【摘要】 采用近声场声强识别法，对离心风机机壳作出了声强分布三维图。研制的双层微穿孔吸声器，以吸声系数α为目标函数进行优化设计，较好地解决了宽频率吸声。应用表明控制蜗壳声辐射的效果好，相对降噪率达４０％。更多还原

【Abstract】 In this paper the sound intensity identified method of near acoustic field was empoyed in three dimensional diagram of sound intensity distribution on centrifugal fan shell. The developed double-deck microperforated resonator which was optimiaed for taking sound absotption coefficient a as objective function solved effectively wide-band sound absorptioon. Its application shows that it is effective to control the noise radiation of fan shell and reduce noise by forty percent.更多还原