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TECHNICAL PAPERS

Internal Organizational Measurement for Control of Magnetorheological Fluid Properties

[+] Author and Article Information
John R. Lloyd

Department of Mechanical Engineering,  Michigan State University, East Lansing, MI 48824lloyd@egr.msu.edu

Miquel O. Hayesmichel, Clark J. Radcliffe

Department of Mechanical Engineering,  Michigan State University, East Lansing, MI 48824

J. Fluids Eng 129(4), 423-428 (Nov 21, 2006) (6 pages) doi:10.1115/1.2436588 History: Received June 19, 2006; Revised November 21, 2006

Magnetorheological (MR) fluids change their physical properties when subjected to a magnetic field. As this change occurs, the specific values of the physical properties are a function of the fluid’s time-varying organization state. This results in a nonlinear, hysteretic, time-varying fluid property response to direct magnetic field excitation. Permeability, resistivity and permittivity changes of MR fluid were investigated and their suitability to indicate the organizational state of the fluid, and thus other transport properties, was determined. High sensitivity of permittivity and resistivity to particle organization and applied field was studied experimentally. The measurable effect of these material properties can be used to implement an MR fluid state sensor.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Visualization of particle organization of a magnetorheological fluid as a function of applied magnetic field strength, H

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Figure 2

MR fluid experimental facilities for measurements of properties in static and moving fluids

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Figure 3

Schematic diagram of the three voltmeter method to compute inductance: experimental system, equivalent circuit diagram, and vector diagram

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Figure 4

Initial measured inductance versus applied field results showing an external, indirect, sensor yields small measured changes in inductance

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Figure 5

Schematic diagram of experimental facility for capacitance and resistance measurements

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Figure 6

Schematic diagram of equipment setup for MR fluid capacitance and resistance measurements

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Figure 7

Measurements of parallel equivalent capacitance of the MR fluid as a function of applied field

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Figure 8

Measurements of series equivalent capacitance of the MR fluid as a function of applied field

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Figure 9

Measurements of parallel equivalent resistance of the MR fluid as a function of applied magnetic field

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Figure 10

Measurements of series equivalent resistance of the MR fluid as a function of applied magnetic field

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Figure 11

Relative property changes in permeability, permittivity, and resistivity of the MR fluid as a function of applied magnetic field

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