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김헌영,김호,김중재,Kim, Heon-Young,Kim, Ho,Kim, Joong-Jae 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.12
A rubber-like material model is generally characterized by hyperelasticity and formulated by a total stress-total strain relationship because the material shows nonlinear elastic behaviour under large deformation. In this study, a pressure potential obtained by a separately interpolated pressure is introduced to the non-linear finite element formulation incorporating with incompressible or almost incompressible condition of the material. The present formulation is somewhat different from the general formulation using the pressure computed in the displacement field. A non-linear finite element analysis program is developed for the plane strain and the axisymmetric contact problems of a rubber-like material. Various examples with rubber material are analyzed for its verification. The results about deformed shapes and stress distributions thought to be meaningful in comparison with a commercial program, MARC.
김헌영,최종길,김정민,이강욱,여태정,Kim, Heon-Young,Choi, Jong-Gil,Kim, Jung-Min,Lee, Kang-Wook,Yeo, Tae-Jung 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.3
Numerical analyses are carried out to evaluate the cumulative impact damage of an automotive front end bumper under the low speed crash events(CMVSS215) by using explicit code. Results of first impact simulation, which are deformed shape, thickness, stress tensors and strain tensors, are used as the initial conditions for a next impact simulation. Between the events, the residual vibration is damped out by using nodal damping, and then recovery after each event is evaluated by several methods, one of which is a springback analysis with implicite finite element analysis code. The coupled analysis scheme for the evaluation of cumulative impact damage is verified through the comparison with test results.
단일 모드 광섬유의 굽힘손실을 이용한 다점 측정 센서 시스템
김헌영,김대현,Kim, Heon-Young,Kim, Dae-Hyun 한국비파괴검사학회 2015 한국비파괴검사학회지 Vol.15 No.1
지능형 센서 기반의 구조 건전성 감시를 통해 안전성을 확보하기 위한 연구는 우주항공을 비롯하여 기계/토목 구조물, 수송 기계 분야로 확대되었다. 특히, 실시간으로 운용되는 구조물은 사고로 인한 재산 및 인명 피해를 예방하기 위해 여러 스마트 센서 기반의 구조 건전성 감시 기술이 요구되는 결과로 이어졌다. 한편, 상용화되어 있는 대부분의 센서는 전자기 기반의 센서로써 전자기 간섭 및 부식과 같은 적용성의 제한과 환경적 요인에 취약할 수 있다. 따라서, 전자기 기반 센서의 단점을 보완하기 위한 신개념 센서로 광섬유 센서가 최근 각광을 받고 있다. 하지만, 광섬유 센서를 이용한 실제 구조물의 감시를 위해서는 고가 장비와 시스템이 요구되어 어려움이 존재한다. 따라서, 본 연구에서는 한 가닥의 광섬유를 이용하여 여러 지점에서 발생할 수 있는 충격을 검출하는 센서 시스템을 제안하였다. 이를 위해, 광섬유 굽힘 손실 현상을 이용하여 같은 충격에 대해 위치별 광 강도의 변화량 차이가 존재하도록 센서부의 모듈을 제작하였다. 그리고, 광 강도 변화에 영향을 미치는 변수들을 이용하여 실험 설계를 하였으며, 충격 위치 검출이 가능함을 실험적으로 검증하였다. Applications of smart sensors have been extended to safety systems in the aerospace, transportation and civil engineering fields. In particular, structural health monitoring techniques using smart sensors have gradually become necessary and have been developed to prevent dangers to human life and damage to assets. Generally, smart sensors are based on electro-magnets and have several weaknesses, including electro-magnetic interference and distortion. Therefore, fiber optic sensors are an outstanding alternative to overcome the weaknesses of electro-magnetic sensors. However, they require expensive devices and complex systems. This paper proposes a new, affordable and simple sensor system that uses a single fiber to monitor pressures at multiple-points. Moreover, a prototype of the sensor system was manufactured and tested for a feasibility study. Based on the results of this experimental test, a relationship was carefully observed between the bend loss conditions and light-intensity. As a result, it was shown that impacts at multiple-points could be monitored.
