Shock response and energy analysis of quasi-zero stiffness (QZS) vibration isolation platform is carried out. To focus on the shock performance and energy loss characteristics

the six-degree freedom nonlinear dynamic equations of the QZS system under impact excitation are deduced firstly. The shock response of system is numerically analyzed and compared with that of the corresponding linear isolation system. Subsequently

the influences of damping and structural parameters on the buffering performance are analyzed by using the energy loss velocity as the evaluation index of the buffering performance. The results indicate that the response amplitude of system is higher than that of the corresponding linear system

but the response of the QZS system declines faster than that of the corresponding linear system

and the number of periods required for attenuation is less than that of the linear system. Therefore

the damping can improve the buffering performance

and the stiffness ratio and inclination angle have few impacts on the buffering performance of the QZS vibration isolation platform.