Design optimization of perforation on deflector for improved performance of vortex settling basin *

2021 ◽  
Author(s):  
Zhuoyun Mu ◽  
Yiyi Ma ◽  
Lin Li
Keyword(s):  
Design Optimization ◽  
Settling Basin ◽  
Improved Performance

scholarly journals Improved performance of stellarator coil design optimization

2020 ◽  
Vol 86 (2) ◽  
Author(s):  
Jim-Felix Lobsien ◽  
Michael Drevlak ◽  
Thomas Kruger ◽  
Samuel Lazerson ◽  
Caoxiang Zhu ◽  
...  
Keyword(s):  
Stochastic Optimization ◽  
Design Optimization ◽  
Three Dimensional ◽  
Local Maximum ◽  
Average Field ◽  
Test Case ◽  
Coil Design ◽  
Applied Optimization ◽  
Improved Performance ◽  
Coil Shape

Following up on earlier work which demonstrated an improved numerical stellarator coil design optimization performance by the use of stochastic optimization (Lobsien et al., Nucl. Fusion, vol. 58 (10), 2018, 106013), it is demonstrated here that significant further improvements can be made – lower field errors and improved robustness – for a Wendelstein 7-X test case. This is done by increasing the sample size and applying fully three-dimensional perturbations, but most importantly, by changing the design sequence in which the optimization targets are applied: optimization for field error is conducted first, with coil shape penalties only added to the objective function at a later step in the design process. A robust, feasible coil configuration with a local maximum field error of 3.66 % and an average field error of 0.95 % is achieved here, as compared to a maximum local field error of 6.08 % and average field error of 1.56 % found in our earlier work. These new results are compared to those found without stochastic optimization using the FOCUS and ONSET suites. The relationship between local minima in the optimization space and coil shape penalties is also discussed.

Design and Optimization of Injector Structure in Diesel Engine Based on ISIGHT Platform DOE Methods

2011 ◽  
Vol 335-336 ◽  
pp. 1376-1380
Author(s):  
Xin Ying Wu ◽  
Guang Yao Ouyang ◽  
Yu Xue Li
Keyword(s):  
Design Optimization ◽  
Multidisciplinary Design Optimization ◽  
Optimization Design ◽  
Design Method ◽  
Optimization Methods ◽  
Multidisciplinary Design ◽  
Design And Optimization ◽  
Traditional Design ◽  
Improved Performance

The traditional design method of injector structure cannot meet the demand of farther improved performance,the change of modern environment demand not only the optimization of one performance but also the optimization of various comprehensive performance.iSIGHT is a multidisciplinary design optimization platform that offer a integrated designenvironment and advanced design optimization methods. The optimization design of injector structure based on design of experiment of iSIGHT platform to improve the spray quality of injector is implemented.

Wide-Base Tire-Building Process and Design Optimization Using Finite Element Analysis

2018 ◽  
Vol 46 (4) ◽  
pp. 242-259 ◽  
Author(s):  
Haichao Zhou ◽  
Guolin Wang ◽  
Yuming Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Optimization ◽  
Curved Surface ◽  
Construction Simulation ◽  
Element Analysis ◽  
Building Process ◽  
The Difference ◽  
Improved Performance ◽  
Validation Of Results

ABSTRACT The wide-base tire is a relatively new design that originated to replace dual tires because of its potential for improved performance. However, during the construction process, the wide-base tire is more likely to experience tread deformation and uneven stress distribution. The goal of this study is to incorporate numeric techniques for the construction and design optimization of a wide-base, heavy vehicle, pneumatic tire. First, four conditions of the tire (385/55R22.5)–building process, including gluing of components on the main drum, gluing of components on the auxiliary drum, green tire, and finalizing the capsule vulcanizing machine, were simulated using finite element analysis. Second, to solve the difference in the tire's (435/50R19.5) material distribution between the real manufactured structure and the theoretical structure, the curved surface drum-building method and the parameters of the curved surface drum were determined by tire construction simulation. In this article, we present the method for collecting tire material, the measurement process, the analysis method, some general results, and statistics on the wide-base tire. Finally, validation of results of the simulation and measurement are given.

