Research on influence of underground coal dust concentration and humidity on electromagnetic waves transmissio
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摘要: 为了提高井下无线通信质量，保障有效通信，研究了井下煤尘浓度和湿度对电磁波传输的影响。通过理论分析给出了煤尘和水蒸气对井下电磁波的吸收计算公式，并得出煤尘的吸收效应是影响井下无线通信能力的主要因素。通过仿真分析了不同浓度、湿度与频率下的电磁损耗，得出煤尘浓度对电磁波传输的影响很明显，湿度对电磁波衰减的影响明显小于煤尘浓度。在此基础上，针对不同距离、不同煤尘浓度及不同湿度环境，在井下巷道中测试了点对点无线通信模块的数据传输性能。测试结果表明，在50 m以内，所有通信测试结果稳定，没有掉包现象；当距离达到100 m、煤尘浓度超过60 mg/m3时，开始出现掉包现象，且随着煤尘浓度增大，掉包现象加剧；湿度变化对掉包基本没有影响，但湿度较大时，数据传输正确率下降。Abstract: In order to improve quality of underground wireless communication and ensure effective communication, influence of underground coal dust concentration and humidity on electromagnetic wave transmission was researched. Calculation formula of electromagnetic waves absorption of coal dust and water vapor were given through theoretical analysis, and it was concluded that coal dust absorption effect was the main factor affecting underground wireless communication capability. Electromagnetic losses at different coal dust concentrations, humidity and frequency were analyzed by simulation, and it was concluded that coal dust concentration had obvious influence on electromagnetic wave transmission, and the influence of humidity on electromagnetic wave attenuation was obviously less than that of coal dust. On this basis, data transmission performance of point—to—point wireless communication module was tested in underground roadway for different distances, different coal dust concentrations and different humidity environments. The test results show that within 50 m, all communication test results are stable and there is no packet loss; when distance reaches 100 m and the coal dust concentration exceeds 60 mg/m3, packet loss phenomenon begins to occur, and as coal dust concentration increases, the package lost phenomenon intensifies; humidity change has no effect on packet loss, but data transmission accuracy rate decreases when the humidity is high.
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