随着社会主义建设事业的飞跃发展,在工矿企业、科研和建筑等单位,越来越广泛地使用通风机、鼓风机和压缩机(以下简称风机)等动力机械。风机在运转过程中,由于叶片的高速旋转,产生强烈的空气动力性噪声。这种噪声,通过进气口和排气口传播到周围的空间,严重地污染了周围的环境,使 With the rapid development of socialist construction, more and more power machines such as ventilators, blowers and compressors (hereinafter referred to as fans) are used in industrial and mining enterprises, scientific research and construction units. Fan in operation, due to the high-speed rotation of the blade, resulting in strong aerodynamic noise. This noise, which spreads to the surrounding space through the air intake and exhaust, severely contaminates the surrounding environment,