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배태성(Tae-Sung Bae),이권희(Kwon-Hee Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This study proposes the shape optimization of manifold valve. Structure analysis performs to find Max. stress and weight of a fully closed manifold valve. In this study, the kriging interpolation method is adopted to obtain the minimum weight satisfying the strength constraint. Optimum designs are obtains by ANSYS Workbench and the in -house program, EXCEL-kriging program. Kriging metamodels setting Max. stress and weigh as response is generated for the shape optimization of manifold valve. Sample point is generated by latin-hypercube design. Kriging metamodels is proved the reliability in structure analysis. When safety factor is 1.5, optimum solution is found:
황승진,김규철(K.C. Kim),김기혁(K.H. Kim),장성철(S.C. Jang),김영주(Y.J. Kim),우남섭(N.S. Woo) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This study have goal with conceptual design for Offshore Structures of high pressure control valve for localization. Gate valve for development accomplished with flow analysis based on provision of ANSI B16.34, ANSI B16.10, ANSI B16.25 In order to localize the Offshore Structures high pressure control valve. Flow decrease observed open valve that equal percentage flow paten which is general inclination of ball valve. Relation with flow and flow coefficient can not be proportional according to inlet pressure when compare with mass flow rate. Because flow coefficient have influence in flow and pressure difference. Namely, flow can be change even if it has same Cv value. The structural analysis used ANSYS which is a commercial code. Stress analysis result of internal pressure in valve showed lower than yield strength. This is expect to need more detail design and verification for stem and seat structure.
이중연료 엔진의 급기 매니폴드에서 발생하는 폭발사고에 관한 가스유동 해석
리창창,김종환,공경주,고대권 한국동력기계공학회 2022 동력시스템공학회지 Vol.26 No.5
이중연료 엔진은 LNG를 연료로 사용하기 때문에 기존의 디젤엔진에 없던 위험 요소가 존재한다. 이러한 위험 요소에 대처하고 폭발사고를 방지하기 위한 시스템이 적용되고 있으며, 그중에서 급기 매니폴드에서 발생하는 폭발사고에 관해 가스유동 해석을 사용하여 분석하였다. 연구 대상으로 급기 매니폴드에서 폭발사고가 발생하였을 경우, 압력 상승 및 화염 전파의 특성에 대해 분석하였다. 그리고 대처방안으로 폭발 릴리프 밸브를 설치하여 설치 위치 및 수량에 대해 분석하였다. 폭발 릴리프 밸브를 한 개 설치하였을 경우는 안전 압력 이상으로 압력이 상승하였기 때문에 폭발사고에 대처할수 없었다. 하지만, 폭발 릴리프 밸브를 두 개 설치한 경우는 안전 압력 이상으로 압력이 상승하지 않았다. 이중연료 엔진의 급기 매니폴드에서 발생하는 폭발사고를 대처하기 위해서는 급기 입구 하단과 급기 매니폴드의 닫힌 끝단에 각 한개씩 총 두 개의 폭발 릴리프 밸브를 설치하는 것이 적합한 방법이라 생각한다.
이성민(Seong-Min Lee),도정환(Jeong-Hwan),지상연(Sang-Yeon Ji),김철웅(CheulWoong Kim),이준성(Junseong Lee),임석희(Seokhee Lim) 한국추진공학회 2022 한국추진공학회 학술대회논문집 Vol.2022 No.5
본 논문에서는 미래 발사체 재사용 요소기술 선행연구를 위해 제작 중인 1톤급 수직이착륙 시연체의 압력제어를 통한 가압성능시험을 수행하였다. 개발 중인 시연체는 가압제어를 위하여 매니폴드형 솔레노이드 밸브를 이용하여 가압제어를 하는 시스템으로 구성하였다. 탱크 후단에서 배출되는 유량에 따라 추진제 탱크 내부의 압력을 일정하게 유지하는 가압 성능시험 방법을 수행하였다. 결과적으로 추진제 탱크 내부의 일정한 가압을 위한 압력제어 성능은 확인하였으며, 이후 시스템별 성능 검증을 위한 단계별 시스템 검증을 수행할 계획이다. In this paper, the performance test of the pressure control pressurization system of the 1 ton class vertical take-off and landing demonstrator being manufactured for the prior research on the element technology for the reuse of the future launch vehicle was performed. The demonstrator under development is composed of a system that controls pressure using a manifold-type solenoid valve for pressure control. A pressurization performance test method was performed to keep the pressure inside the propellant tank constant according to the flow rate discharged from the rear end of the tank. As a result, pressure control performance for constant pressurization inside the propellant tank was confirmed, and thereafter, step-by-step system verification is planned to verify the performance of each system.
GT-Power를 이용한 흡기 매니폴드 및 밸브 타이밍 최적화에 관한 연구
노종원(Jongwon Noh),김충식(Choongsik Kim),민선기(Sunki Min),이중구(Chonggoo Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper describes the optimization methodology of intake manifold geometry and valve timing by using 1D CFD and DOE. Since the engine performance is highly affected by intake manifold and valves, we have to determine appropriately the design parameters of intake manifold geometry and the valvetrain system. Among the design parameters are plenum volume, runner length, runner diameter for intake manifold and the valve timing and durations for valvetrain system. For these design parameters are closely coupled in their impacts on engine performance, 1D CFD virtual engine simulation can be used efficiently and effectively to predict engine performance with regard to various design change. In this research, 1D CFD and DOE was used to determine appropriate intake manifold geometry and valve timing before prototype components machining. Genetic Algorithm was used to get the optimized manifold geometry and valve events. Simulation results showed that intake valve timings were varied by about 20 cam angle according to the engine speed while the exhaust events were varied within 5 cam angle at the engine speeds higher than 2200rpm. Also, the engine performance was predicted to be improved by the late intake valve events to a great extent. Finally, up to 13% of the output increase could be achieved through the optimization of the intake manifold and valvetrain.
차량용 연료전지 동특성 모델을 이용한 공기 공급계 압축기 서지 연구
한재영(Jae Young Han),탁현우(Hyun Woo Tak),김경택(Kyung Teck Kim),유상석(Sang Seok Yu) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In automotive fuel cell system, air compressor or blower is used to deliver the air into the fuel cell system. Different from industrial compressor, the compressor of automotive fuel cell requires severe dynamic performance. Since the air flow rate with compressor should cover wide range of operating conditions, it is necessary to understand operating trajectory of compressor. In this study, the automotive fuel cell system with compressor is developed so that the trajectory of air flow rate on compressor map can be indicated. Since the fuel cell stack model is already developed before this study, the dynamic simulation model is focused. The manifold dynamics of supply and return line are included to investigate the surge phenomena and to investigate the operating strategy of control valve to avoid the surge. The discharge coefficient of control valve is a parameter to understand the surge phenomena under load following conditions. As a result, control strategies of inlet and outlet valve are discussed.