter-car system with only a passive damper. Next, the passive damper was replaced with a controllable MR damper. The control schemes of skyhook, groundhook, and hybrid semiactive control were applied to the MR damper. The physical response of the quarter-car with the different control schemes was then compared to the analytical prediction for the response, with favorable results. The response of the quarter-car with the semiactive damper was also compared to the response of the quarter-car with a passive damper, and the resulting limitations of passive damping are discussed.
Finally, the practical implications of this study are shown in a discussion of the physical implementation of the MR dampers in the Virginia Tech FutureCar, a full-size Chevrolet Lumina. Although the actual skyhook, groundhook, and hybrid semiactive control schemes were not implemented on the vehicle, the results were promising and generated several recommendations for future research.
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