等效辐射声功率分析方法在控制车内低中频噪声中的应用

Application of Equivalent Acoustic Radiation Power Analysis In The Control of Low-Middle Frequency Noise In The Vehicle

为解决汽车车内低中频噪声对驾驶员及乘客的乘坐舒适性问题,以某SUV汽车作为研究对象,以等效辐射声功率(ERP)理论为基础,利用有限元数值仿真技术,分析在Trim Body(TB)车身硬点连接处施加三向振动加速度进行模态频率响应分析,根据车身ERP的响应,在车身前围板、前地板、后地板、后轮罩及车身顶盖,合理的布置阻尼贴片。最后,通过对比有无阻尼贴片状态下的驾驶员及后排乘客的辐射声功率及噪声传递函数(NTF),分析结果表明:增加阻尼贴片的辐射声功率在200-400Hz最大能降低4dB(A),同时NTF较优化前在100Hz-300Hz有3-5dB的降低,在300-400Hz有最大将近10dB的降幅,优化效果较为理想,为解决车内噪声中低频声品质问题提供了优化思路及方向。

In order to solve the driver’s and passenger’s comfort problems of low-middle noise in vehicles,a SUV vehicle was taken as the research object,and the equivalent radiation acoustic power(ERP)theory was used as the basis to analyze the finite element numerical simulation technology.Forced modal frequency response analysis is performed by applying a three-positions vibration excitation at the hard points which connection of the Trim Body(TB)body.According to the response of the body ERP,Reasonable layout of damping patches in the front panel,front floor,rear floor,rear wheel cover,and roof cover.Finally,with the damp patches,between the 200-400 Hz,the ERP values have about 5 dB(A)reduced,at the same,by comparing the noise transfer function(NTF)of the driver and rear passengers,the optimization schemes show that,NTF result with damp patches is reduced by 3-5 dB from 100 Hz to 300 Hz,and about 10 dB drop between 300-400 Hz,and the optimization schemes are useful.It have provides optimization schemes for solving those problems of low-middle frequency sound quality in interior noise.