Browsing by Author "Yu, SS"

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Application of neural-fuzzy modeling and optimal fuzzy controller for nonlinear magnetic bearing systems
(2003)
Yu, SS
;
Wu, SJ
;
Lee, TT
;
電控工程研究所
;
Institute of Electrical and Control Engineering
In this paper we apply a new approach, called optimal fizzy control based on linear TS type fuzzy model, to deal with nonlinear magnetic bearing systems. The linear TS type fuzzy model is used to represent the nonlinear plant To obtain the linear TS fuzzy model, we use linear self-constructing neural fuzzy inference network(linear SONFIN) to model the nonlinear system. Once the TS fuzzy model of the magnetic bearing system is obtained, the optimal fuzzy controller can be applied if the system is completely controllable and observable. Simulation results show that the proposed optimal fuzzy controller can operate in widely range of shaft position.
Impacts of the self-Raman effect and third-order dispersion on pulse-squeezed state generation using optical fibers
(1995-12-01)
Yu, SS
;
Lai, YC
;
交大名義發表
;
光電工程學系
;
National Chiao Tung University
Based on a newly developed general quantum theory of nonlinear optical pulse propagation, the influences of the self-Raman effect and third-order dispersion on the achievable squeezing ratio in squeezing experiments with optical fibers at both the 1.3- and 1.55-mu m wavelengths are studied. In the presence of these effects, squeezing still survives, but the achievable squeezing still reach a limit as the propagation distance increases. Temperature dependence of the squeezing ratio is also examined. (C) 1995 Optical Society of America
Off-axial pulse propagation in graded-index materials with Kerr nonlinearity - A variational approach
(1996-07-01)
Chien, CH
;
Yu, SS
;
Lai, YC
;
Wang, JP
;
光電工程學系
We analyze off-axial, self-focused pulse propagation in graded-index Kerr materials with the variational method. Equations which determine the characteristics of the beam, namely the optical path, the wavefront curvature, the beam width, and the pulse duration are derived and solved. We show that continuously adjustable negative group-velocity dispersion can be generated by off-axial propagation, and for pulse energy smaller than a critical value, negative group-velocity dispersion and Kerr nonlinearity warrant the existence of stable spatio-temporal solitary pulses.
Off-axial pulse propagation in graded-index materials with Kerr nonlinearity - A variational approach
(1996-07-01)
Chien, CH
;
Yu, SS
;
Lai, YC
;
Wang, JP
;
光電工程研究所
We analyze off-axial, self-focused pulse propagation in graded-index Kerr materials with the variational method. Equations which determine the characteristics of the beam, namely the optical path, the wavefront curvature, the beam width, and the pulse duration are derived and solved. We show that continuously adjustable negative group-velocity dispersion can be generated by off-axial propagation, and for pulse energy smaller than a critical value, negative group-velocity dispersion and Kerr nonlinearity warrant the existence of stable spatio-temporal solitary pulses.
Optimal fuzzy control of radial active magnetic bearing systems
(2003)
Yu, SS
;
Wu, SJ
;
Lee, TT
;
電控工程研究所
;
Institute of Electrical and Control Engineering
In this paper, a neural-fuzzy approach to develop the optimal fuzzy control of a highly nonlinear radial current-controlled active magnetic bearing (AMB) systems is proposed. A linear self-constructing neural fuzzy inference network is proposed to neural-fuzzy modeling the radial current-controlled AMB system first. Then, the corresponding optimal fuzzy control design scheme is obtained to stabilize the AMB system with minimize current consumption. Simulation results show that the proposed optimal fuzzy controller can operate in widely range of shaft position.