Structure Simulation and Performance Test of Flexible Fixture Based on Magneto-Rheological Fluids

2014 ◽  
Vol 1027 ◽  
pp. 246-250
Author(s):  
Jun Jin Ma ◽  
Ding Hua Zhang ◽  
Bao Hai Wu ◽  
Ming Luo
Keyword(s):  
Magnetic Field ◽  
Performance Test ◽  
Great Influence ◽  
Experimental Results ◽  
External Compression ◽  
Mr Fluids ◽  
Structure Simulation ◽  
And Performance ◽  
Magneto Rheological ◽  
Good Agreement

To solve the precision manufacturing of thin-walled irregular-shaped workpiece, the MR fluids flexible fixture was designed and the simulation of device with compression structure was carried out to obtain performance parameters of device for optimizing the device. Then, some experimental test was implemented to verify the feasibility of device. The simulation and experimental results show that the current and coil turns have a great influence on magnetic field, and the shear stress of MR fluids are related with magnetic field and external compression force. The experimental results are in good agreement with simulation ones.

Design and Performance Analysis on MR-Shock Absorber

2014 ◽  
Vol 984-985 ◽  
pp. 648-655
Author(s):  
M.L. Brabin Nivas ◽  
T. Prabaharan ◽  
J. Libin ◽  
T. Bibin Jose
Keyword(s):  
Magnetic Field ◽  
Mr Damper ◽  
Fast Response ◽  
Damping Force ◽  
Clear Fluid ◽  
Carrier Fluid ◽  
Fluid Turbulence ◽  
Mr Fluids ◽  
And Performance ◽  
Magneto Rheological

Abst r a c t -Magneto rheological aqueous is an old advancing to the bazaar at top speed. Excellent appearance like fast response, simple interface amid electrical ability ascribe and automated ability output, and absolute controllability accomplish MRF technology adorable for abounding applications.The aim of this project is preparation of MR-fluids by using the different types of carrier fluid mixed with iron powder and stability and magnetic properties are analysed. Thesedimentation of iron particles can be reduced by using additives. The sedimentation can be analysed by boundary variation of the clear fluid to the fluid turbulence. The viscosity of smart fluid can be increased by varying the applied magnetic field.The performance of the MR-damper depends on the applied maximum magnetic field and the hydraulic circuit design. The MR-damper force by increasing the magnetic field can be analysed by sing the FEMM V4 Software.Damping force depends on the excitation of current and magnetic field.Key words: Rheological, magnetic field, damping force, FEMM, flux density

Structural Optimization Design of MR Fluid Clutch

2007 ◽  
Vol 546-549 ◽  
pp. 1673-1676 ◽  
Author(s):  
Wei Jia Meng ◽  
Zhan Wen Huang ◽  
Yan Ju Liu ◽  
Xiao Rong Wu ◽  
Yi Sun
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Optimization Design ◽  
Element Analysis ◽  
Mr Fluids ◽  
Magneto Rheological ◽  
Ferromagnetic Fluids ◽  
Ferromagnetic Particles

Magnetorheological (MR) fluids are suspensions of micron sized ferromagnetic particles dispersed in varying proportions of a variety of non-ferromagnetic fluids. MR fluids exhibit rapid, reversible and significant changes in their rheological (mechanical) properties while subjected to an external magnetic field. In this paper, a double-plate magneto-rheological fluid (MRF) clutch with controllable torque output have been designed. Electromagnetic finite element analysis is used to optimize the design of the clutch by using the commercial FEA software ANSYS.

The mmW Band Tamm States in One-Dimensional Magnetophotonic Crystals

2009 ◽  
Vol 152-153 ◽  
pp. 394-396 ◽  
Author(s):  
Sergey I. Tarapov ◽  
M. Khodzitskiy ◽  
S.V. Chernovtsev ◽  
D. Belosorov ◽  
A.M. Merzlikin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Theoretical Prediction ◽  
Experimental Results ◽  
One Dimensional ◽  
Magnetophotonic Crystals ◽  
Good Agreement

The mmW band photonic Tamm states in 1D magnetophotonic crystals are studied. It is shown the possibility to manipulate the eigenfrequencies of such states by an external magnetic field. Our experimental results are in a good agreement with theoretical prediction.

