Experimental study of nonlinear dynamic characteristics for three types of hydraulic engine mounts and parameters identification method

Hydraulic engine mount (HEM) has the best performanceamong the passive engine mounts and is the first option for design of mounts for vibration isolation of powerplant. Based on the third generation of HEM, which has three typesof hydraulic mechanisms such as the inertia track, the decoupler and the disturbing plate, some changes of the inertia track are made or the hydraulic mechanisms are organized again, then the influences of the hydraulic mechanisms, the length of the inertiatrack and the local loss of fluid flow at theentrance of the inertia track to the dynamic characteristics of HEM are experimentally studied, the working principle of the three types of hydraulic mechanisms and the relationship between the three types of HEMs arerevealed clearly. These results will be helpful to the selection of the design scheme of HEM, and the lumped parameters model of HEM and its analytical conclusions are proved to be correct. Based on the fact that the experimental results and the analytical results arematched w