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Energy Partitioning Approach를 이용한 Solder Joint의 열 피로 수명 예측
오재응(Jaeeung Oh),강원호(Wonho Kang),이해진(Haejin Lee),안영찬(Youngchan Ahn),이정윤(Jungyoun Lee),신승우(Seungwoo Shin) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Thermal fatigue of solder joints is critical to electronic package performance and service life. The electronic package are composed of different materials, thermal stresses generate at near the interface, such as solder joints due to the differences of thermal expansion coefficients. Results of thermal stress-strain occur thermal fatigue fracture at the interface of different materials. The represent study established finite element analysis to determine the stress and strain history in the solder, due to thermal cycling. The computed stress and strain histories are utilized to construct hysteresis plots at each location in the solder joint. The hysteresis plots are then partitioned into elastic strain energy, plastic work and creep work dissipation. The fatigue life of the solder joint is then estimated through an energy partitioning analysis.
섭동기법을 이용한 자동차용 브레이크 시스템의 열탄성 불안정성 해석
하태원(Taewon Ha),조용구(Yonggoo Joe),김흥섭(Hungsub Kim),이정윤(Jungyun Lee),오재응(Jaeeung Oh) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Frictional heating in brakes causes thermoelastic distortion of the contacting bodies and hence affects the contact pressure distribution. The resulting thermo-mechanical coupling can cause thermoelastic instability (TEI) if the sliding speed is sufficiently high, leading to non-uniform heating called hot spots and low frequency vibration known as hot judder. Thermoelastic instability in automotive brake systems is investigated using analytical simple finite layer model. Critical speeds of the automotive disc brakes and drum brakes were predicted and the effects of the friction coefficient and material properties on the predicted critical speeds are calculated .
디스크 브레이크 로터의 형상 최적화를 통한 스퀼소음 저감
심현진(Hyunjin Sim),이현영(Hyunyong Lee),조용구(Yonggoo Joe),이정윤(Jungyoun Lee),오재응(Jaeeung Oh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
This paper deals with friction-induced vibration of disc brake system under constact friction coefficient. A linear. finite element model to represent the floating caliper disc brake system is proposed. The complex eigenvalues are used to investigate the dynamic stability and in order to verify simulations which are based on the FEM model. The comparison of experimental and analytical results shows a good agreement and the analysis indicates that mode coupling due to friction force and geometric instability is responsible for disc brake squeal. And the Front brake system reduced the squeal noise using design of experiment method (DOE). This helped to validate the FEM model and establish confidence in the simulation results. Also they may be useful during real disk brake model.
분포매개변수를 이용한 디스크 브레이크의 마찰기인 불안정성 해석
차병규(Byeonggyoo Cha),조용구(Yonggoo Joe),이정윤(Jeongyoon Lee),오재응(Jaeeung Oh),우정훈(Junghoon Woo) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with friction-induced vibration of disc brake system under constant friction coefficient. A linear, lumped and distributed parameter model to represent the floating caliper disc brake system is proposed. The complex eigenvalues are used to investigate the dynamic stability and in order to verity simulations which are based on the<br/> theoretical model, the experimental modal test and the dynamometer test are performed. The comparison of experimental and theoretical results shows a good agreement and the analysis indicates that mode coupling due to friction force is responsible for disc brake squeal. This helped to validate the analysis model and establish confidence in the analysis results. Also they may be useful during system development or diagnostic analysis.