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梁保錫(B. S. Yang),安永供(Y. K. Ahn),崔沅鎬(W. H. Choi) 한국해양공학회 1992 韓國海洋工學會誌 Vol.6 No.2
This paper presents an approach for the derivation of frequency-dependent element matrices for vibration analysis of piping systems containing a moving medium. The dynamic stiffness matrix is deduced from transfer matrix, and, in turn, the frequency-dependent element matrices are derived. Numerical examples show that this method gives more accurate results than those obtained using the conventional static shape function based element matrices.
MR 유체를 이용한 새로운 액추에이터의 제안 설계 및 제어
김정수(J. S. Kim),안경관(K. K. Ahn),N.B.Kha,안영공(Y. K. Ahn) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
A new MR cylinder with built-in valves using Magneto - Rheological fluid (MR valve) is proposed for fluid power control systems. The MR fluid is a newly developed functional fluid whose obvious viscosity is controlled by the applied magnetic field intensity. This MR cylinder, which is composed of cylinder with small clearance and piston with electromagnet, has the characteristics of simple, compact and reliable structure. This paper presents a method to control the pressure of MR cylinder by using Generalized Predictive Control (GPC) algorithm. The differential pressure is controlled by applying magnetic field intensity to MR fluid. The use of GPC controller is to generate a control sequence by minimizing a cost function in such a way that the future system output is driven close to reference over finite prediction horizons. Experimental results from real time control using GPC method compared with conventional PID control method are also shown in this paper.
김성하(S. H. Kim),문덕홍(D. H. Moon),안영공(Y. K. Ahn),정석권(S. K. Jeong) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper deals with vibration isolation of a functional fluid mount for precision equipment of automobiles. The functional fluids such as MR(Magneto-Rheological) and ER(Electro-Rheological) fluid have variable damping elements which are changed by variations of the applied magnetic field strength or electric field strength. we present the robust control scheme, based on conventional sliding mode control, for the design of a stable controller that is capable of isolating the vibration due to various disturbances such as bump and sinusoidal excitations, and is insensitive to parametric uncertainties of the functional fluid mount. The controller is then realized by using a semi-active control condition in simulations.