Abstract：In order to study the effect of subsystem parameters on the natural characteristics of double-layer vibration isolation system（DLVIS）, a 3 DOF dynamic model was established, and the analytic expression of dynamic magnification factors and dimensionless natural frequency of the system were deduced ，then the expressions between the decoupling degree and vibration modal of the isolation system and the mass ratio and stiffness ratio of subsystem were obtained. Afterwards, the law of DLVIS main system natural characteristics affected by mass ratio and stiffness ratio of subsystem was studied. On this basis, the influence law of natural characteristics of 12-degree main system affected by the air cooling subsystem’s mass and stiffness for DMU powerpack DLVIS with multiple subsystems were simulated. The results have guiding significance for design of subsystem of double-layer vibration isolation system.
2015, Vol. 34 
