摘要
基于Lighthill气动声学理论方程和偶极子声源的假设,提出了一种计及气流再生噪声的消声器消声量的分析方法,利用该方法计算插入管式消声单元消声量的结果比不考虑气流再生噪声的计算结果的精度要高很多,尤其是气流速度较高时,和试验结果较接近。应用该方法对某SUV车的消声器进行了设计和优化后,怠速噪声约降低2.4dB（A）,在不同转速下,定置噪声约下降5~7dB（A）,消声效果显著提高。
An analysis method of the sound attenuation of muffler with consideration of air flow regenerated noise is proposed based on Lighthill＇s equation of aerodynamics and the assumption of dipole sound source.The calculation results of the sound attenuation of inserted tube muffler element using the method show higher accuracy than that without considering the effects of flow regeneration noise,in particular at higher flow velocity,where they are much closer to test results.By applying the method to the design and optimization of the muffle in a SUV,its idling noise and stationary noise reduce by 2.4dB（A） and 5 to 7dB（A） respectively,showing remarkable rise in sound attenuation effects.
出处
《汽车工程》
EI
CSCD
北大核心
2011年第7期632-635,共4页
Automotive Engineering
基金
河南省基础与前沿技术研究项目(112300410141)
重庆市汽车零部件重大专项项目(CSTC
2008AB6108)资助
关键词
消声器
气流再生噪声
消声量
muffler
air flow regeneration noise
sound attenuation
