Dynamic behavior comparison of passive hydraulic engine mounts. Part 1: Mathematical analysis

This paper investigates the linear and nonlinear modeling aspects of two distinct types of passive hydraulic engine 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. Because one mount exhibits parametric behavior the energy-rate method is used to determine the stability of the system. The linear and nonlinear models are directly compared with each other in a frequency domain for each respective mount, and then the nonlinear models are compared directly against each other to ascertain a comparison between mount designs, again in a frequency domain.