Three dimensional pole shape optimization of claw pole machines based on a hybrid model

Devornique, Geoffrey; Fontchastagner, Julien; Netter, Denis; Takorabet, Noureddine

doi:10.3233/jae-182318

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…Devornique et al recommended optimizing the linear and longitudinal alignment of the U model. Digital samples are provided to compare the proposed technology with available methods, whose results prove the high efficiency of the proposed algorithm [ 4 ]. For multicenter optimization issues, Mercado-Borrayo et al proposed a genetic algorithm to effectively solve these problems [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Font Design in Visual Communication Design of Genetic Algorithm

Wang

Chung²

2022

Emergency Medicine International

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The text has played an essential role in the advancement of human civilization. It is used now as a valuable cultural heritage that has been experienced for a thousand years. The passing text must have its irreplaceable advantages and charm. People are extremely sensitive to visual symbols, and it is also the first step in which people can know things. Most of the books in today’s market focus on pictures and colors, which ignores the design of the text. This makes the text boring taste, causing the reader’s visual fatigue, which is not conducive to readers absorbing information through books. Therefore, this paper studies the font design in the design of the visual algorithm based on the genetic algorithm, and the font design is analyzed by the particle swarming algorithm, the decision MIMO-SCMA system of the genetic algorithm. It aims to address the dryness of today’s texts by constructing texts that are instantly recognizable and visually appealing to readers. Through innovative visual concepts, readers can enjoy the process of acquiring knowledge. In this paper, to investigate the effectiveness of the genetic algorithm in font design, the number of experimental research subjects was set to 300, and 280 valid questionnaires were collected to investigate the satisfaction of users with the newly designed fonts. Experiments showed that the visual communication design based on a genetic algorithm has increased by 6.52% for the design satisfaction and the number of fonts that use the system is also increasing.

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Section: Introductionmentioning

confidence: 99%

Font Design in Visual Communication Design of Genetic Algorithm

Wang

Chung²

2022

Emergency Medicine International

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“…The authors propose to develop a simple method to avoid the preprocessing part reevaluations in an iterative process, similar to the moving band method in the 2 D rotating movement modeling. In the case of optimization processes only few methods exist to reduce the time of each evaluation as in Devornique et al (2018) in which efficient FE models are developed to find a balance between precision and CPU time. That is why the authors proposed, by dint of a trick, a different approach in the use of FEM which mathematically respects the standard weak form.…”

Section: Methodsmentioning

confidence: 99%

FEM using projection of physical properties suitable for movement modeling and optimization processes

Ristagno

Giraud

Fontchastagner

et al. 2020

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Purpose Optimization processes and movement modeling usually require a high number of simulations. The purpose of this paper is to reduce global central processing unit (CPU) time by decreasing each evaluation time. Design Methodology Approach Remeshing the geometry at each iteration is avoided in the proposed method. The idea consists in using a fixed mesh on which functions are projected to represent geometry and supply. Findings Results are very promising. CPU time is reduced for three dimensional problems by almost a factor two, keeping a low relative deviation from usual methods. CPU time saving is performed by avoiding meshing step and also by a better initialization of iterative resolution. Optimization, movement modeling and transient-state simulation are very efficient and give same results as usual finite element method. Research Limitations Implications The method is restricted to simple geometry owing to the difficulty of finding spatial mathematical function describing the geometry. Moreover, a compromise between imprecision, caused by the boundary evaluation, and time saving must be found. Originality Value The method can be applied to optimize rotating machines design. Moreover, movement modeling is performed by shifting functions corresponding to moving parts.

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“…To design the machine and its supply simultaneously, the FE model is coupled with a free and open‐source optimization framework: NOMAD, 20 based on mesh adaptive direct search (MADS) algorithms. The initial geometry is described thanks to 40 real parameters 21 —2 for the commutator, 7 for the rotor, and 31 for the stator. A complex optimization problem consisting in torque maximization under many constraints is then solved:

\max_{x \in {normalℝ}^{40}} (Γ_{mean}) under \{\begin{matrix} left \\ L_{B} \leq X \\ X \leq U_{B} \\ |\frac{Γ_{\max} - Γ_{\min}}{{normalΓ}_{mean}}| - 15 % \leq 0 \\ S_{{copper}_{rotor}} \leq 55 % S_{slot} \\ S_{{copper}_{stator}} \leq 78 % S_{slot} \\ J_{stator} \leq 12 A \cdot {mm}^{- 2} \end{matrix}

…”

Section: Claw Pole Machinementioning

confidence: 99%

Level‐set‐based method for designing novel brushed synchronous machines

Ristagno

Devornique

Giraud

et al. 2023

Int J Numerical Modelling

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Nowadays, research on electromagnetic devices increasingly focuses on multiphysics three‐dimensional complex systems. However, this kind of simulations require huge computational resources and consequently very high CPU time. Ristagno et al. proposed a level‐set based method allowing meshing step savings in any iterative processes (as movement modeling or optimization processes). The level‐set method lies in implicit description of moving fronts as described in the study by Osher et al. (1988). Inspired by Räisänen et al., all physical parameters (material properties, supply or armature movement) are implemented by projection of mathematical functions. In this paper, the authors proposes to study and design a new kind of mechanical commutator for DC machines thanks to this coupled method. Indeed, there is a renewed interest in DC machines because they can be suitable for small mobilities. To be noted, small mobility concerns all kind of vehicles (2 wheels–4 wheels–autonomous vehicles such as drones) that have speeds below 50 km/h. However, specifications for traction applications are difficult to achieve for such a rustic machine and requires some modifications. That is why, inspired by usual synchronous machine, the commutator has been redesigned to obtain expected theoretically signal waveform. Furthermore, numerical coupled simulations have been used to design both machine and supply simultaneously. This work has led to the manufacture of a proof of concept and preliminary results are very promising.

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Three dimensional pole shape optimization of claw pole machines based on a hybrid model

Cited by 5 publications

References 11 publications

Font Design in Visual Communication Design of Genetic Algorithm

Font Design in Visual Communication Design of Genetic Algorithm

FEM using projection of physical properties suitable for movement modeling and optimization processes

Level‐set‐based method for designing novel brushed synchronous machines

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