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The characteristics of arc in DC contactors are a major factor affecting the breaking performance of small-sized contactors. Based on the magneto hydrodynamics (MHD) model, this paper obtains the temporal and spatial distribution of arc temperature by taking DC arc as its research objective and H2, N2 and He as arc extinguishing media. A removable arc chamber was adopted to build up a DC experimental...
Analysis of network traffic behavior and modeling to predict, for network management and security early warning has a very important significance. An improved FOA-ESN method using opposition-based learning (OBL) mechanism for the network traffic prediction with multiple steps is proposed in this paper. Firstly, reconstructing the phase space of the original network flow time series, and then building...
In this paper, a high-efficient and viable energy management strategy for PEMFC-battery hybrid system is proposed to coordinate different power sources according to their natural characteristics. It is also used to avoid rapid and frequent fluctuation of PEMFC output power to get a high efficiency and long service time of hybrid system. The developed system is composed of high-power polymer electrolyte...
There are two ways to improve the D-S evidence theory, the methods based on modification for Dempster rule, and the methods based on modification for original evidence sources. For modification of evidence sources, there are mainly two methods: discounting factor method and weighted average method. Although the weighted average method has better focusing degree, it ignores conflicting degree of combination...
In this paper, a 72.5kV vacuum arc extinguishment chamber is studied through establishing 3D field domain models based on the structures of 1/2 and 1/3 turn coil longitudinal magnetic field contacts with different numbers of slots, at the same time, 3D static simulation and eddy current field simulation were conducted using the finite element method and physical environment method to analyze the influence...
To study the influential degree of energy consumption influential factors impacting on energy consumption is the foundation of reducing energy consumption and saving energy. Energy consumption intensity influential factors decomposition is a class method of measuring the influential degree of energy consumption intensity influential factors impacting on energy consumption intensity. So the research...
The transport of an elliptic sheet electron beam with uniform density in uniform magnetic field is investigated by making use of a macroscopic cold-fluid model. General envelope equations and beam twisted angles are derived. In particular, the tilt of the elliptic sheet beam was numerically calculated by an example of W-band sheet beam klystron.
Based on the N-S and Maxwell equation, a mathematical model describing the arc behavior in SF6 circuit breaker (CB) has been deduced. The effect of Lorentz force, turbulent and physical parameters on the characteristic of arc plasma was considered in the model. Using the finite volume method, the distributions of controlling parameters for arc in SF6 circuit breaker, such as viscosity, electric conductivity,...
In this paper, the ponderomotive focusing forces are derived for a sheet electron beam in both periodic cusped magnetic and wiggler magnetic field configurations, which has a large aspect ratio, using two-time scale analytical method.
The diocotron instability of a relativistic sheet electron beam propagating through a uniform magnetic field is studied using a macroscopic cold fluid model. The general eigenvalue equation is obtained for low-frequency perturbations. In the limit of a long axial wavelength, a dispersion relation is derived for the special case of a sharp boundary density profile and used to study stability properties...
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