Experimental investigations and characterization of shear and squeeze mode magnetorheological brake

Patil, Satyajit R.; Lohar, Rajendra A.

doi:10.1007/s40430-018-1457-1

Cited by 13 publications

(14 citation statements)

References 20 publications

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“…MR brakes are preferred over conventional hydraulic brakes because the stopping distance and time can be significantly reduced. Patil and Lohar 221 experimentally investigated MR brakes in shear and squeeze flow modes of operation.…”

Section: Applicationsmentioning

confidence: 99%

Magnetorheology: a review

2020

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Section: Applicationsmentioning

confidence: 99%

Magnetorheology: a review

2020

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“…Huang et al (2002) theoretically studied the design method of cylindrical MRF brakes and derived the torque equation of MRF brakes, which provided a theoretical basis for the design of cylindrical MRF brakes. Patil and Lohar (2018) designed an extrusion type MRF brake, analyzed and calculated the output torque of the brake. Rizzo (2017) introduced a novel multi-gap MRF clutch, and a three-dimensional finite element model was used to study and design the system.…”

Section: Introductionmentioning

confidence: 99%

A novel magnetorheological braking system with variable magnetic particle volume fractioncontrolled by utilizing shape memory alloy

Xiong

2022

Journal of Intelligent Material Systems and Structures

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To address the shortcomings of decreasing shear yield stress of magnetorheological fluid due to temperature increase, magnetic saturation phenomenon under the action of a strong magnetic field, and decreasing performance of magnetorheological brake due to magnetic particle settling, a braking system of variable particle volume fraction of magnetorheological fluid modulated by shape memory alloy spring is proposed, which solves the shortcomings of constant particle volume fraction magnetorheological brakes. The brake temperature rises and automatically increases the volume fraction of magnetorheological fluid, leading to increase in the braking torque and ensuring stable braking performance at high temperatures. The magnetorheological fluid particle settling stability is enhanced, and energy consumption at idle is reduced. Based on the shape memory effect of shape memory alloy, the relationship between the output displacement of shape memory alloy spring and temperature, squeezing pressure and volume fraction of magnetic particles is established. Based on the microscopic body-centered tetragonal structure of magnetorheological fluid, the relationship between the volume fraction of magnetic particles and the magnetic permeability of magnetorheological fluid was established. Based on the rheological characteristics of magnetorheological fluid, the relationship between the braking torque of magnetorheological fluid and the magnetic permeability and the volume fraction of magnetic particles is established; and the finite element method was applied to simulate and analyze it. The results show that the magnetic permeability increases with the increase of the volume fraction of magnetic particles and the braking torque increase with the increase of the volume fraction of magnetic particles during the evolution of the magnetorheological fluid microstructure from single chain to body-centered tetragonal structure. When the volume fraction of magnetic particles in the magnetorheological fluid increased from 15% to 45%, the magnetorheological brake torque increased to 10.1N·m, and the braking performance of the magnetorheological brake improved by 14.3%. The experimental and theoretical analyses provide a theoretical basis for the design and manufacture of magnetorheological fluid brakes with variable particle volume fractions.

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“…Despite the fact that MR brakes have been investigated repeatedly under compression-shear, many of the studies dealt with the stable characteristics of MR brakes under constant currents 19 – 23 , as briefly noted here. Patil et al have experimentally studied the influencing parameters of braking torque of MR brake in shear and squeeze mode 19 . Sarkar et al .…”

Section: Introductionmentioning

confidence: 99%

Transient behavior of compressed magnetorheological brake excited by step currents

Wang

Yong-ju

et al. 2021

Sci Rep

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Transient behavior of a magnetorheological brake excited by step currents under compression-shear mode has been experimentally studied. The results show that the amplitude of the applied current had little effect on the rising time of transient torque, while the rising time was significantly affected by the rotational speed, the compressive speed and the compressive strain position. The falling time of transient torque was independent of the amplitude of the applied current, the compressive speed and the compressive strain position, and it was affected by the rotational speed. The falling time of the transient torque was much shorter than the rising time by a step current. The transient process of MR brake applied as a step current was different from a stable process pre-applied at constant current in different particle chain structure forming processes. In addition, the compressive processes applied in one step current and randomly on/off current were compared and experimentally verified: the particle chains in two processes both experienced the same evolutionary of transient torque. The results achieved in this study should be properly considered in the design and control of magnetorheological brake under compression-shear mode.

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Experimental investigations and characterization of shear and squeeze mode magnetorheological brake

Cited by 13 publications

References 20 publications

Magnetorheology: a review

Magnetorheology: a review

A novel magnetorheological braking system with variable magnetic particle volume fractioncontrolled by utilizing shape memory alloy

Transient behavior of compressed magnetorheological brake excited by step currents

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