| It is a crucial task to design an ideal engine mount to isolate the vibration andreduce the noise from power train to frame. Nowadays, research in this field mainlyfocus on the mode's decouple, but seldom make the minimal response as an objective toimprove the power train's isolation characteristics. in allusion to present status indomestic, this paper discusses the rule of arrangement and the flexible foundationeffects on dynamic responses of engine-mount systems using computer simulationtechniques. The following subjects are mainly studied.According to the rules that are applied to the power train's six rigid body modes:frequency targets, couple vs. decoupled modes, etc. The selection and laying out mountlocations and specifying the insulators are completed in the design phase consideringthe package restraints.A six-degrees rigid dynamic model are developed under the ADAMS environment,and then depending on the computed response sensitivities to determine the changes tothe mounting system that will lead to minimum response at user-defined location in thevehicle. Design variables are mount locations, angle and mount stiffnesses, which arechanged until the lowest level of response is found. The isolation characteristics resultsfrom the application of this method is quite better than the traditional 'rules –of-thumb'methods.Then the flexible foundation's effects on dynamic responses of engine-mountsystems are considered with the help of computer simulation techniques, the dynamicflexible of the foundation is represent of the foundation is represented by modalinformation from finite element analysis of ANSYS, solving the derived equations,natural frequencies and forced vibration responses can be simulated accurately. And theeffect of engine-mount for the vehicle's NVH are studied.At the same time, the foundational design procedures and basic requirements ofengine mount system are studied. Accordingly, many designing principle are valuablefor all the other kind of mounting system. |
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