Dynamic Analysis of Sphere-Like Iron Particles Based Magnetorheological Damper for Waveform-Generating Test System

Oh, Jong-Seok; Shul, Chang Won; Kim, Tae Hyeong; Lee, Tae-Hoon; Son, Sung-Wan; Choi, Seung–Bok

doi:10.3390/ijms21031149

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…A MR damper can be used to generate a shockwave profile, as shown in Figure 7 [ [40][41][42]. Because the electric devices in submarines are damaged by shockwaves caused by noncontact explosions, impact examinations should be implemented to verify shock survivability according to shock loading.…”

Section: Military and Railway Applicationmentioning

confidence: 99%

“…Oh et al designed a control logic for a MR damper and evaluated its control performance [41]. An experimental apparatus for impact tests was constructed, and field-dependent dual shockwave profiles were successfully evaluated [41,42]. The vibrations of a 15-DOF high-speed railway system cause poor ride quality and track abrasion.…”

Section: Military and Railway Applicationmentioning

confidence: 99%

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Applications of Magnetorheological Fluid Actuator to Multi-DOF Systems: State-of-the-Art from 2015 to 2021

Sohn

Choi

2022

Actuators

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This review article presents various multi-DOF application systems that utilize smart magnetorheological (MR) fluid. It is well known that MR fluid has been actively studied and applied in many practical systems such as vehicle suspension dampers. The design requirements for the effective applications of MR fluid include geometry optimization, working principles, and control schemes. The geometry optimization is mostly related to the size minimization with high damping force, while the working principles are classified into the shear mode, the flow mode, and the squeeze mode depending on the dominant dynamic motion of the application system. The control schemes are crucial to achieve final targets such as robust vibration control against disturbances. It should be addressed that advanced output performances of MR application systems heavily depends on these three requirements. This review article presents numerous application systems such as sandwich structures, dampers, mounts, brakes, and clutches, which have been developed considering the three design requirements. In addition, in this article some merits and demerits of each application system are discussed to enable potential researchers to develop more effective and practical MR application systems featuring the multi-DOF dynamic motions.

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Section: Military and Railway Applicationmentioning

confidence: 99%

Section: Military and Railway Applicationmentioning

confidence: 99%

Applications of Magnetorheological Fluid Actuator to Multi-DOF Systems: State-of-the-Art from 2015 to 2021

Sohn

Choi

2022

Actuators

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“…For experiments, in valves, for example, the viscosity of the fluid increases under a magnetic field, causing a resistance against the velocity of a fluid and based on the fluid's driving force and its active volume [11,34]. In dampers, the magnetic field strength affects the damping force as shock absorbers by rearranging chains and increasing the yield stress inside the fluid [11,35]. In both cases, however, the ability to retain particle chains and/or clusters (which could consequentially mean the difference between the success and failure of applications) is dependent on the fluid flow (caused by external forces) and the strength of the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of a Pair of Paramagnetic Janus Particles under a Uniform Magnetic Field and Simple Shear Flow

2021

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We numerically investigate the dynamics of a pair of circular Janus microparticles immersed in a Newtonian fluid under a simple shear flow and a uniform magnetic field by direct numerical simulation. Using the COMSOL software, we applied the finite element method, based on an arbitrary Lagrangian-Eulerian approach, and analyzed the dynamics of two anisotropic particles (i.e., one-half is paramagnetic, and the other is non-magnetic) due to the center-to-center distance, magnetic field strength, initial particle orientation, and configuration. This article considers two configurations: the LR-configuration (magnetic material is on the left side of the first particle and on the right side of the second particle) and the RL-configuration (magnetic material is on the right side of the first particle and on the left side of the second particle). For both configurations, a critical orientation determines if the particles either attract (below the critical) or repel (above the critical) under a uniform magnetic field. How well the particles form a chain depends on the comparison between the viscous and magnetic forces. For long particle distances, the viscous force separates the particles, and the magnetic force causes them to repel as the particle orientation increases above the configuration’s critical value. As the initial distance decreases, a chain formation is possible at a steady orientation, but is more feasible for the RL-configuration than the LR-configuration under the same circumstances.

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“…Because the so-called MR effect is reversible and has an instantaneous control over the rheological properties, MR fluid has been utilized in various devices such as dampers [4][5][6], valves [7], mounts [8,9], and brakes [10]. Furthermore, because it can easily control high damping force, MR damper has been developed to reduce unwanted vibrations in an extensive range of industries including the automobile [11][12][13][14], electrical appliance [15,16], civil engineering [17][18][19][20], aerospace [21,22], and military industries [23][24][25][26]. However, even though MR dampers work very effectively in various vibration control areas, in terms of commercialization, several problems related to manufacturing cost and temperature rise have been continuously reported due to their internal magnetic coil structures.…”

Section: Introductionmentioning

confidence: 99%

A new design of magnetic circuits in magnetorheological dampers for simple structure subjected to small stroke and low damping force

Lee¹,

Kang²,

Kim³

et al. 2020

Smart Mater. Struct.

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A magnetorheological (MR) damper is popularly applied for vibration control owing to its fast response and the easy controllability of the field-dependent damping force. However, most of the existing MR dampers developed so far possess design complexity and a high manufacturing cost due to complicated coil structures. To resolve these drawbacks of the existing MR dampers, a novel magnetic circuit positioned separately from the piston head of MR damper with a simple structure is proposed in this work. As a first step, a design configuration using the operating principle of the magnetic circuit is demonstrated, and subsequently, the magnetic analysis of MR damper is carried out through an analytical approach and the finite element method. In the magnetic analysis, the magnetic flux density is numerically calculated at various piston locations with different applied currents. After determining the principal design parameters of the proposed MR damper, experimental validation to demonstrate the concept of the new magnetic circuit is performed. The effect of the piston stroke length on the damping force is evaluated as a function of the current. In addition, it is discussed that the proposed MR damper can provide much higher control range of the damping force than conventional types of MR dampers in a low level of damping force.

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Dynamic Analysis of Sphere-Like Iron Particles Based Magnetorheological Damper for Waveform-Generating Test System

Cited by 5 publications

References 25 publications

Applications of Magnetorheological Fluid Actuator to Multi-DOF Systems: State-of-the-Art from 2015 to 2021

Applications of Magnetorheological Fluid Actuator to Multi-DOF Systems: State-of-the-Art from 2015 to 2021

Dynamics of a Pair of Paramagnetic Janus Particles under a Uniform Magnetic Field and Simple Shear Flow

A new design of magnetic circuits in magnetorheological dampers for simple structure subjected to small stroke and low damping force

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