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Plastic extrusion is a typical plastic manufacturing process. After heating, plastic with high resilience and low viscosity, dependent on the temperature, are extruded from the nozzle. The change of the rheological properties will swell the extruded geometry and reduce the deposited surface quality and structure. Thus, the swelling phenomenon of the visco-elastic fluid during extrusion has become...
In order to reduce the computational complexity and computational time for the non-linear quasi-electrostatic problems, the reduced order finite element model based on proper orthogonal decomposition (POD) and discrete empirical interpolation (DEIM) is proposed. The presented reduced order algorithm is applied to compute the electrical field distribution in the winding end of a type of ±500kV converter...
In the design and optimization of quartz crystal resonators, the finite element method has been adopted for the analysis of quartz crystal plates with complications for the vibration frequency and mode shapes. Further extension of such analysis can be made by using complex solutions to extract the electrical parameters of quartz crystal resonators because it is a typical electronic component in circuit...
In this paper, a solution to the double curl equation with generalized Coulomb gauge is proposed based on the vectorial representation of the magnetic vector potential. Coulomb gauge is applied to remove the null space of the curl operator and hence the uniqueness of the solution is guaranteed. However, as the divergence operator cannot act on the curl-conforming edge basis functions directly, the...
A state space finite element method is presented for the calculation of transient electric field in oil-immersed insulation system of converter transformer. Firstly, the state equation is derived based on the quasi-static electric field theory, combined with the given boundary value using the penalty method, which has a clear physical meaning. Secondly, the state equation is solved in a fine integration...
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...
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