Characterization analysis of a MR damper

Berasategui, Joanes; Elejabarrieta, María Jesús; Bou-Ali, M. Mounir

doi:10.1088/0964-1726/23/4/045025

Cited by 11 publications

(5 citation statements)

References 24 publications

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“…Some interesting references on the applications of active-fluids in dampers or shock absorbers can be found in [77][78][79][80][81][82] for ERFs and in [83][84][85][86][87][88][89][90][91][92][93] for MRFs. Additionally, Zhu et al [94] published a magnificent review on the structure design and its analysis of magnetorheological fluid dampers.…”

Section: Active Dampersmentioning

confidence: 99%

Complex Fluids in Energy Dissipating Systems

Galindo-Rosales

2016

Applied Sciences

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Abstract:The development of engineered systems for energy dissipation (or absorption) during impacts or vibrations is an increasing need in our society, mainly for human protection applications, but also for ensuring the right performance of different sort of devices, facilities or installations. In the last decade, new energy dissipating composites based on the use of certain complex fluids have flourished, due to their non-linear relationship between stress and strain rate depending on the flow/field configuration. This manuscript intends to review the different approaches reported in the literature, analyses the fundamental physics behind them and assess their pros and cons from the perspective of their practical applications.

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Section: Active Dampersmentioning

confidence: 99%

Complex Fluids in Energy Dissipating Systems

Galindo-Rosales

2016

Applied Sciences

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“…However, such emitted heat remains trapped inside the damper casing and may change the properties of the MR fluid (Zhu et al 2012). Relying on the previous outfails and seeking simplicity in the machining process, scholars intend to use external magnetic field excitation as a feasible solution rather than internal excitation (Sassi et al 2018) (Berasategui et al 2014). The magnetic flux generated by the external excitation system has to penetrate the damper cylinder wall to control the MRF behavior.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the damping effect of MRF damper using an external magnetic excitation system

Badri,

Alhams,

Sassi

et al. 2023

Mater. Res. Express

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The magnetic field generated by the damper's magnetic circuit governs the yield stress value of the Magnetroholgical Fluid (MRF) damper and hence its damping effect. This paper contributes to the literature on the development of MRF dampers by introducing a new design feature to improve the damper's performance. The presented novel feature tends to amplify the magnetic field value and concentrate its flux within the MR fluid region. The excitation sources consist of 12 coils placed in radial directions surrounding the MRF to focus the energizing magnetic effects. However, the search for efficient solutions is not only focused on generating more energy but also on minimizing its loss. Therefore, a metallic ring was placed around the coils to close the magnetic circuit, guide the flux lines, and avoid any energy dispersion to the surrounding air. As a proof of concept, two materials were tested for the surrounding ring: plastic acrylonitrile butadiene styrene (ABS) and mild steel. The performance of both solutions was assessed experimentally with a Gaussmeter and numerically by using a model developed via COMSOL Multiphysics. Both techniques confirmed the efficiency of the solution based on a steel ring in preventing the flux dispersion into the surrounding air. In addition, an increase of the excitation current from 0 to 5A was found to elevate the magnetic field by 35%, compared with the ABS ring. In the second step, a test rig was designed and built to investigate the damping efficiency of the MRF experimentally. The testing apparatus consisted of a sliding-bearing mechanism connected to a variable speed motor. The damping effect was assessed based on the force and displacement data provided by a linear variable displacement transducer (LVDT) and a force cell. Damping forces were observed at a constant frequency of 0.36 Hz (22 rpm) when the testing system and the attached damper were functioning smoothly away from its resonant frequency. Moreover, the magnetic field excitation current was elevated from 0 A to 5 A with a 1 A step. Again, the metallic ring was found to produce a 112% greater damping coefficient than the case of the plastic ring when the excitation current reached 5A.

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“…The second MR damper ( Fig. 4) used a mixed mode [13]. Its design consisted of two rods with fluid circulation through an annular gap (48 mm diameter and 0.75 mm gap).…”

Section: Introductionmentioning

confidence: 99%

Magnetorheological damper behaviour in accordance with flow mode

Berasategui

Gómez

Martinez‐Agirre

et al. 2018

Eur. Phys. J. Appl. Phys.

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The objective of this article is to determine the optimal flow mode in an MR damper to maximize its performance. Flow mode is one of the main design issues in an MR damper, as it determines the velocity profile and the pressure drop across the gap. In this research, two MR dampers were designed and manufactured with two flow modes: valve and mixed. The response of these two dampers was compared experimentally. Additionally, the experimental tests were correlated by theoretical results that were obtained considering the rheological behaviour of the MR fluid, the shear stress distribution in the gap, and the damper movement. Interestingly, the obtained results suggest that flow mode is not a significant parameter for determining the behaviour of a MR damper.

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Characterization analysis of a MR damper

Cited by 11 publications

References 24 publications

Complex Fluids in Energy Dissipating Systems

Complex Fluids in Energy Dissipating Systems

Enhancing the damping effect of MRF damper using an external magnetic excitation system

Magnetorheological damper behaviour in accordance with flow mode

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