Abstract
The authors propose a new type of semiactive damper to control a seismic response of a piping system. The damper is composed of a ball screw and a disk brake with piezoelectric actuators. The brake force is controlled corresponding to the seismic response of the piping or an input acceleration. The damper does not restrict the thermal expansion of the piping because its brake force does not work during a gradual movement. The seismic responses of an L-shaped piping supported with the semiactive damper are calculated using a continuous system simulation language. The restraint effects of the damper are also confirmed experimentally. The results may be summarized as follows : (1) The relative displacement response of the piping can be reduced successfully by the semiactive damper. (2) The semiactive damper has the effect of vibration suppression even by simple control methods such as on-off control and proportional control. (3) The resistance force of the semiactive damper is small compared to that of a mechanical snubber.
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