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복합재료 테이퍼형 박판보로 모사한 비행기 날개의 동적응답제어에 관한 연구
나성수(Sungsoo Na),김수현(Soohyun Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A study of the vibration control of adaptive doubly-tapered cantilevered beams, simulating an aircraft wing, exposed to time-dependent external pulses is presented, whereas the beam structure encompasses non-classical properties such as transverse shear and anisotropy of their constituent materials, the active control capabilities are based upon the implementation of the adaptive feature is achieved through the converse piezoelectric effect that consists of the generation of localized strains in response to an applied voltage. Piezoactuators in the form of patches are considered. The active control involves the dynamic response to arbitrary time-dependent external pulses. The closed-loop dynamic response time histories are obtained via the use of the piezoelectrically induced moment control, and through the implementation of Fuzzy Logic Control that involves a maximum value constraint imposed on the input voltage. In addition to this active feedback control methodology, a passive one based upon the use of the directionality property of anisotropic composite material structures is also implemented. Numerical simulations emphasizing the performance of the adopted control strategies intended to contain and even reduce to zero the response quantities when time unfolds are presented, and pertinent conclusions are outlined.
나성수(Sungsoo Na),김윤중(Yoonjung Kim),박우범(Woobum Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
It is known thant the crystalline region of silk that contributes greatly to the high physical properties of silk fibers. This part is mostly alanine in spider silk, but in silkworm silk, glycine in crystalline region at high rate. In this study two models are used; one is that model used only alanine representative of spider silk, and the other is a model with both glacin and alanin representing silk silkworms is constructed. Finally, mechanical properties of two models are compared.
Response Characteristics of Aeroelastic Systems Using Robust Controller
나성수(Na, Sungsoo),정인주(Jeong, In-Joo) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.4
This paper presents a robust aeroelastic control methodology of a two dimensional flapped wing system exposed to an incompressible flow field. A robust controller is designed using a linear matrix inequality (LMI) approach for the multiobjective synthesis. The design objectives are to achieve a mix of $H_{\infty}$ performance and H₂ performance satisfying constraints on the closed loop pole locations in the presence of model uncertainties. Numerical examples are presented to demonstrate the effectiveness of LMI approach in damping out the aeroelastic response of 3-DOF flapped wing system.?????會??????????會??????????會?????????會?????蠻????會?????瀕????會??????솬??저會?저????????會??????????會???????????會????瀕????會?????????會????????㈀會?㈀備??????會????