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강호식(Kang, Ho-Shik),정남희(Jeong, Namheul),윤일성(Yoon, Il-Soung),송오섭(Song, Ohseop) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
In this study, the equations of motion of a rigid rotor supported by magnetic bearings are derived via Hamilton's principle, and transformed to a state-space form for control purpose. The optimal motion control of rotor magnetic bearing system based on the LQR(linear quadratic regulator) theory is addressed. New schemes related to the selection of the state weighting matrix Q and the control weighting matrix R involved in the quadratic functional to be minimized are proposed. And the robust control of the system with an LMI(linear matrix inequality) based H$_{\infty}$ theory is dealt with in this paper. Loop shapings of TFM (transfer function matrix) are used to increase the performance of control capability of the system. The control abilities of LQR and H$_{\infty}$ controller are compared by simulation and experimental tests and show that the capability of H$_{\infty}$ controller is superior to that of LQR.
압전감지기 및 압전작동기를 이용한 복합재료 회전축의 진동 및 안전성 제어
정남희,강호식,윤일성,송오섭,Jeong, Nam-Heui,Kang, Ho-Shik,Yoon, Il-Sung,Song, Oh-Seop 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.2
A study on the control of free vibration and stability characteristics of rotating hollow circular shafts subjected to compressive axial forces is presented in this paper. Both passive structural tailoring technique and active control scheme via collocated piezoelectric sensing and actuation are used in the study Gyroscopic and centrifugal forces combined with the compressive axial force contribute to the occurrence of divergence and flutter instabilities of the rotating shaft. The dual methodology based on the passive and active control schemes shows a high degree of efficiency toward postponement of these instabilities and expansion of the domain of stability of the system. The structural model of the shaft is based on an advanced thin-walled beam structure that includes the non-classical effects of transverse shear, anisotropy of constituent materials and rotatory inertia.
강호식,송오섭 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.2
Magnetic bearing has been adopted to support a rotor by electromagnetic force without mechanical contact and lubrication process. The recent growth of magnetic bearing applications in many industrial fields requires more accurate design of bearing-rotor system. Due to external forces and uncertainties of magnetic baring system, the actual performance and stability may be worse than it is designed. This paper describes the governing equations of rotor magnetic bearing systems and/or the designing of robust controller via standard H-(∞), control problem. The system stability and response characteristics are studied by simulations and veri6ed with experimental results.
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.