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This paper simulates scattering properties of metasurfaces by finite difference time domain(FDTD) method with generalized sheet transition conditions (GSTCs) to alleviate computational burden. It is found that a metasurface can be represented by the electric and magnetic polarization densities, which is related to electromagnetic field by GSTCs. The GSTCs are thereby implemented in 3D FDTD codes and...
The load of metro cable system varies a lot from morning rush hours to the evening closure time. With many trains hopping in the rush hours, the long term and economical short term thermal stability become a big issue as a result of the large difference between thermal time constant and the electrical time constant of cable. Based on a 10kV three-core XLPE metro power cable model, the theoretical...
Aiming at the overheating problem of cable joint, a 3-D finite element model of a single-core cable joint considering the coupling of electromagnetic field and temperature field has been built. In order to consider the heat losses generated by contact resistance of cable joint, the equivalent conductivity is calculated. The validity of the model and calculation method is verified by the comparison...
Magnetic forces in large submersible tubular motors are generally caused by the strong magnetic fields in the air gap. Due to the large size of the machine, and the rather thin stator, the magnetic forces acting on the stator often make the stator deform in many practical projects. In order to figure out the deformation degree of the stator caused by the magnetic forces, this paper proposes a simplified...
Take the most widely used linear cylinder as research object, use the quality-alterable air's thermodynamics establish the mathematical model of cylinder impact process. Obtain the parameters of the pressure in rod chamber and rodless chamber through solving the differential equations in Simulink. Then simulate the cylinder impact process in Transient dynamic module of ANSYS. The simulation boundary...
In this paper, the characteristics of Reflectarray Antennas printed on convex curved surfaces are analyzed. In particular, results on the radiation performances of different Reflectarrays designed to be mounted on cylinders with different radii of curvature are presented and discussed.
Forced ventilation of cable tunnel is one of the important ways to improve the cable ampacity which is one of important parameters to guarantee safe and reliable operation of underground cable system. According to the theory of fluid dynamics and heat transfer, the 3-D physical and mathematical models of cable tunnel ventilation system for fluid and temperature analysis were established, which were...
A meander line UHF RFID tag antenna with an efficient matching network has been designed. Wideband matching and good radiation properties were achieved in parallel with small antenna size by increasing the structurepsilas electrical length by meander structure and thus lowering its self-resonant frequency. Antenna was modelled with a FEM-simulator and it showed good performance: matching for global...
Aiming at plane busbars with large current being generally used from indoor substation, the paper presented the calculational model for the power frequency magnetic field based on dimension and distributed structure factors and so on. Finite element method was used to calculating the magnetic inductive intensity in the space nearby the busbars so as to research shield efficiency. The paper emphasized...
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