基于整车试验的低频声固耦合有限元模型修正  

Finite Element Model Updating of Low Frequency Acoustic Structure Coupling Based on Vehicle Test

作　　者：蔺朝莉[1] 彭勇 陈志军[1] 甘守武[1] 吕向飞[3] LIN Zhaoli;PENG Yong;CHEN Zhijun;GAN Shouwu;LYU Xiangfei(Chongqing College of Electronic Engineering, Chongqing 400054, China;Chongqing Chang'an Automobile Co., Ltd., Chongqing 400102, China;State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China)

机构地区：[1]重庆电子工程职业学院,重庆400054 [2]重庆长安汽车股份有限公司,重庆400102 [3]重庆大学机械传动国家重点实验室,重庆400044

出　　处：《重庆理工大学学报（自然科学）》2019年第9期95-98,共4页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆市教育科学规划课题(2016-GX-168);中国高等教育学会职业技术分会课题(GZYZD2016015);重庆电子工程职业学院科研平台项目(XJPT201703)

摘　　要：建立了某轿车的整车有限元模型,并考虑结构阻尼和内饰材料声学阻抗的影响,对整车的声固耦合有限元模型进行了修正。通过实车的道路试验,获得了50 km/h匀速工况下的激励信号及相应的车内噪声信号。以实测激励信号作为有限元模型的输入,对声固耦合模型进行20~200 Hz频率范围内的低频噪声的频响分析。结果表明:所建立的阻尼修正后的声固耦合有限元模型可用于车内低频噪声的预测,可为汽车NVH正向设计、整车振动噪声的预测和改进提供参考。The finite element model of a car is established,and the acoustic-structure coupling finite element model of the car is modified considering the influence of structural damping and acoustic impedance of interior material. Through the road test of a real vehicle,the excitation signal and the corresponding interior noise signal under the condition of 50 km/h uniform speed are obtained. Taking the measured excitation signal as the input of the finite element model,the frequency response analysis of the low frequency noise in the frequency range of 20-200 Hz is carried out. The results show that the modified acoustic-structure coupling finite element model can be used to predict the lowfrequency noise in the vehicle. The research in this paper can provide reference for vehicle NVH forward design,vehicle vibration and noise prediction and improvement.

关 键 词：低频噪声 声固耦合 有限元模型 阻尼修正 整车试验 

分 类 号：U462[机械工程—车辆工程]