局部通风机噪声在不同壁面粗糙度平直巷道内的传播规律
Noise Propagation Law of Local Ventilator in Straight Roadway with Different Surface Roughness
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摘要: 为了研究局部通风机产生的噪声在不同壁面粗糙度平直掘进巷道中传播规律,采用FBYNo3.0/2.2(II)型矿用隔爆压入式轴流局部通风机作为噪声源，搭建平直管道内噪声传播试验装置，开展了管道内壁面粗糙度状态下噪声的模拟传播试验。试验结果表明，噪声传播过程中，噪声声强与噪声频率呈倒“V”字形，受到粗糙管道阻尼作用和扩散作用的共同影响，噪声声强随着管道长径比的增长而逐渐减小；对于不同内壁粗糙度的管道，粗糙度越大，噪声在传播过程中衰减的速率越快。在相同粗糙度管道中，低频和高频噪声的衰减速率比中频噪声的衰减速率快。Abstract: In order to figure out local fan noise propagation laws in different surface roughness straight excavating roadway, we adopt FBYNo3.0/2.2 (II) pushed mining flame-proof type axial flow local ventilator as noise source, setting up straight pipe noise propagation experiment device, we carry out noise transmission simulation experiments for several kinds of condition within different roadway of surface roughness. It turns out that in the process of noise transmission, the sound intensity noise and noise frequency present inverted "V" glyph, from the combined impact of rough pipe damping effect and diffusion effect, the noise sound intensity decreased with the increase of length to diameter ratio of pipe gradually; for different roughness of roadway inner wall, the more the roughness, the faster the noise in the process of transmission attenuation rate. In the same roughness of roadway, low frequency and high frequency noise attenuation rate is higher than medium frequency noise attenuation rate.
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Keywords:
- roughness /
- noise sound intensity /
- length-diameter ratio /
- noise frequency /
- noise propagation law
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