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프리캐스트 콘크리트 세그먼트의 합성섬유 보강재 적용에 따른 구조적 성능 평가
이호성,김창용,이승원,김승준,이경진,Lee, Hoseong,Kim, Changyong,Lee, Sean S.,Kim, Seungjun,Lee, Kyeongjin 한국터널지하공간학회 2018 한국터널지하공간학회논문집 Vol.20 No.2
쉴드TBM 터널의 프리캐스트 콘크리트 세그먼트 라이닝의 보강재로 철근이 주로 사용되어 왔으나, 철근 보강량을 줄이기 위하여 섬유보강재를 적용하는 연구가 진행되어 오고 있다. 세계적으로 터널 시공성을 향상시키기 위하여 강섬유보강재를 적용한 연구와 시공이 진행되어 왔으나, 터널 라이닝 방수막에 대한 펀칭, 자체 부식에 의한 내구성 및 미관상의 문제로 인하여 이에 대한 적용이 국내에서는 미뤄지고 있는 실정이며, 이에 대한 대책으로 합성섬유가 강섬유의 대체제로 주목 받고 있다. 이 연구에서는 섬유(강섬유, 합성섬유) 보강재를 사용한 프리캐스트 콘크리트 세그먼트의 파괴시험을 통하여 성능을 분석하여 현장에서의 적용 가능성을 평가하였다. 그 결과 강섬유와 합성섬유의 조합이나 합성섬유의 혼입량에 따라 보조철근의 대체가 가능한 것으로 분석되었다. Steel bars have been widely used as the primary reinforcement for Precast Segmental Concrete Lining for TBM Tunnels. Previously, studies have been carried out to gauge the potential for steel fiber reinforcement to replace the use of steel bar reinforcements in the segmental lining to reduce the amount of the steel bar reinforcement. Steel fiber reinforcements have been investigated and widely applied to SFRC TBM linings to improve the constructability of SFRC TBM linings worldwide. However, the steel fiber reinforcement often caused punctures to the water membranes inside tunnel lining and had long-term durability deterioration issues caused by steel corrosion, as well as cosmetic problems. Therefore, this paper sought to gauge the potential of synthetic fiber reinforcements, which have proven to be very attractive substitutes for steel fiber reinforcements. This study analyzed the performance of both steel and synthetic fiber reinforcements in segmental linings and evaluated the applicability of the fiber reinforcements to the TBM Precast Concrete Segmental Linings of TBM tunnels. As a conclusion, this study demonstrates that the potential use of steel and synthetic fibers in various combination, can substitute the rebar reinforcement in the concrete mix for segmental concrete linings.
고효율 자동차 전자장비 냉각 시스템 성능 향상을 위한 해석적 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),임택규(Teakkyu Lim),이대웅(Daewoong Lee),권대복(Daebok Kwon) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The aim of this study is to investigate the performance and the fluid dynamic behavior of application of proto electric device’s cooling system for high efficient vehicle in severe driving condition in terms of engine and electric devices’ cooling. In this study, optimum layout of extra heat exchanger for electric device cooling has been simulated and analyzed by 3-D thermal flow analytic software, UH3D. In spite of extra cooling system for high efficient vehicle, cooling module layout is being considered as 2 column due to confined engine room and pedestrian’s protection. For this reason, unified heat exchangers with combination of two kinds of engine/electric device and condenser/electric device were studies to find out better solution in terms of cooling performance. As results of 3D analysis, combination of condenser/electric device cooling heat exchanger is considered as the effective way for a vehicle optimum cooling module because of less influence on condenser heat rejection and more heat transfer area for engine cooling system. From further studies, such as the variation of cooling module location and interval between 2 column of cooling module, additional performance improvement for electric device cooling system seems to be achieved.
