A research and development of smart building structures by Magneto-Rheological damper

Fujitani, Hideo; Shiozaki, Yoichi; Hiwatashi, Takeshi; Hata, Kenji; Tomura, Takuya; Sodeyama, Hiroshi; Soda, Satsuya

doi:10.1016/b978-008044100-9/50061-9

Cited by 4 publications

(4 citation statements)

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“…The controlled accelerations are reduced to the same values as those of the case of the constant electric current of 0.3 A, and the controlled displacements are reduced to the same values as those of the case of the constant current of 0.6 A. This shows that semi-active control by the MR damper reduces the response displacements while reducing the response acceleration (Fujitani 2002b).…”

Section: Performance Verification By Large-scale Shaking Table Testsmentioning

confidence: 58%

“…23(a)) was developed in order to verify the performance of an MR damper, for example, the force-displacement relationship, the force-velocity relationship, the influence of temperature and response speed of an MR damper (Sunakoda 2000). Then a 200 kN MR damper was developed in order to verify the same items in the case that the electromagnet was attached to the bypass flow portion which was connected to the cylinder (Fujitani 2002a).…”

Section: Researches and Development Of Mr Fluids And Mr Dampersmentioning

confidence: 99%

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Research and Development on Smart Structural Systems in U.S.-JAPAN Cooperative Structural Testing Program

et al. 2004

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The Building Research Institute (BRI) launched a 5-year research and development project on Smart Materials and Structural Systems in 1998 as part of U.S.-Japan cooperative research efforts. Smart Structural Systems also called as Auto-adaptive Media are defined as systems that can automatically adjust structural characteristics, in response to the change by external disturbances and environments, toward structural safety and serviceability as well as the elongation of structural service life. Smart materials and systems have been developed and studied.

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Section: Performance Verification By Large-scale Shaking Table Testsmentioning

confidence: 58%

Section: Researches and Development Of Mr Fluids And Mr Dampersmentioning

confidence: 99%

Research and Development on Smart Structural Systems in U.S.-JAPAN Cooperative Structural Testing Program

et al. 2004

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“…Later, people began large-scale research on magnetorheological shock absorbers for automotive suspensions. In terms of improving damping force performance, Sanwa Tekki Company of Japan has developed a bypass valve-type magnetorheological damper that can output up to 20 tons of damping force [6][7].Shawn. P. Kelso and others from the United States [8] invented a magnetorheological damper with an S-shaped irregular damping gap to improve damping performance.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental study of a stepped magnetorheological damper with power generation

Yang

Chen

Geng

et al. 2023

Preprint

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Traditional vehicle suspension magnetorheological dampers have problems with low output damping force and require additional energy input to operate, to improve the performance of the vehicle suspension magnetorheological damper, in this paper we propose and investigate a stepped magnetorheological damper structure with power generation, and conducts structural design and magnetic circuit analysis. The effects of different currents, damping gaps, coil slot positions, and coil turns on the damping performance of the stepped magnetorheological damper with power generation are numerically studied. The magnetic circuit sensitivity analysis of the power generation structure and the magnetorheological damper structure is also performed. Experiments have verified the effects of different input excitations on damping and energy-feeding performance, and the results of numerical analysis have been verified. The results show that when the excitation coil is wound for 257 turns, the magnetic circuit requirements are met, and the maximum damping force of the proposed electromagnetic energy fed stepped magnetorheological damper can reach over 4500N, meeting the use requirements.

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“…It has also been widely used for the clutch, brake and locking systems in the automotive sector (Li and Du 2005;Park et al 2006;Senkal and Gürocak 2010;19-21). Similarly, the MR fluids have been used in different areas of industry, structural control applications; for the protection of buildings against earthquake while absorbing vibrations of bridges and buildings during the earthquakes and also absorbing vibrations of washing machines Dyke et al 1996;Dyke et al 1997;Gordaninejad et al 1999;Fujitani et al 2002;Yang et al 2011), to medical area; for the use of prosthetic legs to facilitate the movement (Hsu et al 2006;Jonsdottir et al 2009;Hreinsson 2011) and surface polishing technology (Yan et al 2007;Jha and Jain 2009;Jang et al 2010). Also it will be possible to make robots that can be able to use hands and arms as naturally as people by using MR fluids planned to be used in spacecrafts (Pettersson et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Laminar Pipe Flow of Magneto-Rheological Fluids under Applied External Magnetic Field

Gedik

2017

JAFM

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An experimental and numerical study of Magnetorheological (MR) fluids flow in circular pipes under the influence of uniform magnetic field is considered. In the experiments, an electromagnetic device was manufactured to generate the magnetic field. The experiments were performed using magnetic fields B= 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.12 and 0.15 T. Numerical study was performed to show the accuracy of the results obtained from experimental study. In numerical study, Computational Fluid Dynamics (CFD) analysis was used. The ANSYS Fluent 14.0 code based on the finite volume method was used for the CFD analysis. In the experiments, the applied magnetic field decreased the flow rate of the fluids by increasing viscosity. In case of 10 mm pipe diameter, the flow velocity of the A, B and C fluids were obtained as 0.593, 0.749 and 0.938 m/s respectively in situation B=0 T. When magnetic field was applied as B=0.15 T, decreases have occurred in the velocity of A, B and C fluids as 95.27%, 90.24% and 85.6% respectively. Similarly, in case of 15 mm pipe diameter, 96.87%, 95.06% and 90.76% decreases have occurred in the flow velocity of A, B and C fluids having 0.301, 0.363 and 0.445 m/s flow velocity respectively. The results were compared for the magnetic field values B=0, 0.05, 0.10 and 0.15 T. It was found that the differences between experimental and numerical study were found as 6.10% and 1.71% for the B=0 T and B≠0 T situations respectively when the pipe has 10 mm pipe diameter. In case of 15 mm pipe diameter, the differences were found as 2.31% and 0.89%. As a result, it was found that the results obtained from experimental and numerical study were qualitatively and quantitatively in good agreement.

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A research and development of smart building structures by Magneto-Rheological damper

Cited by 4 publications

References 0 publications

Research and Development on Smart Structural Systems in U.S.-JAPAN Cooperative Structural Testing Program

Research and Development on Smart Structural Systems in U.S.-JAPAN Cooperative Structural Testing Program

Design and experimental study of a stepped magnetorheological damper with power generation

Experimental and Numerical Investigation on Laminar Pipe Flow of Magneto-Rheological Fluids under Applied External Magnetic Field

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