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가진 시험법을 이용한 다기능 5축 복합가공기 구조물의 동강성 평가
김성민(S. M. Kim),장성현(S. H. Jang),김실근(S. G. Kim),하종식(J. S. Ha),최영휴(Y. H. Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
This paper describes a case study on dynamic stiffness analysis of a 5-axes multi-tasking machine tool. Dynamic stiffness is one of important factors regarding to machine tool accuracy. Dynamic stiffness, in this study, were obtained by using both FEM analysis and an experimental dynamic stiffness test, that is a random excitation test by using a hydraulic exciter. Both the theoretical and experiment analysis results showed good agreement with each other. Finally, some discussion and review from the view point absolute dynamic stiffness were made based on the analysis results.
김성민(S. M. Kim),장성현(S. H. Jang),김실근(S. G. Kim),하종식(J. S. Ha),최영휴(Y. H. Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This paper describes a case study on dynamic characteristics analysis of a 5-axis multi-tasking machine tool of ram-head typed. Natural frequency and corresponding vibration modes of the machine tool structure were obtained by using both FEM modal analysis and an experimental modal test(impulse hammer test). Both the theoretical and experiment analysis results showed good agreement with each other. Finally, some discussion and review, from the view point of resonance vibration and/or mode coupled chatter, were made based on the analysis results.
선박 엔진 크랭크샤프트 가공용 다기능 5축 복합가공기의 구조설계
최영휴(Y. H. Choi),김실근(S. G. Kim),장성현(S. H. Jang),조용주(Y. J. Jo),하종식(J. S. Ha) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
This paper describes a case study on structural design of a 5-axes multi-tasking machine tool for machining marine engine crankshaft. We carried out static and dynamic structural analysis for several design alternatives of the machine tool by using ANSYS. From the analysis results, we could decide a feasible design candidate. And then we carried out design optimization of the design candidate for light weight and minimum compliance using genetic algorithm. After the prototype machine tool was made, natural frequency and dynamic stiffness of the machine tool structure were obtained by using a experimental modal test and a random excitation test, respectively. The test results showed that the prototype machine tool has sufficient structural stiffness and high natural frequency.
마이크로 밀링 머신의 저진동 경량화를 위한 구조 최적설계
최영휴(Y. H. Choi),장성현(S. H. Jang),김성민(S. M. Kim),김실근(S. G. Kim),박종권(J. K. Park) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
This paper presents structural design optimization of micro milling machine for lightweight and minimum vibrations using a genetic algorithm. The design problem is to find out thickness of structural members which minimize vibrations, the static compliance, dynamic compliance and weight of a micro milling machine structure under several constraints such as dimensional constraints, maximum deflection limit, safety factor criterion and maximum vibration amplitude limit. Optimization results showed a little reduction in compliance and vibration amplitude at the spindle nose of micro milling machine in spite of decrease in machine weight.
마이크로 밀링 머신의 저진동 경량화를 위한 구조 최적설계
최영휴(Y. H. Choi),장성현(S. H. Jang),김성민(S. M. Kim),김실근(S. G. Kim),박종권(J. K. Park) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
This paper presents structural design optimization of micro milling machine for lightweight and minimum vibrations using a genetic algorithm. The design problem is to find out thickness of structural members which minimize vibrations, the static compliance, dynamic compliance and weight of a micro milling machine structure under several constraints such as dimensional constraints, maximum deflection limit, safety factor criterion and maximum vibration amplitude limit. Optimization results showed a little reduction in compliance and vibration amplitude at the spindle nose of micro milling machine in spite of decrease in machine weight.
선박 엔진 크랭크샤프트 가공용 다기능 5축 복합가공기의 구조설계
최영휴,김실근,장성현,조용주,하종식 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
This paper describes a case study on structural design of a 5-axes multi-tasking machine tool for machining marine engine crankshaft. We carried out static and dynamic structural analysis for several design alternatives of the machine tool by using ANSYS. From the analysis results, we could decide a feasible design candidate. And then we carried out design optimization of the design candidate for light weight and minimum compliance using genetic algorithm. After the prototype machine tool was made, natural frequency and dynamic stiffness of the machine tool structure were obtained by using a experimental modal test and a random excitation test, respectively. The test results showed that the prototype machine tool has sufficient structural stiffness and high natural frequency.