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회전굽힘응력하에서 표면균열을 갖는 환봉재의 응력확대계수해석 및 수명예측
오환섭(H.S.Oh),박철희(C.H.Park),박재석(J.S.Park) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this study. First we analysis 3-dimensional stress intensity factor(SIF) K of surface crack of round bar under rotary bending by using boundary element method (BEM). And compare it with S.I.F K of 2-dimensional plane stress gained from experiment at the same condition. Then. With this resule. Life prediction is attempted.<br/> In propagation of surface crack. Scattering of 3-D K considering aspect ratio and ligament ratio is less than that of K of 2-D plane stress. And 3-D K is more close to Paris’ formula da/Dn=CKM. Futhermore. The results of life prediction based on paris’ and Walker’s law are well met with experimental data.<br/>
박재석(J. Park),장덕일(D. Jang),서민성(M. Seo),김성동(S. Kim) 유공압건설기계학회 2020 유공압건설기계학회 학술대회논문집 Vol.2020 No.7
This study is designed to solve the problem of general paralysis patients suffering from muscle diseases such as Lou Gehrig’s disease. A general paralysis patient is unable to move and cannot speak due to muscular dystrophy and muscle weakness. But they can move their eyes, they use them to conduct a search. In this study, a eye-mouse instrument was studied in which a general paralysis patient communicates using eye movement, and an eye-mouse was controlled using Arduino. The configuration recognizes the movement of the eyeball using glasses, QTR sensor, and mpu-6050 acceleration sensor, making it mouse-click and output to the monitor. Experiments have shown that it took an average of 19 seconds to access three web pages, and that it is easy for beginners as well as experienced people to use. The actual implementation of eye-mouse was demonstrated by this design.