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In this paper we investigate the potential-based finite element algorithms for eddy-current problems. In our models the source coil carries a pulse excitation current generating a transient field. As distinguished from the traditional coupled algorithm whose discrete equation system including both vector and scalar potential unknowns is solved at every time-step, a novel decoupled algorithm is presented...
A new method to solve nonlinear Transient Electromagnetic Field under voltage source motivation was proposed, in which the external circuits, nonlinear magnetic properties, eddy-current effects and movement were taken into account. The method was solved by the Crank-Nicholson method, and can be applied to engineering.
In this paper we demonstrate a efficient method of deriving the necessary matrices to implement a two-dimensional finite element analysis of multilayered piezoelectric micro-acoustic wave devices. Whereas other commercially available simulation packages are typically based on a modification of a structurally relevant problem, the notations and methods presented in this paper are characteristic of...
Anisotropic perfectly matched layer is introduced in spectral-element time-domain method (SETD) as an absorbing boundary condition. By the use of PML, the SETD keeps the diagonal characteristic in mass matrix. So the updating of electromagnetic field is fully explicit when a central difference scheme is employed for the time discretization. Several numerical results have been shown that the use of...
A formulation of finite element methods (FEM) for both two-dimensional (2-D) and axisymmetric magnetic fields - electric circuit cosimulation is presented. A matrix approach is introduced to deduce the formulation. The advantage is that a unified formulation is realised for both 2-D field and axisymmetric field.
Model-based testing of state based systems is known to be able to spot non-conformance issues. However, up to half of these issues appear to be errors in the model rather than in the system under test. Errors in the specification at least hamper the prompt delivery of the software, so it is worth while to invest in the quality of the specification. Worse, errors in the specification that are also...
A class of discrete-time nonlinear system and measurement equations involving incrementally conic nonlinearities with finite energy disturbances is considered. A linear matrix inequality based design approach is presented that guarantees the satisfaction of a variety of performance criteria ranging from simple estimation error boundedness to dissipativity. Simple simulation examples are included to...
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