板ばねで支持された傾斜レバーと円柱ブロックで構成された比例摩擦ダンパに関する研究

抄録

For passive vibration isolation systems, a friction damper has an advantage that large damping is achieved using a simple mechanism and it is easy to maintain. However, the ordinary friction damper of constant frictional force has performance limitations, 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 has disappeared. It is known that these problems are avoided when the friction force varies depending on the relative displacement. Recently, authors proposed a damper where the friction force varies in proportion to the relative displacement by combining a cylindrical block and a tilt lever supported with a pivot. In this paper, we propose much more simple mechanism that consists of a cylindrical block and a tilt lever supported with a leaf spring instead of a pivot. 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. The expected characteristic is verified by the numerical simulation and the experimental results. The numerical simulation also investigates the effects of the geometrical parameters as the design guideline.