Abstract
A variable damping isolator based on a translating cam designed especially is proposed in this paper. The nonlinear variable damping isolator is mainly comprised of translating cam with a pair of rollers arranged symmetrically and horizontally and two linear dampers. The damping force of this isolator increases with the increase of its vertical displacement. The dynamic equation is established when the variable damping isolator is applied to the active isolation system under simple harmonic excitation. And the dynamic response of the equation is obtained by Harmonic Balance Method. After that, the numerical simulations are conducted to discuss the effects of the parameters of the isolation system on force transmissibility. The results show that the effects on attenuating the resonance and the force transmissibility in the region of high-frequency ratio are superior to that of the corresponding linear damping vibration isolator when appropriate design parameters (cam profile and damping coefficient of the horizontal linear damper) of the variable damping isolator are selected.
Highlights
Vibration isolators have been widely used in engineering fields. e main indexes affecting the isolation performance of the isolators are natural frequency and damping ratio
In the low-frequency ratio range, increasing the damping ratio of the linear damping isolator can greatly reduce the resonance of the system
When the excitation is random or the natural frequency of the system changes, a satisfactory isolation performance cannot be achieved by the linear isolator. erefore, nonlinear damping isolators have attracted the attention of many scholars because of their variable damping coefficients
Summary
Vibration isolators have been widely used in engineering fields. e main indexes affecting the isolation performance of the isolators are natural frequency and damping ratio. Jin et al [23] analyzed the vehicle dynamic performance of high-speed trains with different wheel-rail contact states using variable stiffness and damping semiactive suspension magnetorheological yaw dampers. When the main system vibrates, the nonlinear variable damping isolator can provide a damping force, which varies with the change of its displacement, so that it can avoid infinitely large amplitudes at resonance and decrease the force transmissibility in the high-frequency region. En static force analysis of the cam is conducted, and the dynamic equation of the proposed variable damping isolator is developed and solved by the harmonic equilibrium method. Afterward, their dynamic response under harmonic excitation is investigated. The force transmissibility of the variable damping isolator is given
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