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Proposal of heuristic regression method applied in descriptive data analysis: case studies

Gomes F. A., Assis A. de O., Reis M. R. da C., Gomes V. M., Oliveira S. G. M., Araujo W. R. H. de, Calixto W. P.

Transactions on Environment and Electrical Engineering

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2017

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Vol. 2, No. 2

51--57

EN

The purpose of this paper is to use the hybridized optimization method in order to find mathematical structures for analysis of experimental data. The heuristic optimization method will be hybridized with deterministic optimization method in order to that structures found require not knowledge about data generated experimentally. Five case studies are proposed and discussed to validate the results. The proposed method has viable solution for the analysis of experimental data and extrapolation, with mathematical expression reduced.

2

Metric for calculation of system complexity based on its connections

Paiva J. R. B., Gomes V. M., Rodrigues B. A., Silva L. F. A., Aniceto B. C. M., Furriel G. P., Calixto W. P.

Transactions on Environment and Electrical Engineering

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2017

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Vol. 2, No. 1

67--73

EN

This paper proposes a methodology based on system connections to calculate its complexity. Two study cases are proposed: the dining Chinese philosophers’ problem and the distribution center. Both studies are modeled using the theory of Discrete Event Systems and simulations in different contexts were performed in order to measure their complexities. The obtained results present i) the static complexity as a limiting factor for the dynamic complexity, ii) the lowest cost in terms of complexity for each unit of measure of the system performance and iii) the output sensitivity to the input parameters. The associated complexity and performance measures aggregate knowledge about the system.

3

Calculation of the influence of slot geometry on the magnetic flux density of the air gap

Lima R. A. de, Coimbra A. C. P., Almeida T., Gomes V. M., Pereira T. M., Alves A. J., Calixto W. P.

Transactions on Environment and Electrical Engineering

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2017

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Vol. 2, No. 1

81--89

EN

The objective of this work is to investigate the influence of slotted air gap constructive parameters on magnetic flux density of rotating machines. For this purpose, different approaches were used to solve the air gap field diagram using finite element method and the magnetic field distribution uniformity was evaluated by Carter's factor calculation on two-dimensional and three-dimensional models. Sensitivity analysis of slot constructive parameters was performed and results show that slot geometry modifies the magnetic flux on air gap and shifts the air gap magnetic equipotential midline of double slotted machines. Finally, minimization of Carter’s factor on two-dimensional model presents an optimized slot geometry with a near uniform magnetic flux density distribution.

4

Analysis and monitoring of electrical grounding grid encapsulated with concrete: case study using simulation in finite element method

Pereira T. M., Lima R., Gomes V. M., Calixto W. P., Alves A. J.

Transactions on Environment and Electrical Engineering

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2017

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Vol. 2, No. 2

31--36

EN

This work study the influence of concrete, plaster, clay and others buried structures in grounding systems. Comparison of soil characteristics between dry and rainy seasons on different grounding systems. The study includes comparison of six different grounding system on dry season and wet season. Simulations in finite element method was performed for tree layer stratified soil and the electrostatic equipotential surfaces were mapped into the region of interest.