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초음파 시험법에 의한 실존 콘크리트 구조체의 압축강도 추정식에 관한 연구
권영웅,유재은,신정식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
This study concerns the new strength equation of concrete by ultrasonic pulse velocity test. There are not only few estimate strength equations of concrete by nondestructive test, but also many problems to apply them because of time, cost, easiness, structural damage, reliability and so on. For this study, there performed a series of test and proposed a equation as follows ; Linear : fck = 70.57Vp - 222.9, r²=91.3% Quadratic : fck = 19.868Vp² - 76.6Vp + 48.1, r²=91.7% here, fc estimated compressive strength of concrete by MPa Vp : Ultrasonic Pulse Velocity of concrete by km/sec.
초고성능 콘크리트 I형 거더의 휨 전단강도에 대한 해석 연구
권영웅,변남주,이정화,한상윤,강영종 한국복합신소재구조학회 2017 복합신소재구조학회 학술발표회 Vol.2017 No.04
This study investigates the flexural shear strength of ultra high performance concrete I-girder. The effect of aspect ratio on the flexural - shear strength of UHPC was analyzed using finite element analysis. The UHPC I-type girder was modeled using 3D shell elements and analyzed using geometric and material nonlinear analysis. The boundary condition is simple support condition and a displacement load is applied to the center of the upper flange. The results shows that shear strength decreased as the aspect ratio increased and the bending-shear failure of UHPC I-girder does not occur even at larger moment than ordinary concrete due to the cross-linking action of steel fiber.
가솔린기관의 냉시동시 촉매 가열 촉진을 위한 점화시기 영향에 대한 실험적 연구
권영웅,함성훈 한국기계기술학회 2011 한국기계기술학회지 Vol.13 No.4
On cold start operation of an SI engine, a catalyst shows poor performance before it reaches activation temperature. Therefore, fast warmup of the catalyst is very crucial to reduce harmful emissions. In this study, an appropriate control strategy is investigated to increase exhaust gas temperature through changes of spark timing. Combustion stability is also considered at the same time. Exhaust gas temperature and pressure of combustion chamber are measured to investigate the effects of spark timings on cold start and idle performance. Experiments showed that retarded spark timing promotes the combustion at the end of expansion stroke and increases exhaust gas temperature during cold start.
구배반응 무단변속기를 탑재한 소형 전기차량의 주행 성능시험
권영웅,김만재 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.5
In this study new Continuously Variable Transmission system which is adaptable to a small size electric vehicle is proposed available to gradient response Continuously Variable Transmission. New pulleys consist of springs adapted driving pulley and driven pulley. At the moment a small electric vehicle drive a slope, new system respond to a gradient as overcoming tensional force of springs. We made prototype of gradient response Continuously Variable Transmission to test travelling performance. In the travelling performance test, the small electric vehicle with gradient response Continuously Variable Transmission get improved perfomance than the small electric vehicle with reduction gear.