2014 年 80 巻 815 号 p. DR0206
For the passive vibration isolation system, a friction damper is advantageous at cost, a maintenance, etc. However, the conventional damper of constant friction force has performance limitations; the isolation characteristic declines when the friction force is large, while the resonant peak becomes large when the friction force is small. Furthermore, the displacement remains apart from the equilibrium position after the vibration diminishes. In order to overcome above drawbacks, this paper proposes a vibration isolation system equipped with a new linear friction damper where the magnitude of the frictional force increases proportionally to the relative displacement. This proportionality is achieved by combining a cylindrical block and a tilt lever supported with a leaf spring. When the cylindrical block moves and pushes the tilt lever, the normal force exerted by the leaf spring at the contact position increases. Thus, the friction force varies in proportion to the relative displacement between the tilt lever and the cylindrical block. The transient response and the displacement transmissibility are investigated by numerical simulation and experiments, confirming the effectiveness of the linear friction damper.
