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변형배(Hyungbai Byun),이창건(Changkun Lee),김동석(Dongseok Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
An application of high strength steels to door outer panels has contributed in body weight reduction by reducing thickness. They should be designed to meet various requirements such as panel stiffness, weight, and oil canning. Dent resistance is one of them and it can be defined a local permanent plastic deformation. Thickness, material characteristics, and the curvature can be influencing factors for design factor for dent resistance. This paper deals with which one is the major concern to determine door outer panel stiffness and dent resistance through simulation.
최누리,주병현,변형배,김동석,이병채,Choi, Noo-Ri,Ju, Byeong-Hyeon,Byun, Hyung-Bai,Kim, Dong-Seok,Lee, Byung-Chai 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
We suggest a design method for reducing the number of spot welds in the vehicle body in terms of durability. To reduce the number of spot welds, we use the DOE(Design of Experiments) analysis with two influence indices for the durability and the fatigue life of a spot weld itself. Through the suggested design method, we select spot welds that could be removed without serious reduction of durability of the whole model. We apply this new methodology to the BIW(Body In White) model of a vehicle by choosing some practical parts where durability-related point of view must be considered importantly by experience.
김선규(Kim, Seon-Gyoo),변형배(Byun, Hyung-Bae),김재홍(Kim, Jae-Hong),정웅(Jung, Woong) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.9
Controversies over that the scheduling practices for the construction projects in Korea are unsystematic, illogical, and less advanced still continue. One of the main controversial issues is that the existing scheduling techniques does not satisfy the scheduling requirements of construction site. Because most construction personnel prefer a good-looking and easy understanding schedule, LOB and TACT techniques although those are not formal CPM technique have been applying overwhelmingly in the construction projects. Moreover, LOB and TACT techniques can be quickly and conveniently established by Excel or word-processor familiar with most people. Since Excel is not a formal scheduling software, however, it can not provide formal CPM scheduling practices. The purpose of this study is to propose the method that can satisfy visual schedule format as well as perform formal CPM scheduling practices by integration of LOB and TACT techniques by BDM technique.
DFSS기법을 활용한 Rear Axle Mounting 구조 최적화에 대한 사례 연구
이상진(Sangjin Lee),변형배(Hyungbai Byun),백승(Seung Baek) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Stiffness of axle mounting structure is one of basic factors affecting on ride & handling performance of the vehicle. The easiest way to increase stiffness of the structure is increasing thickness of sheet metal panels or adding reinforcement. But that means an increasement of mass and process in manufacturing. Design for six sigma (DFSS) is a practical technique for robust and optimized design in manufacturing industry. In this study we applied DFSS to optimize thickness of panels of rear axle mounting structure for increasing stiffness and decreasing mass of the structure. The design of experiments(DOE) in DFSS is based on Daguch method and finite elements method (FEM) is applied to obtain stiffness of rear axle mounting. Control factors are thickness of 8 panels of the mounting structure, output responses are stiffness and mass of the structure, and noise factor is not applicable as relation between thickness and stiffness is linear.
민감도 분석을 통한 효율적 차량 비틀림 강성 확보를 위한 연구
임성식(Seongsik Lim),변형배(Hyungbai Byun),백승(Seung Baek) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recent automakers have a deep concern about fuel efficiency to comply with strengthened environmental regulation. The simplest way to improve fuel efficiency is structural mass reduction and various mass reduction ideas have been developed and studied to improve fuel efficiency. However, excessive mass reduction may produce low stiffness structure, which can deteriorate vehicle performance such as structural durability, handling performance and so on. In this paper, an effective way is introduced to achieve structure mass reduction and to keep original structure torsional stiffness based upon sensitivity analysis. The vehicle parts which have a sensitive effect on torsional stiffness have been investigated by optimization simulation using optistruct. Based on simulation results, structure mass reduction is achieved without body torsional stiffness deterioration.
최누리(Noori Choi),변형배(Hyung Bai Byun),김동석(Dong Seok Kim),이병채(Byung Chai Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In many mechanical structures, the number of spot welds is closely related to overall cost and time of production of assemblies. In this study, we optimized the location and the number of spot welds in the lower control arm of the vehicle, as far as the structure retained the maximizing the fatigue resistance and durability. To ensure the requirements, we proposed design of experiment optimization method for the durability of LCA. During this optimization process, the design guideline for the optimal spot welding number and location was drawn as the minimum life expectation influence.
비선형 유한요소해석 프로그램을 이용한 차체 구조물의 동강성 및 정강성 해석
김성현(Sunghyun Kim),김형일(Hyungil Kim),변형배(Hyungbai Byun),김동석(Dongseok Kim),이용훈(Yonghoon Lee),김일환(Ilhwan Kim),허승진(Seung Jin Heo),임홍재(Hong Jae Yim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this study, dynamic stiffness analysis and static stiffness analysis were conducted by using nonlinear finite element analysis program and linear finite element analysis respectively to compare the results and to confirm reliability about results of nonlinear finite element analysis program. First, dynamic stiffness analysis has been performed on side out panel, crash box, sub-frame and BIW(Body In White) that has been connected with front bumper, rear bumper and sub-frame. Second, static stiffness analysis has been conducted on crash box and hood that has been modeled with spot weld elements and rigid body elements. Consequently, differences of dynamic and static stiffness analysis results through nonlinear finite element analysis program and linear finite element analysis were below 6 % but difference was more than 6 % as to dynamic stiffness of BIW.