Effect of particle shape in magnetorheology

Vicente, J. De; Vereda, Fernando; Segovia-Gutiérrez, Juan Pablo; Morales, M.P.; Hidalgo‐Álvarez, R.

doi:10.1122/1.3479045

Cited by 149 publications

(88 citation statements)

References 51 publications

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“…Figure 3 shows the X-ray diffraction pattern of plate-like iron particles recorded at room temperature. The XRD result matches with the reported value of Fe given in the literature [23]. The magnetization measurement is carried out using a homebuilt magnetometer.…”

Section: Mr Fluid and Mr Dampersupporting

confidence: 71%

Damping Force Tracking Control of MR Damper System Using a New Direct Adaptive Fuzzy Controller

Phu

Shah

Choi

2015

Shock and Vibration

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This paper presents a new direct adaptive fuzzy controller and its effectiveness is verified by investigating the damping force tracking control of magnetorheological (MR) fluid based damper (MR damper in short) system. In the formulation of the proposed controller, a model of interval type 2 fuzzy controller is combined with the direct adaptive control to achieve high performance in vibration control. In addition, ∞ (H infinity) tracking technique is used in building a model of the direct adaptive fuzzy controller in which an enhanced iterative algorithm is combined with the fuzzy model. After establishing a closed-loop control structure to achieve high control performance, a cylindrical MR damper is adopted and damping force tracking results are obtained and discussed. In addition, in order to demonstrate the effectiveness of the proposed control strategy, two existing controllers are modified and tested for comparative work. It has been demonstrated from simulation and experiment that the proposed control scheme provides much better control performance in terms of damping force tracking error. This leads to excellent vibration control performance of the semiactive MR damper system associated with the proposed controller.

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Section: Mr Fluid and Mr Dampersupporting

confidence: 71%

Damping Force Tracking Control of MR Damper System Using a New Direct Adaptive Fuzzy Controller

Phu

Shah

Choi

2015

Shock and Vibration

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“…As the magnetic field increases and the particles exhibit nonlinear magnetization, the yield stress is predicted to scale as B 3/2 and eventually become independent of B as the particle magnetization saturates (Ginder et al 1996). These scalings have been confirmed experimentally for spherical particles (Chin et al 2001;de Vicente et al 2010), though some studies have reported a somewhat weaker dependence on B (Bossis et al 2002;Bossis and Lemaire 1991). In matrix fluids composed of viscoplastic grease, Rankin et al (1999) reported that the field-induced dynamic yield stress scales with B x , where x decreases from about 1.5 to 0 as the magnetic field increases and the magnetization of the particles saturates.…”

Section: Effects Of Magnetic Field and Agingmentioning

confidence: 66%

Magnetorheology in an aging, yield stress matrix fluid

2012

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Field-induced static and dynamic yield stresses are explored for magnetorheological (MR) suspensions in an aging, yield stress matrix fluid composed of an aqueous dispersion of Laponite ® clay. Using a custom-built magnetorheometry fixture, the MR response is studied for magnetic field strengths up to 1 T and magnetic particle concentrations up to 30 v%. The yield stress of the matrix fluid, which serves to inhibit sedimentation of dispersed carbonyl iron magnetic microparticles, is found to have a negligible effect on the field-induced static yield stress for sufficient applied fields, and good agreement is observed between field-induced static and dynamic yield stresses for all but the lowest field strengths and particle concentrations. These results, which generally imply a dominance of inter-particle dipolar interactions over the matrix fluid yield stress, are analyzed by considering a dimensionless magnetic yield parameter that quantifies the balance of stresses on particles. By characterizing the applied magnetic field in terms of the average particle magnetization, a rheological master curve is generated for the fieldinduced static yield stress that indicates a concentration-magnetization superposition. The results presented herein will provide guidance to formulators of MR fluids and designers of MR devices who require a field-induced static yield stress and a dispersion that is essentially indefinitely stable to sedimentation.

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“…The formation of internal organized structures under external magnetic field application is aligned with the change of viscoelastic characteristics. The storage, G', and loss, G'', moduli provide quantitative information about the magnetically induced structures in a wide range of time and frequency [17]. The dependence of G' and G'' on the angular frequency, Z, within the LVR (J = 5 × 10 -4 in our experiments) for 40 wt.…”

Section: Results and Discusionmentioning

confidence: 83%

Core-shell Structured Polypyrrole-coated Magnetic Carbonyl Iron Microparticles and their Magnetorheology

Sedlačík¹,

Pavlı́nek²,

Sáha³

et al. 2011

AIP Conference Proceedings

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Abstract. The substantial sedimentation problem of magnetorheological (MR) suspensions, due to the large density mismatch between dispersed particles and carrier medium, is a significant obstacle for their broader applications. The present paper reports the MR properties and enhanced sedimentation stability of novel core-shell structured particles with carbonyl iron as a core and polypyrrole as a shell layer dispersed in silicone oil. The coating morphology was analyzed via scanning electron microscopy and magnetic properties via vibrating sample magnetometry. The steady shear flow and small-amplitude dynamic oscillatory shear measurements were carried out to show improved MR performance. The sedimentation test showed positive role of polymeric coating, as well.

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Effect of particle shape in magnetorheology

Cited by 149 publications

References 51 publications

Damping Force Tracking Control of MR Damper System Using a New Direct Adaptive Fuzzy Controller

Damping Force Tracking Control of MR Damper System Using a New Direct Adaptive Fuzzy Controller

Magnetorheology in an aging, yield stress matrix fluid

Core-shell Structured Polypyrrole-coated Magnetic Carbonyl Iron Microparticles and their Magnetorheology

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