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20 results on '"Reuschel, Torsten"'

4. Modeling S-parameters of interconnects using periodic Gaussian process kernels

Author

Garbuglia, Federico, Spina, Domenico, Reuschel, Torsten, Schuster, Christian, Deschrijver, Dirk, and Dhaene, Tom

Subjects
Technology and Engineering
Abstract

In this paper, we present a novel technique to model wide-band scattering parameter (S-parameter) curves of high-speed digital interconnects. The proposed technique utilizes a new kernel function with periodic components for Gaussian process (GP) models. After proper training, the GP models are able to predict the S-parameter values at arbitrary frequency points inside the trained interval. The performance of the proposed technique is reviewed by means of correlation with standard Gaussian Processes with squared exponential kernel and Matern kernel. Results for the proposed technique show an increased prediction accuracy when applied to interconnects.

Published
2023

18. On the Treatment of Arbitrary Boundary Conditions Using a Fast Direct \mathcal H -Matrix Solver in MoM.

Author

Vogt, Alexander, Reuschel, Torsten, Bruns, Heinz-D., Le Borne, Sabine, and Schuster, Christian

Subjects
*MOMENTS method (Statistics), *BOUNDARY value problems, *FREQUENCY-domain analysis, *MATRICES (Mathematics), *DIELECTRICS, *PLANE wavefronts
Abstract

This communication adapts the formalism of hierarchical ( \mathcal H -) matrices to the direct solution process (LU decomposition) of the method of moments (MoM) in the frequency domain. A novel clustering approach based on physical constraints is presented and extended to treat dielectric bodies as well as arbitrary boundary conditions. Comparisons with other numerical methods are provided. The analyses show a considerable speedup of the computation times and a significant reduction of required memory compared with the traditional MoM solution process, especially for highly resonant structures where iterative solvers like the multilevel fast multipole algorithm show poor convergence. [ABSTRACT FROM PUBLISHER]

Published
2016
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20. Analysis and Modelling towards Hybrid Piezo-Electromagnetic Vibrating Energy Harvesting Devices.

Author

Reuschel, Torsten and Salehian, Armaghan

Subjects
*PIEZOELECTRICITY, *ELECTROMAGNETIC fields, *ENERGY harvesting, *ELECTRIC power, *PERMEABILITY, *CANTILEVERS, *MATHEMATICAL models
Abstract

The efficiency of mobile electrical devices increased over the last years. Self-supply by harvesting ambient energy became a possibility of reducing operational costs by ruling out the need of battery replacement. Many energy harvesting devices employ cantilever configurations with base excitation to increase the effective displacement. The proposed design extends this design with an electromagnetic harvesting device (EMH) placed at its tip. It features an alternating stack of magnets with opposing poles and discs of highly permeable material. The composite cylinder is encircled by coils. This EMH design has successfully been employed for ocean wave harvesting and vehicle suspension systems. Its efficiency with respect to mass and energy output is compared to a previously published design using a single magnet placed at the tip moving within a coil. There exists proof that combining readily available technologies into a so-called coupled or hybrid design can increase the efficiency in comparison to respective stand-alone designs. Once the model for the proposed design is derived and evaluated, it is extended by a cantilevered excitation. Piezoelectric layers for hybrid harvesting may be included in future research. [ABSTRACT FROM AUTHOR]

Published
2011
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