Geometric Analysis in an MR Fan Clutch

2011 ◽  
Vol 239-242 ◽  
pp. 1731-1734 ◽  
Author(s):  
Jian Zuo Ma ◽  
Guo Chao Wang ◽  
Dong Zuo
Keyword(s):  
Angular Velocity ◽  
Yield Strength ◽  
Geometric Analysis ◽  
Control Torque ◽  
Load Torque ◽  
Mr Fluid ◽  
Mr Fluids ◽  
Torque Transmission ◽  
Fluid Properties ◽  
Transmission Ability

A magnetorheological (MR) fan clutch is introduced. Based on Herschel-Bulkley model, the equation of transmission torque developed by MR fluids is derived to compute the torque transmission ability in the MR fan clutch. The necessary gap and the need of MR fluid volume between two parallel circular discs of the clutch are carried out. The results indicate that, the transmission torque of the MR fan clutch developed rapidly depend on the yield strength of MR fluid. The necessary gap and the volume for the MR fan clutch can be obtained based on MR fluid properties, the desired control torque ratio, the angular velocity and load torque of the clutch.

Internal Organizational Measurement for Control of Magnetorheological Fluid Properties

2006 ◽  
Vol 129 (4) ◽  
pp. 423-428 ◽  
Author(s):  
John R. Lloyd ◽  
Miquel O. Hayesmichel ◽  
Clark J. Radcliffe
Keyword(s):  
Magnetic Field ◽  
Physical Properties ◽  
High Sensitivity ◽  
Time Varying ◽  
Measurable Effect ◽  
Mr Fluid ◽  
Fluid State ◽  
Mr Fluids ◽  
Fluid Properties ◽  
Field Excitation

Magnetorheological (MR) fluids change their physical properties when subjected to a magnetic field. As this change occurs, the specific values of the physical properties are a function of the fluid’s time-varying organization state. This results in a nonlinear, hysteretic, time-varying fluid property response to direct magnetic field excitation. Permeability, resistivity and permittivity changes of MR fluid were investigated and their suitability to indicate the organizational state of the fluid, and thus other transport properties, was determined. High sensitivity of permittivity and resistivity to particle organization and applied field was studied experimentally. The measurable effect of these material properties can be used to implement an MR fluid state sensor.

Thermal and tribological performance of graphite flake based magnetorheological fluid under shear mode clutch

2021 ◽  
pp. 1-24
Author(s):  
Manish Kumar Thakur ◽  
Chiranjit Sarkar
Keyword(s):  
Research Work ◽  
Magnetorheological Fluid ◽  
Tribological Performance ◽  
Graphite Flake ◽  
Shear Mode ◽  
Torque Sensor ◽  
Test Rig ◽  
Mr Fluid ◽  
Mr Fluids ◽  
Torque Transmission

Abstract In this research work, graphite flake has been used as an additive in magnetorheological (MR) fluid to improve its thermal and tribological performance. MR fluids with varying amounts of graphite flakes (0.5, 1, 2, 3, 4, and 5 wt%) are prepared to show effective thermal and tribological performance. A test rig is developed with a DC motor, torque sensor, and MR clutch operated in a shear mode to test the torque transmission. Results show the lubrication effects of graphite flakes in MR fluid. Torque transmission is improved in on-state and off-state using graphite flakes based MR fluid as compared to conventional MR fluid. Heating of MR clutch is also reduced with the graphite flakes based MR fluid. Wear marks and damages are decreased significantly with the increased amount of graphite flakes as found in surface roughness tests. SEM and EDS are used to characterize the worn surfaces. This research provides information about the effectiveness of graphite flakes in the MR clutch to improve the device's performance.

Performance Simulation on a Magnetorheological Valve Module Using Three Different Commercial Magnetorheological Fluid

2015 ◽  
Vol 1123 ◽  
pp. 35-41
Author(s):  
Burhanuddin Ichwan ◽  
Saiful Amri Mazlan ◽  
Fitrian Imaduddin ◽  
Ubaidillah ◽  
Hairi Zamzuri
Keyword(s):  
Pressure Drop ◽  
Simulation Studies ◽  
Fluid Type ◽  
Mr Fluid ◽  
Performance Simulation ◽  
Mr Fluids ◽  
Fluid Properties ◽  
Magnetorheological Effect ◽  
Radial Gap ◽  
Magnetorheological Valve

