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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.
RCAR Override/underride 테스트의 해석적 접근
임성식(Seongsik Lim),이창섭(Changseob Lee),임종현(Jonghyun Yim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To improve damageability and repairability of passenger car has been an important RCAR topic. In order to prevent unnecessary damage to the structure of passenger cars and to assess how well a vehicle's bumper system protects the vehicle from damage in low speed crash, RCAR override/underride bumper test becomes more important with 15kph and 40% overlap danner. So car manufacturers need to develop bumper system which performs well in this RCAR bumper test. For this, the way to get more accurate simulation result of RCAR override/underride bumper test is proposed in this paper. The results showed that 1) FE model having axle should be used for this test 2) application of initial stress to connection part makes more accurate simulation result.
IIHS 천정강도 시험의 Correlation을 위한 해석적 연구
임성식(Seongsik Lim),배진욱(Jinwook Bae),임종현(JongHyun Yim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
It is reported that over ten thousands people a year are killed in rollovers in US. When vehicles roll, their roof hits the ground, deforms, and crushes. So Automakers should make an improvement in order to reduce the risk of injury from contact with severely deformed roof itself when rollover is occurred. As a first step to improve the roof crush performance, CAE simulation is used but it is very difficult to exactly simulate a physical test by using a explicit code because the roof crush test is a quasi static phenomenon which takes relatively long time comparing with simulation running time. To earn more exact simulation results of IIHS roof crush test, case studies which have stamping effect and increased integration point of FE element was done. It will be helpful to improve IIHS roof crush performance using CAE.
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.
Tire Tub 강성 개선을 위한 Rear Floor Rear 형상 최적화에 대한 연구
김상기(Sanggi Kim),임성식(Seongsik Lim),이상진(Sangjin Lee),이창건(Changkun Lee),김용석(Yongsuk Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this paper, new methods and procedures are considered for improving spare tire tub stiffness that is related to vehicle durability. First, we found out optimized bead shape for rear floor rear by topography analysis and additionally made a study on panel thickness and curvature shape for securing the higher level stiffness. In base on this study we secured 2~4 times higher stiffness than spare tire tub stiffness with minimum mass increase.