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井下用锚杆钻车风机除尘系统服役一定周期后噪声恶化,为找出噪声恶化原因,将消声器进行拆解,发现消声器内部穿孔管部分堵塞,多孔吸声材料被煤尘污染。构建消声器声学有限元模型,计算穿孔管被煤尘完全堵塞、部分堵塞及正常使用下消声器传声损失,并初步探讨吸声材料污染对消声器传声损失的影响。仿真结果表明穿孔管堵塞是造成消声器消声性能下降及除尘系统噪声恶化的主要原因,说明要想保证除尘系统噪声水平需要提高除尘系统除尘能力,避免消声器污染。
In order to find out the cause of noise deterioration, the muffler was disassembled and found that the perforated pipe inside the muffler was partially blocked, and the porous sound-absorbing material was contaminated with coal dust. Acoustics finite element model of muffler was constructed. The perforated pipe was completely blocked by coal dust, partly clogged and muffler under normal use. The influence of sound-absorbing material pollution on the sound transmission loss of muffler was also discussed. The simulation results show that the blockage of the perforated pipe is the main reason that causes the muffler muffler performance degradation and the noise of the dust removal system to deteriorate. This shows that in order to ensure the noise level of the dust removal system, the dust removal capability of the dust removal system needs to be improved and the muffler pollution avoided.