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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。
In order to study the propagation of noise generated by the local ventilator in the straight tunnel with different wall roughness, FBYNo3.0 / 2.2 (II) mine explosion-proof press-in axial local ventilator was used as the noise source, Pipeline noise propagation test device to carry out the pipe wall roughness under the state of the analog noise propagation test. The experimental results show that during the process of noise propagation, the noise intensity and noise frequency are inverted “V”, which is affected by the damping and diffusion of the rough pipe. The noise intensity decreases with the increase of the pipe length-diameter ratio For pipes with different inner wall roughness, the greater the roughness, the faster the noise decays during propagation. In the same roughness pipe, the attenuation rate of low frequency and high frequency noise is faster than that of intermediate frequency noise.