某款车用发电机低速噪声源的识别与控制  

Identification and Reduction of the Noise Source of a Vehicle's Generator Operation in Low Speed Range

作　　者：石晓辉[1] 昌诗力 施全[1] 易鹏 

机构地区：[1]重庆理工大学汽车零部件制造及检测技术教育部重点实验室,重庆400054 [2]重庆市科学技术研究院,重庆401123

出　　处：《噪声与振动控制》2015年第6期69-73,共5页Noise and Vibration Control

基　　金：重庆市科技攻关重点项目(cstc2012gg-yyjs B0216;cstc2011gg B0030)

摘　　要：针对某款车用发电机低速噪声偏大的问题,首先进行发电机台架噪声试验,运用阶次分析找到主要特征阶次。采用数值模拟和试验验证相结合的方法对车用发电机结构进行模态分析,计算出发电机的前几阶固有频率与模态振型。结合噪声试验分析结果与模态特性,得出低速噪声偏大是由于发电机在电磁力波的激励下发生了共振的结论。最后提出改进建议,改进后的电机低速下噪声得到明显的改善,总体声压级降低约2 d B(A),共振处声压级降低约5 d B(A)。The problem of overlarge noise of a vehicle's generator operating in low speed range was studied. Firstly, the noise was tested in a test bench and the main orders of the noise were found by order analysis. Secondly, both numerical simulation and experimental test were applied to the modal analysis of the vehicle's generator, and the natural frequencies and vibration modes of the previous orders of the vehicle's generator were calculated. Thirdly, through the comprehensive analysis of the test results of noise and the modal characteristics, it was concluded that the overlarge noise in low speed range was caused by the generator's resonance inspired by electromagnetic force wave. Finally, some improvement suggestions were provided and the noise of the vehicle's generator operating in low speed range was reduced distinctly, the overall noise dropped by 2 dB(A), and the noise in the resonance point dropped by 5 dB(A).

关 键 词：声学 车用发电机 噪声 阶次分析 模态分析 优化 

分 类 号：TM301[电气工程—电机]