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A new method for small signal stability analysis of large-scale power system is presented in this paper. The task of the eigenvalue analysis method which is the most common method used in the small signal stability analysis is to obtain the eigenvalue of the state matrix. However, it is very difficulty for the exiting mathematic method to solve the eigenvalue of the studied system when the orders...
The deep foundation fit of Xin Ming He building was reinforced by soil nail, shot concrete and steel bar mesh, and the calculated pressure per unit area of soil nail is about 83.48kN which is larger than the largest lateral earth pressure which is about 59.55kN, from which it can be known that the foundation fit is stable. Meanwhile, the 3D-σ finite element program was used to simulate axial force...
A weakly conditionally stable (WCS) finite-different time-domain (FDTD) algorithm is presented for resonant cavity analysis. The time-step in the WCS-FDTD is based on the largest cell size. And compared with the alternating-direction implicit (ADI) FDTD, the WCS-FDTD method is of higher accuracy and efficiency. Numerical results indicate that the CPU time for the WCS-FDTD method can reduced to about...
In this paper, one kind of subgrid techniques using physical connection between the main grid and subgrid is proposed. The physical space is composed of two fictitious spaces by equivalent principle. More details and accurate results in critical areas of interest are obtained by Huygens method replacing the wave equation on the interface of main grid and subgrid. Following physical principles rigorously,...
The increase of the time step size significantly deteriorates the property of the coefficient matrix generated from the Crank-Nicolson finite-difference time-domain (CN-FDTD) method. As a result, the convergence of classical iterative methods, such as generalized minimal residual method (GMRES) would be substantially slowed down. To address this issue, this paper mainly concerns efficient computation...
In this paper, the three-dimensional CN-FDTD algorithm is applied to analyze the planar microstrip circuits. Under the condition of the same time step size which is far larger than the CFL stability condition, the accuracy of CN-FDTD is much higher than ADI-FDTD
In this paper, the implicit three-dimensional unconditionally stable Crank-Nicolson finite-difference time-domain method (3-D CN-FDTD) is presented. The comparison of numerical simulations of the 3-D CN-FDTD method with other methods show that good agreement is obtained between the data computed with the 3-D CN-FDTD scheme by using time steps twenty exceeding the Courant-Friedrich-Levy (CFL) limit...
In this article, two kinds of absorbing boundary conditions (ABCs) are jointly employed for the ADI-FDTD algorithm: The Gedney's uniaxial PML (UPML) scheme is applied in propagation direction and Mur's first order ABC is set on the other outer surfaces. The manner to apply the source excitation in ADI-FDTD algorithm is described. The numerical simulation of a planar antenna demonstrates the validity...
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