연료전지 스택의 기밀성 향상을 위한 가스켓 모델링과 해석 기법
김헌영(Kim, Heon-Young),김정민(Kim, Jung-Min),김대영(Kim, Dae-Young),서정도(Suh, Jung-Do),양유창(Yang, Yoo-Chang),임철호(Im, Cheol-Ho) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Fuel Cell Stack performance, which is influenced by the maintenance of a constant internal environment, requires high levels of air tightness. Used for analysis, gasket for fuel cell is made of elastic rubber materials and placed over separator, and shape of deformation of a gasket affects the transformation separator and airtightness while fastening structure. Separator as made of steel sheet isn't broken under pressure but can affect gas and cool water flow by the plastic deformation process. Therefore, it is understood that assembly process is well developed in case distribution of stress and shape of deformation is shown uniformly. This study is conducted on the assumption that a fuel cell maintenance is advantageous in that conditions. In this paper, analyses of unit cell and partial model were performed and distribution of stress and shape of deformation of Gasket and separator were analyzed to evaluate the airtightness while fastening structure.
김헌영(Heon Young Kim),이상근(Sang Keun Lee) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.3
The static stability and crash worthiness of automobile seat are analyzed, and then the structure is modified on the basis of the analysis. A slide model without a seat frame is used to get the appropriate loading time and acceptable results for the quasi-static behaviour by using commercial explicit code. Impact behaviour of full seat assembly model including seat frame and slide, etc., is analyzed to check structural-stability according to the regulation of FMVSS 207 and 210. Some modifications are proposed and a parametric study is carried out. Finally, the model is analyzed to get the certification of structural stability based on the regulation of FMVSS 208 with Hybrid III dummy.<br/>
알루미늄 초결량 차체의 충격 흡수부재 설계 및 충돌 안전도 평가
김헌영(Heon Young Kim),김진국(Jin Kook Kim),허승진(Seung Jin Heo),강혁(Hyuk Kang) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.1
Due to the environmental problems of fuel consumption and vehicle emission, etc., automotive makers are trying to reduce the weight of vehicles. The most effective way to reduce a vehicle weight is to use lighter materials, such as aluminum and plastics. Aluminum Intensive Vehicle(AIV) has many advantages in the aspects of weight reduction, body stiffness and model change. So, most of automotive manufacturers are attempting to develop AIV using Aluminum Space Frame(ASF). The weight of AIV can be generally reduced to about 30% than that of conventional steel vehicle without the loss of impact energy absorbing capability. And the body stiffness of AIV is higher than that of conventional steel monocoque body. In this study, Aluminum Intensive Vehicle is developed and analyzed on the basis of steel monocoque body. The energy absorbing characteristics of aluminum extrusion components are investigated from the test and simulation results. The crush and crash characteristics of AIV based on the FMVSS 208 regulations are evaluated in comparison with steel monocoque. Using thesc results, the design concepts of the effective energy absorbing members and the design guide line to improve crashworthiness for AIV are suggested.
자동차 엔진마운트용 고무에 대한 변형 특성 해석과 형상 최적 설계
김헌영(Heon Young Kim),김중재(Joong Jae Kim),이낙규(Nak Kyu Lee) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.4
The hyperelastic and viscoelastic behaviour of rubber material is described. Uniaxial tensile tests and planar tests are carried out and the test data are verified by simple analysis with one element. Static characteristics of rubber engine mount is analyzed by using the 2D and 3D finite element model. The 2D plane strain model is well corresponded with the 3D model in the aspects of deformed shape, stress distribution and reaction force. With these results and basic shape factor(parameter), optimum shape design process of engine mounting rubber is introduced. The secondary stiffness and the gap size of engine mount are determined by nonlinear spring analysis. The optimum shape design process of engine mounting rubber using a parametric approach is suggested. An optimization code is developed to determine the shape to satisfy the characteristics of mount, which is executed with the commercial nonlinear finite element code. Two engine mounts are designed by the procedure mentioned above. The stiffness values of the final optimized models along the principal direction are compared with the design specifications.<br/>
자동차용 등속 조인트 부트의 대변형 유한요소해석과 내구 성능 예측
김헌영(Heon Young Kim),심요섭(Yo Seob Shim),주연종(Youn Jong Ju),우창수(Chang Su Woo) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
The deformation behaviour of automotive rubber coponents, which are CV joint boot, is analyzed by using commercial finite element program The tests to get the characteristics of rubber material are carried out two types of strain energy potentials are introduced and how to define coefficients from the tests is described. A CV Joint boot has a role to seal the lublacant contained inside joint and to prevent intrusion of dust, water, sand, etc. This study is to compare the deformation patterns, stress and strain distributions, strain and normal forces of two types(original and modified) of rubber boots under the rotation of a shaft in the range 0˚ to 30˚, and to estimate the durability performances. The results of the finite element anlysis about durability performance agree well with those of experimental results.<br/>