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1??ü′ê￡oDü???μí3￡?2???D?ê?￡??a??????￡?ó??ˉéè??￡?MATLAB, ADAMS, ?ˉì??ìó|




ABSTRACT
The exciting forces from engine and road are two main vibration sources that cause vehicle vibrating, the engine mount system plays an important role in isolating vibration. firstly, it must isolate the transfer of vibration from engine to body, secondly, it must prevent the body vibration caused by road from engine-mount system. The performance of engine mount system has much effect on NVH performance of car, so the mount system design is always a hot topic in vehicle design trade. At present, there are two main methods to design mount system, one is the traditional method¨Dmode decoupling, which controls the system response by changing the stiffness matrix to arrange system modes; the other one controls force transfer between the engine and body by optimizing the parameters of mounts with dynamic response as objective directly. With the two methods, optimization of engine mount system of some national FF car is studied in this paper. The following content is included:?￠
1 The mathematic model of engine mount system that is used to mode decoupling is set up, With energy mode decoupling theory, the modes of engine mount system are decoupled
2 According to the rules that are applied to the power train?ˉs six rigid body modes frequency targets, couple vs. decoupled modes, etc. The selection and laying out mount locations and specifying the insulators are completed in the design phase considering the package restraints
3 A six-degrees rigid dynamic model are developed under the ADAMS environment and then depending on the computed response sensitivities to determine the changes to the mounting system that will lead to minimum response at user-defined location in the vehicle. Design variables are mount locations, angle and mount stiffnesses, which are changed until the lowest level of response is found. The isolation characteristics results from the application of this method is quite better than the traditional ??rules ¨Cof-thumb?ˉ methods.


Key words: mounting system, mode-decoupling ,the optimizing design, MATLAB, ADAMS, dynamic response

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