某型车进气轰鸣问题研究
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摘要
某新开发自然吸气发动机车辆在加速过程中当发动机转速为2 000 r/min左右时车内存在轰鸣声,严重影响车内乘坐舒适性。运用道路试验分析、CAE分析等手段对噪声产生的原因进行研究,最终确定原因是进气系统压力波动导致空气滤清器振动,经由车身连接点至车内传递路径放大导致轰鸣噪声。通过优化进气系统压力波动,增加赫姆霍兹谐振腔,降低激励源,并在车身与空滤连接点增加橡胶垫片以衰减振动传递,使车内前后排噪声幅值各降低7d B左右。
There is a booming noise for a newly developed vehicle with a natural intake system when it is accelerating and the speed of the engine reaches 2 000 r/min,which seriously affects the NVH performance. In this paper,the cause of booming noise is analyzed by means of road test method and CAE method. It is found that the pressure fluctuation of the intake system induces the vibration of the air-filter. This vibration is transferred from the joint between the air filter and the car body to the monocoque and then amplified,which leads to the booming noise. Afterwards,the intake system is optimized by adding a Helmholz resonant cavity to reduce the pressure fluctuation. The rubber washer is added at the joint to attenuate the vibration transfer. Finally,the sound pressure level of the booming noise in the monocoque is reduced by 7 d B.
There is a booming noise for a newly developed vehicle with a natural intake system when it is accelerating and the speed of the engine reaches 2 000 r/min,which seriously affects the NVH performance. In this paper,the cause of booming noise is analyzed by means of road test method and CAE method. It is found that the pressure fluctuation of the intake system induces the vibration of the air-filter. This vibration is transferred from the joint between the air filter and the car body to the monocoque and then amplified,which leads to the booming noise. Afterwards,the intake system is optimized by adding a Helmholz resonant cavity to reduce the pressure fluctuation. The rubber washer is added at the joint to attenuate the vibration transfer. Finally,the sound pressure level of the booming noise in the monocoque is reduced by 7 d B.
引文
[1]邵恩坡.发动机进气噪声产生的机理及其控制[J].小型内燃机,1994,23(4):44-47.
[2]杨神林.某SUV加速行驶进气噪声分析与控制研究[D].长春:吉林大学,2012.
[3]杨诚.进气噪声产生机理分析及其降噪[J].汽车工程,2005,27(1):68-71.
[4]黄进.进气管路长度对进气噪声的影响[J].农业装备与车辆工程,2013,51(5):5-67.
[5]庞剑,谌刚,何华.汽车噪声与振动[M].北京:北京理工大学出版社,2006.
[6]侯献军.发动机进气系统性能仿真及降噪优化[J].噪声与振动控制,2011,31(5):42-45.
[7]张洪武.某乘用车进气系统对车内NVH性能贡献研究及改进[D].长春:吉林大学,2012.
[8]石岩.汽车进气系统噪声仿真分析及优化[J].噪声与振动控制,2012,32(3):129-132.
[2]杨神林.某SUV加速行驶进气噪声分析与控制研究[D].长春:吉林大学,2012.
[3]杨诚.进气噪声产生机理分析及其降噪[J].汽车工程,2005,27(1):68-71.
[4]黄进.进气管路长度对进气噪声的影响[J].农业装备与车辆工程,2013,51(5):5-67.
[5]庞剑,谌刚,何华.汽车噪声与振动[M].北京:北京理工大学出版社,2006.
[6]侯献军.发动机进气系统性能仿真及降噪优化[J].噪声与振动控制,2011,31(5):42-45.
[7]张洪武.某乘用车进气系统对车内NVH性能贡献研究及改进[D].长春:吉林大学,2012.
[8]石岩.汽车进气系统噪声仿真分析及优化[J].噪声与振动控制,2012,32(3):129-132.