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대칭면을 갖는 강체 진동계의 진동모드에 대한 기하학적 해석
단병주,최용제,Dan, Byeong-Ju,Choe, Yong-Je 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.1
Vibration modes obtained from a modal analysis can be better explained from a screw theoretical standpoint. A vibration mode can be geometrically interpreted as a pure rotation about the vibration center in a plane and as the twisting motion on a screw in a three dimensional space. This paper, presents the method to diagonalize a spatial stiffness matrix by use of a parallel axis congruence transformation. It also describes that the stiffness matrix diagonalized by a congruence transformation, can have the planes of symmetry depending on the location of the center of elasticity. For a plane of symmetry, any vibration mode can be expressed by the axis of vibration. Analytical solutions for the axis of vibration has been derived.
탄성적으로 지지된 광디스크 드라이버의 진동모드와 주파수 응답의 기하적 해석
단병주,최용제,Dan, Byeong-Ju,Choe, Yong-Je 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.2
Via screw theory, a vibration mode can be geometrically interpreted as a pure rotation about the vibration center in a plane and as a twisting motion on a screw in a three dimensional space. In thi s paper, applying the conditions that can be used to diagonalize the stiffness matrix by a parallel axis congruence transformation, the vibration modes and frequency response of an elastically suspended optical disc drive have been analyzed. It is first shown that the system has one plane of symmetry, which enables one to decouple the complicated vibration modes into two sets of modes independent of each other. Having obtained the analytical solutions for the axes of vibrations, the frequency response for a given applied input force has been demonstrated. Most importantly, it has been explained that this research result could be used in the synthesis process of a linear vibration system in order to improve the frequency response.
CAE 기법을 이용한 정보저장시스템의 Fanless 열설계
류호철 ( Ho Chul Ryu ),단병주 ( Byung Ju Dan ),최인호 ( In Ho Choi ),김진용 ( Jin Yong Kim ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
This study suggested fanless thelmal design using CAE technique for the information storage system under the serious themlal problem. At first, main heat 11o\v was controlled by CAE based fanless heat sink design not to influence sensitive optical pick -up sensor. Then, vent parametric studies found a thermal solution about highly concentrated case top heat due to fan less. These CAE results were verified by experimental methods. As a consequence of ne\vly designed thermal path, thermal specification of optical pick-up sensor was satisfied and fan less thenmll design for the information storage system was achieved.