PROPOSAL OF GENERATION-TYPE TMD WITH ELECTROMAGNETIC DAMPING DEVICE AND ITS APPLICATION TO AN ACTUAL BRIDGE UNDER SERVICE

Abstract

 In this study, a power generation-type Tuned Mass Damper (TMD) with an electromagnetic damping device that enables power generation and easier damping adjustment is proposed as an alternative to the conventional TMD with oil dampers installed on expressway bridges in service. A road traffic vibration test on an actual bridge in service was carried out to verify its damping effect and effect on reducing low-frequency noise. Numerical simulations were carried out to show that by changing the electric resistance of the electromagnetic damping device, various types of power-generating TMDs can be designed, which focus on vibration control, energy absorption or power generation. In the experiment, using an actual bridge, the damping effect of the power generation-type TMD was confirmed to, on the whole, agree with the numerical simulation and the electric resistance design was proven to be useful. The results indicates that it is possible to use the power generation-type TMD, with the same level of damping effect as that of the oil damper, on an actual bridge.