煤矿掘进工作面不同声源位置下声场分布

煤矿掘进工作面噪声污染严重,影响井下作业人员身心健康与安全生产。为了解噪声源位置改变时煤矿掘进工作面声场分布情况,基于煤矿实例建立掘进工作面物理数学模型,采用数值模拟和实验验证相结合的方法,分析噪声分布特征及噪声源位置变化对声场的影响。研究结果表明：噪声源靠近壁面或地面时,工作面内声场分布较紊乱,产生的高噪声区域较广,不利于工作面的噪声衰减;当两个噪声源的相对距离在10 m以内时,声压级衰减曲线呈“W”型,当两声源相对距离超过10 m时,声压级衰减曲线呈“M”型;实验测试与数值模拟结果基本一致,验证了搭建的模型及模拟结果的可靠性。研究结果可为煤矿掘进工作面环境噪声的预测与控制提供了依据。

Study on the sound field distribution under different sound source positions in coal mine excavation working face

The noise pollution at the coal mine excavation working face is serious and affects the physical and mental health of underground workers and safe production. In order to understand the distribution of sound field in the working face of coal mine excavation when the location of noise source changes, based on a coal mine example, a physical and mathematical model of the heading face is established. The characteristics of noise distribution and the influence of the change of noise source location on the sound field are analyzed by the method of numerical simulation and experimental verification. The research results show that: when the noise source is close to the wall or the ground, the sound field distribution in the working face is more disorderly and the high noise area is wider, which is not conducive to the noise attenuation in the working face; when the relative distance between two noise sources is within 10 m, the sound pressure level attenuation curve is "W" type, when the relative distance between two sources exceeds 10 m, the sound pressure level attenuation curve is "M" type. The attenuation curve is "M" type; The results of experimental test and numerical simulation are basically consistent, which verifies the reliability of the model and simulation results. The results provide a certain basis for the prediction and control of environmental noise at the coal mine excavation working face.