DefinePK

Abstract

In order to assess the vehicle ride comfort performance between the hydraulic engine mount system (HEMs) and rubber engine mount system (REMs), both dynamic models of the hydraulic engine mount (HEM) with inertia track and decoupler and the rubber engine mount (REM) are established to determine the vertical forces. And then the vertical forces of engine mounts are linked with a full-vehicle dynamic model under the combination of two excitation sources such as internal combustion engine and road surface excitations. The time domain root mean square (r.m.s) and power spectral density (PSD) acceleration responses of the vertical motion, pitch and roll angles of vehicle body are chosen as objective functions to compare the vehicle ride comfort performance of the two engine mounts. The study results show that the values of the root mean square (r.m.s) acceleration responses with HEMs are respectively reduced in comparison with REMs and the peak values of PSD acceleration responses are respectively reduced when compared with REMs in low frequency region from 0.5Hz to 10Hz when both the vehicle and engine operate under the different operating conditions. Vehicle ride comfort is significantly improved with HEMs in low frequency region.