Development and Performance Test of a Micromachined Resonant Accelerometer

2004 ◽  
Vol 261-263 ◽  
pp. 1575-1580
Author(s):  
Tae Sam Kang ◽  
Sang Kyung Sung ◽  
Chul Hyun ◽  
Byeung Leul Lee ◽  
Jang Gyu Lee ◽  
...  
Keyword(s):  
Performance Test ◽  
Dynamic Range ◽  
Fabrication Process ◽  
Experimental Results ◽  
Experimental Result ◽  
Bias Stability ◽  
Bonding Area ◽  
And Performance ◽  
Resonant Accelerometer ◽  
Structural Layer

In this paper, presented are design, analysis, and experimental result of a tunable surface micromachined resonant accelerometer, ACRC-RXL. Also fabrication process of mechanical structure is illustrated. We used 40[μm] thick epitaxially grown polysilicon as structural layer and sealing area. With the exception of the CMP process, for smoothing the bonding area, the fabrication processes are simple as the conventional surface micromachining process. Experimental results show that the developed accelerometer has a performance of bias stability about 0.5mg and dynamic range over 10g.

Dynamic Characterization of Non-Homogeneous Magnetorheological Fluids Based Multi-Layer Beam

2011 ◽  
Vol 110-116 ◽  
pp. 105-112 ◽  
Author(s):  
Vasudevan Rajamohan ◽  
Manoharan Ramamoorthy
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Natural Frequencies ◽  
Mode Shapes ◽  
Mr Fluid ◽  
Various Boundary Conditions ◽  
Mr Fluids ◽  
Magneto Rheological ◽  
Loss Factors

The vibration properties of multi-layer beam structure comprising axially non-homogeneous magneto-rheological (MR) fluids layer are investigated. The governing equations of a non-homogeneous MR fluids multi-layered beam are formulated using finite element method and Ritz formulation. The validity of the proposed finite element formulations is demonstrated by comparing the results with those obtained from the Ritz formulation. The properties of different configurations of a non-homogeneous MR-fluid beam are evaluated to investigate the influences of the location of the different MR-fluids for various boundary conditions. The properties in terms of natural frequencies and loss factors corresponding to various modes are evaluated under different magnetic field intensities. The effect of location of the fluid treatment on deflection mode shapes is also investigated. The results suggest that the natural frequencies and loss factors of the non-homogeneous MR fluid beams are strongly influenced not only by the intensity of the applied magnetic field, but also by the location of the MR fluids. It is also concluded that the application of non-homogeneous MR fluids could also alter the deflection pattern of the beam, particularly the location of the peak deflection.

scholarly journals Initial Elastic Stiffness of Bolted Shear Connectors in Steel-Concrete Composite Structures

2022 ◽  
Vol 2022 ◽  
pp. 1-13
Author(s):  
Chenggong Wang ◽  
Diankai Cao ◽  
Xiaoyang Liu ◽  
Yucai Jing ◽  
Wenzhuo Liu ◽  
...  
Keyword(s):  
Composite Structures ◽  
Great Influence ◽  
Shear Stiffness ◽  
Elastic Stiffness ◽  
Experimental Results ◽  
Empirical Formulas ◽  
Element Analysis ◽  
Shear Connectors ◽  
Coupling Stiffness ◽  
Good Agreement

Bolted shear connectors have the advantages of being easily fitted and dismantled during construction, the initial elastic stiffness of which has a great influence on the structural performance of the connected composite structures. In this paper, the initial elastic behaviors of three types of bolted shear connectors used in steel-concrete composite structures (i.e., the bolt with nonembedded nut, the bolt with single-embedded nut, and the bolt with double-embedded nuts) are investigated using finite element analysis (FEA). After the FE models are verified against the experimental results in other literature, an extensive parametric study is carried out to investigate the effects of eight parameters of the composite structures on the initial shear stiffness and tension stiffness as well as coupling stiffness. Empirical formulas are subsequently developed for obtaining the initial elastic stiffness of the bolted shear connectors, based on which further FEA is performed. The FEA results are in good agreement with the experimental results, illustrating the effectiveness of the empirical formulas.

