International Journal of Applied Electromagnetics and Mechanics - Volume 17, issue 1-3

Article Type: Editorial

Abstract: Preface to the ISTET '01 special issue.

DOI: 10.3233/JAE-2003-243

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 17, no. 1-3, pp. 1-3, 2003

Authors: Russer, Peter

Article Type: Research Article

Abstract: The application of network-oriented methods to electromagnetic field problems can contribute significantly to the problem formulation and solution methodology. The field problem can be systematically treated by the segmentation technique and by specifying canonical Foster representations for the subcircuits. Connection between different subdomains is obtained by selecting the appropriate independent field quantities via Tellegen's theorem. For each subdomain, as well as for the entire circuit, an equivalent circuit extraction procedure is feasible, …either in closed form for subdomains amenable of analytical description or via the relevant pole structure description when a numerical solution is available. Show more

DOI: 10.3233/JAE-2003-257

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 17, no. 1-3, pp. 5-17, 2003

Authors: Cangellaris, Andreas | Russer, Peter

Article Type: Research Article

Abstract: Network concepts in electromagnetics motivate and faciltate the application of complexity reduction methods to the state equations describing the discretized electromagnetic field. Two general approaches toward such reduction are reviewed in this paper. The first involves the application of model order reduction methodologies in the context of the state space representation of the discrete electromagnetic model. The second considers the application of system identification and parameter estimation methods for reduction of computational …time and automatic generation of lumped element equivalent circuits. Show more

DOI: 10.3233/JAE-2003-245

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 17, no. 1-3, pp. 19-30, 2003

Authors: Hahn, A. | Kost, A. | Jänicke, L. | Miethner, K.

Article Type: Research Article

Abstract: This article describes the influence of gaps on the shielding performance of a box. The investigation has been carried out with the Finite Element Method and especially a method with adaptive mesh generation.

DOI: 10.3233/JAE-2003-262

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 17, no. 1-3, pp. 31-43, 2003

Authors: Ehrich, Matthias | Fichte, Lars Ole | Lüer, Michael

Article Type: Research Article

Abstract: The plane transient eddy current problem of a system of N arbitrary conductors with different magnetic permeability is solved in the time domain by time-separation. This leads to an eigenvalue problem which we treat by evaluating several volume and boundary integral equations for the vector potential. It is shown that the eigenfunctions of the different integral equations form complete orthogonal systems. As examples of application we calculate the transient behavior of the conductor system after connecting …it to sources of direct voltage or direct current at time t=0. Show more

DOI: 10.3233/JAE-2003-247

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 17, no. 1-3, pp. 45-58, 2003

Authors: Lerch, R. | Kaltenbacher, M. | Landes, H. | Hoffelner, J. | Rausch, M. | Schinnerl, M.

Article Type: Research Article

Abstract: An advanced numerical calculation scheme based on finite and boundary elements as well as multigrid methods is presented. This scheme is used for the precise forecast of the dynamical behavior of piezoelectric, electrostatic and, magnetomechanical devices, especially sensors and actuators. Application examples include solenoid valves, piezoelectric source for the generation of acoustic shock waves, magnetic surface acoustic wave (SAW) filters, electrodynamic loudspeakers and magnetostrictive tool actuators.

DOI: 10.3233/JAE-2003-254

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 17, no. 1-3, pp. 59-73, 2003

Authors: Buchau, André | Rucker, Wolfgang M.

Article Type: Research Article

Abstract: Computing the capacitance coefficients of a multiconductor system embedded in multiple piecewise homogeneous dielectrics with the boundary element method in combination with the fast multipole method, the memory requirements and the computational cost for the solution of the system of linear equations are approximately proportional to the number of unknowns. In this paper it will be shown, that the calculation of the free charges on the conductors and with it the calculation of the capacitance coefficients …can be accelerated, if the fast multipole method is also used for the post-processing. Show more

DOI: 10.3233/JAE-2003-244

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 17, no. 1-3, pp. 75-89, 2003

Authors: Hofer, Anton | Horn, Martin

Article Type: Research Article

Abstract: In this paper the design of linear multivariable control systems based on the l_{1} - system norm is revised. It is shown how the well known computational difficulties inherent in this design problem can be overcome. For this purpose a procedure is proposed consisting of the steps 1) design of a suitable low order controller by semidefinite programming, 2) parametrization of all stabilizing conrollers based on the controller of the first step, 3) solution of …the design problem with linear programming methods. The efficiency of this method is demonstrated by an example. Show more

DOI: 10.3233/JAE-2003-250

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 17, no. 1-3, pp. 91-106, 2003

Authors: Tibken, Bernd | Dilaver, Kamil Fatih | Hachicho, Ossama

Article Type: Research Article

Abstract: This paper addresses the problem of global robust positivity for polynomials with coefficients depending linearly on uncertain parameters. Based on considerations from real algebraic geometry, numerical LMI solvers and the theorem of Ehlich and Zeller we propose two algorithms for the estimation of the convex region in the space of coefficients, for which a polynomial is globally positive. Illustrative examples are given.

DOI: 10.3233/JAE-2003-259

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 17, no. 1-3, pp. 107-120, 2003

Authors: Schlacher, Kurt | Kugi, Andreas

Article Type: Research Article

Abstract: This contribution presents tests, based on Lie-groups, for the accessibility and the observability of dynamic systems described by a set of implicit ordinary differential equations. It is shown that non-accessible or non-observable systems admit Lie-groups acting on their solutions such that distinguished parts of the system remain unchanged. The approach being presented requires the formal integrability of the system. Therefore, a short introduction to this theory is presented, as well as its application to systems …of differential equations. Besides the theoretical results sketches for computer algebra based algorithms are presented that are necessary to perform the test for higher order systems. Show more

DOI: 10.3233/JAE-2003-258

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 17, no. 1-3, pp. 121-132, 2003