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Hood Fixed Bumper 강성을 위한 Upper-Tiebar Side형상 최적화 연구
이민규(Mingyu Lee),주재환(Jaehwan Ju),주영준(Youngjun Joo),김용석(Yongsuk Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Upper-tiebar bridge member is that affect both the safety and stability of the vehicle and where a lot of mounted Hang on part. Designing Upper-tiebar Design based on CAE(virtual assessment) will reduce engineering cost, and this will effect on the safety over design optimization of Upper-tiebar. In existing study, studied mainly satisfied Hood Fixed local stiffness or analytical (simulation) method studies to validate design feasibility. In this study, reduce design iteration through vitual test and optimization tools. In this study, simulate impact test (drop weight) on CAE. As a result, reduce engineering cost and time due to reduce design iteration
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.
정민규(Minkyu Jung),주재환(Jaehwan Ju),김채원(Chae Won Kim),이창건(Changkun Lee),김용석(Yongsuk Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Manufacturers are making every effort to reduce new car development period, in order to meet customer requests in time of need. To reduced development period, CAE method is used in most fields of vehicle performance. Especially, as for durability performance of body structure, it takes generally long time to finish physical validation using RLDA obtained from proving ground considering time of hardware vehicle building and testing. Also, there are many difficulties in prediction fatigue life of body structure because it is hard to get account fatigue parameter of material and accurate loads on body structure before physical RLDA test. However, CAE method has strong benefits to predict before physical test, under the condition that there is well-correlated CAE model including dynamic loads calculated from virtual dynamic loads. This paper shows the durability CAE method explaining how to use virtual loads and to correlate with multi-channel durability LAB test. And this paper is trying to propose virtual validation methods to predict specific part of body structure fatigue life using virtual loads.