A Study on the Tribological Characteristics of a Magneto-Rheological Elastomer

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
Deuk-Won Lee ◽  
Kwanghee Lee ◽  
Chul-Hee Lee ◽  
Cheol-Hyun Kim ◽  
Won-Oh Cho
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Mechanical Engineering ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Tribological Performance ◽  
Tribological Characteristics ◽  
Mr Fluids ◽  
Pin On Disc ◽  
Magneto Rheological

Research on the applications of magneto-rheological (MR) elastomers in mechanical engineering has greatly expanded, whereas the performance of MR fluids in tribology has rarely been investigated. In this study, the tribological characteristics of an MR elastomer are identified in order to improve tribological performance with the activation of a magnetic field. Microscopic changes in the surface and in the MR particles are investigated. The friction and wear of an MR elastomer is measured using a pin-on-disc tester under applied and unapplied magnetic fields. In addition, the linear sliding friction of an MR elastomer with respect to different velocities and loads is measured using a linear sliding tester.

Development of Universal Robot Gripper Using MRα Fluid

2016 ◽  
Vol 13 (04) ◽  
pp. 1650017 ◽  
Author(s):  
Takeshi Nishida ◽  
Yuki Okatani ◽  
Kenjiro Tadakuma
Keyword(s):  
Magnetic Field ◽  
Specific Gravity ◽  
Experimental Results ◽  
Elastic Membrane ◽  
Mr Fluid ◽  
Mr Fluids ◽  
Robot Gripper ◽  
Nonmagnetic Particles

In this paper, we developed a universal robot gripper using an electromagnet and a novel reforming magnetorheological (MR) fluid. First, we added nonmagnetic particles to an MR fluid to develop a novel reforming MR fluid called MR[Formula: see text] fluid; this fluid resolved several issues faced with MR fluids. The developed fluid’s specific gravity is one-half and solidification hardness is two times that of MR fluid. The characteristics of the MR[Formula: see text] fluid and an application that can control solidification under a magnetic field are described. Next, the developed gripper, which consists of an electromagnet and an elastic membrane that encloses the MR[Formula: see text] fluid, is described. Further, several experimental results of the features and capabilities of the gripper are presented.

Precision Machining for Thin Wall Spherical Shell Based on Magneto-Rheological Fluids Strengthening

2011 ◽  
Vol 381 ◽  
pp. 6-10 ◽  
Author(s):  
Jin Xing Kong ◽  
Yong Cheng Zheng ◽  
Qi Long Wei
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Spherical Shell ◽  
Metal Powder ◽  
Precision Machining ◽  
Thin Wall ◽  
Mr Fluids ◽  
Cutting Experiment ◽  
Magneto Rheological ◽  
The Magnetic Field

Magnetorheological (MR) fluids can transform from fluid to solid and back to fluid rapidly in magnetic field. It is a novel intelligent phase transition material. In this study, MR fluids are filled inside a thin wall spherical shell as phase transition material to improve the workpiece stiffness. A fixture structure based on MR fluids for the thin wall spherical shell precision machining is designed. The fixture stiffness can be controlled and the MR fluids can be used many times. The MR fluid as strengthening material is developed and the amount of metal powder in MR fluids is 52% by volume and the performance of MR fluids is measured. Based on electromagnetic principle, a special magnetic field is designed and the magnetic field distributing is analyzed and optimized. The thin wall spherical shell using the designed fixture is turned in CK7820B lathe. The cutting experiment result shows that the fixture based on MR fluids can improve the workpiece machining precision.

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.

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