Abstract
This paper proposes a dynamic vibration absorber with a differential pulley for a shorter elongation of spring. The spring of this dynamic vibration absorber is connected to the inner radius of differential pulley and a rope is wound around the outer radius of it. This mechanism makes the elongation of spring shorter than the stroke of absorber mass. By using this mechanism we can make a compact dynamic vibration absorber, and it is easy to install it to the real system. This dynamic vibration absorber was applied to a pendulum, which was a simple model of a ropeway carrier, and experiments were conducted to validate theoretical results. The optimal damping coefficient and frequency ratio of the dynamic vibration absorber for free vibration were derived analytically and these values were used to computer simulation and experiment. Their agreement of both of them was good in general. Furthermore, power spectrum of wind velocity proposed by Davenport was used to simulate the time history of natural wind velocity and the effect of this new device was evaluated experimentally.
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