车辆与动力技术

针对某8极48槽新能源汽车电驱动系统在高速工况下出现的轰鸣音问题，采用西门子LMS声学采集软件与Fluent流体仿真软件开展数值分析与试验验证。通过LMS实车测试与主观评价，确认该轰鸣音由1阶次噪声主导，结合阶次产生机理，推测其源于转子动平衡不良。利用Fluent对转子内部油液流动进行仿真分析，发现部分冷却油液进入转子后积聚于内部角落无法有效排出，影响转子动平衡。基于此，采用CATIA 3D数模软件对转子结构进行优化设计，增加排油槽与径向排油沟槽，改进后流体仿真显示转子内部无明显油液滞留。搭载优化后转子的实车验证结果表明无轰鸣音。本文研究成果可为新能源汽车电驱动系统1阶次及其倍频次异响问题的分析与优化提供参考。

To address the rumbling noise issue occurring in an 8-pole 48-slot electric drive system of new energy vehicles under high-speed operation,numerical analysis and experimental validation were conducted using Siemens LMS acoustic acquisition software and Fluent fluid simulation software.Through LMS real-vehicle testing and subjective evaluation,it was confirmed that the rumbling noise was primarily caused by first-order noise.Combining with the noise generation mechanism,it was inferred to originate from poor rotor dynamic balance.Fluent simulation of internal oil flow revealed that some coolant entering the rotor accumulated in internal corners without effective drainage,impairing rotor dynamic balance.Based on this,CATIA 3D modeling software was employed to optimize rotor structure by adding oil drainage grooves and radial oil discharge channels.Improved fluid simulations demonstrated no significant oil retention within the rotor.Real-vehicle tests with the optimized rotor showed complete elimination of rumbling noise.The research findings provide valuable references for analyzing and optimizing first-order noise and its harmonic frequency anomalies in electric drive systems of new energy vehicles.