Performance of accelerated oscillator dampers under seismic loading

Structure control techniques have been used to control vibrations in civil structures from natural and other types of hazards for many years. However, it is difficult to achieve effective reduction in the dynamic responses of the structures under seismic excitation for the reason that earthquake generates huge kinetic energy in short time interval, unless adopting very large conventional vibration reduction devices to absorb so much energy. A kind of mass damper, the accelerated oscillator damper is proposed in this article to improve the performance of vibration absorbers. The kinetic energy of the secondary mass is proportional to the square of its velocity, and speed of the secondary mass can be amplified through the transmission of the accelerated oscillator damper system, so that according to the principle of energy conservation, the more kinetic energy the secondary mass gets from the whole system, the more kinetic energy the building will lose. The proposed accelerated oscillator damper system is superior to the tuned mass damper system for short input durations and the maximum seismic response. Moreover, the investigation also shows that the transmission ratio plays a more significant role for vibration absorption than the mass ratio