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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.
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.
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.
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.