Abstract
Hydraulic engine mounts are used in the automotive industries because they offer frequency and amplitude response. Such non-linear dynamic characteristics are examined by using analytical and experimental methods, both at the device level and within the context of a simplified vehicle model. A new lumped parameter non-linear mathematical model of the hydraulic mount is developed by simulating its decoupler switching mechanism and inertia track dynamics The model is capable of capturing both the low- and highfrequency behaviour of hydraulic mounts. The two mounts considered here within differ by the means in which the decoupler is used to control the amplitude-dependent behavior of the hydraulic mount. Both of the mounts decoupler action introduces nonlinearities into the system; however, one mount illustrates parametric-type behavior.