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Frontiers of Mechanical Engineering

Front Mech Eng    2013, Vol. 8 Issue (3) : 261-267
Vibration control of a structure using Magneto-Rheological grease damper
Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama, Japan
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This paper describes an application study of Magneto-Rheological (MR) grease damper to a structure with three stories. MR fluid is known as one of successful smart materials whose rheological properties can be varied by magnetic field strength, and has been applied to various kinds of device such as dampers, clutches, engine mounts, etc. However, ferromagnetic particles dispersed in MR fluid settle out of the suspension after a certain interval due to the density difference between the particles and their career fluid. To overcome this defect, we have developed a new type of controllable working fluid using grease as the career of magnetic particles. Network of thickener in grease is expected to hold the magnetic particles and prevent them from settled down. No or little sedimentation was observed in MR grease whose characteristics could be controlled by the magnetic field strength. MR grease was introduced into a cylindrical damper and its performance was studied. As a result, it was confirmed that the damping force of MR grease damper could be controlled by the applied electric current to the coil in the cylinder of damper. Furthermore, vibration response of a three-story model structure equipped with MR grease damper was investigated experimentally, and it was shown that MR grease damper worked effectively as a semi-active damper.

Keywords vibration control      damper      smart material      Magneto-Rheological (MR) grease      MR fluid     
Corresponding Author(s): MORISHITA Shin,   
Issue Date: 05 September 2013
 Cite this article:   
Shinya SUGIYAMA,Tomoki SAKURAI,Shin MORISHITA. Vibration control of a structure using Magneto-Rheological grease damper[J]. Front Mech Eng, 2013, 8(3): 261-267.
Fig.1  Photo by electron microscope
Fig.2  Photo by phase contrast microscope
Fig.3  Photographs of MR fluid and MR grease left still for a long time. (a) MR fluid; (b) MR grease
Fig.4  Schematic view of rotational viscometer
Base oilParticlesConcentrationof particlesThickenerConcentrationof thickenerPenetration
Mineral oilCarbonyl iron75 wt%Lithium soap1 wt%320
Tab.1  Specification of test samples
Fig.5  Shear stress-shear rate relationship
Fig.6  Shear stress-magnetic flux density relationship
Fig.7  MR grease damper
Fig.8  Schematic view of MR grease damper
Stroke24 mm
Inner diameter of cylinder10 mm
Outer diameter of piston8.2 mm
Piston length10 mm
Diameter of piston rod3 mm
The number of windings of coil72 turns
Tab.2  Specification of MR grease damper
Fig.9  Hysteresis loop of MR grease damper at 2.0 mm. (a) 0.1 Hz; (b) 1.0 Hz; (c) 3.0 Hz
Fig.10  Schematic view of experimental setup
Fig.11  Time history at 4.1 Hz. (a) Displacement of the top floor; (b)
Fig.12  Time history at 5.0 Hz. (a) Displacement of the top floor; (b) current value to the damper
Fig.13  Frequency response
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