Semi-active vibration isolation system with stiffness on-off control

摘要

In a vibration system,the spring stores the kinetic energy as potential energy.The potential energy is proportional to the spring constant.Then it is not reasonable to consider that the spring stiffness can be changed instantaneously because of the energy conservation law.In this paper,a Voigt element(a controllable damper and a constant spring arranged in parallel)and a spring in series are used to change the system stiffness.The potential energy is stored by the series spring in the damper on-state.When the damper is switched to the off-state,the potential energy has a loss because of the damper dissipation.The proposed system is experimentally implemented using a magnetorheological fluid damper.The calculation and experimental results showed that the system with stiffness on-off control provides excellent vibration isolation for a broad range of excitations.