摘要
为了在电动车动力总成设计阶段估算动力总成的电磁振动噪声特性,根据集中驱动式电动车动力总成的结构特点,给出了多源动态激励下电动车动力总成噪声分析的联合仿真的方法。基于有限元建模法(finite element modeling,FEM)建立了该动力总成结构动力模型,对其进行了振动模态分析,得到了其模态参数和振动响应;基于边界元法(boundary element method,BEM)建立了该动力总成声学模型,将动力总成振动响应作为声学边界条件,对辐射声场进行了仿真分析,研究了动力总成声辐射特性。通过对动力总成进行现场振动和噪声测试分析,得到的测试结果与理论计算结果较为一致,表明了理论计算的可行性和准确性。该研究为进一步进行电动车噪声控制研究提供参考。
Evaluation of the NVH （noise, vibration and harshness） performance of automotive powertrain has been an integral part of the vehicle development process. Although electric vehicles are generally considerably quieter than their counterparts powered by internal combustion engines, some problems about NVH still exist, which are becoming more challenging in terms of the future of vehicle. Firstly, the sound only from dominant engine but not from tire, wind or auxiliaries disappears, which consequently becomes increasingly audible due to the removal of the masking sound of broadband engine. Moreover, the interior noise is characterized by high-frequency noise components which can be subjectively perceived as annoying and unpleasant. Thirdly, as the electric vehicle develops toward the direction of high speed and large torque, electric vehicle vibration and noise problems highlight gradually.
The subject of this paper is the numerical and experimental evaluation of the acoustic behavior of an electric powertrain, which is helpful for the electric vehicle in the design stage. For this purpose, a co-simulation method based on finite element modeling （FEM） and boundary element method （BEM） for the acoustic radiation analysis of an electric powertrain under multi-excitations is presented. The vibration and noise characteristics of electric vehicle are quite different from that of internal combustion engine due to different exciting forces. The calculation of the internal excitations of motor-reducer integrated drive system is the foundation of dynamic analysis. The internal dynamic excitations of a certain electric powertrain in rated revolution are calculated by theoretical analysis and numerical simulation method on the basis of gear dynamics and electromagnetism, including the electromagnetic radial force, electromagnetic tangential force and external circuit in the motor, and the time-varying gear meshing stiffness, meshing error and meshing impact in the gear system. The amplitude of the electromagnetic f
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2014年第21期40-46,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家863计划项目(2011AA11A265)
国家自然科学基金(51205290)
中央高校基本科研业务费专项资金项目(1700219118)
关键词
有限元法
边界元法
噪声
动力总成
辐射噪声
模态分析
finite element method
boundary element method
acoustic noise
electric powertrain
acoustic radiation
modal analysis
