A Method for Studying Electromagnetic Wave Propagation in Semicircular Arch Tunnel

Abstract

The invention discloses a method for research on electromagnetic wave propagation in a semicircular arched tunnel, which can quickly calculate attenuation rate of electromagnetic wave propagation in the semicircular arched tunnel. The method comprises the following steps of: measuring width and height of the semicircular arched tunnel; calculating area and shape factors of the semicircular arched tunnel; making the semicircular arched tunnel equivalent to a rectangular tunnel according to an equivalent method of equal area and equal shape factors involved in the patent of the invention; and executing calculation according to a electromagnetic wave attenuation rate model of the rectangular tunnel. As compared with several other methods, the method involved in the invention has lower error, can easily calculate electromagnetic wave attenuation rate, and so on, of the semicircular arched tunnel unmatched with an orthogonal coordinate system. Rapid low-error calculation is realized. The method of the invention realizes equivalent transformation of the semicircular arched tunnel unmatched with the orthogonal coordinate system, with the rectangular tunnel; the method reduces errors generated by calculation to a certain degree, calculates more conveniently and simply, and reduces complexity in research on electromagnetic wave attenuation in the tunnel of a shape unmatched with the orthogonal coordinate system; and the method has the advantages of calculating conveniently, being easy to understand and generating low error, and can be effectively used for wireless communication in the tunnel of a shape unmatched with the orthogonal coordinate system.

Description

technical field [0001] The invention relates to a method for studying electromagnetic wave propagation in tunnels, in particular to a method suitable for studying electromagnetic wave propagation in semicircular arched tunnels. Background technique [0002] Coal is the main energy source in my country, accounting for about 70% of the primary energy structure. For a long period of time in the future, the status of coal as the main energy source will not change. The coal industry is an important foundation for the country's economic lifeline and energy security. In my country, due to the limitation of geological conditions, coal mining is mainly based on underground mining. Underground coal mines are composed of various criss-cross tunnels with different shapes and lengths, and their length can reach tens to hundreds of kilometers. Requirements, information transmission has become an important constraint that cannot be ignored. [0003] However, the cross-sectional shape of ...

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Problems solved by technology

These shapes do not conform to the orthogonal coordinate system, and the boundaries inside and outside the roadway cannot conform to the coordinate plane. As a result, the variables in the Helmholtz equation established according to the Maxwell equations cannot be separated, and the accurate analytical solution of the electric field or magnetic field cannot be obtained. Therefore, It is difficult to use classical theoretical methods and mathematical tools to analyze and study the properties of electromagnetic wave propagation in these shaped tunnels

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