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송오섭,강호식 충남대학교 산업기술연구소 1999 산업기술연구논문집 Vol.14 No.2
Optimal vibration control of a symmetric rotor-anisotropic magnetic bearing system is studied in this paper, Magnetic bearing has been used to support spinning objects by electromagnetic force without mechanical contact and lubrication process. As a consequence, the system has attractive characteristics of the cleanliness, low energy loss and high performance operation. Furthermore, the electromagnetic force can be used to control the motion of the rotor system actively without extra actuation devices. In this paper, equations of motion for a 4-axis rigid rotor supported by anisotropic magnetic bearings are derived via Hamilton's principle and transformed to a state-space form for the optimal control in the LQR theory New scheme of choosing the state weighting matrix Q and the control weighting matrix R is proposed. The results proved the excellence of the proposed method of choosing Q, R matrices.
전자기장과 열하중을 받는 적층 복합재료 평판 구조물의 압전 진동제어
송오섭,좌비,박상윤,김선홍,강성환,서정석 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11
전자기장과 압전효과를 받는 복합재료 적층판의 FSDT 구조 모델을 정립하였다. Hamilton 원리를 적용하여 전자기장과 구성방정식에서 압전효과가 연성된 운동방정식을 유도하였다. 압전재료의 직접효과와 역전효과를 이용한 비례제어와 속도제어 로직을 통하여 자유진동 특성의 변화를 고찰하였다. 전자기장의 크기와 온도구배, 복합재료의 섬유각 등에 의한 자유진동 특성의 변화 경향을 고찰하였다. Structural model of laminated composite plate based on the First Order Shear Deformation Theory and subjected to a combination of electromagnetic and piezoelectric fields is developed. Coupled equations of motion are derived via Hamilton"s principle on the basis of electromagnetic equations and piezoelectric equations which are involved in constitutive equations. Proportional control and velocity feedback control logics are applied via boundary control moments and forces. Variations of dynamic characteristics of composite plate with applied electromagnetic field, temperature gradient, plate dimensions and ply angles are investigated and pertinent conclusions are derived .
송오섭,남경모,Song, Oh-Seop,Nam, Kyung-Mo 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.3
Electronic equipments and a missile carried by heavy trucks are often subjected to vibration and shock excitation during their transportation. Electronic equipments are so vulnerable to vibration and shock input that it is necessary to know in advance the vibration level of the truck which cause the damage of equipments. Road tests of a heavy truck carrying a canister on different road conditions such as paved road, unpaved road, and washboard are performed and the effect of road conditions on the vibration characteristics are analyzed. Vibration levels were measured at various locations of the truck along the path through which vibration was transmitted. This study reveals that the velocity of the truck as well as the road surface conditions are main factors which affect the vibration levels of the truck. The power spectrum density of the measured vibration signal and the factors affecting the PSD are also analyzed in this paper.
상.하 받침대를 갖는 대형 함정 탑재장비의 DDAM 해석을 위한 유한요소 모델링 기법에 관한 연구
송오섭(Song, Oh-Seop),김룡(Kim, Yong) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.4
Non-contact underwater explosions against surface ships could cause extensive equipment damage and render the ship inoperative. As an analytical method, DDAM(dynamic design and analysis method) is used for ship shock design. In this paper, in order to verify the finite element model of large shipboard equipment, modal test of equipment was performed. Major objective of this paper is to describe shock analysis methodology for large shipboard equipment attacked to the top and bottom foundations.
송오섭(Song, Oh-Seop),남경모(Nam, Kyung-Mo) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.11
Appropriate vibration model is required to predict in advance the vibration level of a large vehicle which carries sensitive electronic/mechanical equipments and drives often on the unpaved and/or off-road conditions. Central tire inflation system(CTIS) is recently adopted to improve the mobile operation of military and bulletproof vehicles. In this paper, full vehicle model(FVM) having 11 degrees of freedom and equipped with CTIS has been developed for a large vehicle which has $8\times8$ wheels$\times$driving wheels. Usability of the developed model is validated via road tests for three different modes (i.e. highway, country, and mud/sand/snow modes) and for various velocity conditions. The developed FVM can be used to predict the vibration level of the large vehicle as well as to determine the driving velocity criterion for different road conditions.