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- W2756513420 abstract "In recent years, to prevent art objects from falling by earthquake, various seismic isolators are developed. Many seismic isolators only have efficiency for horizontal direction because objects are almost fallen down by horizontal vibration. However, development of seismic isolator corresponded to vertical vibration is required, since great earthquake of vertical vibration like Niigata Prefecture Chuetsu Earthquake in 2004 occurred. As previous study of the vertical seismic isolator, we developed seismic isolator using negative stiffness mechanism to reduce natural frequency. However, to receive the weight by vertical spring, the static deflection of spring becomes bigger when natural frequency is reduced. Additionally, the height of seismic isolator increases when negative stiffness is used to reduce static deflection. In fact, it is difficult to balance reducing natural frequency and downsizing of seismic isolator. In this study, using of the fact that arbitrary design of spring characteristic from positive to negative can be achieved by link-crank mechanism, we developed vertical seismic isolator which can support load in using horizontal spring without using vertical spring. By this, we achieved vertical seismic isolator which has major stroke, lower installation height. We verified performance of this vertical seismic isolator by conducting shaking tests and math calculation." @default.
- W2756513420 created "2017-10-06" @default.
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- W2756513420 date "2013-05-23" @default.
- W2756513420 modified "2023-09-25" @default.
- W2756513420 title "The Vertical Seismic Isolator by using a link-crank mechanism" @default.
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