&lt;title&gt;Magneto-rheological fluid shock absorbers for HMMWV&lt;/title&gt;

Gordaninejad, Faramarz; Kelso, Shawn P.

doi:10.1117/12.384562

Cited by 22 publications

(17 citation statements)

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“…The cylinder body is constructed of non-ferrous stainless steel, as is the piston shaft. The change in apparent viscosity [1,3,8] of the MR fluid, the source of controllable damping, occurs within the confines of the piston. As such, the electromagnet is integral to the piston and supply wires for the electromagnetic coil exit the damper at the far end of the piston shaft.…”

Section: Description Of Technologymentioning

confidence: 99%

<title>Experimental characterization of commercially practical magnetorheological fluid damper technology</title>

Kelso¹

2001

SPIE Proceedings

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As technologies for magnetorheological (MR) fluid hardware further evolve towards commercial adoption, the appeal for simpler, more cost-effective solutions becomes evident. While the skills involved in methods of manufacturing and costreduction efforts for mass production lie with the manufacturing community, practical and cost-effective MR technologies must first exist. As part of a 'whole approach' MR solution, the MR damper technology presented in this paper illustrates the development of a fast-response, low-power, cost-effective solution. Fundamentally, a competitive 'whole approach' active or semi-active MR solution can be viewed as system of separate components: parameter sensing, intelligent control, power delivery, and MR hardware technology. The development of any one single component should not successfully evolve without the addressing the cost efficiency and commercialization concerns of the other three. The MR hardware component should be predictable in performance behavior, capable of high damping force at minimal power, and fast in time response to complement simplified control schemes. The design effort is further challenged to meet these requirements within a simple, cost-effective package that holds commercial development appeal.This research includes the characterization of a new prototype MR damper including a description of the device technology, characterization test results and current work. It is evident by these results that this MR technology, comprising simple, commercial-off-the-shelf (COTS) components where possible, presents an attractive, practical and cost effective component of the 'whole approach' MR solution.

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Section: Description Of Technologymentioning

confidence: 99%

<title>Experimental characterization of commercially practical magnetorheological fluid damper technology</title>

Kelso¹

2001

SPIE Proceedings

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“…This results in a value of electrical resistance correspondent to the total length of magnet wire required. Only one Figure 5, inductance of the coil, L C , can be represented as [10]: (2) whose units are in Henries, with radius in terms of inches. The geometry term, K n , in Equation (2) is defined as [10]: (3) Where r is the mean radius, t is thickness, and l is length of the coil along the centerline.…”

Section: The Electromagnetic Circuit Of the Mr Dampermentioning

confidence: 99%

“…It is assumed that the same number of coils and type of magnet wire is used for both cases, hence equivalent values for electrical resistance. The inductance of the electromagnetic circuit in Figure 5 is calculated directly from Equation (2). Inductance for the series electromagnetic circuit of Figure 6 must account for the effects of mutual inductance in addition to the series addition of three individual coil inductances [5]: (4) Where L S is the summed inductance, L 1 is inductance of the first coil, L 2 the second, and L 3 the third.…”

Section: The Electromagnetic Circuit Of the Mr Dampermentioning

confidence: 99%

Precision Controlled Actuation and Vibration Isolation Utilizing Magnetorheological (MR) Fluid Technology

Kelso¹,

Blankinship²,

Henderson³

2001

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Precision controlled vibration isolation utilizing magnetorheological (MR) fluid technology for potential space optical applications, such as surveillance and directed energy, is addressed. This research includes the design, development and preliminary testing of a semiactive, proof-of-concept, MR vibration isolator. Base disturbances designed to produce payload vibration responses were employed in a single degree-of-freedom test apparatus. The MR vibration isolator served as the load-coupling element between the payload and the base disturbance input. The three-parameter isolator consists of two passive spring elements combined with one MR damping element. The MR damper control algorithm uses relative rate between damper cylinder and piston to dynamically vary the effective coefficient of damping. The result of this technology is ability to tune isolation frequency within a given range. Through intelligent modulation of the damping element alone, dynamic changes in both apparent stiffness and damping of the isolator are achieved. For applications where the ability to vary stiffness and damping would improve pointing accuracy and jitter control, this technology holds great appeal.

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“…MR fluid has found the most uses in transportation applications, including shock absorbers for automotive suspensions and heavy truck seats. Other uses of MR dampers have included their prototype application for controlling building motions during seismic excitation [2], real-time control of military vehicle suspensions [3], controlling gun recoil dynamics [4], and providing adjustability to mountain bike suspensions [5]. This increase in prototype system development is largely due to the success of research projects and through the efforts of Lord Corporation, which is the leader in the field of MR fluids and devices.…”

Section: Introductionmentioning

confidence: 99%

Efficient Test Procedures for Characterizing MR Dampers

Boggs

Borg

Ostanek

et al. 2006

Dynamic Systems and Control, Parts a and B

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The response of a magneto-rheological (MR) damper is often characterized by a force-velocity response plot from a sinusoidal input. These plots are created in a shock dynamometer in which one end of the damper is attached to a load frame and the other end is moved in a sine wave with a given peak velocity and frequency. The peak damper force from a series of sine wave tests of varying peak velocity is measured and plotted as discrete data points versus the relative velocity across the damper. This is a standard procedure for characterizing passive shock absorbers in the automotive industry.The validity of this characterization relies on the assumption that the damper is dominantly a velocity-dependent device. However, it is well-known that the internal dynamics of the damper depend not only on the velocity of the input, but also the frequency of the excitation. Therefore both velocity and frequency should be considered as independent parameters to achieve a more complete characterization of a MR damper's response under sinusoidal excitation.This paper investigates the dependence of the force response to both peak velocity and frequency, for several different MR dampers from a wide variety of applications. By treating the velocity and frequency as two independent parameters, a complete characterization of the damper's response under sinusoidal excitation can be characterized. After investigating how damper force varies with both peak velocity and frequency, efficient test procedures are recommended for future MR damper characterizations.

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<title>Magneto-rheological fluid shock absorbers for HMMWV</title>

Cited by 22 publications

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<title>Experimental characterization of commercially practical magnetorheological fluid damper technology</title>

<title>Experimental characterization of commercially practical magnetorheological fluid damper technology</title>

Precision Controlled Actuation and Vibration Isolation Utilizing Magnetorheological (MR) Fluid Technology

Efficient Test Procedures for Characterizing MR Dampers

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