摘要
利用Sysnoise软件对一汽车消声器进行声场计算,得到消声器的声压分布和传递损失曲线;对消声器结构进行改进,在其内部增设一块隔板和两个穿孔管,并对改进结构进行数值计算。结果表明:低频时声波以平面波的形式向前传播,高频时声波主要以高次谐波的形式向前传播。与原始消声器相比,在600-1 200 Hz的中低频段,以及1 700-1 800 Hz,2 700-2 800 Hz的中高频段,改进消声器的传递损失提高20 dB以上;且在20-3 000 Hz总频段,改进消声器的传递损失平均提高19.8 dB。故改进消声器的消声效果良好。
Exhaust muffler＇s sound field is calculated with Sysnoise software.Sound pressure distribution and transmission loss plot are obtained.Noise elimination structure is improved,and a diaphragm and two perforated pipes are set inside the muffler.The results show that the acoustic wave with low frequency propagates in a form of plane wave,while acoustic wave with high frequency propagates in a form of high-order harmonic wave.Compared with the original muffler,the improved muffler＇s transmission loss increases by more than 20 dB in 600-1200 Hz,1700-1800 Hz and 2700-2800 Hz frequency ranges.And the improved muffler＇s transmission loss increases by 19.8 dB in average in 20-3000 Hz frequency range.Thus,the improved muffler＇s noise elimination effect is good.
出处
《噪声与振动控制》
CSCD
北大核心
2011年第2期59-62,共4页
Noise and Vibration Control
关键词
声学
消声器
声场
数值模拟
结构改进
传递损失
acoustics
exhaust muffler
sound field
numerical simulation
structure improvement
transmission loss
