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我厂缸体和中小件造型线各由一对冲天炉配套,它们都设有一个鼓风机房,内装两台LG—80—3500型罗茨鼓风机,房内噪声来自进风口、出风口空气动力性噪声;风机8字形转子处旋转噪声和涡流噪声;其次,机械震动和电机电磁噪声。经现场测试,机房内噪声频谱如图1所示。频带宽,频率低,传播远,过去未曾采取措施,这两处机房噪声高达103~107分贝,恶
I plant the cylinder and small pieces of modeling line by a pair of cupola matching, they are equipped with a blower room, built two LG-80-3500 Roots blower, room noise from the inlet, the outlet aerodynamic Noise; Rotating noise and vortex noise at fan 8-shaped rotor; Second, mechanical vibration and motor electromagnetic noise. The field test, the engine room noise spectrum shown in Figure 1. Frequency bandwidth, low frequency, spread far, in the past have not taken measures, the two rooms noise up to 103 ~ 107 dB, evil