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弓网系统电磁噪声不但危害行车安全,而且对铁路沿线的通讯和周边居民的健康产生不利影响。通过研究弓网电磁噪声的辐射特性,为抑制其辐射强度提供理论基础。建立了弓网系统离线电弧的Matlab仿真模型,通过仿真得出电弧的放电特性和频谱范围。利用有限元分析软件对弓网电弧放电的典型频率进行仿真分析,得出弓网电弧的典型频率的远场和近场特性。仿真结果表明:弓网离线电弧的主要频段为30~100 MHz,这个范围内电磁辐射的幅度相对严重。另外由于受到受电弓以及滑板的影响,电弧的辐射场不对称,不同方向上辐射的场强均不同,车厢的前端和尾端是主要的辐射方向。
Magnet network noise not only endanger traffic safety, but also adversely affect the communication along the railway and the health of the surrounding residents. By studying the radiation characteristics of bow network electromagnetic noise, it provides a theoretical basis for suppressing its radiation intensity. The simulation model of off-line arc in bow-net system was established, and the discharge characteristics and spectrum range of the arc were obtained through simulation. The finite element analysis software was used to simulate the typical frequency of arch arcing, and the far-field and near-field characteristics of the typical frequency of bow arc were obtained. The simulation results show that the main frequency band of arc off-line arc is 30 ~ 100 MHz, the amplitude of electromagnetic radiation is relatively serious in this range. In addition, due to the influence of the pantograph and the skateboard, the radiation field of the arc is asymmetrical, and the radiation field strengths in different directions are different. The front and rear of the cabin are the main radiation directions.