Abstract

Overview

This study delves into the effects of high-power devices and associated cabling on the electromagnetic environment around subway vehicles, which could disrupt normal operations or pose health threats to passengers with medical implants like pacemakers or defibrillators.

Findings

• Investigation of the low-frequency magnetic field distribution in subways under various scenarios including different vehicle materials, presence of windows, and shielding layers.
• Magnetic Flux Density: Observations show lower magnetic flux density in stainless-steel carriages compared to those made of aluminum alloy or carbon fiber reinforced plastic (CFRP).
• Effect of Windows: Carriages without windows exhibit lower magnetic flux density.
• Impact of Shielding: Addition of shielding layers reduced magnetic flux density from 10.5 μT to 3 μT.
• Specific Energy Absorption Rate (SAR): In scenarios where Wi-Fi devices are placed closest to a human, the highest SAR was 0.00749 W/kg, which is significantly below the IEEE exposure limit of 1.6 W/kg.

Conclusion

The research concludes that varying materials, the application of windows, and additional shielding layers can significantly influence the electromagnetic exposure in subway environments. Potential health risks, although within safe limits as per current standards, warrant careful monitoring and further research.