Powertrain mounting system optimization to improve vibration behavior for EF7 engine

Improvement and optimization of the Powertrain mounting system are one of the ways to improve the performance NVH cars. The study aims to find the optimal stiffness coefficients for each mount in three directions. The natural frequencies of the system remain steady and stay away from the excitation frequencies, so that the system does not a resonance. It was also, using the decoupling vibration mode theory the kinetic energy matrix was optimized. Powertrain as a rigid model with 6 degrees of freedom, and the engine mounts in the Kelvin-Voight model. To optimize the genetic algorithm in MATLAB software was used. By inventing a reverse method, using the proposed natural frequencies, we calculated the allowable range for the stiffness coefficients. Using this method compared to the conventional methods for determining the range of stiffness in the optimization algorithm, the results show that the natural frequency range is 17.2%, system decoupling modes 7% and in some of the modes 14%, objective function 7.5% improved. By using this method and using optimized stiffness coefficients, the decoupling of system modes 54% relative to non-optimal state improved.