Structural vibration control with active mass damper by utilizing centrifugal force

Abstract

Due to the frequent earthquakes, Japan has suffered tremendous damage, so studies on equipment to control building vibration have been actively conducted. One of them is using active mass damper (for short, AMD). This device comprises a movable mass, an actuator for driving the mass, an acceleration sensor and a computer. Based on the signal of the vibration obtained from the acceleration sensor, computer calculates the command value so that the AMD can reduce vibration. Feeding back the value, the mass is driven by the actuator, and damping is performed by the generated reaction force. AMD stroke is proportional to the amplitude of the vibration. Therefore, there is a problem that AMD stroke exceeds the range of AMD when it controls vibration of large amplitude. we propose AMD which does not need to consider the range of motion by utilizing centrifugal force. Unnecessary force components are canceled by rotating the two eccentric weights in mutually opposite directions, and a force component in only one direction can be obtained. Therefore, it can solve the problem of conventional AMD. In this paper, it shows the overall control system of proposed AMD. In the simulation performed using the proposed method, we can reduce building acceleration by 37.0 % in RMS.