Study on the radio noise in coal mine

Abstract：Analyzed the method of predicting noise coefficient in the underground mine.According to the characteristics of power supply in the underground coal mine,proposed the method of obtaining the environment noise coefficient by measuring the electric field intensity,and of getting the predicting equation of noise coefficient in the different tunnels.The results show that the power line in the underground has basically no effect on the noise coefficient.The influence of frequency change on the noise coefficient at the empty tunnel and the tunnel which was only placed cable in are almost the same.It has smaller effect on the noise coefficient when the battery locomotive passing through the tunnel.The noise coefficient of frequency-converter waves ups and downs sharply,and comparing with other curves the attenuation change slowly.The trolley have a great effect on the environment noise coefficient,and the noise coefficient will go ups and downs sharply when the trolley running.