内燃机工程2017，Vol.38Issue(2)：135-140,6.DOI:10.13949/j.cnki.nrjgc.2017.02.024
穿孔引气管声学特性矩形脉冲法模拟及试验
Rectangular-Pulse Method Based on Simulation and Experiment of Acoustic Performance of Perforated Intake Pipe
摘要
Abstract
A rectangular pulse approach based on the CFD was proposed for simulating the acoustic performance of a muffling structure.First, the transmission loss of a single-cavity perforated element was calculated neglecting airflow, and the influence of each structure parameter on the acoustic performance was researched respectively.Then, the transmission loss of a perforated intake pipe without airflow was obtained by the rectangular pulse approach and was compared with its FEM result to verify the validation.After that, the effect of mean flow on the transmission loss of the perforated intake pipe was achieved as well, revealing that reversing airflow makes the position of the peak transmission loss move slightly to the direction of low frequency with irregular change in the amplitude.Finally, a road test for an engine equipped with such perforated intake pipe was carried out.The result indicates that the intake sound pressure level (SPL) reduces apparently either at normal acceleration or emergency acceleration, especially in the frequency range of 500 to 1600Hz viewed in 1/3 octave spectrum, the SPL of snuffling noise reduces by almost 18dB(A), and the overall SPL by more than 10.3dB(A).Such perforated intake pipe has been proved to be excellent in improving the acoustic performance of an intake system.关键词
内燃机/穿孔引气管/矩形脉冲法/传递损失/平均流/道路试验Key words
IC engine/perforated intake pipe/rectangular pulse approach/transmission lost/mean flow/road test分类
能源科技引用本文复制引用
李恒,郝志勇,郑旭,刘联鋆..穿孔引气管声学特性矩形脉冲法模拟及试验[J].内燃机工程,2017,38(2):135-140,6.基金项目
"十二五"国家科技支撑计划重点项目(2011BAE22B05) （2011BAE22B05）
