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충돌을 인지한 운전자의 근육긴장에 대한 실험적 그리고 수치 해석적 연구
최형연(Choi Hyung Yun),이범수(Lee Bumsoo),사성진(Sah Sungjin),이인혁(Lee Inhyeok),문무성(Moon Mu Seong),강성재(Kang Sung Jae),조현석(Cho Hyeon Seok) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Occupants who recognize the approaching crash tend to brace themselves. This reflexive muscular activation can affect the kinematics and kinetics of occupant during the crash event but the mechanisms of potential muscle contraction in car crash event remains poorly understood. A quantitative investigation of muscular activation has been attempted by utilizing dynamometer, sled and EMG devices with human volunteers. The experimental findings have been incorporated into the numerical investigation by utilizing a finite element model of skeletal muscular structure of human body.
충돌을 인지한 운전자의 근육긴장에 대한 실험적 그리고 수치 해석적 연구
최형연(Choi Hyung Yun),이범수(Lee Bumsoo),사성진(Sah Sungjin),이인혁(Lee Inhyeok),문무성(Moon Mu Seong),강성재(Kang Sung Jae),조현석(Cho Hyeon Seok) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
Occupants who recognize the approaching crash tend to brace themselves. This reflexive muscular activation can affect the kinematics and kinetics of occupant during the crash event but the mechanisms of potential muscle contraction in car crash event remains poorly understood. A quantitative investigation of muscular activation has been attempted by utilizing dynamometer, sled and EMG devices with human volunteers. The experimental findings have been incorporated into the numerical investigation by utilizing a finite element model of skeletal muscular structure of human body.
FEM 3차원 모델을 이용한 인공관절 대퇴 Stem 경계면의 미세운동 분석
김성곤,최형연,채수원,Kim, Sung-Kon,Choi, Hyung-Yun,Chae, Soo-Won 대한의용생체공학회 1996 의공학회지 Vol.17 No.1
In cementless total hip arthroplasty(THA), an initial stability of the femoral component is mandatory to achieve bony inyowth and secondary long term fixation. Primary stability of the femoral component can be obtained by minimizing the magnitude of relative micromotions at bone stem interface. An accurate evaluation of interf'ace micromotion and stress/strain fields in the bone-implant system may be relevant for better understanding of clinical situations and improving THA design. Recently finite element method(FEM) was introduced in'orthopaedic research field due to its unique capacity to evaluate stress in structure of complex shape, loading and material behavior. The authors developed the 3-dimensional finite element model of proximal femur with $Multilock^{TM}$ stem of 1179 blick elements to analyse the micromotions and mechanical behaviors at the bone-stem inteface in early post-operative period for the load simulating single leg stance. The results indicates that the values of relative motion for this well fit stem were $150{\mu}m$ in maximum $82{\mu}m$ in minimum and the largest relative motion was developed in medial region of Proximal femur and in anterior-posterior direction. The motion in the proximal bone was much greater than in the distal bone and the stress pattern showed high stress concentration on the cortex near the tip of the stem. These findings indicate that the loading on the hip joint in the early postoperative situation before achieving bony ingrowth could produce large micromotion of $150{\mu}m$ and clinicaly non-cemented THA patient should not be allowed weight bearing strictly early in the postoperative period.
최우진(Woo Jin Choi),사성진(Sung Jin Sah),최형연(Hyung Yun Choi) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In order to identify the vehicle access layout elements that may cause discomfort of elderly driver in the access motion, i.e., ingress/egress motions, subjective discomfort ratings of the access motion on a large size sedan were obtained by recruiting thirty elderly volunteers. For a comparison purpose, another thirty young volunteers also participated in the same test protocol of discomfort ratings. From the statistical investigation of both results, it was found that the heights of sidesill and roof are the most discomfort causing elements in ingress motion of elderly volunteers. They complained about the interference and annoyance as well as the muscular burden during the ingress motion with respect to those elements. The sidesill height was the first discomfort elements in egress motion.
이성준(Sungjun Lee),최형연(Hyung Yun Choi),신동욱(Dongwook Shin) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Crash analysis using computer simulation is the significantly economic method to save time and money as compared with sled test. But this analysis is able to make an interpretative problem different from reality by a few of unconsidered factors. So this study is to be able to analyze a more accurate car crash applying to air flow movement that had not been considered before. It is assumed that is different characteristics on condition and It is designed a system of impact experiment of car seat foam considering air flow movement within the foam and pre-strain. This system enables control of pre-strain using electro-magnetic impactor, determination of air flow movement within the foam using punching plate and flow control sensor. It is differ on condition of maximum impact load on the foam, a kind of cover of foam, quantity of pre-strain so as to figure out air flow movement by seat foam used back and cushion by vehicle type. As result, it is observed that maximum load by voltage of electro-magnetic impactor seems repetitiveness of replays on the experiment and that air flow movement from seat foam is belched symmetrically by holes’ position of punching plate. If it is verified additional study on characteristics of seat foam varied by different air flow movement from seat foam, it is able to analyze of car crash using computer simulation more like a reality.
자동차 정면충돌에서 자동차 영구 변형량에 따른 승객 상해 추정
김승기(Seungki Kim),최형연(Hyung Yun Choi) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.2
The estimation of occupant injury risk at crash accident is one of the most important assessments for the vehicle crashworthiness performance. The design of safety devices such as occupant restraining system also depend on the kinematics of occupant and its injury risk. The real world in-depth accident investigation provides detailed and realistic information of vehicle damage and occupant injury as well as the accident conditions. This paper introduces a statistical analysis of NASS/CDS database and domestic accident data to correlate speed change, vehicle damage extend, and occupant injury at frontal crash. The maximum crush extend shows a linear relationship with the effective impact speed. The injury risks of the occupant with and without restraining were also respectively quantified with the crush extend. This result can be effectively used for the emergent rescue of crash victims with automatic crash notification system.
슬레드 모델 시뮬레이션을 이용한 자동차 정면충돌에서 차량 형태별 운전자 상해 판정식 제작
문준희(Jun Hee Moon),최형연(Hyung Yun Choi) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.5
An extensive real world in-depth crash accident data is needed to make a precise occupant injury risk prediction at crash accidents which might be a critical information from the scene of the accident in ACNS(Automatic Crash Notification System). However it is rather unfortunate that there is no such a domestic database unlike other leading countries. Therefore we propose a numerical method, i.e., crash simulation using a sled model to make a virtual database that can substitute car crash database in real world. The proposing crash injury risk prediction is validated against a limited domestic crash accident data.
5^th Percentile 성인 여성 유한요소 모델을 이용한 OOP(Out-of-Position)문제에 대한 수치해석
나상진(Sang-jin Na),최형연(Hyung-yun Choi),이진희(Jinhee Lee) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.3
The out-of-positioned small female drivers are most likely to be injured during airbag deployment due to their stature and proximity to the steering wheel and airdag module. In order to investigate the injury mechanisms, some experimental sludies with Hyhrid Ⅲ 5% female dummy and with female cadavers could be found from the open literatures. However, the given information from those experimental studies is quite limited to the standard conditions and might not be enough to estimate the airbag inflation aggressiveness regarding on the occupant responses and injury. In this study, a finite element analysis has been performed in order to investigate the airbag-induced injuries. A finite element 5% female human model in anatomical details has been developed. The validation results of the model are also introduced in this paper.