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평판의 1차 고유진동수가 최대가 되는 점지지의 최적위치선정에 관한 연구
홍도관,김문경,Hong Do-Kwan,Kim Moon-Kyung 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.7
The free vibration analyses of the isotropic and CFRP laminated composite rectangular plates with point supports at the fix edge is performed by FEM. We showed optimal position and mode shape of point supports that maximized fundamental natural frequency of the isotropic and CFRP laminated composite rectangular plates by each aspect ratio and the number of point supports.
엔드밀 가공시 진동, 표면거칠기, 절삭온도에 미치는 최적가공조건에 관한 연구
홍도관(Hong, Do-Kwan),김동영(Kim, Dong-Young),안찬우(Ahn, Chan-Woo) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
End-milling has been used widely in industrial system because it is effective to a material manufacturing with various shapes. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in precision machine part and electronic part. The optimum mechanical vibration of main spindle, surface roughness and cutting temperature have an effect on end-milling condition such as, cutting direction, revolution of spindle, feed rate and depth of cut, etc. Therefore, this study carried to decide the working condition for optimum mechanical vibration of main spindle, surface roughness and cutting temperature using design of experiments, ANOVA and characteristic function. From the results of experimentation, mechanical vibration has an effect on revolution of spindle, radial depth of cut, and axial depth of cut. The surface roughness has an effect on cutting direction, revolution of spindle and depth of cut. And then the optimum condition used design of experiments is upward cutting In cutting direction, 600 rpm in revolution of spindle, 240 mm/min in feed rate, 2 mm in axial depth of cut and 0.25 mm in radial depth of cut. By design of experiments and characteristic function, it is effectively represented shape characteristics of mechanical vibration, surface roughness and cutting temperature in end-milling.
홍도관(Hong, Do-Kwan),정재부(Jeong, Jae-Boo),정승욱(Jung, Seung-Wook),강현욱(Gang, Hyun-Wook),안찬우(Ahn, Chan-Woo) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.11
This paper deals with the analysis of interior noise and low frequency noise characteristic for the Busan citizens to use public transport, Busan Metro Line 3. The interior noise evaluation index, articulation index(AI) is evaluated the lower value about average 22 % in a whole range, this is difficult to have a conversation. Also, noise criteria(NC) curve is partially evaluated as NC-65 below 2000 Hz, space type is evaluated as factories. Another of interior noise evaluation index, preferred speech interference level(PSIL) is evaluated the upper value about average 66 dB(A) in a whole range, this is evaluated to be interrupted. In the case of low frequency noise(20~200 Hz), the measurement of low frequency noise is assessed largely beyond noise criteria of ISO 226. The low frequency noise should be reduced because low frequency noise affects on psychological stress and displeasure although low frequency noise is not recognized by auditory sense. The low frequency noise criteria and guideline will be enacted from now on in Korea.
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.
측벽 엔드밀 가공 시 반응표면법을 이용한 최적 가공조건
홍도관(Hong, Do-Kwan),최재기(Choi, Jae-Gi),박진우(Park, Jin-Woo),백황순(Baek, Hwang-Soon),안찬우(Ahn, Chan-Woo) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.11
Working condition is one of the most important factors in precision working. In this study, we optimized the vibration acceleration of working progress direction using RSM(response surface methodology) by table of orthogonal array. RSM was well adapted to make analytic model for minimizing vibration acceleration, created the objective function and saved a great deal of computational time. Therefore, it is expected that the proposed optimization procedure using RSM can be easily utilized to solve the optimization problem of working condition. The experimental results of the surface roughness and vibration acceleration showed the validity of the proposed working condition of side wall end-milling as it can be observed.