Abstract
The design strategies for powertrain mounting systems play an important role in the reduction of vehicular vibration and noise. As stiffness and damping elements connecting the transmission system and vehicle body, the rubber mount exhibits better vibration isolation performance than the rigid connection. This paper presents a complete design process of the mounting system, including the vibration decoupling, vibration simulation analysis, topology optimization, and experimental verification. Based on the 6-degrees-of-freedom vibration coupling model of the powertrain mounting system, an optimization algorithm is used to extract the best design parameters of each mount, thus rendering the mounting system fully decoupled and the natural frequency well configured, and the optimal parameters are used to design the mounting system. Subsequently, vibration simulation analysis is applied to the mounting system, considering both transmission and road excitations. According to the results of finite element analysis, the topological structure of the metal frame of the front mount is optimized to improve the strength and dynamic characteristics of the mounting system. Finally, the vibration bench test is used to verify the availability of the optimization design with the analysis of acceleration response and vibration transmissibility of the mounting system. The results show that the vibration isolation performance of the mounting system can be improved effectively using the vibration optimal decoupling method, and the structural modification of the metal frame can well promote the dynamic characteristics of the mounting system.
Highlights
The vibration isolation design of vehicle powertrain systems is important for improving the noise, vibration, and harshness performance of vehicles, and it has been widely studied
The results showed that the design process of the mounting system could well improve the vibration isolation performance
Motor the optimization is approximately 1/3 of that before the optimization. It shows that the optimization method can significantly reduce the vibration transmissibility and effectively improve the vibration isolation performance of the mounting system
Summary
The vibration isolation design of vehicle powertrain systems is important for improving the noise, vibration, and harshness performance of vehicles, and it has been widely studied. The rubber mount structure design of the transmission system, which is the main vibration source, directly affects the vibration coupling state of each degree of freedom (DOF) of the powertrain system, and affects the vehicle ride and handling performance [1]. Vibration optimal decoupling is an effective way to improve the vibration isolation effect of the rubber mount [2]. Johnson et al [3], for the first time, performed the optimization of the mounting system design. Hu et al [7] proposed a
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