Simulation studies on a new concept of modular Magnetorheological (MR) valve using annular-radial gap combination are discussed in this paper. This study predicts and compares the performance of MR valve module with three different commercial kind MR fluids namely the MRF-122EG, MRF-132DG, and MRF140CG. Magnetorheological effect in various types of MR fluid is analyzed using finite element method (FEM) software in term of simulation magnetic field density within the valve module. The approximated functions of permeability and field dependent yield stress for each kind of MR fluid are derived and presented in this paper as a prerequisite for simulation works. The result has shown that the highest pressure drop rating is reached by applying an MR fluid type MRF140CG, for another kind has shown smallest of pressure drop rating because of the ability to produce the achievable pressure drop highly depends on MR fluid properties.

MAGNETORHEOLOGICAL FLUIDS AND THEIR PROPERTIES

2005 ◽  
Vol 19 (01n03) ◽  
pp. 593-596 ◽  
Author(s):  
J. M. HE ◽  
J. HUANG
Keyword(s):  
Magnetic Field ◽  
Yield Strength ◽  
Rheological Properties ◽  
Yield Stress ◽  
Applied Magnetic Field ◽  
Magnetorheological Fluids ◽  
Mr Fluid ◽  
Variable Yield ◽  
Mr Fluids

Magnetorheological (MR) fluids are materials that respond to an applied magnetic field with a change in their rheological properties. Upon application of a magnetic field, MR fluids have a variable yield strength. Altering the strength of the applied magnetic field will control the yield stress of these fluids. In this paper, the method for measuring the yield stress of MR fluids is proposed. The curves between the yield stress of the MR fluid and the applied magnetic field are obtained from the experiment. The result indicates that with the increase of the applied magnetic field the yield stress of the MR fluids goes up rapidly.

A Semi-Active, High-Torque, Magnetorheological Fluid Limited Slip Differential Clutch

2006 ◽  
Vol 128 (5) ◽  
pp. 604-610 ◽  
Author(s):  
Barkan Kavlicoglu ◽  
Faramarz Gordaninejad ◽  
Cahit Evrensel ◽  
Alan Fuchs ◽  
George Korol
Keyword(s):  
Response Time ◽  
Three Dimensional ◽  
Fast Response ◽  
Design Development ◽  
Element Analysis ◽  
Mr Fluid ◽  
Bingham Plastic ◽  
Mr Fluids ◽  
Torque Transmission ◽  
And Performance

The design, development, and performance characterization of a magnetorheological (MR) fluid clutch for automotive limited slip differential (LSD) applications is presented in this study. The controllability of MR fluids provides an adjustable torque transmission and slippage for the LSD application. Three-dimensional electromagnetic finite element analysis (FEA) is performed to optimize the magnetic circuit and clutch design. Based on the results obtained from the FEA, the theoretical torque transfer capacity of the clutch is predicted utilizing Bingham-Plastic constitutive model. The clutch is characterized at different velocities and electromagnet electric input currents. Both the torque transfer capacity and the response time of the clutch were examined. It was demonstrated that the proposed MR fluid LSD clutch is capable of transferring controllable high torques with a fast response time.

Analysis of Torque in Magnetorheological Rotary Brake

2011 ◽  
Vol 239-242 ◽  
pp. 2297-2301 ◽  
Author(s):  
Ping Wang ◽  
Jin Huang ◽  
Shu Hua Wei
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Applied Magnetic Field ◽  
Bingham Model ◽  
Operational Principle ◽  
Mr Fluids ◽  
Torque Transmission ◽  
Transmission Ability

A magnetorheological (MR) rotary brake is a device that transmits torque by the shear stress of the MR fluids. In this paper, Bingham model is used to describe the constitutive characteristics of MR fluids subject to an applied magnetic field. The operational principle of the MR rotary brake is introduced. The torque transmitted by MR fluids is analyzed to compute the torque transmission ability in the MR rotary brake.

