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It is well known that the Newton–Raphson method is the most popular iterative method for nonlinear finite element problems. The method has a quadratic convergence. Under certain conditions on the Jacobian of the functional and the initial guess the Newton–Raphson method can converge very fast. However, standard evaluation of such Jacobian may not be possible for the solution of nonlinear hysteresis...
For the core characteristics of Magnetic Modulation DC transformer, This paper established the Magnetic Modulation DC transformer model based on ANSYS and carried out the three-dimensional finite element simulation for the core. The simulation data show that if we select the appropriate parameters and adopt the theoretical analysis, we can know the measured DC current and the average permeability...
In the traditional earth dam seepage calculation, the permeability coefficient of saturated soil is considered as fixed value. Actually, the seepage of earth dam carries out unsaturated characteristics. The permeability coefficient of unsaturated soil is a nonlinear function which is closely related to volumetric water content and pore water pressure. Based on the saturated-unsaturated soil seepage...
Electromagnetic pulses are fields of energy that they can damage electrical and electronic circuits at once. New technology of microelectronic circuits is sensitive to interference power. An intentional or inadvertent risk and unforeseen create irreparable damages, so that it is important to investigate electromagnetic interference from viewpoint: generation source, the effectiveness on?? electronic...
In view of effect of fluid-solid coupling on flow of oil fluids through media and effect of rheology on fluid-solid coupling, the numerical simulation models of mechanical oil expression from vegetable oil were developed. The models were solved by using of combining finite difference with finite element. The displacement experiments for extracted peanut were used to validate the models. The predicted...
The numerical simulation model of mechanical oil expression from vegetable oil was developed. It was solved by using of combining finite difference with finite element. The displacement experiment for extracted sesame was used to validate the model. As an applied example, the predictions of pore-fluid pressure dissipation and distribution were carried out. The predicted values of displacement conformed...
According to the basic idea of fluid-solid coupling theory, combining percolation mechanics with rock-soil mechanics and considering threshold pressure gradient and fluid-solid coupling character of low permeability reservoirs, a numerical model is established, which can describe the fluid-solid coupling character in saturated deformable low permeability reservoirs and can be solved by coupling numerical...
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