某型车用发电机电磁噪声的数值仿真  

Numerical Simulation on the Electromagnetic Noise of a Vehicle Alternator

作　　者：贺岩松[1,2] 张全周 赵勤[2] 孔祥杰 

机构地区：[1]重庆大学汽车工程学院,重庆400044 [2]汽车噪声振动和安全技术国家重点实验室,重庆401120

出　　处：《汽车工程》2017年第10期1198-1202,共5页Automotive Engineering

基　　金：国家自然科学基金(51275540);汽车噪声振动和安全技术国家重点实验室项目(Q145615)资助

摘　　要：针对某型车用爪极发电机存在的电磁噪声问题,建立了发电机的电磁学有限元模型、动力学有限元模型和声学边界元模型,进行多物理场耦合的数值仿真,获得发电机的电磁力波、振动响应和外部声场噪声等信息。对比仿真与实验分别得到的测试半球面上的平均声压级,发现两者吻合较好,说明该数值仿真方法具有较高的精度。最终结果表明,发电机后端盖无支耳一侧的36阶振动是引起电磁噪声的主要原因,为车用发电机的电磁噪声控制提供了参考。Aiming at the existing electromagnetic noise issue of a vehicle claw-pole a l te rn a to r,the electro-magnetic finite element （ FE ） model,dynamics FE model and the acoustic boundary element model of alternator are built to conduct a mul t i- physical- f ield coupl ing numerical s im u la t io n,w ith the informat ion on the electromagnetic force wave,vibration response and exterior acoustic noise f ie ld of alternator obtained. The comparison on the average sound pressure level on the testing semi-spherical surface obtained from simulat ion and experiment show that both results agree wel l wi th each other,demonstrating the high accuracy of the numerical simulat ion scheme adopted. The final results indicate that the main source of the electromagnetic noise of alternator is the 36th order v ib ra t io n of the side without lug of its rear-end cover,p ro v id ing references fo r the electromagnetic noise control of vehicle a lte rna to r.

关 键 词：车用发电机 电磁噪声 多物理场耦合仿真 噪声源识别 

分 类 号：U463.631[机械工程—车辆工程]