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정승원(Jeong Seung Won),정원지(Chung Won Jee),김명식(Kim Myung Sik),전주열(Jeon Ju Yeal) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.1
This paper provides a methodology for extracting design data from the three-dimensional design software SolidWorks<SUP></SUP>®<SUP></SUP>, which isbased on the existing trochoid pump design equations thatare used by hydraulic field engineers. The data extracted from the SolidWorks<SUP></SUP>®<SUP></SUP> model are input to a hydraulic analysis software AMESim<SUP></SUP>®<SUP></SUP> model todetermine the design factors that can influence the properties of a trochoid pump. On the basis of the simulation results, this paper proposesa methodto reduce the flow loss by adjusting the outlet angle of the trochoid pump. This proposal was verified by using actual experimental results, which confirmed that adjusting the outlet angle can increase the flow rate. Hence,the results presented in this paper can contribute to the prototyping of a trochoid pump by reducing the cost associated with a trial-and-error design.
임정숙(Jeong-Suk Lim),정원지(Won-Jee Chung),이춘만(Choon-Man Lee) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.5
Spindle design is very important to improve the competitive power in production cost of high quality machine tools. In this paper, spindle system was designed with built-in motor can be used to simplify the structure, to improve the machining frexibility, and to perform high speed machining of machine tools. According to the spindle speed is high, spindle end's displacement is considered to be an important subject. To know how the unbalanced mass affect to the spindle end displacement, modal analysis was performed and analyzed. When, unbalanced mass was 0g, spindle front end displacement was a minimum, and unbalanced mass was 20g, spindle rear end displacement was kept to a minimum.
40,000rpm 고속 주축의 정ㆍ동특성 향상을 위한 베어링 위치 선정
임정숙(Jeong Suk Lim),정원지(Won Jee Chung),이춘만(Choon Man Lee) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.1
Spindle design is very important for the improvement of the competitive power in production cost of high quality machine tools. The important factor in spindle design is not only to improve the natural frequency of spindle but also to reduce displacement of spindle end. In this paper, parameters those influence on static and dynamic stiffness of high-speed spindle have selected form preceding studies. And those selected parameters are applied to Taguchi Method. To perform FEM analysis, bearing conditions are selected with optimized condition. To know how to improve static and dynamic stiffness of machine tool spindle, natural frequency and displacement of spindle end are obtained by FEM analysis. The Taguchi Method was used to draw optimized condition of bearing position and it's stiffness. From these results, amplitude of vibration is enough good less than 3㎛ pk-pk of the spindle of 40,000rpm manufactured in this work by the optimal design.
예인체의 투하 및 인양 자동화를 위한 사변형 Overboarding Mechanism의 최적설계
강석정(Seok Jeong Kang),정원지(Won Jee Chung),박성학(Seong Hak Park),최종갑(Jong Kap Choi),김효곤(Hyo Gon Kim),이준구(Jun Ku Lee) 한국생산제조학회 2017 한국생산제조학회지 Vol.26 No.1
A crane is typically used as a means to lift and load equipment or materials. A surface vessel uses a towed object for underwater activity. Such a mechanism for dropping and lifting of equipment is necessary, and is called an overboarding unit. The present study is focused on the overboarding unit used for a crane structure. This paper deals with new overboarding mechanism design and GA-based MATLAB<SUP>®</SUP> optimization. By using a quadrilateral link mechanism, it is possible to set the constraint function for optimizing the GA method. The optimization with MATLAB<SUP>®</SUP> is followed by the SolidWorks<SUP>®</SUP> simulation and verification. When applying the proposed mechanism, the operator is expected to have a big advantage in safety and efficiency of operations. Furthermore, the technology developed in this study will be helpful in similar circumstances and in the proposed mechanism.
LabVIEW<SUP>®</SUP>를 이용한 6축 수직 다관절 로봇의 퍼지 로직이 적용된 게인 스케줄링 프로그래밍에 관한 연구
강석정(Seok-Jeong Kang),정원지(Won-Jee Chung),박승규(Seung-Kyu Park),노성훈(Sung Hun Noe) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.4
As the demand for industrial robots and Automated Guided Vehicles (AGVs) increases, higher performance is also required from them. Fuzzy controllers, as part of an intelligent control system, are a direct control method that leverages human knowledge and experience to easily control highly nonlinear, uncertain, and complex systems. This paper uses a LabVIEW<SUP>Ⓡ</SUP>-based fuzzy controller with gain scheduling to demonstrate better performance than one could obtain with a fuzzy controller alone. First, the work area was set based on forward kinematics and inverse kinematics programs. Next, LabVIEW<SUP>Ⓡ</SUP> was used to configure the fuzzy controller and perform the gain scheduling. Finally, the proposed fuzzy gain scheduling controller was compared with to controllers without gain scheduling.
반도체 웨이퍼 연삭용 에어 베어링 시스템의 강성 도출 연구
박민성(Min-Seong Park),정원지(Won-Jee Chung),신성우(Sung-Woo Shin),정보경(Bo-Gyeong Jeong),송의영(Eui-Young Song),김동건(Dong-Gun Kim) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.8
Following Coronavirus disease 2019 (COVID-19), inflation in the U.S. and the inflation reduction act (IRA) of 2022 have underscored the necessity of localizing semiconductor equipment development. In the semiconductor equipment process, the double-side grinding process in wafer manufacturing utilizes porous air bearings for precision polishing, crucial for achieving ultra-precision and high rigidity by removing minor deviations on the wafer surface. This study analyses the structure of two radial air bearings and two thrust air bearings installed on spindles used in the precision polishing of semiconductor wafers, and performs flow analysis to determine rigidity. With an air gap of 10 micrometers, eccentricity was set between 1 to 5 micrometers, and pressure variation according to eccentricity was analyzed. Axial and radial stiffness were calculated using stiffness derivation formulas. The average radial stiffness measured 245.56 N/μm, while axial stiffness measured 1247.86 N/μm. Comparison with test device results, which indicated 200 N/μm for radial stiffness and 1000 N/μm for axial stiffness, confirmed error rates validating the stiffness derivation formula: the radial error rate was 22.78%, and the axial error rate was 24.78%.