Optimization Of Geometric Parameters Of Spiral Inductors Using Genetic Algorithms

2006 ◽  
Author(s):  
E.D. Gadjeva ◽  
V.P. Durev ◽  
M.H. Hristov ◽  
D.I. Pukneva
Keyword(s):  
Genetic Algorithms ◽  
Geometric Parameters ◽  
Spiral Inductors

Optimization of Aerodynamic Parameters of an Elliptical-Bladed Savonius Wind Rotor Using Multi-Objective Genetic Algorithms

2019 ◽  
Author(s):  
Nur Alom ◽  
Ranjan Das ◽  
Ujjwal K. Saha
Keyword(s):  
Genetic Algorithms ◽  
Lift Coefficient ◽  
Optimization Technique ◽  
Geometric Parameters ◽  
Rotor Blades ◽  
Power Coefficient ◽  
Speed Ratio ◽  
Direct Optimization ◽  
Multi Objective ◽  
Augmentation Techniques

Abstract The Savonius wind rotor, a drag-based machine, despite having lesser efficiency has got several advantages such as low price, easy installation, better starting capability independency to wind direction. In order to enhance the performance of such rotor, several design modifications have been built by changing the geometric parameters such as overlap ratio, aspect ratio, tip speed ratio, number of rotor blades and effect of shaft and end plates. Apart from the various geometric parameters, several rotor blades and augmentation techniques has evolved to improve the performance of the Savonius rotor. This has been achieved by using a host of numerical and experimental methods. In the present investigation, the multi-objective genetic algorithms have been used to optimize the incoming velocity, and the torque and lift coefficient for a novel elliptical-bladed profile for maximizing the rotor power coefficient. The multi-physics solver ANSYS direct optimization technique has been used to implement the genetic algorithms. The results obtained from the genetic algorithms have been compared with the established results under identical conditions.

Optimized Analysis of the Hollow Floor Based on the Niche Genetic Algorithms

2013 ◽  
Vol 421 ◽  
pp. 751-755
Author(s):  
Chuan Teng Huang ◽  
Zhi Jun Wang
Keyword(s):  
Genetic Algorithms ◽  
Optimal Solution ◽  
Threshold Value ◽  
Geometric Parameters ◽  
Optimization Analysis ◽  
Global Optimal Solution ◽  
Excellent Mechanical Property ◽  
Section Design ◽  
Global Optimal ◽  
Niche Genetic Algorithms

Nowadays, the hollow floor is widely used due to its excellent mechanical property and economic benefit.However, its related specification is absence of evaluation in geometric parameters. The optimized analysis aimed at the hollow floor under vertical load, the total cost of the hollow floor is considered as a objective function, the maximum deflection and the threshold value of the geometric parameters are considered as constrain conditions. The program, which introduces the section design and compiled by the python script, based on the niche genetic algorithms is used to analyze the optimization of a hollow floor. Comparing to the global optimal solution, the program achieves good results. It indicates that the niche genetic algorithms is efficient and suited for the optimization analysis of hollow floor. The above mentioned conclusions will be conducive to engineering design and further research in this field.

scholarly journals Analysis of reactive and resistive open waveguide filters for use in microwave‐heating applicators

2011 ◽  
Vol 30 (5) ◽  
pp. 1606-1615 ◽  
Author(s):  
Francisco J. Clemente‐Fernández ◽  
Juan Monzó‐Cabrera ◽  
Juan L. Pedreño‐Molina ◽  
Antonio J. Lozano‐Guerrero ◽  
Alejandro Díaz‐Morcillo
Keyword(s):  
Genetic Algorithms ◽  
Microwave Heating ◽  
Design Methodology ◽  
Geometric Parameters ◽  
Electric Permittivity ◽  
Content Type ◽  
Open Waveguide ◽  
Waveguide Filters ◽  
Practical Implications

PurposeThe purpose of this paper is to analyze the limitations of conventional reactive and resistive filters employed in the open ports of microwave‐heating applicators, in order to know the limits of these filters as a function of the permittivity of the inner materials.Design/methodology/approachCST Studio Suite™ commercial electromagnetic software has been employed to simulate the behaviour of singly and doubly corrugated reactive filters. Additionally, several configurations for resistive filters implemented with water are assessed. Optimization procedures based on genetic algorithms have been used by modifying some geometric parameters of the filters in order to obtain the best possible bandstop response.FindingsResults show the serious limitations of these filters depending on the electric permittivity of the inner materials.Practical implicationsThese limitations restrict the type of the materials that can be processed, so there is a need for new structures which solve these problems.Originality/valueAlthough extensively used in many applications, there are few works that analyze the behaviour of these filters as a function of the geometric parameters or the sample permittivity, and therefore this influence needs to be studied.

