Abstract
By controlling spring stiffness, vibration reduction and isolation of a multi-degree-of-freedom mass-spring system are achieved in this study. The control algorithm of the spring stiffness is based on the variable structure systems (VSS) theory, The stiffness-controllable spring is achieved by using two straight bars that are hinged to the mass along a line perpendiculal to the direction of mass motion and an axial force is applied to these bars. Since the axial force causes a restoring force which is equivalent to that of the spring. the stiffness is controlled by the axial force. In numerical simulations and experiments, the settling time of the impulse response and the displacement transmissiblility are investigated. The results show that the proposed method is effective in suppressing shock motion and in isolating vibration transmitted from the floor.
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