Abstract
A new type of multi-tuned mass damper, which is designed to function well during both weak earthquake/wind and destructive earthquakes, has been investigated. This system uses impact forces from the primary mass and the added mass to reduce the displacement of the primary mass. From the results, it is confirmed that the performance of vibration control is about the same as that of optimally tuned mass dampers, although the displacement of the primary mass is markedly reduced to about half that generated by the TMD. In the practical design of vibration attenuation systems such as TMD or AMD, the stroke of the damper is one of essential problems to be considered to satisfy the seismic requirements for destructive earthquakes. This paper presents one of the break-through-techniques for such problem. In addition, using an actuator to control the added mass, it is confirmed that a smaller capacity of the actuator is required to obtain the same performance as that of the optimally controlled AMD.
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