| As the main source of vibration, the powertrain system has a great impact on ride comfort and NVH characteristics for modern vehicles. A well-designed powertrain mounting system can significantly decrease the vibration transmission and improve ride comfort.In this paper, based on the CAD/CAE system integration technology, we use 3D software Pro/E, the mechanical system dynamics analysis software ADAMS and software MATLAB to build mount system modeling of a car, simulation and optimization design.First, the study applies the vibration theory and Lagrange Equation to build the dynamic equation of powertrain mounting system. Based the geometry and quality parameters which are measured from the model, we use M code in the software Matlab to develop program that can be quickly and accurately computing the natural frequencies and decoupling rates.Second, vibration characteristics including natural frequencies and decoupling rates are analyzed then. According to the practical application of engineering, aiming to improve system decoupling rates, use multi-objective optimization method to optimize the powertrain mount spindle stiffness parameters. The vibration characteristics are compared before and after optimization.At last, establish the powertrain multibody dynamic model in the ADAMS software with Pro/E. It intuitively presents the natural characteristics of the powertrain mount before and after optimization through simulation.The study proves that the vibration isolation effect is improved on comparison by optimization. The methodology is equally applicable to other mounting systems. |
