Analysis of the magnetic field for MR damper working in shear mode

Biswal, Titikshya; Rao, Lokavarapu Bhaskara

doi:10.1504/ijstructe.2016.073678

Cited by 5 publications

(4 citation statements)

References 6 publications

(6 reference statements)

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“…According to the magnetic field distribution of an MRD [30], the magnetic field outside the two ends of the piston is weak; hence, it can be ignored. In a non-magnetic field, the Coulomb damping force…”

Section: Mechanical Model Of Mrdmentioning

confidence: 99%

Effects of micron-sized iron particles on friction and wear behaviors of seals used in a magnetorheological damper: analysis and experiment

Song¹,

Peng²,

Zhang³

et al. 2019

Smart Mater. Struct.

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This study investigates friction and wear properties of rod seals used to prevent leakage of base oil in magnetorheological (MR) dampers. As the first step, a non-piston MR damper (MRD) model is considered for the analysis of both the frictional force and three-body abrasive wear of seals in MRD. Three different seals; O-ring, step ring, and glyd ring seals are adopted for the analysis and experimental tests. In order to conduct the friction and wear testing, a new type of in-house experimental apparatus consisting of an electrical cylinder, pressure sensor and gravity sensor is established. Subsequently, the friction coefficients and wear losses of the seals are evaluated as a function of operation time to validate the feasibility of the derived friction and wear models. To investigate the variation of the seals within MR fluid domain, morphological scanning electron microscopy images such as contacting and worn surfaces are observed and discussed. In addition, the energy-dispersive spectroscopy images are investigated after wearing the seal to observe the changes in size and shape of iron particles which are randomly distributed in MR fluid.

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Section: Mechanical Model Of Mrdmentioning

confidence: 99%

Effects of micron-sized iron particles on friction and wear behaviors of seals used in a magnetorheological damper: analysis and experiment

Song¹,

Peng²,

Zhang³

et al. 2019

Smart Mater. Struct.

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“…When the external fileds are removed, the storage modulus of the MRE can return to the original state. The transformation process described above can be done whithin milliseconds (Biswal and Rao, 2016;Yang et al, 2019;Morillas and de Vicente, 2020). Due to their ability of continuously, rapidly, and reversible changeing in their mechanical properties under the control of an external magnetic field, MRE have wide-ranging applications in many areas such as seismic resistance in buildings (Selvaraj and Ramamoorthy, 2020;Yang et al, 2020;Zhao et al, 2021), vibration damping in vehicles (Sun et al, 2017;Du et al, 2020;Jin et al, 2020;Rocca and Russo, 2021), and precision instruments (Golini et al, 1999;Xing et al, 2015;Choopani et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental research on the mechanical properties of magnetorheological elastomers based on PDMS

Huang,

Li,

Ruan

2023

Front. Mater.

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Magnetorheological Elastomers (MREs) are smart materials with the ability to modulate their mechanical properties by changing the external magnetic fields, offering extensive potential for applications requiring variable stiffness and damping devices. A comprehensive mechanical model that explains the influence of loading conditions on the performance of MRE is crucial for understanding their intrinsic mechanisms during operation, and for the design, analysis, and improvement of intelligent energy dissipation and vibration control devices based on MRE. In this study, a four-parameter mechanical model was established to reveal the intrinsic mechanisms about the effects of external magnetic fields, loading frequency, and strain amplitude on the storage modulus, loss modulus, equivalent stiffness, and equivalent damping of MRE materials. The dynamic mechanical properties of the MRE materials prepared from carbonyl iron powder and PDMS were tested, and parameter identification of the established model was performed. The comparison results between the theoretical model analysis and the testing results demonstrated that the proposed mechanical model effectively characterizes and predicts the mechanical behavior of MRE materials. Furthermore, based on the prepared MRE materials, a stiffness-controllable energy dissipator operating in shear mode was designed and fabricated, and the mechanical performance of the shear energy dissipator was experimentally evaluated. This research provides a basis and guidance for the design and mechanical performance analysis of devices based on MRE, confirming the feasibility of MRE materials as core components in intelligent energy dissipation devices.

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“…Therefore, analyzing the damper efficiency usually starts by examining and modeling its magnetic circuit system. Numerous studies have analyzed the magnetic field by solving Ampere's and Maxwell's equations in 2D and 3D (Purandare et al 2019), (Biswal and Rao 2016), (Li and Yang 2020), (Hemantha and Arun 2018), (Zheng et al 2014). For example, Purandare et al analyzed the magnetic field generated in the damper by adopting the finite element (FE) method using COMSOL Multiphysics, and their model was validated by the magnetic circuit theory (Purandare et al 2019).…”

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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Analysis of the magnetic field for MR damper working in shear mode

Cited by 5 publications

References 6 publications

Effects of micron-sized iron particles on friction and wear behaviors of seals used in a magnetorheological damper: analysis and experiment

Effects of micron-sized iron particles on friction and wear behaviors of seals used in a magnetorheological damper: analysis and experiment

Theoretical and experimental research on the mechanical properties of magnetorheological elastomers based on PDMS

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

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