A Modified Two-Step ANN Ensemble Approach to Improve Generalization and its Application in Fractal Antenna Design

2019 ◽  
Vol 29 (07) ◽  
pp. 2050106
Author(s):  
Balwinder S. Dhaliwal ◽  
Gaganpreet Kaur ◽  
Navreet Saini ◽  
Shyam Sundar Pattnaik ◽  
Simranjit Kaur Josan
Keyword(s):  
Resonant Frequency ◽  
Design Optimization ◽  
Antenna Design ◽  
Fractal Antenna ◽  
Algorithm Optimization ◽  
Step Method ◽  
Efficient Operation ◽  
Ann Modeling ◽  
Improved Performance ◽  
Selection Of

In this work, a fractal antenna with rectangular base shape has been designed for 5.2[Formula: see text]GHz resonant frequency. Recently, ANN modeling of fractal antenna parameters have shown to be an effective approach for its design optimization. But the selection of ANN ensemble members and their output aggregation are two important issues for efficient operation of ANN ensembles. A novel two-step method based on output sensitivity of ANN and genetic algorithm optimization of ensemble members has been proposed in this paper for addressing the above two issues. The proposed approach, which is a modified form of existing technique, has been first validated by applying it over six benchmark functions and compared with existing approach for improved performance. Further, the proposed approach has been used to develop an ANN ensemble for design optimization of fractal antenna at 5.2[Formula: see text]GHz resonant frequency. The selected antenna geometry has been experimentally verified and has shown significant miniaturization of 48.34% as compared to conventional rectangular micro-strip antenna.

Toward The Simultaneous Correction of Spherical and Chromatic Aberration in Electron Optics by Means of an Electrostatic Electron Mirror

1990 ◽  
Vol 48 (1) ◽  
pp. 206-207
Author(s):  
Gertrude. F. Rempfer
Keyword(s):  
Chromatic Aberration ◽  
Transverse Magnetic ◽  
Objective Lens ◽  
Ion Imaging ◽  
Corrected Image ◽  
Electric And Magnetic Fields ◽  
Chromatic Aberrations ◽  
Improved Performance ◽  
Electron Microscopes ◽  
Image Planes

Optimum performance in electron and ion imaging instruments, such as electron microscopes and probe-forming instruments, in most cases depends on a compromise either between imaging errors due to spherical and chromatic aberrations and the diffraction error or between the imaging errors and the current in the image. These compromises result in the use of very small angular apertures. Reducing the spherical and chromatic aberration coefficients would permit the use of larger apertures with resulting improved performance, granted that other problems such as incorrect operation of the instrument or spurious disturbances do not interfere. One approach to correcting aberrations which has been investigated extensively is through the use of multipole electric and magnetic fields. Another approach involves the use of foil windows. However, a practical system for correcting spherical and chromatic aberration is not yet available.Our approach to correction of spherical and chromatic aberration makes use of an electrostatic electron mirror. Early studies of the properties of electron mirrors were done by Recknagel. More recently my colleagues and I have studied the properties of the hyperbolic electron mirror as a function of the ratio of accelerating voltage to mirror voltage. The spherical and chromatic aberration coefficients of the mirror are of opposite sign (overcorrected) from those of electron lenses (undercorrected). This important property invites one to find a way to incorporate a correcting mirror in an electron microscope. Unfortunately, the parts of the beam heading toward and away from the mirror must be separated. A transverse magnetic field can separate the beams, but in general the deflection aberrations degrade the image. The key to avoiding the detrimental effects of deflection aberrations is to have deflections take place at image planes. Our separating system is shown in Fig. 1. Deflections take place at the separating magnet and also at two additional magnetic deflectors. The uncorrected magnified image formed by the objective lens is focused in the first deflector, and relay lenses transfer the image to the separating magnet. The interface lens and the hyperbolic mirror acting in zoom fashion return the corrected image to the separating magnet, and the second set of relay lenses transfers the image to the final deflector, where the beam is deflected onto the projection axis.

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