Experimental analysis of magnetorheological dampers when subjected to impact and shock loading

Ahmadian, Mehdi; Norris, James A.

doi:10.1016/j.cnsns.2007.03.028

Cited by 78 publications

(59 citation statements)

References 10 publications

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“…Generally, MR fluid behaves like an ordinary Newtonian fluid, when exposed to a magnetic field, and the metal particles are guided by the magnetic field to form a chain-like structure and it becomes a grease state. MR fluid technology has been investigated in or applied to a variety of shock and vibration isolation systems, such as shock absorbers, clutches, polishing devices, actuators [2], hydraulic valves, gun recoil systems [3,4], railway vehicles [5,6], military suspension systems [7][8][9], and seismic isolation systems for civil infrastructures [10,11].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Circuit Design and Multiphysics Analysis of a Novel MR Damper for Applications under High Velocity

Zheng

Koo

et al. 2014

Advances in Mechanical Engineering

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A novel magnetorheological (MR) damper with a multistage piston and independent input currents is designed and analyzed. The equivalent magnetic circuit model is investigated along with the relation between magnetic induction density in the working gap and input currents of the electromagnetic coils. Finite element method (FEM) is used to analyze the distribution of magnetic field through the MR fluid region. Considering the real situation, coupling equations are presented to analyze the electromagneticthermal-flow coupling problems. Software COMSOL is used to analyze the multiphysics, that is, electromagnetic, thermal dynamic, and fluid mechanic. A measurement index involving total damping force, dynamic range, and induction time needed for magnetic coil is put forward to evaluate the performance of the novel multistage MR damper. The simulation results show that it is promising for applications under high velocity and works better when more electromagnetic coils are applied with input currents separately. Besides, in order to reduce energy consumption, it is recommended to apply more electromagnetic coils with relative low currents based on the analysis of pressure drop along the annular gap.

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Section: Introductionmentioning

confidence: 99%

Magnetic Circuit Design and Multiphysics Analysis of a Novel MR Damper for Applications under High Velocity

Zheng

Koo

et al. 2014

Advances in Mechanical Engineering

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“…In order to simplify the design procedure, maximum yield stress of MR fluid is assumed as 40 kPa. Using the above equations and repeated calculations, the damping force can be calculated using (15). The calculated controllable and viscous damping forces of the MR damper (at 2 m/s) are 504.9 kN and 300.9 kN, respectively.…”

Section: Design Of Mr Dampermentioning

confidence: 99%

“…( / ) MR can be obtained using (14) and (15). In order to obtain ( / ) , the flow velocity of annular duct without magnetic field can be derived with = ( ( )/ ): By substituting (19) for (15), the following equation was obtained:…”

Section: Design Of Mr Dampermentioning

confidence: 99%

“…Browne et al [16] also evaluated the impact damping performance of an MR damper. Although these works focused on the dynamic behavior of MR impact dampers, the maximum damping force range of their proposed MR dampers was relatively low [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…To account for the behavior of MR damper at high shear rates, Lee et al [11] used the Herschel-Bulkley shear model and Mao et al [12] used a nonlinear Bingham model based on loss factor and hydromechanical analysis. Ahmadian et al [13][14][15] studied an MR impact damper in gun recoil dynamics and free-flight drop test facilities. Browne et al [16] also evaluated the impact damping performance of an MR damper.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design and Analysis of a New Magnetorheological Damper for Generation of Tunable Shock‐Wave Profiles

Lee

Choi

2018

Shock and Vibration

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A new impact testing system with an integrated magnetorheological (MR) damper is proposed, and its dynamic characteristics are analyzed. The testing system consists of a velocity generator, impact mass, test mass, spring, and MR damper. In order to tune the dual shock-wave profile, a dynamic model was constructed, and the appropriate design parameters of the MR damper were then determined to produce the required damping force. Following this, an impact testing system was constructed to evaluate the design analysis and field-dependent dual shock-wave profiles. The experimental results of impact test showed that the dual shock-wave profile can be altered by changing the intensity of the magnetic field.

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Experimental and analytical study on pounding reduction of base‐isolated highway bridges using MR dampers

Guo

et al. 2009

Earthq Engng Struct Dyn

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SUMMARYPounding between adjacent superstructures has been a major cause of highway bridge damage in the past several earthquakes. This paper presents an experimental and analytical study on pounding reduction of highway bridges subjected to earthquake ground motions by using magnetorheological (MR) dampers. An analytical model, which incorporates structural pounding and MR dampers, is developed. A series of shaking table tests on a 1:20 scaled base-isolated bridge model are performed to investigate the effects of pounding between adjacent superstructures on the dynamics of the structures. Based on the test results, the parameters of the linear and the nonlinear viscoelastic impact models are identified. Performance of the semiactive system for reducing structural pounding is also investigated experimentally, in which the MR dampers are used in conjunction with the proposed control strategy, to verify the effectiveness of the MR dampers. Structural responses are also simulated by using the established analytical model and compared with the shaking table test results. The results show that pounding between adjacent superstructures of the highway bridge significantly increases the structural acceleration responses. For the base-isolated bridge model considered here, the semiactive control system with MR dampers effectively precludes pounding.

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Experimental analysis of magnetorheological dampers when subjected to impact and shock loading

Cited by 78 publications

References 10 publications

Magnetic Circuit Design and Multiphysics Analysis of a Novel MR Damper for Applications under High Velocity

Magnetic Circuit Design and Multiphysics Analysis of a Novel MR Damper for Applications under High Velocity

Design and Analysis of a New Magnetorheological Damper for Generation of Tunable Shock‐Wave Profiles

Experimental and analytical study on pounding reduction of base‐isolated highway bridges using MR dampers

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