利用有限元法研究催化转化器的声学特性  

A Study on Sound Propagation of Catalytic Converters Using FEM

作　　者：吕吉平[1] 刘国军[1] 

机构地区：[1]青岛酒店管理职业技术学院,山东青岛266100

出　　处：《内燃机与动力装置》2008年第3期25-28,共4页Internal Combustion Engine & Powerplant

摘　　要：利用方形微孔内声传播的等效复密度和等效复声速,推导出催化转化器载体内声传播的等效声波方程,并将催化转化器载体的等效声波方程和载体前后管道内的声波方程耦合起来,然后利用声学有限元法求解催化转化器的传递损失。通过计算分析发现,催化转化器载体提高了中高频衰减量,提高温度也能增加中高频衰减量,而孔隙率对低频和高频的作用正好相反。Acoustic wave propagation and attenuation in catalytic converters are investigated in the present study. First, equivalent complex density and complex sound velocity were used to create the wave propagation equation which was solved by using acoustic FEM. Theoretical analysis predict that monolith substrates increase the attenuation in the high frequency area, high temperature also increases the attenuation in the high frequency area, and porosity have opposite effect on the low frequency and high frequency area.

关 键 词：催化转化器 声学有限元 传递损失 复密度 复声速 

分 类 号：TK411.6[动力工程及工程热物理—动力机械及工程]