Seismic wave control is very important both in civil and mechanical engineering. Common passive methods for isolating a building or a device include Base Isolators (BI) and Tuned Mass Dampers (TMD). In the present paper, a time varying controllable spring is considered as a vibration isolator for a linear mechanical system. The controller works as follows: when the seismic movement is active, the velocity of the moving mass is monitored as the reference velocity. When such reference velocity is positive, the stiffness is reduced; when it is negative, the stiffness is increased. Numerical investigations show that the controller is capable to filter seismic excitation close to the natural frequency of the controlled system, and to reduce the total seismic energy transfer up to 5 times. The role played by the gravity in the active vibration filtering is pointed out by showing that no filtering action can be observed in gravity-free simulations. Even though the controlled system is linear, the controller presents a non-smooth fluctuation of the stiffness, so that a limit cycle occur within the system.

Active vibration control of seismic excitation / Barbieri, Marco; Cinque, Fabio; Ilanko, Sinniah; Pellicano, Francesco. - (2013). ((Intervento presentato al convegno 4th International Conference on Nonlinear Dynamics ND-KhPI2013 tenutosi a Sevastopol, Ukraine nel 2013.

Active vibration control of seismic excitation

BARBIERI, MARCO;PELLICANO, Francesco
2013-01-01

Abstract

Seismic wave control is very important both in civil and mechanical engineering. Common passive methods for isolating a building or a device include Base Isolators (BI) and Tuned Mass Dampers (TMD). In the present paper, a time varying controllable spring is considered as a vibration isolator for a linear mechanical system. The controller works as follows: when the seismic movement is active, the velocity of the moving mass is monitored as the reference velocity. When such reference velocity is positive, the stiffness is reduced; when it is negative, the stiffness is increased. Numerical investigations show that the controller is capable to filter seismic excitation close to the natural frequency of the controlled system, and to reduce the total seismic energy transfer up to 5 times. The role played by the gravity in the active vibration filtering is pointed out by showing that no filtering action can be observed in gravity-free simulations. Even though the controlled system is linear, the controller presents a non-smooth fluctuation of the stiffness, so that a limit cycle occur within the system.
4th International Conference on Nonlinear Dynamics ND-KhPI2013
Sevastopol, Ukraine
2013
Barbieri, Marco; Cinque, Fabio; Ilanko, Sinniah; Pellicano, Francesco
Active vibration control of seismic excitation / Barbieri, Marco; Cinque, Fabio; Ilanko, Sinniah; Pellicano, Francesco. - (2013). ((Intervento presentato al convegno 4th International Conference on Nonlinear Dynamics ND-KhPI2013 tenutosi a Sevastopol, Ukraine nel 2013.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1119438
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