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对局部通风机的结构和噪声来源进行了分析,并在煤矿综掘工作面进行了噪声谱测量实验,发现其噪声超标。优选微穿孔板作为吸声材料,设计了吸收频率为500~4 000 Hz,吸声系数不小于0.4的微孔板吸声结构,将其加入局部通风机,再次进行了噪声谱测量实验。实验结果表明,所有频段的噪声均有不同程度地降低,中高频噪声得到了有效地控制,符合《煤矿安全规程》规定的噪声标准,证明了微孔板吸声结构的降噪效果和实际可应用性。
The structure and noise sources of the local ventilator were analyzed, and the noise spectrum measurement experiment was carried out on the fully mechanized coal mining face and it was found that the noise was excessive. The micro-perforated plate is preferably used as sound-absorbing material, and a microporous sound-absorbing structure with an absorption frequency of 500-4000 Hz and a sound absorption coefficient of not less than 0.4 is designed and added to a local ventilator for noise spectrum measurement again. The experimental results show that the noise in all frequency bands is reduced to some extent, the medium and high frequency noise is effectively controlled, and the noise standard stipulated in “Coal Mine Safety Regulations” is verified, and the noise reduction effect of microporous sound-absorbing structure and the actual Applicability.