Dynamic characteristics and parametric sensitivity of engine air spring hydraulic mount

Aiming at dynamic characteristics and parametric sensitivity of automobile engine air spring hydraulic mount, the equivalent volume stiffness of the mount's upper liquid chamber was used to replace effects of decoupling membrane and closed air chamber on the mount's dynamic characteristics. Based on the corresponding theory of fluid mechanics, the mount's mechanical model was established. The correctness of the model was verified with tests. Dynamic characteristics of air spring were analyzed when air chamber was opened and closed. The model was used to study effects of air spring hydraulic mount's parameters, such as, rubber main spring's volume stiffness, damping coefficient and equivalent piston area, equivalent volume stiffness of upper liquid chamber when air chamber is opened and closed, liquid inertia coefficient and damping one of inertial channel on the mount's dynamic stiffness and damping angle to obtain these parameters' sensitivities to the mount's dynamic stiffness. It was shown that the study results are helpful for optimizing design of the mount's dynamic characteristics, shortening its R&D period and saving its R&D costs. © 2019, Editorial Office of Journal of Vibration and Shock. All right reserved.