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박민철(Park Minchul),김성구(Kim Seonggoo),곽노경(Kwak Nokyung),신효희(Shin Hyohee),이송(Lee Song) 한국지반환경공학회 2011 한국지반환경공학회논문집 Vol.12 No.1
급속한 경제발전시기에는 하천공사 시 유해한 재료를 사용함으로써 환경오염으로 인한 인간 및 동식물에 악영향을 끼치는 사례가 많이 발생하였다. 이를 복구하는 시간 및 비용이 많이 소요되는 실정이다. 따라서 본 연구에서는 하천공사 중의 차수공사시 환경오염 문제점을 극복할 수 있는 친환경적이면서 경제적으로 저렴하고, 장기적으로 사용할 시 내구성에 문제없는 공법을 적용하고자 실내모형실험결과와 현장실험결과를 비교?분석하였다. 실내실험결과 콘크리트 포장재, 아스팔트 포장재, 벤토나이트 매트, 고화토공법, 혼합토공법은 적은 침투량을 나타내었고, 이와 반대로 다짐흙, 초지, 투수성 포장재는 많은 양의 침투량이 발생되었다. 현장투수실험결과는 실내실험투수결과와 비슷한 경향을 나타냈으며, 국내차수시설 투수기준인 1.0×10<SUP>-7</SUP>㎝/sec 이하에 모두 만족하였다. 또한, 일축압축강도는 1.0㎫ 이상 결과값을 얻어 기준에 만족하였고, 다짐도가 증가할수록 일축압축강도는 증가하고 투수계수는 감소하는 경향을 확인할 수 있었다. In period of rapid economic development, as doing river conservation work by using harmful materials environmental pollution has adversely effected humans, animals and plants frequently. For recovery of environmental pollution it needs a lot of time and cost. Therefore, in this study, in order to take an environment-friendly method which is also economical and durable both results of the laboratory model test and field test were compared and analyzed. According to the results of the laboratory model test, those methods such as concrete paving, asphalt paving, bentonite mat, stabilized soil method and mixed soil method have small amount of seepage, but on the other hand compaction soil, grassland and permeable materials have considerable amount of seepage. The results of field test show a similar tendency with laboratory test and have been satisfied to assess standard of domestic water permeability below 1.0×10<SUP>-7</SUP>㎝/sec and unconfined compressive strength is also than 1.0㎫ so it has been satisfied about standard. In conclusion, as compaction rate increased, as unconfined compression strength increased and coefficient of permeability decreased.
알루미늄 고진공 다이캐스팅 공법을 적용한 전륜 서브프레임 개발
윤석진(Sukjin Yoon),김성구(Seonggoo Kim),김규록(Gyurok Kim),정의근(Euikeun Jeong),이용욱(Yonguk Lee),조영건(Younggun Cho) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In the automobile industry, many parts are manufactured by applying aluminum materials to improve fuel efficiency and reduce vehicle weight. In particular, in order to design and manufacture future electric vehicles, the weight reduction of vehicles is receiving more and more challenges. In the case of a suspension part, since it is located in the lower part of the vehicle, it has a great advantage of improving fuel economy due to weight reduction. This paper describes the development stage of a front wheel subframe with a welded structure of aluminum high vacuum die casting method and extrusion method. The result of the aluminum subframe study showed that the weight was reduced by 5.6㎏ and natural frequency was improved by 16㎐ compared with the steel subframe.
윤석진(Sukjin Yoon),이계호(Kyeho Lee),김성구(Seonggoo Kim),정현진(Hyunjin Jung),김정(Jung Kim),이지현(Jihyun Lee) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
An Automotive front cross member supports many crucial components and systems, such as an engine, transmission, and suspension. Important performance measures for the design of a front cross member include durability, stiffness, and NVH, while minimizing weight of primary concern. This paper presents an effective and efficient methodology for front cross member design from conceptual design to detailed design using design optimization.
채홍윤(Hongyun Chae),정홍래(Hongrae Jeong),안희태(Heetae Ahn),손준형(Junhyeong Sohn),김성구(Seonggoo Kim),황한영(Hanyoung Hwang),김진성(Jinsung Kim) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The stiffness of subframe has a great effect on the NVH of vehicle. Usually, dampers are applied to subframe for NVH improvement. But it is inefficient because it excessively increases the weight of vehicle. It is necessary to improve stiffness while minimizing the weight gain of subframe. For this, we conducted the topology optimization and got the load path of subframe. We analyzed the load path and eliminated unnecessary parts to reduce weight. Structural important parts were reinforced to increase stiffness. It resulted in 0.3㎏ increase in the weight of subframe and 20.8㎐ increase in the natural frequency. In this study, We propose the method that improved the stiffness while minimize weight of subframe.
백승진(Seungjin Baek),이계호(Kyeho Lee),신준섭(Junseob Shin),박민수(Minsoo Park),김성구(Seonggoo Kim) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
Torque control and angle control are used as automotive chassis parts tightening method. In general, torque controlled tightening method is used in elastic range and angle controlled tightening method is used in plastic range of bolts. This paper describe experimental analysis of bolt axial force scatter by ultrasonic bolt tension measurement about torque control and angle control in elastic range of bolts.