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최영휴(Y. H. Choi),장성현(S. H. Jang),김인수(I. S. Kim),오창환(C. H. Oh),조용주(Y. J. Cho) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this paper, dynamic analysis a spindle system for 5-axis multi-tasking machine by using ADROS, which is our own developed S/W for dynamic design analysis of rotor systems. As the result, the critical speed of our spindle system for 5-axis multi-tasking machine is above twice of the operating speed.
모듈러 공작기계의 구조형태 창성을 위한 컴퓨터 프로그램
장성현(S. H. Jang),김성민(S. M. Kim),조성범(S. B. Jo),최영휴(Y. H. Choi) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper describes a design program to generate feasible structural configurations of modular reconfigurable machine tool from some modules. This program includes module library which defines module posture vector for each module and mutual connectivity coefficient matrix for adjacent two modules. Our design method use cryptographic mapping. By using cryptographic mapping, all the structure modules can be encoded into binary codes and then stored the graphics and digital codes in the module library. We carried out cryptographic operating to create possible combined configurations from any two or several modules by using vector quadratic form expansion of the encoded binary codes. Consequently, we can obtain the resulting structural configurations by decoding the operated binary codes using the module library.
끝단 질량을 갖는 외팔보 형태의 다자유도 마이크로 동감쇠기에 관한 연구
장성현(S. H. Jang),최영휴(Y. H. Choi),박종권(J. K. Park) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this study, a cantilever typed multi-degree-of-freedom micro dynamic damper is designed for micro-machine tool to reduce or to avoid its resonant vibrations. The proposed micro dynamic damper consists of three cantilever beams and a rigid body suspended from the cantilever beam. For dynamic analysis and design synthesis, a vibrating system with the dynamic damper is mathematically modelled as a lumped parameter model, in which cantilever beams and rigid body are idealized as springs and a mass respectively. Natural frequencies and harmonic response function of the mathematical model are obtained by using modal analysis theory. From the result, the spring constants and mass of the dynamic damper which eliminates the resonant vibrations of the main system can be determined. A case study shows the proposed cantilever typed micro dynamic damper can successfully reduce vibrations of the main machine, in the three different directions, at a specified resonant frequency.