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对风机气动噪声的产生机理及影响因素进行了系统的理论分析：（１）分析计算了风机噪声频谱中突出的峰包噪声的产生机理及频率分布特性；（２）对连续语随机嗓声的产生机理进行了理论分析和计算机模拟验证；（３）计算出风机旋转噪声与风机结构及叶道流型之间的关系，分析结果为该类型风机的噪声控制提供了可靠的理论依据和明确的降噪原则．通过大量实验及优化，研制出一套独特的整流丝网和导流吸声相结合的离心风机降噪措施，使风机噪声Ａ声级由７７．２ｄＢ（Ａ）下降到７１．２ｄＢ（Ａ），全压损失为７．３％，风机比Ａ声级由１６．８ｄＢ（Ａ）下降到１１．５ｄＢ（Ａ）．
(1) Analyzed and calculated the mechanism and frequency distribution of the prominent peak noise in the noise spectrum of the fan; (2) Analyzed the mechanism of the generation of the random noise of the continuous noise (3) Calculating the relationship between the fan rotating noise and the fan structure and the flow pattern of the runner, the analysis results provide a reliable theoretical basis for the noise control of this type of fan and a clear Noise reduction principle. Through a large number of experiments and optimization, a set of unique noise reduction measures of centrifugal fan combining rectification screen with diversion and absorption was developed to reduce A level of fan noise from 77.2dB (A) to 71.2dB (A) , The total pressure loss is 7.3%, and the fan A sound level is reduced from 16.8dB (A) to 11.5dB (A).