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Modeling and analysis of dynamic characteristics of rubber isolators for electric vehicles under high-frequency excitation
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering ( IF 1.7 ) Pub Date : 2022-07-24 , DOI: 10.1177/09544070221114683
Xiao-Ang Liu, Jiaqi Zhang, Xing Jia, Sen Xiao, Daliang Chen, Wen-Bin Shangguan

The rubber isolator is a key component connecting the vehicle body and the powertrain, which plays a significant role in reducing the vibration transmission from the engine to the vehicle body. With the development of electric vehicles, the excitation frequency generated by the powertrain can exceed 2 kHz. The conventional dynamic models are usually used to simulate the low-frequency dynamic characteristics of rubber isolators, in the range of 0–200 Hz, which is the main excitation frequency range of the traditional internal combustion engine vehicle. However, they cannot simulate the high-frequency dynamic characteristics accurately since the inertial force caused by the mass of rubber isolators increases greatly under high frequencies. And the high-frequency dynamic characteristics of rubber isolators is of great significance for isolator fatigue life prediction, powertrain system vibration isolation design and noise control caused by the high-frequency resonance of the isolator. In this paper, a general model with mass elements is proposed to describe the effect of the inertial force on high-frequency dynamic stiffness. Based on the proposed model and considering the different expressions of the viscoelastic properties of rubber isolators, three improved dynamic models of rubber isolators are established, and used to analyze the high-frequency dynamic characteristics of rubber isolators. It has been demonstrated that the inertial force plays a non-negligible role in the dynamic characteristics of rubber isolators under high-frequency excitation. The proposed model can be used to analyze the effect of the inertial force on the dynamic characteristics at high frequencies accurately. The high-frequency dynamic characteristic modeling method of rubber isolators presented in this paper is helpful to the vibration and noise analysis of electric vehicle powertrain systems under high-frequency excitation.



中文翻译:

高频激励下电动汽车橡胶隔振器动态特性建模与分析

橡胶隔振器是连接车身和动力总成的关键部件,对减少从发动机到车身的振动传递具有重要作用。随着电动汽车的发展,动力总成产生的激励频率可以超过2kHz。常规动力学模型通常用于模拟橡胶隔振器的低频动态特性,范围为 0~200 Hz,这是传统内燃机汽车的主要激励频率范围。但是,由于橡胶隔振器的质量引起的惯性力在高频下会大大增加,因此无法准确模拟高频动态特性。而橡胶隔振器的高频动态特性对隔振器的疲劳寿命预测、动力总成系统隔振设计和隔振器高频共振引起的噪声控制具有重要意义。在本文中,提出了一个具有质量元的通用模型来描述惯性力对高频动态刚度的影响。在该模型的基础上,考虑橡胶隔振器粘弹性性能的不同表现形式,建立了橡胶隔振器的三个改进动力学模型,用于分析橡胶隔振器的高频动态特性。已经证明,在高频激励下,惯性力对橡胶隔振器的动态特性起着不可忽略的作用。该模型可用于准确分析惯性力对高频动态特性的影响。本文提出的橡胶隔振器高频动态特性建模方法有助于电动汽车动力总成系统在高频激励下的振动和噪声分析。

更新日期:2022-07-26
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