저자명 Jesung Yoo 
년도 2014 
Electric vehicles have gained increasing interests as new research area to reduce the air pollution as well as carbon dioxide. Electric vehicles are able to save energy that wasted during braking and do not need energy to keep engine start. In adittion, mechanical connection between motor and battery is not necessary to electric vehicles so that various type of structure can be applied to electric vehicles. TWVs(Three Wheel Vehicles) are one of the efficient type of vehicle to increase driving distance for their low weight and air resistance, although TWVs are weaker in rollover than FWVs(Four Wheel Vehicles). Rollover can take place by not only severe cornering or lane change but also side collision and flip over by obstacles. In addition, rollover motion of TWVs can be different from that of FWV because of basal plane of TWVs are different from that of FWVs.
This paper is concerned with auto-body frames and roof structures against rollover motion which could take place frequently with TWVs compared to FWVs because of the major difference of the loading between the two motions. Topology optimization is a mathematical approach that optimizes structure satisfying performance targets within a given design space and set of loads and boundary conditions. Topology optimization is utilized for conceptual design and preliminary design of the roof structure for various loading conditions. The roof structure for TWV consists of existing part of FWV and a new part called Cross-bar reinforcement. Material of A pillar and cantrail is DP780, DP980 is for B pillar, SPRC440 is for C pillar, and DP590 is for member structures. Although a test method for regulation of roof strength is with static loading, simulations are carried out for both static and dynamic cases. In the dynamic loading case, rate-dependency of a material needs to be considered for accurate results of FE analysis. In addition, the roof structure is modified into various types for a better result. The roof crush is investigated with various modification of the roof structure to figure out the best modification of the roof structure for TWV. Effects of each design parameters are calculated by using FE analysis. The better result is calculated when all member structures except for rear member are straight than when these are arch shape. Furthermore, rear member of arch shape makes the result better than that of straight shape. This difference is caused by different buckling mode. These result considering the effect of each design parameter can utilized to optimize roof structure.

번호 제목 저자명 날짜 조회 수
» Structural Design and Evaluation for Improvement of the Roof Strength of a Three-Wheel Vehicle(삼륜차의 루프 강도 향상을 위한 구조 설계 및 평가) file Jesung Yoo  2017.06.07 157
48 Tension/Compression Hardening Behavior of Auto-body Steel Sheets at Intermediate Strain Rates Ranging from 0.1/s to 50/s(중 변형률속도 0.1/s ~ 50/s 영역에서의 차체 강판의 인장/압축 경화 거동에 관한 연구) 주근수  2014.01.16 3405
47 Tensile Properties of Nugget Region in a Spot Weld at Various Strain-Rates (점용접 너겟부의 변형률속도에 따른 인장 물성에 관한 연구) 박문수  2014.01.16 3065
46 Validation of Dynamic Hardening Models at High Strain Rates Using Taylor Impact Tests (테일러 충격시험을 이용한 고 변형률속도 조건에서의 동적 경화모델 검증) 박명준  2013.09.02 3962
45 Tensile Material Properties of Carbon/epoxy Composite Laminates at High Strain Rates (탄소섬유강화 복합재료의 변형률 속도에 따른 인장물성의 평가) 최재영  2013.02.12 6140
44 Design and Dynamic Simulation of a New Shock Absorbing Device with a Bending Strap in a Helicopter Pilot Seat (헬리콥터 조종석의 굽힘 판재를 이용한 새로운 충격흡수장치의 설계 및 동적 모사해석에 관한 연구) [1] 박주형  2013.02.12 6288
43 Anisotropy Effect on the Fracture Forming Limit Diagram of DP980 Sheets Considering the Loading Path (DP980 강판의 하중경로를 고려한 파단성형한계도에 미치는 이방성의 영향) 박남수  2013.02.12 5363
42 Study on the Dynamic Failure Model of Structural Adhesive Joints under Combined Loading Conditions(차량 구조용 접착제를 이용한 접합부의 복합하중조건에서 동적 파단 특성 연구) 임승찬  2013.01.24 4778
41 Study on the Strain-Rate Dependent Tensile Properties of Micro-Scale Aluminum Specimens(알루미늄 마이크로시편의 변형률속도에 따른 인장 특성 연구) 권준범  2012.03.01 7074
40 Study on the Fracture Strain of DP780 Sheets Considering the Strain Rate and Loading Path (변형률속도와 하중경로를 고려한 DP780 강재의 파단변형률에 관한 연구) 박근환  2012.02.20 10815
39 Evaluation of Ultimate Buckling Strength of Stiffened Plates for Marine Structures (해양구조물용 보강판구조의 좌굴한계강도 평가) Waseem Gul  2010.07.13 7759
38 Study on Design of Stress Wave Micro Sensor for High Speed Transportation Safety System (고속운송기구의 안전시스템을 위한 마이크로 응력파 센서 설계 연구) 임성준  2010.07.13 6596
37 Study on the Anisotropy of Auto-body Steel Sheets considering the Strain Rate(변형률속도를 고려한 차체강판의 이방성에 관한 연구) 이창수  2010.07.13 7995
36 Reliability Based Design Optimization for Crashworthiness of a Spot Welded Hat Type Member (점용접 모자형 사각관의 충돌성능에 대한 신뢰도 기반 최적설계) 김유종  2010.07.13 6354
35 Upper Bound Analysis of Dynamic Buckling Phenomenon of Circular Tubes Considering Strain Rate Effect (변형률 속도를 고려한 원형 튜브의 동적 좌굴 현상의 상계 해석에 관한 연구) 박충희  2008.08.02 6155
34 Study on the Crash Energy Absorption and Dynamic Local Buckling of the Expansion Tubes (확관튜브의 충돌에너지 흡수성능 및 동적 국부좌굴에 관한 연구) 안광현  2008.01.28 5458
33 Dynamic Material Properties of the Heat-Affected Zone (HAZ) in a Resistance Spot Weld(점용접 열영향부의 동적 물성특성에 관한 연구) 하지웅  2008.01.25 6932
32 Cross-section Shape Design of an Aluminum Crash Box for Crashworthiness Enhancement (충돌성능 향상을 위한 알루미늄 크래쉬 박스의 단면 형상 설계) [1] 이경호  2008.01.25 6511
31 Finite Element Inverse Analysis of the Sheet Metal Forming Process Considering Bending History (굽힘 이력을 고려한 박판성형공정의 유한요소 역해석) 허지향  2008.01.25 5253
30 Study on the 3-D finite element modeling of fiber reinforced rubber composite using the rebar element (리바요소를 이용한 섬유강화 고무기저 복합재료의 3차원 유한요소 모델링기법 연구) 정세환  2006.08.18 5917