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A Study on the Multi-Objective Optimization of Impeller for High-Power Centrifugal Compressor
강현수,김윤재 한국유체기계학회 2016 International journal of fluid machinery and syste Vol.9 No.2
In this study, a method for the multi-objective optimization of an impeller for a centrifugal compressor using fluid-structure interaction (FSI) and response surface method (RSM) was proposed. Numerical simulation was conducted using ANSYS CFX and Mechanical with various configurations of impeller geometry. Each design parameter was divided into 3 levels. A total of 15 design points were planned using Box-Behnken design, which is one of the design of experiment (DOE) techniques. Response surfaces based on the results of the DOE were used to find the optimal shape of the impeller. Two objective functions, isentropic efficiency and equivalent stress were selected. Each objective function is an important factor of aerodynamic performance and structural safety. The entire process of optimization was conducted using the ANSYS Design Xplorer (DX). The trade-off between the two objectives was analyzed in the light of Pareto-optimal solutions. Through the optimization, the structural safety and aerodynamic performance of the centrifugal compressor were increased.
강현수 한국도시연구소 1995 도시연구 Vol.- No.1
This paper aims reviewing theories of restructuring approach, especially that of metropolitan economic restructuring about which has been much concemed in the westem space research society since 1980's. This paper consists as thus. Firstly, I start with reviewing various theoretical trends about the metropolitan restructuring. Secondly, I try to illustrate major trends and thends and their causes of economic restructuring in metropolis. Thirdly, I analyze the theory focused on those trends and causes within the econmic flexibilization and development of informational technology. Fourthly, I focus on the social polarization and dual urbanization as a general trend in the world major cities. Finally, I try to apply these theories into Korean urbam studies and figure out the implication.
강현수,박범 대한안전경영과학회 2015 대한안전경영과학회지 Vol.17 No.4
According to the statistics, occupational fatal injuries by mobile cranes were about 12 per year in whole industrial. Mobile cranes are widely used in various parts of industries to improve the efficiency of the work. However considerable number of fatal injuries happen each year during the operation of the machines. In this study, the current regulations to be adequate in industrial site have to be renew in order to prevent the fatal injuries by mobile cranes. Fatal injury analyses were conducted with several accident cases by the mobile cranes. For each accident, the causes of the injuries were examined and proper safety measures were proposed. In this study, the mobile crane showed a high fatality rate in industrial accidents and no detailed cause analysis of fatal accidents was conducted in terms of unsafe acts or conditions. This study proposed a revision of the standard guideline as an accident prevention measures through in-depth analysis of fatal accidents. First, among the mainly five machines caused the accidents, mobile crane was higher for the second showed 0.6% for number of fatalities compared to number of mobil cranes and for the third showed 11% for number of fatalities compared to number of injuries. Second, main cause of cognitive engineering agenda was visibility, responsibility, affordance. As the measures to prevent accidents before starting operation, alternative revision for the fool proof including visibility, responsibility, affordance etc. for the fool proof measures was proposed. Third, alternative revision as cognitive accident prevention for the fail safe measures was proposed.