• Journal of the Korean Institute of Intelligent Systems
• /
• v.23 no.1
• /
• pp.65-71
• /
• 2013

In this paper, we address fault detection observer design problem of T-S fuzzy systems with sensor fault. To detect fault, T-S fuzzy model-based observer is used. By introducing $\mathfrak{H}$_ performance index, an observer is designed as sensitive to fault as possible. The fault is then detected by a fault decision logic. The design conditions are derived in terms of linear matrix inequalities. An illustrative example is provided to verify the effectiveness of the proposed fault detection technique.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.23 no.2
• /
• pp.133-138
• /
• 2013

This paper addresses a state consensus controller design technique of Takagi-Sugeno fuzzy model-based multi-agent systems in a continuous-time domain. We express the interconnection topology among the agents through graph theory. The design condition is represented in terms of linear matrix inequalities. Numerical example is provided to demonstrate the effectiveness of the proposed method.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.22 no.1
• /
• pp.94-99
• /
• 2012

This paper discusses a decentralized sampled-data control problem for large-scale nonlinear systems. The system is represented in Takagi-Sugeno's form. Next, we design a decentralized analog controller based on the overlapping decomposition technique. The final step is to apply the intelligent digital redesign scheme for converting the analog controller into the sampled-data one. Design condition is represented in terms of linear matrix inequalities. A simulation result is provided for the effectiveness of the proposed design method.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.1304-1305
• /
• 2015

본 논문은 타카기--수게노 퍼지 다개체 시스템의 상태 일치를 위해, 관측기 기반 출력 궤환 퍼지 제어기의 설계 기법을 제안한다. 각 개체간의 통신 네트워크는 그래프 이론을 통해 나타내며, 제어기의 설계 조건은 선형 행렬 부등식으로 표현한다.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.26 no.1
• /
• pp.50-55
• /
• 2016

This paper discusses a sampled-data controller design problem for nonlinear systems including singular perturbation. The concerned system is assumed to be modeled in Takagi--Sugeno (T--S) form. By introducing a novel Lyapunov function and an identity equation, the stability of the sampled-data closed-loop dynamics of the singularly perturbed T--S fuzzy system is analyzed. The design condition is represented in terms of linear matrix inequalities. A few discussions on the development are made that propose future research topics. Numerical simulation shows the effectiveness of the proposed method.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.22 no.6
• /
• pp.700-705
• /
• 2012

This paper addresses an intelligent digital redesign (IDR) technique for observer-based output-feedback control systems, in order to efficiently convert a pre-designed Takagi-Sugeno fuzzy model-based analog controller into a sampled-data one in the sense of state matching. A delta operator is used to get an asymptotic relation between the analog and the sampled-data control systems. The IDR problem is viewed as a minimization problem of the norm distances between linear operator to be matched. The condition is represented as linear matrix inequalities, and the separation principle on the IDR is shown.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.1745_1746
• /
• 2009

본 논문은 뉴트럴 퍼지 시스템의 안정도 분석 및 제어기 설계에 대해서 논의한다. 네트워크 상에서 발생하는 뉴트럴 타입 시간 지연을 모델링하며, 전체 뉴트럴 퍼지 시스템은 뉴트럴 타입 시간 지연을 가지는 비선형 시스템이 된다. 뉴트럴 퍼지 시스템을 타카기-수게노 (Takagi-Sugeno) 퍼지 시스템으로 모델링한다. 제안하는 퍼지 제어기를 모델링하는 뉴트럴 퍼지 시스템과 같은 멤버쉽 함수를 가지게 설계한다. 전체 폐루프 시스템의 안정도를 시간 지연 간격에 종속적이게 분석하고, 뉴트럴 퍼지 시스템을 안정화 시키는 퍼지 제어기 설계를 위한 충분 조건을 유도한다. 제안된 필요 충분 조건을 선형 행렬 부등식의 형태로 나타내고, 해를 통하여 퍼지 제어기의 이득값을 설계한다. 예제를 통하여 제안된 이론의 타당성을 확인한다.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.22 no.4
• /
• pp.441-447
• /
• 2012

This paper presents a design technique of a Takagi-Sugeno (T-S) fuzzy-model-based $H_{\infty}$ controller for autonomous underwater vehicles (AUVs). The design procedure aims to render the stabilizing controller which satisfies performance of the diving control for AUVs in the presence of the disturbance. A nonlinear AUV is modeled by the T-S fuzzy system through the sector nonlinearity. By using Lyapunov function, the sufficient conditions are derived to guarantee the performance of robust depth control in the format of linear matrix inequality (LMI). To succeed for diving control of AUV, we add the constraints on the diving and pitch angles in the LMI conditions. Through the simulation, we confirm the effectiveness of the proposed methodology.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.21 no.3
• /
• pp.302-306
• /
• 2011

This paper presents Takagi-Sugeno (T-S) fuzzy-model-based controller for depth control of autonomous underwater vehicles(AUVs). Through sector nonlinearity methodology, The nonlinear AUV is represented by T-S fuzzy model. By using the Lyapunov function, the design condition of controller is derived to guarantee the performance of depth control in the format of linear matrix inequality (LMI). An example is provided to illustrate the effectiveness of the proposed methodology.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.15 no.1
• /
• pp.92-97
• /
• 2005

This paper discusses an intelligent digital redesign technique for designing a fuzzy pulse-width-modulated (PWM) control. First when we are given a well-designed fuzzy analog control, the equivalent digital control is intelligently redesigned. Using the similar technique we intelligently redesign the fuzzy PWM control from the intelligently redesigned fuzzy digital control. A stabilizability of the intelligently redesigned PWM control is rigorously analyzed.