Lectin-Induced RBC Agglutination: Chemical vs. Cryofixation

1980 ◽  
Vol 38 ◽  
pp. 664-665
Author(s):  
Dean A. Handley ◽  
Lanping A. Sung ◽  
Shu Chien
Keyword(s):  
Lectin Binding ◽  
Freeze Substitution ◽  
Electrostatic Charge ◽  
Geometric Parameters ◽  
Comparative Approach ◽  
Chemical Fixation ◽  
Cell Surfaces ◽  
Minimal Cell ◽  
Membrane Stiffness ◽  
Cell Contour

RBC agglutination by lectins represents an interactive balance between the attractive (bridging) force due to lectin binding on cell surfaces and disaggregating forces, such as membrane stiffness and electrostatic charge repulsion (1). During agglutination, critical geometric parameters of cell contour and intercellular distance reflect the magnitude of these interactive forces and the size of the bridging macromolecule (2). Valid ultrastructural measurements of these geometric parameters from agglutinated RBC's require preservation with minimal cell distortion. As chemical fixation may adversely influence RBC geometric properties (3), we used chemical fixation and cryofixation (rapid freezing followed by freeze-substitution) as a comparative approach to examine these parameters from RBC agglutinated with Ulex I lectin.

Genetic Algorithms—a Tool for OR?

1996 ◽  
Vol 47 (4) ◽  
pp. 550-561 ◽  
Author(s):  
Kathryn A Dowsland
Keyword(s):  
Genetic Algorithms

Evaluation of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings by the multi-frequency radio wave method of a slow surface electromagnetic waves

2020 ◽  
pp. 51-58
Author(s):  
Aleksandr I. Kazmin ◽  
Pavel A. Fedjunin
Keyword(s):  
Radio Wave ◽  
Noise Level ◽  
Electromagnetic Waves ◽  
Dielectric Materials ◽  
Geometric Parameters ◽  
Experimental Investigations ◽  
Wave Method ◽  
Dielectric Coatings ◽  
Surface Electromagnetic Waves ◽  
Multilayer Dielectric

One of the most important diagnostic problems multilayer dielectric materials and coatings is the development of methods for quantitative interpretation of the checkout results their electrophysical and geometric parameters. The results of a study of the potential informativeness of the multi-frequency radio wave method of surface electromagnetic waves during reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings are presented. The simulation model is presented that makes it possible to evaluate of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings. The model takes into account the values of the electrophysical and geometric parameters of the coating, the noise level in the measurement data and the measurement bandwidth. The results of simulation and experimental investigations of reconstruction of the structure of relative permittivitties and thicknesses of single-layer and double-layer dielectric coatings with different thicknesses, with different values of the standard deviation (RMS) of the noise level in the measured attenuation coefficients of the surface slow electromagnetic wave are presented. Coatings based on the following materials were investigated: polymethyl methacrylate, F-4D PTFE, RO3010. The accuracy of reconstruction of the electrophysical parameters of the layers decreases with an increase in the number of evaluated parameters and an increase in the noise level. The accuracy of the estimates of the electrophysical parameters of the layers also decreases with a decrease in their relative permittivity and thickness. The results of experimental studies confirm the adequacy of the developed simulation model. The presented model allows for a specific measuring complex that implements the multi-frequency radio wave method of surface electromagnetic waves, to quantify the potential possibilities for the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric materials and coatings. Experimental investigations and simulation results of a multilayer dielectric coating demonstrated the theoretical capabilities gained relative error permittivity and thickness of the individual layers with relative error not greater than 10 %, with a measurement bandwidth of 1 GHz and RMS of noise level 0,003–0,004.

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