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Hybrid Three-dimensional Mesh Generation from Quad-dominant Surface Meshes
한재녕,조남정,채수원,최영 한국자동차공학회 2008 International journal of automotive technology Vol.9 No.5
A hybrid mesh generation algorithm using a modified plastering method for three-dimensional objects with variable thickness is presented. The method starts with a quad-dominant surface mesh and generates layered elements with variable thickness by using adaptive offsetting, resulting in hex-tet dominant mesh generation. Hexahedral and prismatic meshes are generated by the inward offsetting of the initial boundary mesh. In order to generate a conforming mesh, pyramid elements are constructed on top of hexahedral elements, and tetrahedral elements are generated for the remaining domain by using an advancing front method. This method is applied to several different geometries, and the effectiveness of the proposed algorithm is demonstrated. A hybrid mesh generation algorithm using a modified plastering method for three-dimensional objects with variable thickness is presented. The method starts with a quad-dominant surface mesh and generates layered elements with variable thickness by using adaptive offsetting, resulting in hex-tet dominant mesh generation. Hexahedral and prismatic meshes are generated by the inward offsetting of the initial boundary mesh. In order to generate a conforming mesh, pyramid elements are constructed on top of hexahedral elements, and tetrahedral elements are generated for the remaining domain by using an advancing front method. This method is applied to several different geometries, and the effectiveness of the proposed algorithm is demonstrated.
한재녕(Jaenyung Han),최승호(Seungho Choi),방용식(Yongsik Bang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In IIHS side impact test, Injury measures obtained from instrumented 5th percentile female SID-IIs dummies placed in the driver. The 37 measures are grouped into three body regions: head and neck, torso, and pelvis and left leg. Three injury parameters are calculated for the head and neck, three parameters for each thoracic and abdominal rib in the torso, three parameters for the pelvis, and four parameters for the left leg. This study shows improvement of IIHS rating focused on leg injury. The simulation model is generated using MADYMO with PSM(Prescribed Structural Motion).
한재녕(Jae-nyung Han),박정수(Jung-Su Park),채수원(Soo-won Chae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This paper presents a full hexahedral mesh generation by plastering for three-dimensional geometries. In this method, hexahedral elements are generated inward by offsetting from initial boundary mesh. When the elements intersect with each other after offsetting, overlapped elements are improved by node relocation method. In order to construct conforming mesh, pyramid elements are added to all hexahedral elements on the meshing front. With this process unmeshed regions are covered with triangular elements and tetrahedral elements are then generated at unmeshed regions. Finally pyramid and tetrahedral elements are subdivided into hexahedral elements using the Geode algorithm. Sample meshes for several geometries are presented to demonstrate the effectiveness of the proposed algorithm.
한재녕(J.N. Han),채수원(S. W. Chae),권기연(K. Y. Kwon),이병채(B. C. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
This paper deals with a hex-dominant mesh generation using an advancing front methods for three-dimensional geometries. Hexahedral and prismatic meshes are generated inwardly by offsetting from initial boundary mesh. When the meshes intersect with each other after offsetting, overlapped meshes are improved by node relocation method. In order to generate conforming mesh, pyramid elements are inserted between hexahedral and tetrahedral elements. Sample meshes for several geometries are presented and analized to demonstrate the effectiveness of the proposed algorithm.
IIHS Small overlap 충돌시험 시 승객거동해석에 관한 연구
한재녕(Jaenyung Han),김재수(Jeasu Kim),박재원(Jaewon Park),손창규(Changkyu Son),김용석(Yongsuk Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
According to the Insurance Institute for Highway Safety (IIHS) research, the main factor of the occupants’ fatalities in these days is a small overlap crash at frontal crash area. So they recently released new small overlap crash test (25% of a car"s front end on the driver side strikes a 5-foot-tall rigid barrier at 40 mph) protocol. During the crash event, the tested vehicle moves to sideways away from the barrier and the amount of foot well intrusion should be increased more than existing offset test. This can be critical factor for the Dummy injury. In this study, the purpose is to predict injury for small overlap frontal crash test.
