volume | PIER Journals

2021-11-02

Influence of Materials, Windows and Shielding Layers on Low-Frequency Electromagnetic Environment of Subway Vehicle and Human Exposure Research

Zhiyuan Wang,

Ms. Zhiyuan Wang

Xi'an University of Posts & Telecommunications

China

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Weinan Liu

Dr. Weinan Liu

Oregon State University

China

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Progress In Electromagnetics Research M, Vol. 105, 151-160, 2021

doi:10.2528/PIERM21080403

Abstract

The numerous high-power devices and cables gathered around the subway vehicle will aggravate the deterioration of the electromagnetic environment, which may cause the train to fail to operate normally or threaten the health of passengers with a pacemaker or defibrillator. In order to study the distribution characteristics of low-frequency magnetic field of the subway in complex electromagnetic environment and the influence of various factors on human electromagnetic exposure, the magnetic flux density nephograms of the subway train with different vehicle body materials, with or without windows and with the shielding layer are calculated and analyzed. Specific energy absorption rate (SAR) values have been calculated in a standing voxel model from exposure to electromagnetic fields at 2.4 GHz, frequencies commonly used by Wi-Fi devices. The numerical results show that the average value of magnetic flux density in the stainless-steel carriage is less than that in the aluminum alloy carriage and the carbon fiber reinforce plastic (CFRP) carriage. Compared with the vehicle with windows, the average value of magnetic flux density in the vehicle without windows is less. The added shielding layer decreases the average value of magnetic flux density from 10.5 uT to 3 uT. The maximum value of magnetic flux density in the carriage under different factors is about 10 uT, which is far less than the magnetic flux density reference limit of 0.1 mT of the International Commission of Non-Ionizing Radiation Protection (ICNIRP) standard. Whenthe Wi-Fi device is closest to the human body, the highest Specific Absorption Ratio (SAR) value of human tissue is 0.00749 W/kg, which is far less than the electromagnetic exposure limit of 1.6 W/kg of IEEE standard.

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Zhiyuan Wang, and Weinan Liu, "Influence of Materials, Windows and Shielding Layers on Low-Frequency Electromagnetic Environment of Subway Vehicle and Human Exposure Research," Progress In Electromagnetics Research M, Vol. 105, 151-160, 2021.
doi:10.2528/PIERM21080403

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