侧风下某车型A柱风噪优化研究
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- 英文论文题名：A Study on Aeroacoustic Noise Optimization for a Vehicle A-pillar Under Crosswind
- 论文作者：王俊 ; 龚旭 ; 董国旭 ; 陈如意 ; 李林
- 英文论文作者：Wang Jun ; Gong Xu ; Dong Guoxu ; Chen Ruyi ; Li Lin ; Chongqing Changan Auto R&D Center ; Changan Automobile Co. ; Ltd ; State Key Laboratory of Vehicle NVH and Safety Technology
- 年：2016
- 作者机构：重庆长安汽车股份有限公司汽车工程研究总院;汽车噪声振动和安全技术国家重点实验室;
- 论文关键词：汽车 ; 风噪 ; A柱 ; 侧风 ; 风洞测试
- 英文论文关键词：vehicles ; aeroacoustic noise ; a-pillar ; crosswind ; wind tunnel test
- 会议召开时间：2016-10-26
- 会议录名称：2016中国汽车工程学会年会论文集
- 英文会议录名称：Proceedings of 2016 SAE-China Congress
- 语种：中文
- 分类号：U463.83
- 学会代码：QCGC
- 会议名称：2016中国汽车工程学会年会暨展览会
- 会议地点：中国上海
- 主办单位：中国汽车工程学会
- 学会名称：中国汽车工程学会
- 页数：1
- 文件大小：43k
- 原文格式：O
- 会议级别：全国
摘要
首先通过CFD分析发现某车型在侧风下风噪明显变大,而减小前风窗与A柱的断差和优化A柱型面可将A柱气流分离区体积分别减小约35%和20%,而在A柱添加装饰件可明显地减小A柱分离区的体积,最大降幅可达到64%。其次,通过大涡模拟对侧风下A柱装饰件和原状态的流动特征和侧窗表面声压级进行对比分析表明,A柱添加装饰件后侧窗表面的面积权重声压级在62.5~2000Hz范围内可降低2.4~6.1dB。车内测试表明,装饰件方案对声压级和语音清晰度有明显的改善效果,且侧风下效果更明显,最大可到1.4dB(A)和8.1%。最后简洁地总结了A柱的设计要点和改善风噪的措施。
Firstly,it is found by CFD analysis that the aeroacoustic noise of a vehicle obviously increases under a crosswind condition and reducing the flush between front windshield and A-pillar and optimizing A-pillar surface can decrease the volume of airflow separation zone by 35% and 20%respectively under crosswind,and adding a garnish part on flush can significantly reduce the volume of airflow separation zone up to 64% at most.Next,the flow characteristics and the sound pressure level of side window surface of the scheme with garnish part added and original state under crosswind are comparatively analyzed by large eddy simulation with a result showing that with the garnish part added,the area weighted sound pressure level of side window surface lowers by 2.4~6.1dB in a frequency range of 62.5~2000Hz.Then,an interior testing indicates that the sound pressure level and speech articulation has apparent improving effect,which in particular in low frequency range,can be up to 1.4dB(A) and 8.1% respectively.Finally the design highlight of A-pillar and the measures for improving wind noise are briefly summarized
Firstly,it is found by CFD analysis that the aeroacoustic noise of a vehicle obviously increases under a crosswind condition and reducing the flush between front windshield and A-pillar and optimizing A-pillar surface can decrease the volume of airflow separation zone by 35% and 20%respectively under crosswind,and adding a garnish part on flush can significantly reduce the volume of airflow separation zone up to 64% at most.Next,the flow characteristics and the sound pressure level of side window surface of the scheme with garnish part added and original state under crosswind are comparatively analyzed by large eddy simulation with a result showing that with the garnish part added,the area weighted sound pressure level of side window surface lowers by 2.4~6.1dB in a frequency range of 62.5~2000Hz.Then,an interior testing indicates that the sound pressure level and speech articulation has apparent improving effect,which in particular in low frequency range,can be up to 1.4dB(A) and 8.1% respectively.Finally the design highlight of A-pillar and the measures for improving wind noise are briefly summarized
引文
(一)本书仅收录摘要,全文刊载在《汽车工程》(2016年第10期)。