Abstract
For the passive isolation systems, the ordinary friction damper of constant friction force has performance limitations, because the isolation characteristic declines and the displacement remains apart from the equilibrium position after the disturbance disappears when the friction force is large. In order to overcome the above drawbacks of the ordinary friction damper, a new type of friction damper is proposed in our previous paper. This is achieved by use of an inclined lever, which contacts the cylindrical block by means of a rotational spring, causing the normal and frictional forces at the contact surface to vary according to the displacement of the cylindrical block. However, sprag-slip vibration occurred in the experiments. This paper investigates the cause of the vibration and the design to prevent it. For this purpose, dominant vibration is investigated by the experimental modal analysis. Then, the analytical model is proposed to simulate the problem and estimate the effect of improvement. The model takes into account deformation of the lever, contact surface and pivot support. Results of the numerical simulation showed vibration characteristics similar to the experimental result.
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