Design Analysis and Experimental Evaluation of an MR Fluid Clutch

Lee, Usob; Kim, Dohyun; Hur, Nahmkeon; Jeon, Doyoung

doi:10.1106/ex6x-y4qq-xq5l-8jjv

Cited by 86 publications

(42 citation statements)

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“…One of the most recent and promising technologies in vehicle damper design is implementing Magnetorheogical (MR) fluids. These smart fluids have the capability to continuously and rapidly change their rheological behavior (viscosity) under applied magnetic field [1,2]. Due to these unique characteristics, MR based dampers can provide variable damping force semi-actively by varying the applied magnetic field (varying current), thus they have the capability to control vibration in a wide range of road conditions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of magnetic flux in magneto-rheological damper

2019

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Magnetorheological materials are a class of smart substances whose rheological properties can rapidly be varied by application of a magnetic field. The proposed damper consists of an electromagnet and a piston immersed in MR fluid. When current is applied to the electromagnet, the MR fluid solidifies as its yield stress varies in response to the applied magnetic field. Hence, the generation of a magnetic field is an important phenomenon in MR damper. In this research, the magnetic field generated in the damper was analyzed by applying finite element method using COMSOL Multiphysics and was validated using magnetic circuit theory. A quasi-static, 2D-Axisymmetric model was developed using parametric study by varying current from 0-3 A and the magnetic flux density change generated in the fluid flow gap of MR fluid due to external applied current was evaluated. According to the analytical calculations magnetic flux density generated at MR fluid gap was 0.64 Tesla and when calculated using FEA magnetic flux density generated was 0.61 Tesla for 1A current. There is a difference of 4.8% in the simulated results and analytically calculated results of automotive MR damper due to non linear BH curve consideration in Finite element analysis over linear consideration of BH relation in magnetic circuit theory.Nomenclature

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Section: Introductionmentioning

confidence: 99%

Analysis of magnetic flux in magneto-rheological damper

2019

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“…As a first stage of the development of the MR fluid clutch (MRFC), many researchers [7][8] have developed single disk-type (or single cylindrical) clutches as shown in Fig. 1 This material has developed to improve characteristics of the conventional MR fluids, for example, sedimentation of particles.…”

Section: Introductionmentioning

confidence: 99%

Design and Development of Compact Magnetorheological Fluid Clutch (CMRFC) with Multi-layered Disks and Micro-sized Gaps

Kikuchi

Otsuki

Furusho

et al. 2010

J. Soc. Rheol., Jpn

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There is a strong demand for a human-machine-coexistent machine, e.g. a power-assist system or a computeraided rehabilitation system, in the context of the super-aging society. In such a human-machine-coexistent system, it is important to guarantee hardware-level safety by utilizing human-friendly actuators. In this paper, we developed two types of compact MR fluid clutches (CMRFC) for human-friendly actuators, which performs about 5Nm torque by applying 1A current and have two different gap-size (50 mm and 100 mm). We tested their static torque. First, we used a conventional MR fluid as a working material of the CMRFCs. Then we used new MRF, which consist of nanosized (104 nm

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“…Such fluid exhibits unusual characteristics in that their rheological properties can be continuously and reversibly changed within milliseconds by solely applying or removing magnetic fields. This interesting property has inspired the design of a large variety of MR devices in various engineering applications such as MR valves [3,4], shock absorbers and dampers [5,6], and engine mounts and clutch systems [7,8].…”

Section: Introductionmentioning

confidence: 99%

Design, Analysis, Prototyping, and Experimental Evaluation of an Efficient Double Coil Magnetorheological Valve

Long

Huang

et al. 2014

Advances in Mechanical Engineering

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A double coil magnetorheological (MR) valve with an outer annular resistance gap was designed and prototyped. The finite element modeling and analysis of double coil MR valve were carried out using ANSYS/Emag software, and the optimal magnetic field distribution and magnetic flux density of the double coil MR valve were achieved. The mechanism of the pressure drop was studied by building a mathematical model of pressure drop in the double coil MR valve. The proposed double coil MR valve was prototyped and its performance was experimentally evaluated. The new MR valve design has improved the efficiency of double coil MR valve significantly.

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Design Analysis and Experimental Evaluation of an MR Fluid Clutch

Cited by 86 publications

References 0 publications

Analysis of magnetic flux in magneto-rheological damper

Analysis of magnetic flux in magneto-rheological damper

Design and Development of Compact Magnetorheological Fluid Clutch (CMRFC) with Multi-layered Disks and Micro-sized Gaps

Design, Analysis, Prototyping, and Experimental Evaluation of an Efficient Double Coil Magnetorheological Valve

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