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특성함수를 이용한 제한조건이 있는 천장크레인의 강건최적설계
홍도관(Do Kwan Hong),최석창(Seok Chang Choi),안찬우(Chan Woo Ahn) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.2
The correlation between the object function and the design parameter is shown on this paper by using the characteristic function for the mixed result of the structural analysis, the buckling analysis and the table of orthogonal array according to the original overhead crane's dimensional change. About the above two functions, the effectiveness of design change according to the change of design parameters could be estimated. Also, the overhead crane's weight is reduced up to 10.55 percent maintaining the structural stability according to the thickness of plate.
단체종목 운동선수들의 승부근성과 자기조절동기 및 팀 응집력의 관계
장익영(Chang, Ik-Young),안찬우(Ahn, Chan-Woo) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.1
This study examined the analysis of the relationship among the tenacity, self-regulated motivation and team cohesion of team athletes players. The number of the surveyed for this study was 313 who Participated in the team athletes players. The reliability and validity test of the questionnaire itself was conducted by using SPSS & AMOS Window 18.0 program: the result of descriptive analysis, factor analysis, correlation analysis, standard multiple regression analysis, path analysis are as follows; The results were as being follows. First, the tenacity is partially influences on the self-regulated motivation of team athletes players. Second, the tenacity is partially influences on the team cohesion of team athletes players. Third, self-regulated motivation in team athletes players is partially influences on the team cohesion of team athletes players. Lastly there is a causal relationship among the tenacity, self-regulated motivation and team cohesion of team athletes players.
실험계획법을 이용한 엔드밀 가공 시 최대가공온도와 표면조도에 미치는 가공조건에 관한 연구
홍도관(Do-Kwan Hong),안찬우(Chan-Woo Ahn),백황순(Hwang-Soon Baek),최석창(Seok Chang Choi),박일수(Il-Soo Park) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.3
To find the working condition is one of the important factors in precision machining. In this study, we analyzed maximum working temperature by infra-red camera and surface roughness in side wall end milling using design of experiment (DOE); RSM(response surface methodology), ANOM(analysis of means) and ANOVA(analysis of variance) by table of orthogonal array. ANOM and ANOVA are well adapted to select sensitivity of design variables for maximum working temperature and surface roughness. The effective design variables and their levels should be determined using ANOM, ANOVA. RSM is presented 2nd order approximation polynomial of maximum working temperature and surface roughness is composed with design variables. Therefore, it is expected that the proposed procedure using design of experiment ; table of orthogonal array, ANOM, ANOVA and RSM can be easily utilized to solve the problem of working condition.
교반기용 임펠러가 달린 축의 베어링 지지점에 따른 진동특성
홍도관(Do-Kwan Hong),안찬우(Chan-Woo Ahn),백황순(Hwang-Soon Baek),최석창(Seok-Chang Choi),박일수(Il-Soo Park) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.3
This paper deals with the dynamic characteristics of the impeller shaft model which is the most important part in developing the resin mixing machine. The can is rotating by air motor in mixing machine. Then the end of shaft is fixed. The bearing support is to increase the fundamental natural frequency. The natural frequency analysis using finite element analysis software are performed on the imported commercial impeller shaft model. This paper presents calculated bearing stiffness of Soda, Harris and modified Harris formula considering contact angle according to bearing supported position. The most important fundamental natural frequency of the impeller shaft except bearing support is around 13.932 ㎐. This paper presents one bearing and two bearings support position to maximize the 1st natural frequency. The maximized fundamental natural frequency is around 48.843 ㎐ in one bearing support and 55.52 ㎐ in two bearings support.
좌굴, 진동, 강도를 고려한 천장크레인의 경량화에 관한 연구
구경민(Kyung-min Gu),홍도관(Do-kwan Hong),최석창(Suk-chang Choi),한근조(Geun-Jo Han),안찬우(Chan-woo Ahn) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In this study, structural optimum design was applied to the girder of magnet over head crane. The optimization was carried out using ANSYS Code for the deadweight of girder, especially focused on the thickness of its upper, lower, side and reinforced plates. The weight could be reduced up to around 15 % with constraints of its deformation, stress, natural frequency and buckling strength. The structural safety was also verified by the buckling analysis of its panel structure. It might be thought to be very useful to design the conventional structures for the weight save through the structural optimization. Also this paper grasped the sensitivity influenced the design variables upon the objective function and the state variables.
안찬우,최석창,이희범,이봉진 東亞大學校 建設技術硏究所 1997 硏究論文集 Vol.21 No.1
This paper presents with dual dynamic vibration absorber consisting of mass, coil spring and oil damper attached to primary vibration system with damping. The effects of dual dynamic vibration absorber were investigated with optimizing equation which equalizes the height of amplitude ratio in the resonance frequency of the primary vibration system and numerically obtaining curves of resonance frequency ratio on the primary vibration system and dual dynamic vibration absorber according to mass ratio, natural frequency ratio and damping ratio of dynamic vibration absorber. The variation of amplitude ratio related to frequency ratio of primary vibration system is verified experimentally and theoretically according to dual dynamic vibration systems using computer program designed to find mutual relationship between dual dynamic vibration absorber.
안찬우,최석창 東亞大學校 1994 東亞論叢 Vol.31 No.1
The three dimensional transfer device for press employs vacuum cups on each finger for panel transfer. Although a high velocity drive is essential for the operation of this three dimensional transfer device, vibration in the finger caused by the dynamic response of the transfer mechanism creastes difficulties for the high velocity drive. To remedy this situation, we studied a simulation method for calculating the mode analysis of the three dimensional transfer device. Main points of the study results are as follows : 1) The natural frequency 10.3Hz is y-direction vibration on the drive part and 15.6 Hz is x-direction vibration. 2) The natural frequency 21.3Hz is y-direction vibration on the driven part. 3) The natural frequency 46.8Hz is bending motion on the feed-bar. 4) The natural frequency 89.5Hz is torsion vibration on the drive part. 5) The natural frequency 120.9Hz is bending motion on the plate. 6) The natural frequency 156.2Hz and 243.3 Hz are torsion vibration on the drive part and plate.