Affiliations: Department of Mechanical Engineering, Keio University, Hiyoshi, Yokohama, Japan
Correspondence:
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Corresponding author: Tatsuo Sawada, Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan. E-mail:sawada@mech.keio.ac.jp
Abstract: This study reports on the effects of tapered metering
pins on the behavior of magnetorheological (MR) fluid with a magnetic field
applied around an orifice under an impact load. We proposed a mechanical
model of the MR fluid pipe flow and compared it with the experiment results
of the flow under an impact load. We also conducted drop impact tests with
four types of tapered metering pins and carried out qualitative analysis of
the effects of the pins. The experimental results were analyzed by
displacement, velocity and acceleration of the dropping piston. The results
show that the shape of the pins has some effect on the entire shock
absorption process, whereas magnetic field strength affects the post-peak
behavior only, and shock absorption with a longer tapered pin is more widely
controllable by a magnetic field. These results indicate that a tapered
metering pin has applicability to shock absorption using an MR fluid.
