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김민생(Min-Saeng Kim),이재철(Jae-Chul Lee),정석용(Suk-Yong Jeong),안성훈(Sung-Hoon Ahn),손지원(Jee-Won Son),조광제(Kwang-Je Cho),송철기(Chul Ki Song),박실룡(Sil Ryong Park),배태한(Tae-Han Bae) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.6
Structure evaluation for 70/15 T×105 m LLC(Level Luffing Crane)’s boom was conducted by Finite Element Method. Boom modeled with beam element was fixed by luff rope and boom mount and was received loads from self weight, luff hoisting, traveling motion, slewing motion, and wind force, etc. These applied loads were calculated using various factors presented in the reference standards and were inputted in the analysis model after considering about the adverse conditions of LLC. In the research, deformation, stresses, buckling of boom were evaluated by ANSYS. Structural safety of boom was confirmed in the results of numerical analysis.
SBR 가황물에서 용매추출 및 분리에 의한 PCA 오일 Type 확인법
김민생 ( Min Saeng Kim ),손경숙 ( Kyung Suk Sohn ),이중훈 ( Jung Hun Lee ),김익식 ( Ik Sik Kim ),최성신 ( Sung Seen Choi ) 한국고무학회 2012 엘라스토머 및 콤포지트 Vol.47 No.1
공정오일 내 다핵성 방향족 화합물(PCA)은 무게함량 대비 3%이상 함유한 경우 피부암을 일으키는 것으로 알려졌다. 저함량과 고함량 PCA 오일의 구분 기준은 PCA 함량 3%에 근거한다. 기준 함량 이상이면 발암성 물질인고함량 PCA 오일로 DAE가 있으며, 기준 함량 이하이면 인체에 안전한 저함량 PCA 오일로 TDAE, MES, 파라핀오일이 이에 속한다. 상기 4종류의 공정오일을 적용한 SBR 가황물에 용매 추출 및 분리로 오일을 정제한 후, FT-IR분광 기술을 이용하여 PCA 오일 종류을 결정하였다. 그리고 파라핀 오일이 적용된 SBR 가황물에서 고무 약품인 HPPD, TMDQ, 왁스, 공정조제(Structol-40MS)의 오일에 대한 영향을 연구하였다. 분리 정제된 오일로부터 저함량과 고함량 PCA 오일 구분은 방향족 치환체 흡수영역인 파수 864, 810, 754 및 파라핀 또는 나프텐 흡수영역인파수 721의 상대적인 흡수세기로 확인할 수 있었다. More than 3 wt% of polycyclic aromatics (PCAs) in process oil is known to cause skin cancer. The criterion of distinguishing between low PCA oil and high PCA oil is based on 3 wt% of PCA. High PCA oil is called as a carcinogen like distillate aromatic extract (DAE). Low PCA oil is considered as safety oils like treated distillate aromatic extract (TDAE), mild extract solvate (MES), and paraffinic oil. Four types of process oils such as DAE, TDAE, MES, and paraffinic oil purified by solvent extraction and separation skills from SBR vulcanizates were measured by FT-IR techniques. The effects of rubber chemicals such as N-1,3-dimethylbutyl-N`-phenyl-p-phenylnenediamine (HPPD), polymerized 2,2,4-trimethyl-1,2-dihydroquinoline (TMDQ), paraffin wax as antidegradants, and processing aid like Structol 40MS on paraffinic oil from SBR vulcanizates were also studied. The type of low or high PCA was identified by the relative abundance of absorbance at the aromatic substitution patterns of 864, 810, and 754 cm-1 and at the paraffinic or naphthenic pattern of 721 cm-1.
김민생(Min-Saeng Kim),이재철(Jae-Chul Lee),정석용(Suk-Yong Jeong),안성훈(Sung-Hoon Ahn),손지원(Jee-Won Son),조광제(Kwang-Je Cho),송철기(Chul Ki Song),배태한(Tae-Han Bae),박실룡(Sil Ryong Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Structure evaluation for 70/15 T×105 m LLC(Level Luffing Crane)'s boom was conducted by Finite Element Method. Boom modeled with beam element was fixed by luff rope and boom mount and was received loads from self weight, luff hoisting, traveling motion, slewing motion, and wind force, etc. These applied loads were calculated using various factors presented in the reference standards and were inputted in the analysis model after considering about the adverse conditions of LLC. In the research, deformation, stresses, buckling of boom were evaluated by ANSYS. Structural safety of boom was confirmed in the results of numerical analysis.
