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Accurate analysis of inhomogeneously filled cavities by vector finite element method (VFEM) is presented in this paper. A generalized theory is presented and a tetrahedral subdivision element is exerted for the analysis of inhomogeneously loaded cavities. As a validation, the resonant frequencies of the rectangular and cylindrical cavities filled with dielectric of different types are computed and...
A simplified approach to analysis of finite and curved conductor-dielectric periodic (CDP) screen is proposed. The contribution of the element in the real structure is estimated by that of the elaborately constructed virtual infinite planar CDP structure. The analytic results based on Floquet theorem are useable for the proposed approach thus high efficiency and accuracy are obtained. The calculated...
The modified harmonic balance finite element method was applied to investigate the DC biased problem in the saturated electromagnetic devices. The electromagnetic field was solved by the block Gauss-Seidel algorithm combined with the relaxation iterative method. The DC bias effects on magnetizing current and magnetic induction was analyzed by means of harmonic solution in multi-frequency domain. The...
The DC biased problem of the Epstein Frame-like core model is investigated by using the Harmonic Balance Finite Element Method (HBFEM). It considers coupling between the electric circuit and the magnetic field. The magnetizing current and its harmonic components can be calculated directly in the harmonic domain. Comparing the calculated results with the experimental data shows consistency. The DC...
The harmonic balance finite element method (HBFEM) is combined with the fixed-point technique to calculate the steady-state magnetic field in a laminated core model (LCM). The magnetic intensity is divided into linear and nonlinear parts in the form of harmonics. The hysteresis model based on the consuming function is taken into account in the harmonic computation. The magnetic field and magnetizing...
Based on process of fine-blanking, a FE model of fine-blanking is established by using DEFORM-2D software, and the die wear condition is predicted in applying Archard's wear formula. The developing trend of the die wear and workpiece edge quality are analyzed systematically, as well as the change law of m. Obtained from simulation with different cutting edge model respectively. The obtained results...
Well casing integrity is vital for the safe operations of oil wells, and also significant to detect well casing defects. Magnetic flux leakage (MFL) detection technology is widely-used in detecting the defects of various pipelines. Owing to the very complicated environment where well casing is laid in, the system which based on magnetic flux leakage technology is not mature yet to detect well casing...
Well casing integrity is important for the safe operations of oil wells, and is of great significance to detect well casing defects. Magnetic Flux Leakage (MFL) Detection Technology is widely used to detect the defects of various pipelines. Because the environment where well casing is laid in is usually very complicated, the system which based on magnetic flux leakage technology is not mature yet...
A multiple degree-of-freedom (DOF) active vibration isolation module (AVIM) is designed and constructed, which consists of two magnetostrictive actuators, [1] applied to active vibration control, and four spring-rubber elements for passive support and damper. This paper addresses the dynamics model of the AVIM. The Vibration differential equations of it with magnetostrictive actuators has been established...
Based on finite-element method of 1-dimensional conductor element coupled with 3-dimensional soil element, a coordinate transformation is carried out. The irregular hexahedron domain of element is mapped onto a cube domain. Considering the frequency dependent characteristic of the discretized elements, the grounding performance of the substation grounding grids in multilayer earth is analyzed, and...
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