Seismic response reduction of a three-story building by an MR grease damper
Tomoki SAKURAI1, Shin MORISHITA2()
1. Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan 2. Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan
This paper describes an application of magneto-rheological (MR) grease dampers as seismic dampers for a three-story steel structure. MR fluid is widely known as a smart material with rheological properties that can be varied by magnetic field strength. This material has been applied to various types of devices, such as dampers, clutches, and engine mounts. However, the ferromagnetic particles dispersed in MR fluid settle out of the suspension after a certain interval because of the density difference between the particles and their carrier fluid. To overcome this defect, we developed a new type of controllable working fluid using grease as the carrier of magnetic particles. MR grease was introduced into a cylindrical damper, and the seismic performance of the damper was subsequently studied via numerical analysis. The analysis results of the MR grease damper were compared with those of other seismic dampers. We confirmed that the MR grease damper is an effective seismic damper.
Takahashi O. Development and construction of three-dimensional seismic isolation building. In: Proceedings of 13th Japan Earthquake Engineering Symposium. 2010, 442–449 (in Japanese)
2
Kato R, Fujita S, Minagawa K, et al.Vibration damping of thermal power plant boiler due to earthquake by using viscous-friction hybrid dampers. In: Proceedings of Japan Society of Mechanical Engineers, Dynamics and Design Conference. 2015, 310 (in Japanese)
3
Yamano S, Matsuoka T, Hiramoto K, et al.Fluid inertia damper using MR fluid that has a long spiral by-pass pipe. In: Proceedings of Japan Society of Mechanical Engineers, Dynamics and Design Conference. 2015, 339 (in Japanese)
4
Komatsuzaki T, Iwata Y. Design of a real-time adaptively tuned dynamic vibration absorber with a variable stiffness property using magnetorheological elastomer. Shock and Vibration, 2015, 2015(568): 1–11
5
Rabinow J.The magnetic fluid clutch. Transactions of American Institute of Electrical Engineers, 1948, 67(2): 1308–1315 https://doi.org/10.1109/EE.1948.6444497
6
Carlson J D, Catanzarite D M, St. Clair K A. Commercial magneto-rheological fluid devices. International Journal of Modern Physics B, 1996, 10(23n24): 2857–2865 https://doi.org/10.1142/S0217979296001306
7
Ahn Y K, Ahmadian M,Morishita S.On the design and development of a magneto-rheological mount. Vehicle System Dynamics, 1999, 32(2–3): 199–216
8
Sodeyama H, Suzuki K, Iwata N, et al.A study on design method of the bypass type MR damper. Transactions of the Japan Society of Mechanical Engineers, Series A, 2004, 70(691): 625–632 (in Japanese) https://doi.org/10.1299/kikaic.70.625
9
Ahn Y K, Ha J H, Kim Y H, et al.Dynamic properties of a squeeze-type mount using magnetorheological fluid. Proceedings of the Institution of Mechanical Engineers, Part K. Journal of Multi-Body Dynamics, 2005, 219(1): 27–34
10
Lee C H, Lee D W, Choi J Y, et al.Tribological characteristics modification of magnetorheological fluid. Journal of Tribology, 2011, 133(3): 031801
11
Shiraishi T, Miida Y, Sugiyama S, et al.Typical characteristics of magnetorheological grease and its application to a controllable damper. Transactions of the Japan Society of Mechanical Engineers, Series A, 2011, 77(778): 2193–2200 (in Japanese) https://doi.org/10.1299/kikaic.77.2193
12
Jiang Z,Christenson R E.A fully dynamic magneto-rheological fluid damper model. Smart Materials and Structures, 2012, 21(6): 65002–65013 https://doi.org/10.1088/0964-1726/21/6/065002
13
Cha Y J, Agrawal A K,Dyke S J.Time delay effects on large-scale MR damper based semi-active control strategies. Smart Materials and Structures, 2013, 22(1): 015011 https://doi.org/10.1088/0964-1726/22/1/015011
14
Nagano Y,Nakagawa T, Suzuki K. A basic study for an elevator emergency stop device utilizing M.R. Fluid. In: Proceedings of the 15th International Conference on Electrical Machines and Systems. 2012, 1–4
15
Rahman M, Mahbubur Rashid M, Muthalif A G A, et al.Evaluation of different control policies of semi-active MR fluid damper of a quarter-car model, applied. Mechanics of Materials, 2012, 165: 310–315 https://doi.org/10.4028/www.scientific.net/AMM.165.310
16
Sugiyama S, Sakurai T, Morishita S. Vibration control of a structure using magneto-rheological grease damper. Frontiers of Mechanical Engineering, 2013, 8(3): 261–267 https://doi.org/10.1007/s11465-013-0268-4
17
Japan Society of Tribologist. Basic Knowledge of Grease and its Applications. Yokendo, 2007 (in Japanese)
18
Ohya Y, Miyamoto S, Morishita S, et al.Experimental study on visualization of grease flow. Journal of Japanese Society of Tribologists, 2011, 56(4): 248–255