연료전지 스택 배열을 활용한 CO₂ 난방 시스템 배열열교환기 성능 특성에 관한 실험적 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),임택규(Taekkyu Lim),모지환(Jihwan Mo),김용찬(Yongchan Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The aim of this study is to investigate the performance characteristics of CO₂ Heat Pump(H/P) system using the stack cooling coolant / refrigerant heat exchanger for fuel cell electric vehicles(FCEV). The present heating system for FCEV uses PTC heater, which results in lower fuel efficiency and reduction of driving range. To cope with heating performance improvement without additional power consumption, one of possible methods is to use stack coolant heat for FCEV. Due to high pressure and temperature operating condition for CO₂, CO₂ heat pump has been concerned that it seems to cover heating capacity with the similar capacity of engine coolant heating system. Furthermore, CO₂ heating system is free of environmental regulations for a vehicle refrigerant. In this study, experiments to analyze heating performance characteristics using the coolant / refrigerant heat exchanger have been done with various operating conditions, which are likely to match the actual vehicle’s driving conditions under cold ambient conditions, such as variation of coolant flow rate and interior air temperature. Experimental results show that the heating capacity has Max. 9.5 ㎾ @ coolant temperature 60℃, interior air outlet temperature is up to 45℃ @ ambient temperature -20℃, and the capacity of the coolant / refrigerant heat exchanger is 6.5 ㎾ @ coolant temperature 60℃. From various experimental results, optimal coolant flow rate to have optimum heating performance seems to exist under a certain ambient temperature(5.0 LPM@ ambient temperature -20℃)
자동차용 Powertrain Fast Warm-up을 위한 배기열 회수 시스템 성능 특성에 관한 해석적 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),이동혁(Donghyuk Lee),허형석(Hyungseok Heo),김용찬(Yongchan Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The aim of this study is to investigate the performance of powertrain fast warm-up using exhaust heat recovery system in cold ambient driving condition. As fuel efficiency improvement in cold ambient condition is mainly concerned, one of possible technologies to improve fuel efficiency is to reduce engine coolant and ATF warm-up time, which there is growing concern about exhaust heat recirculation system. In this study, simulations on optimal layout to reduce powertrain warm-up time using exhaust heat recovery system(heat exchanger between engine coolant and exhaust gas, ATF warmer) were performed by 1D code, KULI. As a result, when ATF warmer and heater core are arranged in a row, there is concerned about effective layout to shorten warm-up time using heated engine coolant through exhaust heat recovery module. Furthermore, cabin room temperature side would be relatively favorable as well. Heated engine coolant distribution for ATF warmer and heater core was analyzed 80% and 20% to cope with warm-up performance. When these simulation was compared to test results on the road(Cold FTP Mode), similar tendency was found quantitatively.
하이브리드 차량용 통합 냉각시스템 성능 평가 및 해석적 연구
이호성(Hoseong Lee),원종필(Jongphil Won),김성철(Sungchul Kim),이동혁(Donghyuk Lee),김현철(Hyun Chul Kim),이대웅(Daewoong Lee),권대복(Daebok Kwon) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The aim of this study is to evaluate the performance of integrated engine/motor cooling system and analyze the battery/inverter cooling system for hybrid electric vehicles(HEV). The prototype integrated radiator for engine/motor cooling was fabricated and the performance was evaluated on the optimum test rig with the variation of coolant flow rate and air inlet velocity. Electrical device cooling system, such as motor and controller, needed to be maintained under 50℃ for thermal stability. Under the certain condition, which inlet temperature difference(ITD) between air and coolant is 20℃, optimum coolant flow rate for electrical device cooling radiator was 10 LPM with heat capacity, 4.5㎾ at air inlet velocity 4㎧. The analysis of the battery/inverter cooling system has been peformed by applying the computational fluid dynamics (CFD) code to investigate fluid dynamic behavior characteristics and effectively design air flow rate of the system for hybrid electric vehicles (HEV). As a result, at design operating condition, air flow rate of the battery/inverter cooling system was 218.0 ㎥/h and the corresponding efficiency of the blower motor was predicted about 70.7%. Furthermore, for the battery/inverter cooling system, the average temperature of the battery was about 42.4℃.
연료전지 스택 배열을 활용한 CO₂ 난방 시스템 성능 특성에 관한 실험적 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),이무연(Mooyeon Lee),정영철(Youngchul Jung),모지환(Jihwan Mo),김용찬(Yongchan Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The aim of this study is to investigate the performance characteristics of CO₂ Heat Pump(H/P) system with stack coolant heat source for fuel cell electric vehicles(FCEV) under various operating conditions. The present heating system for FCEV uses PTC heater, which results in lower fuel efficiency and reduction of driving range. To improve heating capacity without additional power consumption, one of possible methods is to use stack coolant wasted-heat for FCEV. Due to high pressure and temperature operating condition for CO₂, CO₂ heat pump has been concerned that it seems to cover heating capacity with the similar capacity of engine coolant heating system. Furthermore, CO₂ heating system is free of environmental regulations for a vehicle refrigerant. In this study, experiments to analyze heating performance characteristics with stack coolant heat source have been done with various operating conditions, which are likely to match the electric H/P system operating conditions under cold ambient conditions, such as variation of compressor speed and interior air temperature. Experimental results show that stack coolant temperature needs more than 50℃ to have required heating capacity 6.0 ㎾ @ interior air inlet temperature, -20℃ under the rated electric compressor speed 4,000 rpm. From various experimental results, operating conditions to have optimum heating performance with stack coolant heat recovery under various interior air condition, such as the stack coolant temperature and the compressor speed, were found.