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캠과 크랭크 신호 분석에 의한 기통별 기밀도와 점화 이상 기통의 검출
김인태(Intae Kim),박경석(Kyoungsuk Park),심범주(Beomjoo Shim),황혁연(Hyeokyeon Hwang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Compression pressure of individual cylinder has big influence on engine performance parameters such as combustion pressure, indicated mean effective pressure (IMEP), emission, vibration, combustion noise and many other combustion parameters. Conventional method to check compression pressure uniformity is done by mechanical pressure gage and this method needs to disassemble related parts such as glow or ignition plugs which causes cost and time. Also this conventional method causes inaccuracy of cylinder pressure measurement because of different cranking speed results mainly from battery status and lubrication oil temperature. In order to detect misfired cylinder, conventional method is to check the root cause for each cylinder. New method to evaluate cylinder compression pressure uniformity and to detect misfired cylinder through analysis of CAM and crank sensor signal in this study. Results, high accuracy of misfired cylinder detection and evaluation of compression pressure uniformity by new method was observed.
기관의 압축 압력 누설이 모터링시 시동 모터 소요 동력에 미치는 영향성 평가
김인태(Intae Kim),박경석(Kyoungsuk Park),심범주(Beomjoo Shim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Compression pressure of individual cylinder and valve timing have big influence on engine performance parameters such as combustion pressure, indicated mean effective pressure (IMEP), emission, vibration, combustion noise and many other combustion parameters. Conventional method to check compression pressure uniformity is done by mechanical pressure gage and this method needs to disassemble related parts such as glow or ignition plugs. Also this conventional method causes inaccuracy of cylinder pressure measurement because of different cranking speed results mainly from battery status and lubrication oil temperature. This study describes and suggests new methodology to measure compression pressure by analysis of start motor current during cranking with high accuracy and without mechanical pressure gage or parts disassemble. Results, it is found that detection of bulky as well as small leaky cylinder is possible by cranking motor current analysis with high sensitivity.
모터링시 캠과 크랭크 센서 신호 분석에 의한 기관의 압축 압력 균일도 분석
심범주(Beomjoo Shim),박경석(Kyoungsuk Park),김인태(Intae Kim),이형준(Hyungjun Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Compression pressure of individual cylinder has big influence on engine performance parameters such as combustion pressure, indicated mean effective pressure (IMEP), emission, vibration, combustion noise and many other combustion parameters. Conventional method to check compression pressure uniformity is done by mechanical pressure gage and this method needs to disassemble related parts such as glow or ignition plugs which causes cost and time. Also this conventional method causes inaccuracy of cylinder pressure measurement because of different cranking speed results mainly from battery status and lubrication oil temperature. This study describes and suggests new methodology to measure compression pressure by analysis of CAM and crank sensor signal during cranking with high accuracy but without mechanical pressure gage or parts disassemble. Results, it is found that leak of cylinder has linear relationship with crankshaft angular speed during compression stroke so that cylinder leak can be detected by CAM and crank signal.
가변형 터보차저(VGT)적용 HSDI 디젤 엔진의 급감속시 서지(Surge) 개선을 위한 시험적 연구
심범주(Beomjoo Shim),박경석(Kyoungsuk Park),이창학(Changhak Lee),김인태(Intae Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Specific power output of modern HSDI diesel engine with common rail injection system has been increasing since it was applied to passenger car. With this market requirement and stringent emission / CO₂ regulation, Variable Geometry Turbine (VGT) is almost essential component for HSDI diesel engine replacing Waist Gate Turbine (WGT) in order to increase intake air charging capability and to decrease pumping loss. This high air charging performance of VGT, however, needs precise and prompt control to prevent compressor surge which can damage VGT itself and cause abnormal noise especially if intake throttle flap is applied to increase EGR rate or for Diesel Particulate Filter (DPF) regeneration control. This study describes Engine Management System (EMS) control strategy to prevent compressor surge during abrupt deceleration using interactive control method between VGT, EGR, intake throttle flap and fuel injection control minimizing effect on emission and vehicle dynamic performance. As indication of compressor surge during pedal-off phase, trace of intake air mass flow was evaluated under various intake throttle flap position, EGR valve opening and VGT vane position. Air mass flow of each case was evaluated by compressor characteristic map based on corrected air mass flow and compressor pressure ratio.
산간 계곡의 지하배수관 설치에 따른 벼 냉수피해 사례분석
심교문 ( Kyomoon Shim ),정명표 ( Myungpyo Jung ),김용석 ( Yongseok Kim ),최인태 ( Intae Choi ) 한국농림기상학회 2015 한국농림기상학회지 Vol.17 No.3
산간지역의 계곡 물길의 매립과 지하배수관의 설치에 따른 인근 논에서 벼 냉수해에 대한 민원이 제기되어 벼 냉수해와 지하배수관 설치의 연관성 유무을 파악하기 위해서 현장조사 및 분석을 실시하였다. 결론적으로 지하배수관 설치로 인하여 계곡물의 온도가 지하배수관 설치 전보다 0.5~4.5℃ 범위로 낮아진 것으로 분석되었고, 이 냉수를 농업용수로 관개한 하류쪽 논에서는 벼 냉수해가 발생할 가능성이 매우 높았을 것으로 판단되었다. 따라서, 적절한 수온상승 조치를 취하지 않으면 냉수해로 인하여 정상적인 수확이 불가능할 것으로 평가되었다. The complaint was filed for the cold water damage to rice in accordance with the installation of buried drain pipes in the mountainous areas of the valley. Field research was conducted in order to identify and analyze relevance of cold water damage to rice with underground drain pipe installation. In conclusion, water temperature was analyzed by 0.5 to 4.5℃ lower than before the installation of underground drain pipes, so the cold water damage to rice was likely to occur at the rice paddy field using cold water passing through the underground drain pipe. Therefore, the rice harvest was estimated to be impossible without appropriate measures of water temperature rise such as use of small unshaded warming basins, before water is applied to fields.
