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가변 벌점함수 유전알고리즘을 이용한 금형가공센터 고속이송체 구조물의 최적설계
최영휴,차상민,김태형,박보선,최원선 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
In this paper, a multi-step optimization using a G.A.(Genetic Algorithm) with variable penalty function is introduced to the structural design optimization of a high speed machining center. The design problem, in this case, is to find out the best cross-section shapes and dimensions of structural members which minimize the static compliance, the dynamic compliance, and the weight of the machine structure simultaneously. The first step is the cross-section shape optimization, in which only the section members are selected to survive whose cross-section area have above a critical value. The second step is a static design optimization, in which the static compliance and the weight of the machine structure are minimized under some dimensional constraints and deflection limits. The third step is a dynamic design optimization, where the dynamic compliance and the structure weight are minimized under the same constraints as those of the second step. The proposed design optimization method was successful applied to the machining center structural design optimization. As a result, static and dynamic compliances were reduced to 16% and 53% respectively from the initial design, while the weight of the structure are also reduced slightly.
금형가공센터 고속 이송체의 성능 안정화를 위한 설계개선 사례
최영휴,홍진현,최응영,이재윤,김태형,최원선 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
Heavy-weight head slides may cause excessive inertia impact & moment on the machine tool structure when they move or stop abruptly during operation. Consequently these inertia impact and unbalanced moment bring transient vibrations and rough sliding motions on the machine structure. Machine tool engineers have tried many kind of feed-slide designs in order to solve this problem; for example, the design optimization of the moving structure for minimum weight and maximum stiffness, box-in-box type slide design, and so on. In this article, force and moment equilibrium equations regarding to the inertia force & moment were derived for each one of a mold M/C's head slides. Furthermore, five different design configurations of head slide assembly were reviewed for its design improvement regarding to force & moment calculations and finite element structural analysis results.
리니어모터 이송시스템의 진동저감을 위한 이송속도 최적화
최영휴,최응영,김규탁 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
This paper presents feed rate optimizaton of a PMLSM driven feed-slide for mininum vibrations by smoothing velocity curve with finite jerk. First of all, the PMLSM was designed and made to reduce detent force. Next, a PMLSM driven feed-slide system was mathematically modeled as a 4-degree-of-freedom lumped parameter model. The key idea of our vibration minimization method is to find out the most appropriate smooth velocity curve with finite jerk. The validity of our proposed method has been verified by comparing computer simulation results of the feed-slide model with experimental ones.
암호화 기법을 이용한 재구성 가능형 마이크로 공작기계의 구조형태 창성 방법에 관한 연구
최영휴,장성현,김성민,김인수,박종권 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
This study presents a new method to generate machine structural configurations of MRmMT (Modular-Reconfigurable micro Machine Tool) systematically in the embodiment design step. The two core approaches to create machine tool structural configurations, in our proposed design method, are cryptographic mapping and machining function proving. Cryptographic mapping approach includes; 1) encoding all the structure modules into binary codes and then storing the graphics and digital codes in the module library, 2) cryptographic operating to create possible combined configurations from any two or several modules by using vector quadratic form expansion of the encoded binary codes, 3) to obtain the resulting structural configurations by decoding the operated binary codes using the module library. Machining function proving is to check up machining ability of a created machine tool configuration. Machining function proving is basically achieved by scalar product of the direction vectors of spindle (or tool) and table (or work piece) modules. Our method was well applied and succeeded in creating feasible machine configurations for a 3-axes reconfigurable micro milling machine from 7 modules spindle, table, bed, column, and 3-translational slide modules.
다기능 5축 복합가공기 구조물의 저진동, 고강성 구조 최적설계
최영휴,김성민,장성현,황현영,정용민 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
This paper presents structural design optimization of a 5-axes multi-tasking machine for light weight and minimum compliance using genetic algorithm based 2-step optimization method. The design problem, in this study, is to determine thickness of structural members which minimize the static compliance, dynamic compliance and weight of the machine structure simultaneously under several constraints such as dimensional design constraints. Optimization results showed apparent reduction in static and dynamic compliances at the spindle nose of the machine in spite of reduction in machine weight.
선반 기어박스의 기어열 - 축계 진동 해석 및 저감에 관한 연구
최영휴,박선균,배병태,정택수,김청수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
In this study, torsional and lateral vibrations of a gear box transmission system were analyzed theoretically using some mathematical models and examined to determine the causes of its excessive vibrations. As the results, it was found there exist possibility of resonance between gear mesh frequencies and lateral vibration mode of the transmission shaft during the third shifting mode operation. In order to avoid this resonance, we proposed changing the arrangement of gears on the transmission shaft. The measured vibration levels of the improved gear box were dramatically reduced. These results may be helpful to design a machine tool gear box with low noise and vibration.