基于子区间修正摄动法的汽车高频噪声优化设计

Optimal Design of Vehicle High Frequency Noise Based on Sub-Interval Modified Perturbation Method

为抑制声学包零件参数较强的不确定性引起的车内高频噪声大范围波动,提出了一种基于子区间修正摄动法的汽车高频噪声不确定性分析与优化方法,首先建立汽车高频噪声分析的统计能量基本方程,将不确定性参数划分为若干子区间,采用修正区间摄动法计算每个子区间的摄动半径,得到高频噪声性能的中心值和摄动半径,并利用区间不确定性优化方法对车辆的高频噪声性能和零件质量进行了优化设计。应用该方法对某车型的内前围、地毯进行分析和优化设计,结果表明,优化后,声学包零件质量减轻了3%,噪声波动区间下降幅度超过35%,系统的稳健性显著提升。

To restrain the fluctuation of high frequency noise in the vehicle caused by The uncertainty of the parameters of the acoustic package,this paper proposed an uncertainty analysis and optimization method based on sub-interval modified perturbation method for high frequency noise of automobiles.Firstly,the basic equation of statistical energy for the analysis of high frequency noise was established.Secondly,the uncertainty parameters were divided into several sub-intervals,and the perturbation radius of each sub-interval was calculated by using the modified interval perturbation method to obtain the center value and the perturbation radius of the high-frequency noise performance.Finally,the high frequency noise performance and parts quality of the vehicle were optimized by the cross-interval uncertainty optimization method.This method was applied to analyze and optimize the interior front circumference and carpet of a vehicle.After optimization,the weight of acoustic package parts decreases by 3%,the noise fluctuation range decreases by more than 35%,and the robustness of the system is significantly improved.