摘要
发动机进气系统设计除了满足进气和空气滤清要求外,通常还要求能够有效地降低进气噪声。设计消声效果良好的空气滤清器是控制发动机进气噪声的有效措施之一。由于一维平面波理论只适于低频分析,为了扩大分析的频率范围,采用了三维有限元数值方法分析空气滤清器的声学特性。同时,空气滤清器中的滤纸大多是纤维材料,可以作为吸声材料来处理,所以在考虑滤纸的情况下分析空气滤清器的消声性能,其中以纤维吸声材料的经验公式来模拟滤纸的声学特性。通过比较不带滤纸和带有滤纸的空气滤清器的声学性能结果表明,滤纸的考虑与否对空滤器的中高频消声性能有很大影响。
Besides of the functions of channeling fresh air to the engine efficiently and filtering particulates from the air, the air cleaner should be able to reduce the intake noise effectively. Designing air cleaner with good performance of noise reduction is one of the effective ways for the intake noise control. In view of that the plane wave theory is suitable only in lower frequency range, the three-dimensional finite element method is applied to analyze the acoustic characteristics of air cleaner in the present study for broadening the frequency range. Considering the filter paper as the sound-absorbing material, the filter paper is then taken into account in the analysis of the air cleaner, in which the acoustic characteristics of the filter paper is modeled with the empirical expressions of fibrous materials. Comparisons between the acoustic performances of the air cleaners with and without filter paper illustrated that the acoustic attenuntion performance has been improved due to the existence of filter paper.
出处
《噪声与振动控制》
CSCD
北大核心
2007年第2期55-58,共4页
Noise and Vibration Control
关键词
声学
空气滤清器
进气消声
滤纸
有限元分析
acoustics
air cleaner
intake noise reduction
filter paper
finite element method
