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소구경 분기배관 용접부의 피로강도에 미치는 용좁부 형상 및 용접공정의 영향
백종현(Jong-hyun Back),김철만(Cheol-man Kim),김우식(Woo-sik Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
S-N fatigue tests were conducted to investigate the fatigue strength of small diameter socket and butt welded joints made of carbon steels. Experimental parameters were diameter, throat depth, shape of socket welds and welding procedure. Filler used in SMAW and GTAW precedure were E9016-G with diameter of 4.0 mm and ER705-G with diameter of 2.4 mm. API 5L Gr.B pipes were adopted as a small diameter diamrter brach pipes. All socket fittings were machined from ASTM A105 carbon steel. Tensile strength was not affechted by the welding procedure. Fatigth strenhth in socket weld joints increased with increasing pipe dipe diameter, area of weld wetal and weld leg length of pipe side.
매설 가스 배관 이종금속 용접부의 강도 불일치가 잔류응력에 미치는 영향 고찰
김종성(Jong Sung Kim),김우식(Woo Sik Kim),백종현(Jong Hyun Back) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this study, residual stress distributions of the welds with different strength in natural gas piping are calculated by using the finite element analysis simulating realistic welding process. The residual stress analysis results are compared with the previous study results in order to validate the finite element analysis model and procedure. Parametric study is performed to assess effect of welding and material variables such as mechanical strength mismatch, strength of weld metal, reinforcement and heat input, etc. on the residual stress distributions. Finally, based on the parametric study results, the effects of the variables are investigated.
성능 모멘트 적분법을 이용한 제작공차에 의해 발생하는 스피커 성능함수의 확률분포 특성 예측
강병수(Byung-su Kang),백종현(Jong Hyun Back),김동훈(Dong-Hun Kim) 한국자기학회 2016 韓國磁氣學會誌 Vol.26 No.3
This paper introduces a performance integration method to predict variation characteristic of a performance function of electromagnetic machines or devices due to manufacturing tolerances. A normalized performance function space and a hybrid mean value technique are adapted to effectively predict mean and variance, which can identify probabilistic distribution of the performance function. To verify the effectiveness and accuracy of the proposed method, a mathematical problem and a loudspeaker model are tested, and numerical results are compared with those of existing methods such as Monte Carlo simulation and univariate dimension reduction method.
단변수 차원 감소법을 이용한 제작 공차가 유도전동기 성능에 미치는 영향력 분석
이상균(Sang-Kyun Lee),강병수(Byung-Su Kang),백종현(Jong Hyun Back),김동훈(Dong-Hun Kim) 한국자기학회 2015 韓國磁氣學會誌 Vol.25 No.6
This paper introduces a probabilistic analysis method in order to analyze the effect of manufacturing tolerance on induction motor performance occurring in massive production. The univariate dimension reduction method is adapted to predict probabilistic characteristics of a performance function due to certain probabilistic distributions of design variables. Moreover, the sensitivity information on mean and variance of the performance function is estimated, and then the effect of randomness of individual design variables on the probability performance function is analyzed. The effectiveness and accuracy of the method is investigated with a mathematical model and an induction motor.