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전기 유동유체를 함유하는 지능외팔보의 진동특성 및 제어 실험적 고찰
최승복,박용군,서문석,Choi, Seung-Bok,Park, Yong-Kun,Suh, Moon-Suk 대한기계학회 1993 대한기계학회논문집 Vol.17 No.7
This paper reports on a proof-of-concept experimental investigation focused on evaluating the vibration characteristics and control of smart hollow cantilever beams filled with an electro-rheological(ER) fluid. The beams are considered to be of uniform viscoelastic materials and modelled as a viscously-damped harmonic oscillator. Electric field-dependent natural frequencies, loss factors and complex moduli are evaluated and compared among three different beams : two types of different volume fraction of ER fluid and one type of different particle concentration of ER fluid by weight. Modal characteristics of the beams are observed in both the absence and the presence of electric potentials. It is also shown that by constructing active control algorithm the removal of structural resonances and the suppression of tip deflection are obtained. This result provides the feasiblility of ER fluids as an active vibration control element.
이산시간 퍼지-슬라이딩모드를 이용한 스마트구조물의 강건진동제어
최승복,김명석,Choi, Seung-Bok,Kim, Myoung-Suk 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.11
This paper presents a new discrete-time fuzzy-sliding mode controller for robust vibration control of a smart structure featuring a piezofilm actuator. A governong equation of motion for the smart beam structure is derived and discrete-time codel with mismatched uncertainties such as parameter variations is constructed ina state space. A discrete-time sliding mode control system consisting of an equivalent controller and a discontinuous controller is formulated. In the design of the equivalent part, so called an equivalent controller separation method is adopted to achieve vzster convergence to a sliding surface without extension of a sliding region, in which the system robustness maynot be guaranteed. On the other hand, the discontinuous part is constructed on the basis of both the sliding and the convergence conditions using a time-varying feedback gain. The sliding moide controller is then incorporated with a fuzzy technique to appropriately determine principal control parameters such as a discountinuous feedback gain. Experimental implementation on the forced and random vibraiton controls is undertaken in order to demonstrate superior control performance of the proposed controller.
빠르고 강건한 추적제어를 위한 새로운 슬라이딩 서피스 설계
최승복(Seung-Bok Choi),박동원(Dong-Won Park) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
A new sliding surface for a varaible structure control(VSC) law is employed to achieve fast and robust path tracking in a class of second-order nonlinear uncertain dynamical systems. The surface initially passes arbitrarily given initial conditions and subsequently moves towards a predetermined surface via rotating or/and shifting. We call it as a moving sliding surface(MSS). The surface is then incorporated with the VSC law which is constructed by imposing the sliding conditions in a special way. We primarily enforce the conditions which assume that once the system state is on a sliding surface that it is driven towards the zero state. Using the VSC law associated with the MSS, it is shown that the tracking behaviors are remarkably improved in the sense of the fastness and the robustness.