Design and Performance of a MR Torque Transfer Device

Aerospace ◽  
2005 ◽  
Author(s):  
Kevin Molyet ◽  
Constantin Ciocanel ◽  
Hideki Yamamoto ◽  
Nagi Naganathan
Keyword(s):  
Magnetic Field ◽  
Element Analysis ◽  
Mr Fluid ◽  
Mr Fluids ◽  
Active Portion ◽  
Fluid Properties ◽  
Predicted Values ◽  
And Performance ◽  
And Behavior ◽  
Transfer Device

Magnetorheological (MR) fluids possess the unique ability to undergo dramatic and nearly completely reversible changes in their rheological properties under the application of a magnetic field. These controllable fluids can serve as quiet, rapid interfaces between electronic controls and mechanical systems. One area of application is to use these fluids in torque transfer devices, such as clutches and brakes. After determining MR fluid properties and behavior using a rheometer, a parallel disk type MR clutch was successfully developed, which utilized a stationary electromagnetic coil. Finite element analysis was used to design the coil and clutch assembly in order to maximize the magnetic field generated within the MR fluid. The resulting magnetic field was uniform over the active portion of the clutch, easily controllable by adjusting the current passing through the coil, and provided a large range of field strength values. The experimentally measured output torque was generally in good agreement with predicted values. This work will detail the design considerations and methodology used to develop this clutch, which can be extended to the design of other MR devices.

Shear Transmission of Magnetorheological Fluid in Fan Clutch

2012 ◽  
Vol 233 ◽  
pp. 84-87
Author(s):  
Jiu Hua Wang ◽  
Lian Cheng Ren ◽  
Zhen Zhen Lei
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Applied Magnetic Field ◽  
Magnetorheological Fluid ◽  
Bingham Model ◽  
Operational Principle ◽  
Mr Fluids ◽  
Torque Transmission ◽  
Magneto Rheological ◽  
Transmission Ability

A magneto-rheological (MR) fan clutch is a device that transmits torque by the shear stress of the MR fluids. In this paper, Bingham model is used to describe the constitutive characteristics of MR fluids subject to an applied magnetic field. The operational principle of the MR clutch is introduced. The torque transmitted by MR fluids is analyzed to compute the torque transmission ability in the MR clutch. The results show that with the increase of the applied magnetic field, the torque developed by MR fluids goes up rapidly.

Experimental and Analytical Investigations of Dynamic Characteristics of Magnetorheological and Nanomagnetorheological Fluid Film Journal Bearing

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Dimitrios A. Bompos ◽  
Pantelis G. Nikolakopoulos
Keyword(s):  
Dynamic Characteristics ◽  
Magnetic Particles ◽  
Dynamic Properties ◽  
Fluid Film ◽  
Impact Excitation ◽  
Magnetostatic Field ◽  
Mr Fluid ◽  
Mr Fluids ◽  
Fluid Properties ◽  
Bearing Design

The integrity and reliability of a rotor depend significantly on the dynamic characteristics of its bearings. Bearing design has been altered in many ways in order to achieve improvement in terms of damping and stiffness. A promising field in terms of vibration control and overall performance improvement for the journal bearings is the use of smart lubricants. Smart lubricants are fluids with controllable properties. A suitable excitation, such as an electric or a magnetic field, is used as a means of smart fluid properties control. Magnetorheological (MR) fluids consist one category of lubricants with controllable properties, thanks to magnetic particles inside the fluid volume. In this case of material, a magnetostatic field affects the apparent viscosity of the fluid by aligning the magnetic particles into chains. In this work, an MR fluid is produced. An MR fluid film bearing was constructed, which is capable of exciting the MR fluid. These bearing performances are examined experimentally and its dynamic properties are evaluated using an impact excitation method for an SAE-10 W lubricant as well as with the produced MR fluid both in its active and in its inactive state.

Analysis of a Magnetorheological Transmission for Fan Clutch

2011 ◽  
Vol 287-290 ◽  
pp. 173-177 ◽  
Author(s):  
Jin Huang ◽  
Li Juan Fu ◽  
Li Rong Zhong
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Applied Magnetic Field ◽  
Mr Fluids ◽  
Torque Transmission ◽  
Magneto Rheological ◽  
Transmission Ability

A magneto-rheological (MR) fan clutch is a device that transmits torque by the shear stress of the MR fluids. In this paper, the torque transmitted by MR fluids is analyzed to compute the torque transmission ability in the disk-type MR fan clutch. The results show that with the increase of the applied magnetic field, the torque developed by MR fluids goes up rapidly. The driven speed of the fan clutch can be adjusted continuously by changing the applied magnetic field.

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