Modeling and numerical analysis on direct driving active mass driver control system for structural vibrations

Owing to the limitations of low energy efficiencies in traditional servo-valve based hydraulic driving Active Mass Driver (AMD) control system, a non-valve based actuation control system, direct driving active mass driver (abbreviated as DAMD) control system has been put forward. The principles and control strategies of Direct Drive Volume Control based electro-hydraulic servo system has been analyzed and proposed for structural vibration control. Based on the theory of electro mechanics and fluid dynamics, theoretical models relating the rotational velocities with forces of the DAMD system are developed which utilize the values of rotational velocity (or the voltage command of the motor amplifier) to predict active control force by the DAMD system. The equations of state for DAMD control system embedded into the objective structure are established also. At last, a two-storey shearing type structural model with DAMD control system installed on the top floor is utilized to study the response of the model subject to seismic excitations. The numerical results indicate that the DAMD control system can be fully replaceable of traditional AMD system to satisfy the requirement of force actuation for active vibration control of structures, which can suppress the seismic response of the structure effectively and realize structural active control to a certain extent.