Abstract
We report an active seismic response control system by utilizing an energy conversion in damping devices. In this paper, we propose a system based on hydraulic technology which can control large forces and energies easily. The device model, i.e. the dynamic characteristic of this system is constructed, and its energy characteristics are parametricaly analyzed through 5 cases of natural periods, 1s, 2s, 3s, 4s, 5s. The results noted in this study are as followings: (1)the Numerical modelling of an oil pressure system based on the balance of pressures and flow rates is constructed, and the system specifications are established through the seismic response analyses where the damping force and the controlling force are restricted. (2)The system using a device model by the hydraulic technology shows the similar response reduction effect to an ideal model. (3)The energy conversion ratio using the device model in the oil damper is more than 95 %, and that in the actuator is about 90 %. (4)The balance of energy input and output between energy conversions and reuses in the hydraulic analyses shows favorable effect for the earthquake causing large responses; on the other hand, that is aggravated in accordance with the increases of the control gains. The case where the energy balance is more than 1.0 is only for the building model of natural period 3s excited by El Centro. (5)The energy balance by the hydraulic analysis is remarkably small compared to the ideal model, since the actual rate of the actuator’s work is small compared to the output energy to an actuator. (6)By applying the technique switching the active actuation to the passive damping after a principal motion, the energy balance can be formed in the earthquake causing the maximum response and the maximum response value can be restricted equivalent to the active seismic response control, except for the building model of natural period 2s We have evaluated the characteristics of the proposed system based on the numerical analyses considering the dynamic characteristics of the realized system based on the hydraulic technology, and indicated feasibility of the energy balance formation.
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