• Title/Summary/Keyword: 재시동 조건

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T-50 Engine Airstart Test (T-50 엔진 공중재시동 시험)

  • ;;Park, Seon-Uk;Jeong, In-Myeon;Lee, Sang-Baek
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.2
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    • pp.90-95
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    • 2006
  • For single engine application like T-50, advanced supersonic jet trainer, airstart capability is very important. This paper presents the results of airstart tests performed to verify T-50 airstart capability for various flight condition. The tests include spooldown, APU assisted and auto-relight airstart tests. Except for the auto-relight tests T-50 engine was successfully restarted for all airstart tests. After modifying FADEC flameout detection schedule, auto-relight tests also were successfully demonstrated. Through T-50 engine airstart tests excellent T-50 airstart capability was validated.

A Study on Improvement of Genetic Algorithm Operation Using the Restarting Strategy (재시동 조건을 이용한 유전자 알고리즘의 성능향상에 관한 연구)

  • 최정묵;이진식;임오강
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.15 no.2
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    • pp.305-313
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    • 2002
  • The genetic algorithm(GA), an optimization technique based on the theory of natural selection, has proven to be relatively robust means to search for global optimum. It is converged near to the global optimum point without auxiliary information such as differentiation of function. When studying some optimization problems with continuous variables, it was found that premature saturation was reached that is no further improvement in the object function could be found over a set of iterations. Also, the general GA oscillates in the region of the new global optimum point so that the speed of convergence is decreased. This paper is to propose the concept of restarting and elitist preserving strategy as a measure to overcome this difficulty. Some benchmark examples are studied involving 3-bar truss and cantilever beam with plane stress elements. The modifications to GA improve the speed of convergence.

Configuration and Ground Tests of Solar Cell and Fuel Cell Powered System for Long Endurance UAV (장기체공 무인기용 태양전지-연료전지를 활용한 동력원 구성 및 지상시험)

  • Park, Byeongseob;Kim, Hyuntak;Baek, Seungkwan;Kwon, Sejin
    • Journal of the Korean Society of Propulsion Engineers
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    • v.19 no.4
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    • pp.94-101
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    • 2015
  • Each of power systems of solar cell and fuel cell were configured and validated for long endurance UAV, as the preliminary research for the integration of power systems. Solar power system consisted of solar modules fabricated by solar cells of Sunpower's C60, commercial solar MPPT controller and Li-po battery, and then was validated. The re-start characteristics of hydrogen production from $NaBH_4$ hydrolysis was validated for operating the commercial fuel cell. The average voltage drop of Li-po battery in solar power system was -2.9 V/hour. The performance of re-start characteristics of $NaBH_4$ hydrolysis was stable in sequence mode of mission profile. Each of single systems were satisfied for the proposed mission profile.

Safety-Related Bus Voltage Variation during Large Induction Motor Start-up in 1400MW Light Water Reactor Type Nuclear Power Plant (1400MW급 경수로형 원자력발전소의 대용량 유도전동기 시동시 안전관련 모선 전압 변동)

  • Lee, Cheoung Joon;Kim, Chang Kook;Noh, Young Seok;Joo, Young Hwan
    • Plant Journal
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    • v.12 no.4
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    • pp.37-43
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    • 2016
  • Power system which provides electricity to the accident mitigation load for nuclear power plant should be verified to maintain the proper voltage level under the various loading and source conditions. For this purpose, it was needed to collect the voltage data of safety related buses during operation of the Reactor Coolant Pump(RCP) motor and Component Cooling Water Pump(CCWP) motor, respectively, under the certain loading condition of the plant. The data (such as, voltage, current, power factor) collected from actual measurement were used to modify the existing ETAP model and then the reanalysis was conducted to simulate the testing conditions. Through these actual measurement and analysis, it ensures that the existing electrical system analysis including assumptions and methods was conducted properly. Finally, the voltage of safety related buses was not dropped below the acceptable level, and the discrepancy between two results was within the limit.

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An Analysis on Plume Behaviour of Rocket Engine with Ground Condition at High Altitude Engine Test Facility (고공시험설비에서 로켓엔진의 지상시험 플룸 거동 해석)

  • Kim, Seong-Lyong;Lee, SeungJae;Han, YoungMin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.112-115
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    • 2017
  • We analyzed the rocket engine flow to check whether the possibility of the ground test and the equipment safety problems in the high altitude engine test facility. The test condition is that the vacuum chamber is open and the coolant water is injected into the supersonic diffuser. The analysis uses two-dimensional axisymmetry with a mixture of plume, air, and cooling water. As a result, the ground test was possible up to the cooling water flow rate of 200 kg/sec. However, due to the back flow of the initial plume, the vacuum chamber is exposed to high temperature, and at the same time, the inside of the vacuum chamber is contaminated due to the reverse flow of the cooling water. Therefore, sufficient insulation measures and work for pollution avoidance should be preceded.

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Development Status of Technology Demonstration Model for Staged Combustion Cycle Engine (다단연소사이클 엔진 기술검증시제 개발 현황)

  • Kim, Chaehyoung;Lee, Jungho;Woo, Seongphil;So, Younseok;Yi, SeungJae;Lee, Kwang-Jin;Cho, Namkyung;Han, Yeoungmin;Kim, Jin-han
    • Journal of the Korean Society of Propulsion Engineers
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    • v.23 no.4
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    • pp.104-111
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    • 2019
  • Staged combustion cycle engines exhibit higher combustion performance compared with open cycle engines with a gas generator. An advanced research of the staged combustion cycle engine is going on for the next program following the KSLV-II program. Various experiments have been carried out for the technology demonstration model, TDM0A and TDM0B. The experiments on the combustion performance are aimed to understand the engine start condition and combustion characteristics. They also aim to develop the oxidizer-rich pre-burner and the combustor of the staged combustion cycle engine. The engine-shaped model, TDM1A is fabricated based on the experimental data. The combustion experiment of the TDM1A shows that the combustion pressure of the combustor is approximately 91 bar and the turbine rotation is approximately 28,00 rpm. The result is stable and satisfies the development requirements. The present paper reports on the development process and characteristics of engine models from TDM0A to TDM1A.