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Based on cost data of certain zone history power transmission line projects, applying data mining technology including relative analysis, clustering analysis and support vector machine theory, one kind of new cost forecast methods of power projects is presented. Firstly, applying relative analysis and partial correlation analysis in SPSS15.0 software package, cost forecast index system is built after...
Traditional mesh-based methods achieve poor eigenvalue accuracy at high order modes in waveguide. A meshless method based on radial basis function was introduced to settle such issue. Collocation principles of RBF coupled with polynomials were expounded. Ideas on how to solve eigenvalue problems with RBF were presented and corresponding discrete equations were founded. Numerical experiments on rectangle,...
Element free Galerkin method (EFGM) is hard to handle the boundary and interface conditions. The paper treated these conditions by using visibility criterion and an alterative Lagrange multipliers technique. This proposed method avoids using interpolation basis function comparing the traditional Lagrange multipliers method, and is more comfortable to deal with complex boundary condition or three-dimensional...
The effect on the printed circuit board terminator load caused by electromagnetic radiation via two wires penetrated a shield enclosure is discussed in this paper. The results indicate that the electromagnetic pulse coupling via penetration wires make the voltage at terminal load of printed circuit board in shield enclosure increase more than that of with no wires. Besides the influence mentioned...
Prediction of electronic equipments and systemspsila Electromagnetic Compatibility (EMC) issues at early develop stages is inevitable for achieving their EMC discipline. This paper proposes a method to fast predict EMC problems based on Artificial Neural Networks (ANN). By means of choosing relevant Electromagnetic Interference parameters to compose of input prediction features, using the back propagation...
The EM radiation and the shielding of PIFA of cellular phone to human head are studied by using the method of finite-difference time-domain (FDTD) In this paper. By compare the results of electric field distribution and special absorption rate (SAR) in the head model with two different shield settings, we know that the electric field and SAR distribution in the head model decreased obviously after...
A method to calculate power frequency electrical field considering the charges caused by corona discharge around EHV (Extra-High Voltage) AC (Alternating Current) transmission lines is presented in this paper. The corona occurs when the electrical field intensity in the vicinity of the transmission lines exceeds the critical breakdown strength of air. To research the corona influence on the power...
Ignition system is the critical electromagnetic interference (EMI) source in automotive, the conducted EMI caused by the transient voltage of primary circuit will attack the accumulator and interfere the ECU or other electronic devices by power cord; The high frequency spark noise caused by spark plug broken down will produce. In this paper, the changing of ignition coil voltage and current is analyzed...
This paper presents a model for computing power frequency electromagnetic field of overhead high voltage transmission line based on simulation charge method. Based on this model, the electric field intensity under power line is calculated and the distribution is analyzed in different condition such as different distant between phase line, different phase order for double circuit, and different arrangement...
With the development of electricity markets, there are more and more attentions to the theory and applications of tracing power flow (TPF). But the relevant researches are mainly focused on the models and algorithms of TPF. There are few of studies on the curve of TPF(CTPF) considering the changes of operation states. From the results of TPF, the data sets of load extraction from generator and generation...
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