摘要
排查、分析、解决燃料电池客车停车吹扫时的排气口啸叫问题。采用进排气引出和管路包裹方式,分析燃料电池空气子系统各零件的噪声贡献度。利用声模态法分析啸叫声机理,发现2568 Hz抱怨原因为高速气流引起的赫尔姆兹声腔模态。设计新的消声器方案,通过测量传递损失,对新方案消声器进行声学性能评估。结果显示,1/3倍频段2500 Hz声压级可增加22 dB。结合整车验证和主观评价,啸叫消除,证明所提方案可行。
This article investigates,analyzes and solves the problem of exhaust whistling when the fuel cell bus stops for purging.Noise contribution of air subsystem is checked by intake and exhaust system extraction and duct acoustic package.Acoustic mode is applied to analyze the whistling phenomenon,the root cause of 2568 Hz complaint is Helmoltz cavity mode generated by high velocity airflow.Acoustic performance of new design muffler is evaluated by transmission loss,one-third octave band at 2500 Hz increase 22 dB.Combined with vehicle test and subjective evaluation,whistling noise disappears and the design case is feasible.
作者
张巍
ZHANG Wei(Shanghai Re-fire Technology Ltd.,Shanghai 201812,China)
出处
《电声技术》
2021年第1期4-9,共6页
Audio Engineering
