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[구조강도부문] BRAKE JUDDER 개선을 위한 BRAKE DISC 최적 설계 기법 연구
신동철(DongChul Shin),김택조(TeakJo Kim),지태수(TaeSoo Chi),김광윤(KwangYoon Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Thermal behavior of brake disc significantly affects brake performance and brake judder. This paper will document the thermal distorsion of brake disc so called coning and propose brake disc design factors which influence the coning. To investigate the thermal behavior of brake disc, thermal stress and transient FEM techniques were used. Several prototype discs were made and brake dynamo tests were performed to verify the simulation results. This optimized brake discs were applied to mass production.
남정환(Jeonghwan Nam),황재석(Jaisug Hawong),신동철(Dongchul Shin),박성한(Sunghan Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Rubber o-ring has been used as packing parts in the high pressure vessel, the parts of air plane, the parts of fluid pressure, the atomic planet, the rocket etc,. When metal parts and O-ring are assembled, squeezing forces in the O-ring are produced in the O-ring due to assembling of O-ring and packing parts and the internal pressures applied to O-ring. Therefore the various deformations of O-ring are produced due to the assembling conditions and the internal pressures. The relationships between the deformation behaviors of O-ring and the packing function of O-ring are very important in the packing of O-ring. Therefore in this research, the following topics were studied. The behaviors of O-ring under uniform squeeze rate and internal pressure were studied. The relationships between the deformation behaviors and packing function were studied. The relationships between the deformation behaviors and stress distributions of O-ring were studied.
MEMS 센서 응용을 위한 PZT Actuator 제작에 관한 연구
이현기(HYUNKEE LEE),조성민(SUNGMIN CHO),경제홍(JEHONG KYUNG),신동철(DONGCHUL SHIN),이영규(YEONGGYU LEE),민종환(JONGHWAN MIN),강영식(YOUNGSIK KANG) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
MEMS 센서 응용을 위하여 Zr/Ti=52/48 조성의 sol-gel을 Multi coating하여 2㎛ 두께 의 PZT actuator를 구현하였다. 층간 pore와 표면 crack, Haze 등이 없고, 2차상이 없는 Perovskite 상을 확인하였으며, 6inch wafer에서 두께 uniformity 5% 이하의 균일한 PZT 막을 형성하였다. Pt/TiO2 하부전극을 이용하여 하부 전극의 계면 열화 현상을 극복하였으며, (111) 우선 배향성을 얻었다. 제작된 PZT actuator는 dielectric constant와 Pr 값이 각각 1200과 24(uC/㎠)의 특성을 보였고, LDV로 측정된 압전 특성은 d33값이 120pm/V로 측정되었다.
남정환(Jeonghwan Nam),황재석(Jaisug Hawong),김영탁(Youngtak Kim),박성한(Sunghan Park),신동철(Dongchul Shin) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this research, stress components and principal stresses of O-ring under internal pressure and under uniform squeeze rate were obtained from the stress freezing method of photoelastic experiment and photoelastic experimental Hybrid method for 3-dimensional problems. The obtaining processes of those were introduced. It was certified that the processes of those are effective for the 3-dimensional stress analysis of structures. Stress freezing method, the obtaining processes of those and photoelastic experimental hybrid method were effectively applied to the stress analysis of O-ring made from rubber that under uniform deformation and internal pressure. Stress components and principal stress of Oring under uniform squeeze rate and under internal pressure were analyzed.