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掘进工作面悬浮粉尘颗粒改变巷道空气的粘滞特性,同时产生声波散射而影响机器噪声的传播与衰减,简要介绍了粉尘空气介质的声波衰减机理,基于掘进工作面及近巷道粉尘分布特性,分析了悬浮粉尘空气介质的粘滞特性对声衰减的贡献,研究了悬浮粉尘颗粒的声波散射作用及粉尘颗粒粒径、浓度等对声散射衰减的影响,研究表明:巷道中扩散声衰减与介质粘滞声吸收衰减两者在衰减量级上相当,而声散射衰减相对很小甚至可以忽略不计;粉尘浓度是影响粘滞声吸收的主要因素,而粉尘颗粒粒径、粉尘浓度等对声散射衰减有一定影响.
At the same time, the sound wave scattering affects the transmission and attenuation of machine noise. The mechanism of sound attenuation of dust air medium is briefly introduced. Based on the analysis of the distribution of dust in the working face and near roadway, The contribution of the airborne viscous property of suspended dust to acoustic attenuation was studied. The effects of the sonic scattering of suspended dust particles and the particle size and concentration of dust particles on the attenuation of acoustic scattering were studied. The attenuation of acoustic absorption is equivalent to that of attenuation, while the attenuation of acoustic scattering is relatively small or even negligible. The concentration of dust is the main factor that affects the absorption of viscous acoustic waves. The attenuation of acoustic scattering due to particle size, dust concentration, Have a certain influence.