摘要
针对某自主车型侧风下出现风噪较大的问题,查找原因发现A柱设计缺陷使其在侧风下成为一个显著的噪声源。基于CFD分析方法发现,通过增加A柱装饰件和修改A柱型面,均能明显减小气流分离区。在风洞中对增加A柱装饰件的优化方案进行了由车外至车内的风噪测试,测试结果表明,该方案对侧窗表面声压级和语言清晰度有明显的优化效果。总结出A柱的设计要点及风噪的改善措施,指出在车身开发过程中必须对A柱进行侧风稳态分析。
Investigation is made to a Chinese brand vehicle which has awful aerodynamic noise in cross wind environment, it is found that A-pillar design defect makes it a noise source in cross wind. It is identified based on CFD analysis method that airflow separation zone is markedly decreased by installing A-pillar garnish and modifying the A- pillar surface. Then the optimization of adding A-pillar garnish has been tested in wind tunnel, which includes the SPL （sound pressure level） test on the side window surface and in the passenger cabinet, the results show that the average SPL of test point on side window surface and the speech intelligibility index in passenger cabinet have a distinct improvement. Finally the design key points and noise improvement measures for A-pillar is summarized, the crosswind flow field analysis for A-pillar is necessary in car body design process.
出处
《汽车技术》
北大核心
2015年第9期41-44,共4页
Automobile Technology
关键词
汽车整车
降低风噪
CFD
A柱
Vehicle, Aerodynamic noise reduction, CFD, A-pillar
