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TECHNICAL PAPERS

A New Bypass Magnetorheological Fluid Damper

[+] Author and Article Information
Gregory H. Hitchcock, Xiaojie Wang, Faramarz Gordaninejad

Department of Mechanical Engineering,  University of Nevada, Reno, Nevada 89557

J. Vib. Acoust 129(5), 641-647 (Jul 12, 2006) (7 pages) doi:10.1115/1.2775514 History: Received January 25, 2006; Revised July 12, 2006

This study presents theoretical and experimental investigations of a novel external bypass, fail-safe, magnetorheological fluid (MRF) damper. A fail-safe MRF damper is referred to as a device that retains a minimum required damping capacity in the event of a power supply or electronic system failure. The new MRF device has a simple design, is compact, is capable of generating a considerable dynamic force range, and can be sized for specific vibration control applications. The theoretical formulation is developed based on the Herschel–Bulkley constitutive model for an annular flow. Experimental results are obtained to demonstrate the validity of the theoretical analysis.

Copyright © 2007 by American Society of Mechanical Engineers
Topics: Fluids , Dampers , Force , Valves , Design , Damping
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References

Figures

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Figure 1

Schematic of the bypass MRF damper

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Figure 2

The proposed bypass MRF valve

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Figure 3

Partial section view of the proposed annular MRF valve

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Figure 4

Fluid flow and the direction of the magnetic field at the MRF valve region

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Figure 5

Schematic of the velocity profile in the bypass MRF valve. r1 and r2 are the inner and outer cylinder radii, respectively.

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Figure 6

Experimental setup for characterization of the bypass MRF damper

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Figure 7

Comparison between theoretical and experimental results of the bypass MRF damper for 0.32cm amplitude at maximum velocity of 0.5cm∕s

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Figure 8

Damping force versus frequency for the bypass MRF damper at 0.32cm input amplitude, and 0 and 2A electric input currents

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Figure 9

Energy dissipated per cycle versus applied current for different input amplitudes at 0.25Hz frequency

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Figure 10

Energy dissipated per cycle versus frequency for different applied currents at 0.64cm amplitude

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Figure 11

Energy dissipated per cycle versus amplitude for different applied currents at 0.25Hz frequency

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Figure 12

Equivalent damping coefficient versus applied current for different excitation amplitudes at 0.25Hz frequency

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Figure 13

Equivalent damping coefficient versus excitation frequency for different applied currents at 0.64cm amplitude

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Figure 14

Equivalent damping coefficient versus excitation amplitude for different applied currents at 0.25Hz frequency

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Figure 15

Theoretical and experimental pressure drops versus frequency comparison for the bypass MRF valve at 0.69cm input amplitude

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