CAJ | 학술논문

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。
침대모자주차형측풍하출현풍조교대적문제，사조원인발현A주설계결함사기재측풍하성위일개현저적조성원。기우CFD분석방법발현，통과증가A주장식건화수개A주형면，균능명현감소기류분리구。재풍동중대증가A주장식건적우화방안진행료유차외지차내적풍조측시，측시결과표명，해방안대측창표면성압급화어언청석도유명현적우화효과。총결출A주적설계요점급풍조적개선조시，지출재차신개발과정중필수대A주진행측풍은태분석。
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.