特征响度在商用车怠速轰鸣噪声优化中的应用

Application of Specific Loudness Analysis Method in Commercial Vehicle Idling Noise Optimization

某型商用车怠速时驾驶室内出现严重低频轰鸣噪声,严重影响驾驶人员舒适性。为探究该问题产生机理并寻求有效解决方法,文中采用传递路径分析、工作变形分析和模态试验等手段排查确定了进气道结构是影响轰鸣噪声的关键因素。文中结合CAE仿真方式确定结构优化方向,并对优化样件进行实物与仿真的对标验证,经实车验证可有效消除轰鸣噪声。此外,文章在噪声优化过程中应用特征响度评估分析方法,建立客观测试数据和主观感受建立有效关联,为噪声优化增添评价手段。

When a commercial vehicle idles,serious low-frequency booming noise appears in the cab,which affects the comfort of drivers.In order to explore the mechanism of the problem and find an effective solution,the transfer path analysis,operational deflection shape analysis and modal test are used to determine that the inlet is the main influencing factor.Combined with CAE simulation,the direction of structural optimization is determined,and the modal benchmarking of the optimized sample is verified,which can effectively eliminate the booming noise.In addition,in the process of noise optimization,the specific loudness evaluation method is applied to establish an effective correlation between objective test data and subjective feelings,which adds evaluation means for noise optimization.