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The parabolic equation (PE) method is employed to solve the Loran-C additional secondary factors (ASFs) over irregular terrain. Based on the split-step Fourier transform (SSFT) algorithm, the method has been proven to be numerically efficient. The ASF results are compared to those of the integral equation (IE) method and the finite-difference time-domain (FDTD) method. Very good agreements are observed...
Spacer dampers are attached on the bundled conductors to suppress aeolian vibrations for many decades. In present study a new aeolian excitation induced by shed vortex had been derived base on wind power equivalent principle; the spatial distribution and the wind power input can be considered. The two-bundled conductor with spacer dampers attached is simplified to the mass-spring-dampers modle; dynamic...
An algorithm using finite difference to digitize a wave equation is introduced for the simulation of sound propagating in different sound intermediate. Simulation system according to algorithm is achieved using VC on a Windows 2000 platform. Simulation model according to actual noise-proof board situation in double driveway is built. Calculation project is designed to get the test result of different...
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