所属 明治大学 理工学部 職種 専任教授
|標題||Fluid inertia damper using MR fluid with a long spiral bypass pipe|
|掲載誌名||Mechanical Engineering Journal|
|著者・共著者||Taichi MATSUOKA, Kazuhiko HIRAMOTO, Katsuaki SUNAKODA, Naoto ABE and Pei-Yang LIN|
|概要||An inertia damper with a long spiral bypass pipe was developed in order to obtain a series inertia effects for
vibration suppression of structures in practical use. The damper comprised a cylinder, piston, and MR fluid.
The gap was spirally formed around the outside of a cylinder, and acted as a long bypass pipe. MR fluid is well
known for its changeable damping effect, but the mass of the fluid is the focus of this study. It is obvious from
previous studies that a fluid inertia effect is caused by quick motion in the long bypass pipe, and it depends on
the length of the bypass pipe, compression ratio of area, and density. A large inertia effect can be derived if the
fluid has a heavy mass. In order to confirm the inertia effect, a prototype damper was manufactured, and
resisting force characteristics were measured. Seismic response tests using a 3-story structure were then
performed using a shaking table with the damper installed. Each story of the structure had a height of 3 m, and
a weight of 6 tons with a total height of 9 m and a total weight of 18 tons. Several types of earthquakes were
input, and the response acceleration, relative displacement, and reaction force were measured. Finally the
effects of vibration reduction were confirmed experimentally, and a feasibility study was discussed.