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- 저자 : 최문덕(Moondeok Choi) (검색결과 4 건)
- 무료
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- 유료
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최문덕(Moondeok Choi),성하경(Hakyung Sung),김정백(Jungback Kim) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Recent Diesel Engine usually uses main bearing cap to reduce mass, to improve assembly line efficiency and to secure sufficient stiffness for crank shaft support. If main bearing cap doesn’t have sufficient stiffness and durability performance, there is a potential to cause many problems such as oil leakage and block crack. In this paper, an effective way is introduced to achieve mass reduction, to reduce bearing distortion and to improve durability of main bearing cap using the design of experiments and computer simulation. Based on the results from this study, the best effective factor is material property for bearing performance. And the mass of the best condition is reduced by 20.7% when compared with the mass of base model.
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최문덕(Moondeok Choi),김주용(Jooyong Kim),고현일(Hyun Il Ko),조종두(Chongdu Cho) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.3
본 논문에서는 지역난방에 사용되는 이형관인 벤드(bend)의 형상설계에 대한 연구를 수행하였다. 지역난방관은 강관(내부)과 폴리우레탄 보온재(중앙부) 그리고 고밀도폴리에틸렌 외관(외부)의 3개의 중공관으로 구성되며 일반적으로 10~120℃ 온도범위의 물이 16㎏f/㎠의 네압을 가지면서 수송된다. 이에 따라 작동 중 발생하는 반복적인 열적-기계적 하중을 지탱할 수 잇어야 한다. 보통 지역난방관의 밴드부에는 펌패드라고 부르는 신축흡수재가 덧씌워지는데 이 폼패드의 노후에 따른 문제가 종종 발생한다. 본 논문에서는 밴드부에서의 폼패드 노후 문제를 경감시키기 위한 대안으로 폼패드를 없앤 이중보온관의 형상 설계를 제안하였다. 제안된 설계는 밴드부 강관에 전단고리(shear ring)를 적용하는 방법으로 이때 전단고리의 최적치수는 다구찌 방법과 유한요소법을 적용하여 접근하였다. 그 결과로 전단고리의 두께와 높이, 개수 순으로 최적화효과가 있음을 확안하였다. In this study, alternative designs for the bends used in district heating pipes are investigated. The district heating pipes, which are subjected to temperatures of 10 to 120℃ and a water pressure of 16 ㎏f/㎠, have to withstand thermomechanical cyclic loads when in use. These pipes comprise three concentric tubes: a steel pipe (internal), polyurethane (PUR) insulator (middle), and a high-density polyethylene (HDPE) case (external). In addition, the bends in the district heating pipe system are covered with foam pads that cause aging. In this study, an alternative bend design that does not involve the use of a foam pad is proposed to overcome the aging problem in the bends.. In the proposed design, “shear rings” are added to the surface of a bend, and its dimensions are determined by a combination of the statistical (Taguchi) method and FEM. The geometrical parameters such as thickness, height, and number of the rings significantly affect the design optimization, and hence, they affect the results of the FEM.
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실험계획법을 이용한 자동차 DOOR BELT LINE REINFORCEMENT 설계
최문덕(Moondeok Choi),임성식(seongsik Lim),이철(Chul Lee),김용석(Yongsuk Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Recent automakers is usually using reinforcing bracket to secure sufficient stiffness of side closure because vehicle side closure is only supported at hinge and latch points. If side closure itself doesn`t have sufficient stiffness, there is potential to cause many problems such as coming loose of bolt and vibration. In this paper, an effective way is introduced to achieve mass reduction of side closure and to improve stiffness of side closure using the design of experiments and computer simulation. Based upon simulation results, a mass reduction of side closure is achieved without stiffness deterioration of side closure and we can get more optimized belt line reinforcement design.
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차량 강성 확보를 위한 Structural Adhesive 민감도 분석
최문덕(Moondeok Choi),주재환(Jaehwan Ju),김익현(Ikhyun Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Recent automakers want increase the rigidity of the car. The reason is why customers want to enjoy driving it and have no problem about noise and vibration in the car. Those two performances (driving and NVH performances) are related with body stiffness. Those performances are increased when body stiffness is increase. The simplest way to improve stiffness efficiency is gauge up. However, excessive thickness increase and addition reinforcement may produce cost increase, which can deteriorate vehicle performance such as fuel efficiency. And It can also make package loss. In this paper, an effective way is introduced to achieve structure mass reduction and to keep original structure based upon sensitivity analysis. The structural adhesive of vehicle which has a sensitive effect on torsional stiffness bending stiffness have been investigated by Optimization simulation using Genesis. Throughout this study, we get the information where is the most sensitive site in using the structure adhesive to raise the stiffness.
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