抄録
Various vibrations adversely affect human body or structures. Therefore, vibration measures have been investigated by many researchers for many years. Especially, a seismic isolation is attracting attention owing to recent huge earthquake. Among devices of the isolation system used in large structures such as buildings, a friction damper that generates a large damping force is simple. ln mechanism and. It is easy to maintain. However, the ordinary friction damper of constant frictional force has performance limitation, because the isolation characteristic declines when the friction force is large, while resonant peak becomes large when the friction force is small Furthermore, the displacement remains apart from the equilibrium position after the disturbance disappeared. It is known that these problems are avoided when the friction force varies depending on the relative displacement Recently, Yamaguchi et al proposed the damper that the friction force varies in proportion to relative displacement by combining the tilt lever supported with pivot and the cylindrical block. In this paper, we propose more simple mechanism consisted of the tilt lever supported with the leaf spring and the cylindrical block When the cylindrical block moves and pushes the tilt lever, the normal and friction forces at the contact surface vary according to the displacement of the cylindrical block.
