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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.
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.
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.
후륜 서스펜션 부싱고무에 대한 정/동특성 해석 및 형상 설계
김헌영(Heon Young Kim),김호(Ho Kim),이우일(Wooll Lee),계경태(KyongTae Jye),최계순(WooHyun Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Static and dynamic FEM analysi was performed for the design of TCB which is used in rear suspension system of light-weight vehicle. Engineering sample was made and tested for static stiffness estimation. Dynamic analysis<br/> based on viscous-elasticity theory was done. Based on verified static/dynamic analysis results, system analysis of test vehicle's rear suspension was performed to check current ride performance and find optimum condition. The design of current TCB was modified to give optimized ride performance to test vehicle's rear suspension. Analysis of variance and orthogonal array was used to find optimized shape design of modified TCB.<br/>
유체-구조 상호작용기법을 이용한 일회용 약물주입기의 성능 해석 및 최적 설계
김헌영(Heon Young Kim),김학진(Hak Jin Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.11
본 논문은 유체-구조 상호작용기법을 활용하여 약물을 일정하게 공급할 수 있는 약물주입기의 성능을 예측하고 이를 바탕으로 탄성체 구조의 최적 설계안을 제안한다. 탄성체 약물주입기는 지속적인 약물치료를 필요로 하는 재택환자에게 일정하고 안정된 속도로 약물을 주입하기 위해 개발되었으며, 약물을 수용하는 탄성체의 회복력을 이용하여 일정시간 동안 지속적으로 약물을 공급하는 장치이다. 기존의 탄성체 약물주입펌프는 약물의 잔여량에 따라 주입 압력이 변하고, 약물의 주입량이 시간이 지남에 따라 감소하는 문제점이 있다. 이를 해결하기 위하여 약물이 주입되고 배출되는 전 단계에 걸쳐 일정한 압력을 유지하도록 기구부를 최적설계하고, 유한요소해석 및 실험을 통해 성능을 검증하였다. A disposable drug infuser is used to provide drugs to patients who are not hospitalized; in this infuser, an elastic recovery force is exerted by a diaphragm made of a rubber-like materialsuch that a constant amount of drugs is provided to a patient. The drug infuser has to control the speed and amount of drugs to be released, as well as the overall duration for which they are to be administered. However, in a drug infuser with an elastic diaphragm, the infusion pressure depends on the amount of drug remaining within the infuser, and the amount of drug infused gradually decreases as the amount remaining in the infuser decreases. In this study, a finite element procedure involving the application of the fluid-structure interaction technique was developed and the performance of the elastic type disposable drug infuser was analyzed. The optimum design for ensuring that the infusion pressure remains constant throughout the duration of usage, including during infusion and discharge, was determined by this procedure.
[구조강도] 에너지 흡수용 Honeycomb Core 설계에 관한 연구
김헌영(Heon Young Kim),김상범(Sang Bim Kim),김중재(Joong Jae Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
Honeycomb has the unique property of crushing in a uniform, predictable and efficient manner. This makes it well adapted for energy absorption applications. Its property is mainly depending on cell configuration. Honeycomb cell configuration was designed by satic crush strength test. In this study we developed the honeycomb cell configuration optimization system consisted of mesh generator optimiaztion routine and Finite Element Solver. Mesh generation programs are employed for generate arbitrary cell configuration and apply complicated boundary and loading condition automatically. BFS(Broyded-Fletcher-Shanno) method is used to optimize the cell configuration. Correlation between test and finite element simulation is conducted about energy absorbing batter of regulation FMVSS 214. And, using optimization system. honeycomb cell size is detected with an arbitrary strength
RCAR 저속 충돌시 Crash Zone 설계에 관한 연구
김헌영(Heon Young Kim),김상범(Sang Bum Kim),강우종(Woo Jong Kang),배한일(Han-il Bae) 한국자동차공학회 2003 한국자동차공학회 Symposium Vol.2003 No.5
The impact energy in low speed crash must be absorbed locally in the front structure with no damage in the rear part of an auto-body. The repair cost in a low speed crash could be reduced by establishing energy absorbing element such as a crash box. The front structure of an auto-body should be designed to reduce the repair cost in a low speed crash accident. The strength and energy absorbing ability of a crash box is also related with 5mph bumper performance. A compromised solution is acquired to satisfy the 5mph bumper and 15kph crash performance. Finally, to improve the repairability of crash zone, separable crash box and foam filled crash box was proposed.