Study on Vibration Transimibility Characteristic of a Novel Asymmetric Nonlinear Model Using Pneumatic Spring

The paper introduces an innovative asymmetric nonlinear vibration isolation table (ANVIT) by combining an isolator with a vertical negative stiffness corrector. Firstly, the configuration of the ANVIT is presented in a schematic diagram. Secondly, its pneumatic force model is derived. Since then, the dynamic stiffness of the system is obtained. Therefore, the vibration transmissibility effectiveness of the proposed model is predicted. The Normal form method is employed to find out the cut frequency and the corresponding phase which is beneficial for the controlling of the transmissibility characteristic. Consequently, the relation between the pressure ratio and the resonant peak is determined. Finally, the simulation results illustrate that the stiffness of the ANVIT depends on the pressure of the cylinder which can be controlled by adjusting the volume of the auxiliary chamber.