International Journal of Applied Electromagnetics and Mechanics - Volume 56, issue S1

Authors: Cardelli, Ermanno | Faba, Antonio | Pompei, Michele | Antonio, Simone Quondam | Tissi, Francesco

Article Type: Research Article

Abstract: In this paper we propose a procedure to design pulse generators for the simulation of lightning indirect effects in avionic systems. A genetic algorithm is used to identify the generator parameters for different strength levels to obtain high accuracy of the voltage and current waveforms in comparison to the international standards requirements. A dedicated experimental set-up is used to evaluate the accuracy and the effectiveness of the optimization procedure. Measured and computed data are compared and discussed.

Keywords: Optimal design, genetic algorithm, electromagnetic compatibility, lightning

DOI: 10.3233/JAE-172289

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 56, no. S1, pp. 123-131, 2018

Authors: Carcangiu, Sara | Fanni, Alessandra | Forcinetti, Renato | Montisci, Augusto

Article Type: Research Article

Abstract: The aim of the proposed work is to study the optimal design of an innovative Thermo-Acoustic-Magneto-Hydro-Dynamic electric generator, with particular reference to the Magneto-Hydro-Dynamic section. A multi-objective optimization algorithm, which makes use of a Tabu Search meta-heuristic, has been developed to this purpose. Thermo-Acoustic and Magneto-Hydro-Dynamic energy conversion processes give a great advantage by converting energy without solid moving components. This makes the cited technologies very interesting for the low weight, the low maintenance costs, and the high conversion efficiency. The design of the generator has to be optimized by considering conflicting objectives, i.e., maximizing the output power, minimizing the …applied electrical voltage, and minimizing mass and size of the device. Therefore, a multi-objective vectorial optimization approach is mandatory. A fully vector scheme has been implemented that takes under control both the Pareto optimality of the solutions, and the uniformity in the Pareto front sampling. Show more

Keywords: Magneto-hydro-dynamics, thermo-acoustics, multi-objective optimization, tabu search

DOI: 10.3233/JAE-172291

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 56, no. S1, pp. 133-142, 2018

Authors: Boggero, Luca | Fioriti, Marco | Ragusa, Carlo Stefano | Corpino, Sabrina

Article Type: Research Article

Abstract: In this paper an innovative methodology for the conceptual design of hybrid-electric powered aircraft is proposed. The main idea is the optimization of the designed airplane through the negotiation and settling down of the high-level requirements. This optimization problem is multiobjective, as the goal is the minimization of the fuel and maximum takeoff weight, the time reduction of the climb phase and the enhancement of the safety level during takeoff. In order to fulfil these objectives, three Top Level Aircraft Requirements (TLARs) are relaxed. A one more design variable is considered, the hybridization degree, meant as the ratio between the …electric power and the total propulsive power. The proposed design and optimization methodology is based on the Fuzzy Logic approach. For each objective function, a fuzzy set is defined. The fuzzy sets fix the boundaries of acceptable resulting objectives included between a minimum and a maximum value. The consideration of all the fuzzy sets identifies the optimal solution, which is characterized by the maximum customer’s satisfaction degree. An Overall Aircraft Design (OAD) environment is set up, in which a deterministic optimizer and fuzzy rules are implemented. The results demonstrate that the optimal solution is achieved by a hybrid airplane. Furthermore, the negotiation of the three requirements entails an improvement of the customer’s satisfaction. Show more

Keywords: Fuzzy Logic, multiobjective optimization, parallel hybrid propulsion system, aircraft preliminary design

DOI: 10.3233/JAE-172293

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 56, no. S1, pp. 143-152, 2018

Authors: Kim, Young Hyun | Lee, Jung Ho

Article Type: Research Article

Abstract: This paper deals with computation on the ratio of rotor core width and insulator width to maximize the torque density and to minimize the torque ripple of axially multi-layer type synchronous reluctance motor (ALA-SynRM) for electric valve actuators. The thickness of the rotor core and flux barrier has the greatest effect on the flux path. Therefore, the optimum design on proportion of rotor shape for ALA-SynRM is proposed in this paper by coupled finite element method (FEM) and response surface method (RSM). Also, the characteristics dependence on the presence or absence of a rotor core rib, which causes magnetic saturation, …was analyzed by calculating the inductance. Finally, the results of analysis are demonstrated through the simulation and by an experiment. Show more

Keywords: Axially laminated type synchronous reluctance motor (ALA-SynRM), electric valve actuator, Box-Behnken method, proportion of rotor structure

DOI: 10.3233/JAE-172292

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 56, no. S1, pp. 153-162, 2018

Authors: Chiariello, Andrea G. | Formisano, Alessandro | Ledda, Francesco | Martone, Raffaele | Pizzo, Francesco

Article Type: Research Article

Abstract: In a large number of engineering applications, the optimization of magnets’ shape is required. Unfortunately, due to the complexity of the geometries involved, the computing burden can be too high, making the task unfeasible. Here, a shape optimization model is proposed, based on the discretization of the research domain; in this way, the optimization task is reduced to the search for of the optimal shape among all the possible compositions of elementary shapes in the research domain. The proposed technique gives a strong reduction of the computing burden whereas preserving the accuracy needed.

Keywords: Magnet design, shape optimization, combinatorial analysis

DOI: 10.3233/JAE-172288

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 56, no. S1, pp. 163-169, 2018

Authors: Bazzo, T.P.M. | Gerbaud, L. | Kolzer, J.F. | Carlson, R. | Wurtz, F.

Article Type: Research Article

Abstract: The present paper deals with a large multidisciplinary design optimization (MDO) applied to a wind turbine permanent magnet synchronous generator (PMSG). The multidisciplinary nature of the model allows reliable results, but it demands high complexity and a large number of variables. Furthermore, to calculate the wind turbine energy production it is necessary to include several operating points in the model, increasing even more the dimension of the problem. To deal with this large optimization problem, the sequential quadratic programming (SQP) algorithm has been chosen. The results show that, besides the model complexity, the solution is obtained fast.

Keywords: Large optimization problem, multidisciplinary design optimization, permanent magnet synchronous generator design, sequential quadratic algorithm, wind power

DOI: 10.3233/JAE-172287

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 56, no. S1, pp. 171-181, 2018

Authors: Lee, Kang Hyouk | Seo, Kyung Sik | Choi, Hong Soon | Park, Il Han

Article Type: Research Article

Abstract: This paper proposes a multiple level set method for multi-material shape optimization in an electromagnetic system. This method enables the handling of multi-material interfaces simultaneously. The sign combination of the level set functions is used for identifying the different material regions and their interfaces. The continuum sensitivity formula for the multi-material interfaces is adopted for the velocity field in the multiple level set equations. Numerical examples are tested to show the usefulness of the proposed method.

Keywords: Multiple level set method, continuum shape sensitivity, electromagnetic system, finite element method, shape optimization

DOI: 10.3233/JAE-172290

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 56, no. S1, pp. 183-193, 2018