Geometry optimization of a magnetorheological clutch operated by coils

Bucchi, Francesco; Forte, Paola; Frendo, Francesco

doi:10.1177/1464420716665650

Cited by 12 publications

(12 citation statements)

References 39 publications

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“…Dimension optimization of the clutches with MR fluid can be found in two previous articles (Horvath and Torőcsik, 2011;Bucchi et al, 2017). In both, the optimization was aimed to achieve the largest possible transmitted torque of the clutch, while in Bucchi et al (2017) emphasis was put on the magnetorheological fluid gap shape, and the optimization was conducted while using the finite element method. However, in Horvath and Torőcsik (2011) the inner radius was emphasized, while the optimization was based on the simple analytical method and a simulation procedure.…”

Section: Literature Studymentioning

confidence: 99%

Selection of Materials Used in Viscous Clutch With ER Fluid Working in Special Conditions

et al. 2019

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This article presents considerations regarding materials used to fabricate a hydraulic clutch with an ER fluid operating in non-standard working conditions. The hydraulic clutch was a subassembly of the device used for exerting a controlled force on the stationary object. This clutch was driven by an electric motor. The force was controlled by changing the shear stresses in the ER fluid. Shear stresses were changed in two ways: by changing the angular velocity of the electric motor and by changing the high voltage applied to the electrodes located on the driving part and the driven part of the clutch. The increase in these stresses caused an increase in the torque transmitted and an increase in the pressure force. In order to construct the clutch, mathematical models based on the Bingham model were developed, which took into account the influence of temperature and humidity on the shear stress in the ER fluid, allowing calculation of the clutch performance. In addition, numerical calculations of the temperature distribution inside the clutch were carried out using the ANSYS program because of the intense heat generation during the clutch operation. The developed mathematical models were used to optimize the clutch. The aim of the optimization was to obtain a high transmitted torque with small dimensions of the clutch, taking into account the thermal capacity of the clutch. Based on the optimization results, a prototype of a hydraulic clutch with an ER fluid was designed and made, assuming that for metal materials their anti-corrosion properties are the most important, since the presence of conductive metal oxides causes electrical breakdowns. The plastics used in the clutch prototype were mainly evaluated for insulating properties and high temperature resistance. When choosing the ER fluid, its sensitivity to temperature and humidity as well as durability were taken into account. The clutch prototype has been tested on a specially built test rig. The test results confirmed the proper selection of both construction materials and ER fluids. Based on the results of these tests, guidelines for the construction of clutches with ER fluids were formulated.

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Section: Literature Studymentioning

confidence: 99%

Selection of Materials Used in Viscous Clutch With ER Fluid Working in Special Conditions

et al. 2019

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“…Moreover, instead of relying on material specifications and technical data provided by the commercial MR fluid manufacturer, the MR fluid used in the present work was characterized experimentally in a rheometer. Bucchi et al 7 performed geometrical optimization of the MR fluid clutch by analyzing the magnetic flux density distribution in the clutch using finite element method in the FEMM software. The MR fluid has also been used as a core in the metal matrix composite sandwich beam by Allien et al 8 to suppress the vibration using semiactive control.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of magnetorheological fluid and its application in a twin-tube valve mode automotive damper

Desai

Acharya

Jamadar

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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The change in rheological properties of smart materials like magnetorheological fluid when brought under the influence of a magnetic field can be utilized to develop magnetorheological devices where the output has to be continuously and quickly varied using electronic control interface. In the present study, magnetorheological fluid is synthesized and used as a smart fluid in a twin-tube magnetorheological damper operating in valve mode. The behavior of the magnetorheological fluid is experimentally characterized in a rheometer and mathematically modeled using Herschel–Bulkley model. The parameters of the Herschel–Bulkley model are expressed as polynomial functions of strength of the magnetic field in order to find the shear stress developed by the magnetorheological fluid at any given strength of the magnetic field applied. The magnetorheological damper, which was designed for application in a passenger van, is tested in the damper testing machine. The performance of the damper at different damper velocities and current supplied is studied. The range of values for the parameters of the experimental testing are chosen to emulate the actual conditions of operation in its intended application. Nondimensional analysis is performed, which links magnetorheological fluid rheological properties and geometrical parameters of magnetorheological damper design with the force developed by the damper. Finite element method magnetics is used to find the strength of the magnetic field at the fluid flow gap. Analytical methods are used to calculate the damper force developed due to the field-dependent yield stress and compared with experimental force values. The resulting dynamic range of the magnetorheological damper is also assessed.

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“…Nevertheless, the resistance force of the MR torque transfer devices can be enhanced by reducing the gap size between the pair of sliding plates, but this gap size cannot be reduced below a limited value. [21][22][23][24] MRFs extend their application to devices such as dampers. MR damper (MRD) developed by Cook et al 25 contains a bypass valve with porous media.…”

Section: Introductionmentioning

confidence: 99%

“…Their brake is capable of producing a torque of 441 Nm, which is higher than the required torque (430 Nm). Bucchi et al 24 have investigated the effect of MRF gap shape in the design of an MR clutch. They have deliberated two MRF gap shapes, namely single cylinder and multi-disc, and two different coil positions, namely internal and external.…”

Section: Introductionmentioning

confidence: 99%

Design and development of a wedge shaped magnetorheological clutch

Singh

Thakur

Sarkar

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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This paper presents a novel drum magnetorheological clutch design having a wedge shaped boundary. The converging film formed due to the direction of motion of the magnetorheological clutch and the inclination of the wedge planes helps to produce the pressure generating mechanism in the magnetorheological grease film. The resistance force developed due to this mechanism in the proposed case exceeds that of the conventional drum clutch. The proposed wedge shaped drum magnetorheological clutch consists of bimetallic discs made up of aluminium and mild steel. Mild steel disc has a certain number of inclined sliders shaped like a wedge at its boundary, which is immersed in the magnetorheological grease. The yield stress of the magnetorheological grease varies as a function of the magnetic field created by electric current passing through the electromagnet. Bingham model has been employed in the present study to analyse theoretically the torque generated by wedge-shaped drum magnetorheological clutch. The proposed magnetorheological drum clutch with wedge shaped boundary and conventional drum clutch have been designed and fabricated with similar material parameters and magnetic circuits. The experiment has been performed for the different current values (0 A, 0.25 A and 0.52 A). Torque results are plotted and compared for both cases. Experimental results suggest that the proposed wedge shaped drum magnetorheological clutch produces more torque than the conventional drum magnetorheological clutch, and thus it has better performance.

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Geometry optimization of a magnetorheological clutch operated by coils

Cited by 12 publications

References 39 publications

Selection of Materials Used in Viscous Clutch With ER Fluid Working in Special Conditions

Selection of Materials Used in Viscous Clutch With ER Fluid Working in Special Conditions

Synthesis of magnetorheological fluid and its application in a twin-tube valve mode automotive damper

Design and development of a wedge shaped magnetorheological clutch

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