Abstract
The stiffness of mounting system determines the vibration isolation ability of the transmitted path, which is the key factor that affects the vibration and noise of vehicle. In order to improve the vibration isolation ability of the powertrain mounting system, considering the powertrain of front wheel drive car as the research object, the vibration decoupling rate and its corresponding frequency of the powertrain mounting system are analyzed by rigid body dynamics and energy method. The correctness of the calculation program with energy method has been verified by calculated vibration decoupling rate. Based on the genetic algorithm and the fusion robustness analysis, the decoupling rate and modal frequency of the mountings in all directions are considered as the objectives; the stiffness of the three mountings is optimally designed. Through multi-excitation of three methods and vehicle test, the vibration response characteristics and the vibration noise test data of the optimization stiffness are compared and the results shown that the vibration isolation performance has been significantly improved more than 10%. An integrated design method of stiffness optimization design and vibration analysis in vehicle PMS is formed, which has theoretical and practical value, and can reduce vehicle vibration and noise.
Highlights
Noise, vibration, and harshness (NVH) performance is one of the main attributes in a passenger car
It is an effective way that vibration decoupling of the 6 degrees of freedom of Powertrain Mounting System (PMS) to improve the level of vibration isolation in transmitted path, and it is the key measures to improve the vehicle vibration and noise level.[2]
The flow route of optimization design method of PMS is shown in Figure 12: 1. The decoupling rate and modal frequency of PMS are calculated by two methods which are the rigid body dynamic method and the energy method
Summary
Vibration, and harshness (NVH) performance is one of the main attributes in a passenger car. Keywords Powertrain mounting system, optimization design, genetic algorithm, energy method decoupling, vibration analysis, multi-excitation The major contribution of this article is to optimize design methods for determining mount stiffness and considering vibration analysis of multi-excitation under excitation of engine and ground.
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