형상기억합금이 삽입된 복합재를 이용한 지능형 구조물의 제작
정범석(Beom-Seok Jung),김민생(Min-Saeng Kim),안성훈(Sung-Hoon Ahn) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Shape Memory Alloys (SMA) have been actively studied in many fields utilizing their high energy density. An SMA wire embedded composite, especially, could be used as smart material for load carrying structure and actuator. The composite material with high strength can sustain large load. but at the same time the high stiffness of the material limits the displacement range of the SMA wire embedded composite. In this research, an SMA wire embedded hybrid composite was fabricated to make a larger displacement than the SMA wire embedded single composite. The ∩-shaped hybrid composite is comprised of different stiffness materials, GFRP and silicone rubber, to increase the displacement range of the structure. The displacement of SMA wire embedded hybrid composite was examined by comparing curvature of the composite.
Al6061-T6 부식 특성에 미치는 표면 처리의 영향 연구
이두열(Dooyoul Lee),권혁준(Hyeok-Jun Kwon),김민생(Min-Saeng Kim) 대한기계학회 2020 大韓機械學會論文集A Vol.44 No.6
표면 처리가 Al6061-T6의 부식 특성에 미치는 영향을 연구하였다. 일반적으로 사용되는 크로메이트처리, 경질/연질 양극산화와 더불어 비교적 최근 개발된 타이타늄 플라즈마 전해산화를 적용하였다. 단면 및 표면 분석을 실시한 결과 플라즈마 전해산화법은 다공성 피막을 형성하였으며, 생성된 피막의 표면 거칠기는 비교 대상 중 가장 낮았다. 전기 화학 실험 및 부식 실험을 실시하여 부식 저항성을 확인하였다. 모재를 제외하고 크로메이트 처리가 가장 낮은 값을 나타내었고, 경질 양극산화가 가장 높은 값을 나타내었다. 플라즈마 전해산화된 시편의 분극 저항값은 연질 양극산화와 유사하였다. 부식 실험후 무게 감소는 경질 양극산화, 플라즈마 전해산화, 연질 양극산화 그리고 크로메이트 순으로 낮았다. The effect of surface treatment of Al6061-T6 on its corrosion characteristics was studied. In addition to conventional chromate conversion coating and hard and soft anodizing, a titanium plasma electrolytic oxidation (PEO) coating was applied on an Al6061-T6 substrate. Cross-sectional and surface analysis showed that PEO creates a porous layer. The surface roughness of PEO was the least among the compared surface treatments. Potentiodynamic and immersion tests were conducted to evaluate the corrosion resistance of each surface treatment. The linear polarization resistance was measured and PEO was found to have a higher resistance than chromate and soft anodizing. Immersion test results showed that the weight loss of the PEO sample was comparable with that of a soft anodized one.
베이지안 네트워크 기반 전시 파손항공기 임무수행능력 예측 모델
이두열(Dooyoul Lee),백세일(Seil Baek),김민생(Min-Saeng Kim),김신곤(Sinkon Kim) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.2
베이지안 네트워크에 기반한 전시 파손항공기 임무수행능력 예측 모델을 연구하였다. 항공기 손상평가 결과와 투입시간에 따른 임무수행능력을 산출하기 위해 베이지안 네트워크 모델을 개발하였다. 이 모델은 항공기의 주요구조, 보조구조, 그리고 복합재구조의 수리확률을 각 구조에 대한 손상평가 결과와 투입시간을 고려하여 계산한다. 각 구조에서 발생한 손상은 항공기의 기동성에 영향을 미치고, 궁극적으로 항공기의 임무수행능력에 영향을 미친다. 걸프전 A-10 항공기 파손 수리사례를 통해 임무수행능력을 바탕으로 한 항공기 수리 우선순위 결정과 임무배정에 대해 논의하였다. 손상평가, 예측 모델 개발, 교정, 그리고 타당성 검증이 전시 파손항공기의 임무수행능력 정량화에 전제 조건임을 확인하였다. The mission-readiness prediction model for a battle-damaged aircraft based on a Bayesian network (BN) was investigated in this study. The BN model was constructed to quantify the aircraft mission-readiness. The probabilities of repair for major, minor, and composite structural components were calculated considering the damage assessment results and repair duration for each model component. Damages on the structural components affected the maneuverability of aircraft and, eventually, the mission readiness. A case study using A-10 aircraft battle damage repair (ABDR) data obtained during the Gulf War was described. The method of mission assignment and repair prioritization based on the mission readiness were discussed. Damage assessment, model development, calibration, and validation were identified as essential prerequisites for the successful quantification of the mission readiness of ABDR.