BELT ROUTING AND SAFETY ASSESSMENT THROUGH COMPUTER SIMULATION
강현대,김동훈,한재녕,김동석,채수원 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.5
Most of the research on safety belt systems has involved crash simulation that only considered a dynamic human model. However, belt routing analysis, usually known as comfort level estimation, is also an important factor in safety belt design, considering that serious injuries of the abdominal region result from the infiltration of a belt into the neck or the chest. Thus, safety belt evaluations using kinematic human models are also needed. In this paper, a belt fit simulation method is suggested. Using the proposed process, both comfort and safety analyses can be performed under the same conditions continuously, and thus the safety belt design parameters, such as the location of anchor points, dummy posture and etc., can be evaluated. In conclusion, this computer process enables a belt system design to reduce injuries. Most of the research on safety belt systems has involved crash simulation that only considered a dynamic human model. However, belt routing analysis, usually known as comfort level estimation, is also an important factor in safety belt design, considering that serious injuries of the abdominal region result from the infiltration of a belt into the neck or the chest. Thus, safety belt evaluations using kinematic human models are also needed. In this paper, a belt fit simulation method is suggested. Using the proposed process, both comfort and safety analyses can be performed under the same conditions continuously, and thus the safety belt design parameters, such as the location of anchor points, dummy posture and etc., can be evaluated. In conclusion, this computer process enables a belt system design to reduce injuries.
김동훈(Dong-Hun Kim),한재녕(Jae-Nyung Han),김성용(Seong-Yong Kim),김동석(Dong-Seok Kim),채수원(Soo-Won Chae) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Most of the research efforts on a safety belt system have been made for crash simulation by only considering a dynamic human model so far. However, belt routing analysis usually known as comfort level estimation is also an important factor in safety belt design, considering that serious injuries of abdominal region result from the infiltration of belt into a neck or a chest. Thus safety belt evaluation using kinematic human models is also needed. Pre-simulation method in using MADYMO has been suggested in this study, which enables the routing results by eBTD being transferable to MADYMO input successfully. With the proposed process both comfort and safety analysis can be performed under the same conditions continuously, and thus the safety belt design parameters such as the location of anchor points, dummy posture and etc. can be evaluated. In conclusion, this process can be employed easily in the early stage of safety belt system design.
동승자 상해에 영향을 주는 안전벨트 설계인자에 대한 연구
김윤배(Yun-Bae Kim),한재녕(Jae-Nyung Han),김형일(Hyungil Kim),채수원(Soo-Won Chae) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Most of the research efforts on a safety belt system have been made for crash simulation by only considering the driver of the trajectory dynamic human body model. However, FMVSS and USNCAP enhanced interest in the safety of passengers is increasing gradually. Existing simulation by the wrong seat belts suffered injuries in the neck and the chest. Seat belts for the safety of the occupant are an important design parameter. Therefore, to ensure the safety of occupants of the seat belt system to determine the value of the occupant of the injury, as well as dynamic human model for safety belt, you might consider trajectory kinematic human model should be used. In this study, safety belt in order to meet the needs of the design parameters is presented. Through simulation, the design parameters of each passenger’s injuries were evaluated by on the basis of this argument, each designed by a passenger’s injuries were tendencies. This design of a safer seat belt system designed for the optimal combination of elements of the seat belt was found.
MADYMO를 이용한 US NCAP 정면 충돌에서의 목 상해에 관한 연구
손창규(Changkyu Son),한재녕(Jaenyung Han),김홍선(Hongsun Kim),김동석(Dongseok Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The revision of New Car Assessment Program(NCAP) was published by National Highway Traffic Safety Administration(NHTSA) in July 2008. The one of change in frontal impact is the passenger dummy to Hybrid III 5%ile female dummy from Hybrid III 50%ile male dummy. NHTSA has decided to adopt AIS 3+ and AIS 2+ injury risk curves to assess the risk of injury to front seat occupants. Based on the criteria NHTSA test results showed that 5star performances are dropped to 3 or 4 star. In this study, we tried to find out the sensitive body region which will cause the high number of injury probability. Neck injury is the most sensitive value to drive the vehicle safety performance in the passenger. Passenger airbag size effect was investigated to improve the neck injury.