摘要
关于整车车内噪声的仿真分析方法,在理论上,FEM/BEM方法可以进行全频段的仿真,但由于高频噪声的波长短,且在仿真初期结构材料的参数不确定,FEM/BEM参数识别和计算难度大,在这种情况下,基于能量平均思想的统计能量方法显现出其特定的求解优势。针对SEA分析方法理论就该方法在车内噪声应用领域展开探讨,从整车车内噪声激励源及噪声传递途径、整车NVH性能开发方法和整车SEA建模方法三个角度对车内高频噪声仿真进行阐述。SEA仿真在整车方面的应用现阶段主要用来指导声学包开发,对SEA仿真中的关键科学问题与工程实际的结合,介绍2个典型工程案例:其一基于双墙理论的车门隔声量优化,通过建立相对独立的双墙模型,提高建模过程中的仿真精度;其二通过控制声学包装优化变速箱高频啸叫,采用车内双层地毯的优化方法,降低驾驶员头部的声压1.31 d B。通过SEA方法对车内高频噪声进行仿真显著改善车辆的NVH性能,提高车辆乘坐舒适性,可为相关领域的研究提供参考及借鉴。
Among the simulation analysis methods of vehicle interior noise,the FEM/BEM method can be used to simulate in the whole frequency band theoretically.However,due to the short wavelength of high frequency noise and the material uncertainty in preliminary simulation,it is difficult to identify the FEM/BEM parameters and realize the calculation.In this case,the statistical energy analysis(SEA)method based on energy averaging has specific advantage.In this paper,the application of this method to internal noise simulation of vehicles is discussed.The theory of the SEA analysis method is summarized.The internal high-frequency noise simulation is elaborated in three aspects:the excitation source and transfer path of the internal noise,the method of NVH performance development and the SEA modeling method.The application of the SEA simulation in the vehicle is mainly used to guide the development of acoustic package.To combine the key scientific problem in the SEA simulation with engineering practice,two typical examples are given.The first is to improve the simulation accuracy by establishing a relatively independent double leaf model based on double wall theory;and the second is to optimize gearbox’s high-frequency howling by controlling the acoustic package.The sound pressure near the driver’s head is reduced by1.31dB by laying double layer interior carpet.The simulation and reduction of the high frequency noise by using the SEA can significantly improve the NVH performance and the ride comfort of the vehicle.This paper may provide a reference for related fields.
作者
侯献军
郭金
杜松泽
郭彩祎
刘志恩
HOU Xian-jun;GUO Jin;DU Song-ze;GUO Cai-yi;LIU Zhi-en(Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology, Wuhan 430070, China;Hubei Collaborative Innovation Center for Automotive Components Technology,Wuhan 430070, China)
出处
《噪声与振动控制》
CSCD
2017年第5期119-123,共5页
Noise and Vibration Control
基金
基金项目:汽车排气噪声品质的阶次量化与声音设计研究(51575410)
关键词
声学
整车噪声
高频噪声
子系统
统计能量法
噪声控制
acoustics
vehicle noise
high-frequency noise
subsystem
statistical energy analysis (SEA)
noise control
