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Auto_LISP을 이용한 기어설계 프로그램 개발에 관한 연구
이경원,반재삼,김종석,조규종 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.2
After investigating repeatedly result obtained through gear stress analysis, we make a determination of an optimal gear shape. But its design process was not only complex but also difficult to get a precise profile curve from operating by hand. In this study, rotating shape of gear profile curves was generated automatically with standard spur gear, equivalent helical gear, shifted gear & pinion by using developed program which is using Auto_LISP language in Auto-CAD. This program which can design rapidly gear shapes will successfully support gear designing and manufacturing for Small & Medium companies.
시효 처리에 따른 Sn-57 wt. % Bi-0.5 wt. % Zn 땜납/Cu 기판 접합부의 특성
조규종,이도재,이경구,오주석 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.11
The shear strength and creep properties of Sn-57 wt.%Bi/Cu and Sn-57 wt.%Bi-0.5 wt.%Zn/Cu joints were studied. Modified double lap shear solder joints were aged for 60 days at 80℃ and then loaded to failure in shear. The shear strength of solder/Cu joints was decreased with aging treatment and the rapid decrease in shear strength of the Sn-57 wt.%Bi/Cu joint was appeared in the 60 days aged specimen. The crack path of aged solder/Cu joint were changed from through the solder to through the interface between Cu substrate and reaction layer with Zn addition. But the crack path under creep test was through the solder regardless of Zn addition.
Cho, Youn-Kyung,Pyo, Myoung-Ho,Zong, Kyu-Kwan The Korean Electrochemical Society 2010 한국전기화학회지 Vol.13 No.1
New monomers, possessing various alkyl substituents on propylene dioxypyrrole, were synthesized. The monomers could be easily polymerized to produce highly conductive and soluble polymers. The corresponding polymers showed excellent solubility, retaining electrochemical and optical properties of their parent polymer [poly(propylene dioxypyrrole)]. The conductivities of chemically prepared polymers were quite high in a range of 20 and $60\;Scm^{-1}$. Solubility of the polymer in a common organic solvent was as high as no polymer is deposited on an electrode. The redox potentials of the electrochemically prepared polymers revealed quite stable electro-activity during repeated redox switching up to 500 times. The optoelectrochemistry studies also showed distinct color changes of the polymers upon changing the doping state, indicating strong absorption peaks at 400~600 nm in reduced states and complete bleaching in fully oxidized states.
Dynamic Stress Analysis of Vehicle Frame Using a Nonlinear Finite Element Method
Gyu Ha Kim,Kyu Zong Cho,In Bum Chyun,Gi Seob choi 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.10
Structural integrity of either a passenger car or a light truck is one of the basic requirements for a full vehicle engineering and development program. The results of the vehicle product performance are measured in terms of durability, noise/vibration/harshness (NVH), crash worthiness and passenger safety. The level of performance of a vehicle directly affects the marketability, profitability and, most importantly. the future of the automobile manufacturer. In this study. we used the Virtual Proving Ground (VPG) approach for obtaining the dynamic stress or strain history and distribution. The VPG uses a nonlinear, dynamic. finite element code (LS-DYNA) which expands the application boundary outside classic linear, static assumptions. The VPG approach also uses realistic boundary conditions of tire/road surface interactions. To verify the predicted dynamic stress and fatigue critical region, a single bump run test, road load simulation. and field test have been performed. The prediction results were compared with experimental results, and the feasibility of the integrated life prediction methodology was verified.
Dynamic Stress Analysis of Vehicle Frame Using a Nonlinear Finite Element Method
Kim, Gyu-Ha,Cho, Kyu-Zong,Chyun, In-Bum,Park, Seob The Korean Society of Mechanical Engineers 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.10
Structural integrity of either a passenger car or a light truck is one of the basic requirements for a full vehicle engineering and development program. The results of the vehicle product performance are measured in terms of durability, noise/vibration/harshness (NVH), crashworthiness and passenger safety. The level of performance of a vehicle directly affects the marketability, profitability and, most importantly, the future of the automobile manufacturer. In this study, we used the Virtual Proving Ground (VPG) approach for obtaining the dynamic stress or strain history and distribution. The VPG uses a nonlinear, dynamic, finite element code (LS-DYNA) which expands the application boundary outside classic linear, static assumptions. The VPG approach also uses realistic boundary conditions of tire/road surface interactions. To verify the predicted dynamic stress and fatigue critical region, a single bump run test, road load simulation, and field test have been performed. The prediction results were compared with experimental results, and the feasibility of the integrated life prediction methodology was verified.