다단 방사형 섬유상 여재를 활용한 강우시 하수월류수 처리에 관한 연구
김희진 ( Heejin Kim ),심인태 ( Intae Shim ),김형준 ( Hyungjun Kim ),홍봉창 ( Bongchang Hong ),황태문 ( Tae-mun Hwang ) 한국수처리학회 2021 한국수처리학회지 Vol.29 No.1
A novel multi-fiber media filtration process was developed to treat pollutants in combined sewer overflow (CSO) effluents under a natural flow rate (12 m/hr). Most conventional CSO filtration processes operate in an upward flow, resulting in low filtration efficiency and high operating cost. In this multi-fiber filtration process, we used a horizontal filtration method with radial flow from the center of the multi-fiber medium. The fibers and filtration efficiencies were characterized using various techniques. The fibers exhibited a surface charge of -29.5 mV. The fibers’ filtration performance was evaluated under pilot-scale conditions (Q=22.5 ㎥/day) with mixed raw water amd final discharged water in an existing sewer treatment plant. In the pilot experiment, the average particle sizes for influent and effluent were 21.4 ㎛ and 4.45 ㎛, respectively, while the removal efficiency of BOD, COD, TOC, and SS was 82.9%, 77.9%, 50.1%, and 86.1%, respectively. These results are consistent with the sieving effects and electrostatic effects between fibers and pollutants. From these results, we can infer that this novel multi-fiber filtration process has the potential to treat CSO.
이현우(Lee,Hyunwoo),심현철(Shim,Hyeoncheol),임지영(Lim,Jiyoung),정인태(Jung,Intae),박윤미(Park,Yoonmee),이선주(Lee,Seonjoo),김현정(Kim,Hyeonjung),허수민(Heo,Sumin),김현수(Kim,Hyunsoo) 한국고고학회 2024 한국고고학보 Vol.- No.131
경주 쪽샘 44호분은 금관총 시기의 적석목곽묘로, 그 피장자는 10세 전후의 신라 왕실 여성으로 추정된다. 주인공의 머리맡 석단에서 비단벌레가 사용된 심엽형장식과 보요부반구형장식이 다수 출토되었다. 이들 장식과 유사한 장식이 경산 임당 5A호분 안금구 주변에서 출토된 점, 중앙에서 흑칠 안교목의 일부가 확인된 점 그리고 유기물 분석 결과를 토대로 장니와 장니장식구임을 밝혔다. 장식구에 수착된 직물과 흑칠 틀에 부착된 유기물을 분석하여, 흑칠 목제틀 하판 – 평직 마직물 - 죽제 평직 편조물 – 평직 마직물 – 평직 견직물[絹] – 적색의 능직 견직물[綺] – 흑칠 목제틀 상판 순서로 구성된 장니의 본체를 복원하였다. 심엽형장식과 보요부반구형장식은 십자상으로 조합되어 주 문양을 구성하는데, 綺의 색조와 능형문이 더해져 화려함이 극대화되었다. 장니에는 못이 전혀 사용되지 않고 실과 매듭으로 고정하였으며, 전체적으로 보요장식이 돌출되어 있어 파손되기 쉽다. 이에 실사용이 불가능하며, 공반된 입주부운주 역시 마찬가지이다. 이들 마구는 모두 의례를 위해 제작된 명기로, 무덤 내 제사에 사용되었다. 복원된 장니는 고고학 전문가와 유기물, 복식, 칠, 금공 전문가들과의 융복합 연구의 결과물로, 우리가 눈으로 볼 수 있는 고고유물의 분석에서 한 걸음 더 나아가 마이크로 아케올로지 연구의 필요성과 학제간 융복합연구의 중요성을 보여 준다. Tomb No. 44 of the Jjoksaem site is a wooden chamber tomb with a stone mound that belongs to the same period as Geumgwanchong Tomb, and the buried individual is presumed to be a royal woman (princess) of Silla around the age of 10. A number of leaf-shaped decorations using jewel beetle wings and hemispherical decorations with round pendants were excavated from the stone structure near the head of the deceased’s head. As decorations similar to these decorations have been excavated around a saddle at Imdang Tomb 5A in Gyeongsan, as a part of a black painted saddle was found in the center of this area, and based on the results of organic material analysis, it was established that these decorations originally adorned a saddle flab. By analyzing the fabric attached to decora-tions and the organic matter attached to the black lacquered frame, the following parts of the main body of the saddle flap were identified and restored: the lower plate of the black lacquered wood frame, plain hemp fabric, plain bamboo fabric, plain hemp fabric, plain silk fabric, red colored twilled silk fabric, and the upper plate of the black lacquered wood frame. The leaf shaped decorations and hemispherical decorations with round pendants were combined in a cross shape to form the main pattern, and their splendor was maximized by adding red purple colour and silk twill fabric. Nails were not used at all for this saddle flap; components were fixed with threads and knots. The decorations with round pendants protrude, making them easy to break. Therefore, the saddle flap is impossible to use when riding a horse, and the same applies to the decorations of the saddle breech. Such horse harnesses therefore appear to have been used for rituals, particularly for ancestral rites in the tomb. The restored saddle flap is the result of interdisciplinary and convergence research between archaeological experts and experts in organic matter, clothing, lacquer, and gilt-bronze. This case demonstrates the necessity of micro-archaeological research and the importance of interdisciplinary and convergence research, allowing research to go one step further beyond the analysis of archaeological objects done with the naked eye.