Vibration control of a structure using Magneto-Rheological grease damper

doi:10.1007/s11465-013-0268-4

Front Mech Eng

2013, Vol. 8

Issue (3) : 261-267 https://doi.org/10.1007/s11465-013-0268-4

RESEARCH ARTICLE

Vibration control of a structure using Magneto-Rheological grease damper

Shinya SUGIYAMA, Tomoki SAKURAI, Shin MORISHITA(

)

Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama, Japan

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Abstract

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,Email:mshin@ynu.ac.jp

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.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-013-0268-4
https://academic.hep.com.cn/fme/EN/Y2013/V8/I3/261

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

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

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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