变截式宽频消声技术应用研究  

Study on variable cross section and broadband noise reduction technology

作　　者：张弛[1] 徐南[2] 

机构地区：[1]江苏建筑职业技术学院建筑设备与市政工程学院,江苏徐州221116 [2]江苏建筑职业技术学院建筑工程管理学院,江苏徐州221116

出　　处：《江苏建筑职业技术学院学报》2016年第2期6-9,12,共5页Journal Of Jiangsu Vocational Institute of Architectural Technology

基　　金：江苏省高校高新技术产业发展项目:煤矿主扇风机噪声控制技术应用(JHZD05-015)

摘　　要：阻性消声结构对中、高频噪声有良好的消声性能,低频噪声消声效果较差,为了突破阻性消声结构在低频段消声不良的技术难点,通过改变阻性消声体的结构,利用消声体的厚度由薄变厚和由厚变薄的特殊形式,将消声体按照一定方式进行组合,使消声通道收缩和扩张,并衍生出抗性消声结构,改变声波在消声通道的传播途径,增强声波在消声通道内的磨擦、粘滞、涡流和反射作用,增大低频噪声的消声量,拓宽消声频带,优化空气动力性能等.Resistive muffler structure has good muffler performance on high-frequency noise, but on the low frequency noise, silencing efficiency is poor. In order to break through the technical difficulties that the resistive muffler structure has poor effect in low-frequency, the resistance muffler structure is crea- ted, by changing the structure of silencing body, using the thickness variation of the muffler body, combining the silencing body In a certain way, making the contraction and expansion of the noise chan- nel. At the same time, the acoustic wave propagation in the way of the noise channel is changed, the a- coustic friction, viscous, eddy current and reflection in an anechoic channel are enhanced, attenuation of the low-frequency noise is increased, the muffling frequency hands is broaden, and aerodynamic per- formance is optimized.

关 键 词：消声结构 渐变截面 宽频降噪 技术应用 

分 类 号：TB535[理学—物理]