基于LBM和SEA的整车气动噪声及其传播分析与优化探索

Analysis and Optimization of Vehicle Aerodynamic Noise and Propagation Characteristics Based on Lattice-Boltzmann Method and SEA

针对某轿车气动噪声偏大的问题,基于格子波尔兹曼和统计能量分析法展开车内噪声计算。将分析结果与风洞试验进行对比,并依托准确的数值模型为基础,针对性地展开了造型优化。结果表明,该模型在主、客观评价体系中都能较好地符合实际噪声,对后视镜等外表面特征的优化可有效减小前侧窗表面的气压及声压脉动,削弱中高频的影响。该方法为整车风噪在产品前期开发阶段的概念设计及优化工作提供了一定的指导依据,可有效减少开发周期。

A vehicle emitted louder aerodynamic noise at high speed.To solve this problems,numerical calculation was carried out based on Lattice-Boltzmann and Statistic Energy Analysis（SEA）.Meanwhile analysis results were compared with full-scale wind tunnel vehicle test,and styling optimization was carried out based on accurate calculation model.The results showed that this model could well simulate actual wind noise in both the subjective and the objective evaluation system,and rear view mirror optimization could effectively reduce aerodynamic and sound field pressure fluctuation on the front side window,inner sound pressure level curve was obviously weakened at middle-high frequency band.This method provided some guidance for vehicle wind noise design and optimization in predevelopment stage which could effectively shorten development cycle.