摘要
随着整车竞争的日益激烈,用户对排气噪声提出了更高的要求,针对已实施的道路国六和非道路四阶段排放,控制排气噪声最有效的方法是提升后处理的消声能力。本文以常用的筒式后处理为研究对象,通过仿真计算识别筒式后处理声学影响的关键因素,提供了一种筒式后处理排气噪声的优化设计和匹配思路。仿真结果表明:低频传递损失的提升需加大进口/出口的扩张比、加长筒体长度或缩短璧流式载体长度。高频传递损失的提升需加长筒体长度、加长载体长度、减小载体直径或者增加消声结构。
With the increasingly fierce competition of vehicle,users put forward higher requirements for exhaust noise.For implemented China road VI and non-road IV emissions,the most effective way to control exhaust noise is to improve the noise reduction ability of the post-processing unit.In this paper,the key factors of acoustic influence for a cylindrical post-processing unit are identified through simulation calculation,and an optimal design and matching way for exhaust noise of a cylindrical post-processing unit is provided.The simulation results show that the increase of low frequency transmission loss needs to increase of expansion ratio of inlet/outlet/mixer,increase the length of the post-processing unit,or shorten the length of wall-flow carrier.The increase of high frequency transmission loss needs to increase the expansion ratio of mixer,increase the length of the post-processing unit,increase the length of carrier,reduce the diameter of carrier or increase a silencing structure.
作者
吕绍瑜
王宪锰
陈琳
徐可鹏
闫利利
Lv Shao-yu;Wang Xian-meng;Chen Lin;Xu Ke-peng;Yan Li-li(Weichai Power Co.,Ltd.,Shandong Weifang 261061)
出处
《内燃机与配件》
2025年第17期21-23,共3页
Internal Combustion Engine & Parts
关键词
后处理
传递损失
关键因素
Post-processing
Transmission loss
Key factors
