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강성종(Sung-Jong Kang),서홍재(Hong-Jae Seo),김병주(Byung-Joo Kim) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.4
Fuel tank sloshing noise of vehicle is caused by flow impact on the tank wall during sudden braking, and the sloshing vibration of tank wall is a coupled phenomenon of the fuel inside tank and tank wall structure. Therefore, Fluid-Structure Interface(FSI) analysis technology should be adopted to predict accurately the sloshing vibration. In this study, FSI approach was employed to analyze sloshing phenomenon for a simple tank model with velocity change of the actual vehicle test. First, the simulated results for rigid tank model were compared with those for deformable tank model. Next, influence of baffle location and shape of baffle holes on the acceleration magnitude and the maximum stress of tank wall was investigated. In addition, sloshing analysis for tank with another baffle type was carried out.
응력 파워스펙트럼 밀도를 이용한 차량 내구해석기술 연구
강성종(Sung Jong Kang),유영덕(Young Duk Yoo) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.2
In this study, an endurance estimation technique for vehicle body structures was inves-tigated and applied. Random road surface was measured and displacement PSD(power spec-trum density) of the road was calculated. And through random vibration analyses for full body shell finite element model using the displacement PSD as the input, stress PSDs were obtained at critical areas. Using this PSD, body fatigue life was estimated and displayed automatically as color contours using graphic method. In comparison with proving ground fatigue test results, predicted results show good agreements.<br/>
윤상민(Sang-Min Yoon),강성종(Sung-Jong Kang) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
Door effort was calculated for a new door checker with torsion bar spring and integrated checker case by FE analysis. A hybrid checker arm which has peaks and valleys only on the upper surface was adopted to reduce noise in operation and make operation with more distinctive steps. The checker arm was modeled using shell elements to estimate both the longitudinal and the lateral resistance force by checker arm. By combining the checker arm resistance force obtained from analysis and the door self-closing force by the theoretical calculation, door effort was predicted to show the good correlation with test results. In addition the unrolling effect of roller model was investigated and a new roller type for more smooth rolling was studied.
부재단면 형상에 따른 부재 굽힘붕괴 특성의 폼 충진 효과
이일석,강성종,Lee, Il-Seok,Kang, Sung-Jong 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
More diversified and strengthened safety regulations require higher safety vehicle with less weight. The structural foam can play a role for restraining section distortion of main body members undergoing bending collapse at vehicle crash. In this study, using structural foam modeling technology, validated in previous work, the bending collapse characteristics were evaluated for two types of circular and actual vehicle body frame sections. With changing the foam filling method, outer panel thickness and section shape, load carrying capability and absorbed energy were observed. The results indicate valuable design strategy for effectively elevating bending collapse performance of body members with foam filled.
김형광(Hyoung-Kwang Kim),강성종(Sung-Jong Kang) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Recent trend of the consumer preference in automobile market is sport utility vehicle and multi-purpose vehicle, which provide wide inner space for various and efficient usage. Though those vehicles are convenient for loading much luggage in space behind the third seat, if the vehicle undergoes front impact with high velocity, that luggage strongly collides into the seat back and the passengers in the seat could be severely injured. Therefore, high strength against luggage intrusion is required for the third seat, and it is regulated by law of ECE R17. In this study, through comparison of the analysis and test results for a seat under developing of a new vehicle, an analysis technique for simulating luggage intrusion test for ECE R17 was investigated.
기창원(Chang Won Kim),강성종(Sung Jong Kang) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.3
Proper door effort, required force to open or close a vehicle door, is an essential door design factor for the safety of passengers and pedestrians. Section shape of the door checker arm is the most influential design parameter for achieving a door effort design target. In this research. an analysis procedure to predict door effort using a simplified plane strain finite element model wes investigated for two passenger cars. for which mechanism of checker systems were different. The variation of checker arm force to be required during moving on arm in opening and closing direction was estimated through analysis, and the result was transformed to the door effort with respect to door opening angle by considering door characteristics. Also, the self-closing force due to door weight was theoretically calculated and added to the door effort from checker arm force. Finally the estimated results of door effort were compared with test results.
유한요소법에 의한 축대칭과 Tee 구조물의 액압 성형성 연구
배진우(Jin-woo 8ae),강성종(Sung-jong Kang) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Though active applications have been carried out in auto industry, tube hydroforming is still in development stage and comprehensive knowledge is not available. The success of tube hydroforming processes is strongly dependent on the designed loading path (relationship between internal pressure and axial material feeding). The select of the proper loading path is usually based on experience and trial-error based FEM simulation.<br/> In this study, tube hydroforming formability was investigated for forming two simple shapes such as axisymmetric expansion and tee expansion, and optimal processes (pressure and feeding history) for achieving the acceptable final shapes were designed using DYNAFORM. First, for the axi-symmetric expansion, open forming type and closed forming type were considered. The optimal process for each type was designed, and the resulted formability, including principal strains with FLD, maximum thinning ratio and thickness distribution for that chosen processes, were discussed Next, formability study was performed for the tee expansion. Two forming types, one which has a counter punch at tee branch end and the other which does not, were considered. The optimal processes were designed and their forming results were analyzed. Lastly, tube length effect on the deformable tee height was investigated with changing tube length for tee expansion with a counter punch.<br/>