CONTROLLING METHOD FOR ACTIVE MASS DAMPER

PURPOSE:To restrain control force of an active mass damper (AMD) in wind response vibration control by a method wherein a point of inflection is developed on a resonance curve made by the stroke and the control force of the AMD, and the frequency at the peak of wind force spectrum is made to agree with the frequency at the point of inflection. CONSTITUTION:A control device 30 and a vibration sensor 24 are provided to a model of two systems of particles made by adding an active mass damper 12 to a main vibration system 10. The main vibration system 10 in a mass (m) is supported horizontally with two leaf springs 14 and 14 in a spring constant K/2. The main vibration system 10 vibrates approximately in the horizontal direction by working of external force. The active mass damper 12 is constructed of members including an additional mass 16 in a mass (md) that is capable of moving along the vibration direction of the main vibration system 10, a spring 18 in a spring constant Kd, a dash pot 20 that gives damping coefficient Cd and an actuator 22. The actuator 22 is given control force u(t) from the control device 30 and gives it to the additional mass 16, and thereby inertia force is given as a vibration control force to the main vibration system 10. Then the output from the vibration sensor 24 provided to the main vibration system 10 is inputted into the control device 30.