Performance Analysis of Magnetorheological Damper with Folded Resistance Gaps and Bending Magnetic Circuit

Liu, Leping; Xu, Yinan; Zhou, Feng; Hu, Guoliang; Yu, Lie

doi:10.3390/act11060165

Cited by 9 publications

(4 citation statements)

References 34 publications

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“…where r 3 is the outer radius of outer cylinder; L 2 is the length of base yoke, L 3 is the length of lower guide seat, t m is the width of base inner cylinder yoke, Z 1 is the outer radius of According to formulas (2) to formulas (10), the magnetic induction intensity B I , B II and B ′ II at the piston damping gap, the outside damping gap of the base and the inside damping gap of the base can be calculated respectively [36,37],…”

Section: Magnetic Circuit Designmentioning

confidence: 99%

Design and experiment study of a novel dual-channel independent-coil magnetorheological grease damper

Wang,

Li,

Xue

et al. 2024

Smart Mater. Struct.

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In order to address the issue of reduced damping force dynamic range in magnetorheological (MR) damper caused by the high zero-field viscosity of MR grease, known for its sedimentation stability, this paper introduces a novel dual-channel independent-coil MR damper (DCICMRD). Firstly, the dual-channel configuration and the magnetic circuit structure of independent coils were meticulously designed, and a genetic algorithm was employed to conduct multi-objective optimization of the structural parameters for DCICMRD. The optimization results indicate that all performance metrics of the damper post-optimization exhibit improvements exceeding 15%. Then, the theocratical model of the damping force for DCICMRD under three operational modes are established, and the output damping force of various input currents for different operating mode is obtained. Finally, the DCICMRD was manufactured and subjected to dynamic performance testing. The results revealed that the damping force dynamic range in Mode III, i.e., dual-channel structure, can achieve approximately 15 times, whereas Mode I, i.e., traditional single-channel structure, only attains approximately 9 times. The aforementioned research holds significant implications for expanding the further engineering applications of MR dampers.

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Section: Magnetic Circuit Designmentioning

confidence: 99%

Design and experiment study of a novel dual-channel independent-coil magnetorheological grease damper

Wang,

Li,

Xue

et al. 2024

Smart Mater. Struct.

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show abstract

“…Innovative structures are proposed to better improve the performance of magnetorheological dampers. A new MR damper with folded resistive gap and bent magnetic circuit is designed with a multi-stage folded ring intermittent structure, and the results show that the damping force and dynamic range are improved by 55.82% and 62.21%, respectively, compared with the conventional MR damper (Liu et al, 2022b). A new magnetorheological dampener incorporates aluminum foil bubble insulation in the cavity in order to avoid the increase of the magnetorheological fluid temperature.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental research of stepped bypass magnetorheological damper

Yang

Zhu

Song

et al. 2023

Journal of Intelligent Material Systems and Structures

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In order to meet the damper performance requirements of heavy vehicles, a stepped-bypass magnetorheological damper is proposed. The mathematical model of damping force is deduced, and its mechanical properties are numerically simulated. Then the damper is manufactured, and the mechanical properties of the stepped bypass magnetorheological damper are experimentally studied. The simulation are consistent with the experimental results. The damper is optimized by orthogonal optimization design test. Finally, it is concluded that the maximum output damping force of the stepped bypass magnetorheological damper is about 4500 N, and the adjustable coefficient K is about 5.4. After optimization, the damping force of the stepped bypass magnetorheological damper is increased by at least 5.3%, and the adjustable coefficient K is at least 1.37 times that before optimization, which is 13% wider than that before optimization.

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“…For instance, introducing current wiring to the coils required deep-holing drilling all the way along the piston rod which requires precious machining to ensure straightness and service finish (Sassi et al 2018). In addition, the internally excited MRF damper non-flux gap is considered long (Liu et al 2022). In order to increase the effective flux-gap the number of coils should be increased.…”

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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Performance Analysis of Magnetorheological Damper with Folded Resistance Gaps and Bending Magnetic Circuit

Cited by 9 publications

References 34 publications

Design and experiment study of a novel dual-channel independent-coil magnetorheological grease damper

Design and experiment study of a novel dual-channel independent-coil magnetorheological grease damper

Design and experimental research of stepped bypass magnetorheological damper

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

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