李晓奂,杨维. 基于密绕小直径线圈的磁感应透地无线起爆系统性能分析[J]. 电波科学学报,2024,39(3):1-10. DOI: 10.12265/j.cjors.2023213
      引用本文: 李晓奂,杨维. 基于密绕小直径线圈的磁感应透地无线起爆系统性能分析[J]. 电波科学学报,2024,39(3):1-10. DOI: 10.12265/j.cjors.2023213
      LI X H, YANG W. Analysis on performance of magnetic induction-based through-the-earth wireless initiation system using close wound small diameter coils[J]. Chinese journal of radio science,2024,39(3):1-10. (in Chinese). DOI: 10.12265/j.cjors.2023213
      Citation: LI X H, YANG W. Analysis on performance of magnetic induction-based through-the-earth wireless initiation system using close wound small diameter coils[J]. Chinese journal of radio science,2024,39(3):1-10. (in Chinese). DOI: 10.12265/j.cjors.2023213

      基于密绕小直径线圈的磁感应透地无线起爆系统性能分析

      Analysis on performance of magnetic induction-based through-the-earth wireless initiation system using close wound small diameter coils

      • 摘要: 为了在矿区开采时实现安全便携的透地无线起爆,提出了地上发射端采用密绕小直径线圈的磁感应透地无线起爆方案,并建立了地面发射线圈与地下接收线圈等效耦合电路分析模型,推导了地下接收端负载的电压表达式,用地面发射线圈与地下接收线圈间的互感系数表征了收发线圈间耦合强度的大小。由于地面发射线圈与地下接收线圈间的相对位置关系不是平行共轴,传统基于平行且共轴线圈的互感公式不再适用,本文从磁矢位出发推导出了考虑涡流效应的具有一般位置关系的单匝圆线圈间互感系数的通用表达式。由于地面发射线圈采用横放模式存在爆破盲区,地面发射线圈应采用竖放模式。基于负载电压公式分析了发射线圈半径与匝数、发射信号频率和垂直透地深度对透地起爆系统地下接收端负载电压和水平覆盖距离的影响。仿真结果表明:发射线圈采用竖放模式的透地无线起爆系统的水平覆盖距离可达到200~300 m;随着透地深度的增加,系统的水平覆盖距离逐渐降低,但可以通过适当增加发射线圈半径和匝数、降低发射信号频率的方式提高透地无线起爆系统的水平覆盖距离,以满足在不同规模矿区开采应用场景下的透地无线起爆需求。

         

        Abstract: In order to realize safe and portable through-the-earth (TTE) wireless initiation in the mining areas, a scheme based on magnetic induction (MI) of TTE wireless initiation with small diameter coils at the ground transmitter is proposed, and the equivalent coupled circuit analysis model of the transmitting coils on the ground and the receiving coils underground is established. Based on the established coupled circuit analysis model, the voltage expression of underground receiving terminal load is derived. In the expression, the mutual inductance coefficient between the transmitting coils on the ground and the receiving coils underground represents the coupling strength between the transmitting and receiving coils. Since the relative position relationship between the transmitting coils on the ground and the receiving coils underground is not parallel or coaxial, the traditional mutual inductance formula based on parallel and coaxial coils is no longer applicable. Therefore, the general expression of mutual inductance coefficient between single-turn circular coils with general positional relationship considering eddy current effect is derived from magnetic vector position. The simulation results of mutual inductance coefficient show that there is a blasting blind zone when the transmitting coils on the ground are placed horizontally, so it can be determined that the transmitting coils on the ground should be placed vertically. According to the load voltage formula, the influences of the radius and turns of the transmitting coils, the frequency of the transmitting signal and the vertical penetration depth on the load voltage and horizontal coverage distance of the underground receiving terminal of the TTE initiation system are simulated and analyzed. The simulation results show that, the horizontal coverage distance of the TTE wireless initiation system with transmission coils used vertical mode can reach 200−300 m. With the increase of the depth of penetration, the horizontal coverage distance of the system gradually decreases. However, the horizontal coverage distance of the TTE wireless initiation system can be improved by appropriately increasing the radius and turns of the transmission coils and reducing the signal frequency to meet the requirements of TTE wireless initiation in mining application scenarios of different scale mining areas.

         

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