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프린터 공진회피를 위한 Frame 강성설계 방법론 연구
유윤기(Yunki You),유병호(Byoungho Yoo),김태한(Taehan Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
In this paper, printer frame rigidity design methodology to avoid resonance with motor drive frequency is proposed at the initial design stage. For this purpose, the main vibration sources of the printer are analyzed to determine the relationship with frame natural frequency. Based on the results, the frequency distribution chart is prepared for the input vibration sources. Natural frequency of the main frame which is major structure of the printer was verified through testing and analysis. Natural frequency evaluation is not applied for conventional free boundary condition but stand (Placed on the floor or desk) boundary condition of the actual printing situation. Using the amplification factor and separation margin which are the analytical methods for the potential of resonance, main frame dynamic stiffness target considering the anti-resonance is presented.
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유윤기(Yun-Ki You),김정호(Jung-Ho Kim),김동석(Dong-Seok Kim),이경원(Kyung-Won Lee),허승진(Seung-Jin Heo),임홍재(Hong-Jae Yim),강대오(Dae-Oh Kang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This study was conducted to establish initial process for integrated optimal design considered multi-disciplinary constrained conditions. Multi-disciplinary constrained conditions mean that lightweight design, structure stiffness and safety. Process was constructed with 4-phase. First phase is formatting the base model. In this study, base model was simplified for efficiency of analysis and also verified with test data simultaneously. In second phase, effect analysis was performed to select design variables largely effecting on performance such as bending and torsion stiffness. Form second phase, totally 11 design variables were selected finally among the 105 variables. Third phase is formatting RBF type Meta-model established by using selected design variables and LHC design of experiment(DOE). In the last phase, optimum result was calculated by using the LS-OPT program. Bending, Torsion stiffness and roof crush reaction force were used for constrained conditions and mass minimization was object function for optimization. This study is first-year result among the three years plan. Therefore more design variables and detail load case for safety such as frontal, side, rear and damageability will be applied to next step study.
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차량 B.I.W 강성과 경량화를 고려한 사이드 단면 최적설계 프로그램 개발
유윤기(Yun Ki You),임홍재(Hong Jae Yim),김기창(Ki Chang Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the primary design step. an accurate and efficient design guide is important for design engineers. Otherwise design engineers have to go through trial and error for the desired design. In this paper, an integrated design program is presented. The presented design program named B-SOPT(Beam Section Optimization) provides an accurate and efficient design guide for the frame cross section of the vehicle side body structure. Therefore, using the B-SOPT, design engineers could find an optimum design of the pillar section without waste of time and energy in the primary design step. The B-SOPT is composed of vibration analysis, section property analysis and section optimization. Vibration analysis procedure is necessary to obtain target constraint(section property) for optimization. B.I.W vibration analysis model can be generated and joint stiffness also can be generated automatically by explicit formula derived using RSM (Response surface method) in the B-SOPT. For design engineers, B-SOPT is established for graphic user interface environment by visual C++. A design example is given to demonstrate the design procedure using the B-SOPT program.
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전기투석을 이용한 분리막 담수화 공정 배출 농축수의 이차 농축기술
문정기,박광석,유윤기,윤영기,Moon, Jeong-Ki,Park, Kwang-Seok,Yoo, Yoon-Ki,Yun, Young-Ki 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1
역삼투막을 이용한 해수담수화 공정에서 발생되는 농축수의 최소방류 및 회수율 극대화를 위한 공정으로 전기투석을 이용한 농축수의 이차 농축기술 연구를 수행하였다. 실험방법은 정전압운전 방식을 채용하였으며, 농축/탈염조의 용량비율, 전압별 변화 및 전해질을 농축수로 활용시 등에 대한 검토를 수행하였다. 사용한 막은 다가이온막을 채용하였으며, 전력효율을 최소화하며, 농축수의 농도를 극대화 및 탈염수의 농도를 최소화할 수 있는 조건 도출을 목표로 삼았다. 실험결과 농축/탈염조의 비율은 1대 5의 비율이, 전압의 경우 12V로 전해질의 경우 농축수를 이용시에도 효율에는 큰 차이가 발생하지 않았다. 이와 같은 실험조건에서 도출된 최적조건으로는 탈염수의 총용존고형물 농도가 5.32g/l, 이차 농축수의 염도는 17.07%이며 전력량은 탈염수 톤당 16.74kWh로 나타났다. This study is about the secondary concentration technology using electrodialysis process for minimum discharge and maximize recovery ratio from seawater desalination by reverse osmosis process. The experimental method adopted the constant voltage driving method and, concentrated/desalination volume capacity ratio changes, voltage changes and electrolyte types. Multi-ion membrane is used, aiming to derive conditions to minimize the TDS concentration of desalination water, to minimize the volumes of secnodary concentraion water and minimizing the power efficiency. The results of this study are as follows. The optimal ratio of concentraion/desalination volume is 1:5, the final TDS concentration of desalinated water is 5.32g/l, the final secnodary concentrated water salinity is 17.07% and electric energy demands of desalinated water is $16.74kWh/m^3$.
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강윤석(Yun Seok Kang),유윤기(Yunki You),강민석(Minseok Kang),임홍재(Hong Jae Yim),심영보(Youngbo Shim),박중경(Joongkyung Park),권웅(Woong Kwon),노경식(Kyungsik Roh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this research, an analysis and design method of a humanoid robot using multi-body kinematics and dynamics is presented. The proposed study is to develop a customized simulator to evaluate the prototype design in the early design stage. The simulator is not only to help humanoid developers to determine design parameters, such as dimensions, mass and inertia properties and actuator specifications, but also to analyze kinematics and dynamics characteristics for variable motions of the humanoid robot. Moreover, the simulator can demonstrate a walking pattern before building a prototype of a humanoid robot. Simulations of the humanoid robot using the customized simulator are performed to demonstrate the effectiveness and validity of the proposed research.
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