Optimal Design Of Automotive Powertrain Mounting Systems

In modern auto manufacture field, it is known to all that people are putting forward more and more requirements on the car’s performance and comfort. Meanwhile, in recent years, the awareness of saving resource and protecting environment has been enhanced. In order to reduce fuel consumption and improve the performance of engine, automobile design changes lighter and engine speed becomes higher, while the vehicle’s vibration and noise will be increased due to lower quality and higher speed. As we know, the engine is the main excitation source in all noise and vibration source, which makes the design on the powertrain mounting system more demanding. Conversely, the optimization design on the powertrain mounting system is to satisfy people’s demands and protect the effect of engine and other parts. Good design can prevent the engine colliding with other parts during operation, reduce the vibration of the engine and extend the service life. This paper aims at this two aspects above.Engine is the main excitation source of vehicle vibration and noise. By designing properly on the powertrain mounting system, not only the riding comfort of the vehicle, but also the reliability and durability of the engine and related parts can be greatly improved.The optimization design on the powertrain mounting system has been studied more comprehensive by means of taking one refit diesel car as the subject in this paper. A6DOFs dynamics and simulation mode has been established by MSC/ADAMS after all these relevant principles and approaches have been mastered. Via experiments, the weight, assembly center, inertia of the powertrain design parameters has got. While using the three-wire-pendulum theory to solve the vibration type and frequency characteristics system modal. Energy-decoupling method is used for the optimization of stiffness and position of the engine mounting system, and the process is visual. To verify the correct of model and optimization results, experiment study of transfer characteristic was carried out, and experiment validate that the best mount matching program was received. The work has a certain value in practical application for system isolation optimization on mounting system.