• Journal of Mechanical Science and Technology
• /
• 제20권7호
• /
• pp.950-960
• /
• 2006

An output time delay always exists in practical systems. Analysis of the delay phenomenon in a continuous-time domain is sophisticated. It is appropriate to obtain its corresponding discrete-time model for implementation via a digital computer. A new method for the discretization of nonlinear systems using Taylor series expansion and the zero-order hold assumption is proposed in this paper. This method is applied to the sampled-data representation of a nonlinear system with a constant output time-delay. In particular, the effect of the time-discretization method on key properties of nonlinear control systems, such as equilibrium properties and asymptotic stability, is examined. In addition, 'hybrid' discretization schemes resulting from a combination of the 'scaling and squaring' technique with the Taylor method are also proposed, especially under conditions of very low sampling rates. A performance of the proposed method is evaluated using two nonlinear systems with time-delay output.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1995년도 Proceedings of the Korea Automation Control Conference, 10th (KACC); Seoul, Korea; 23-25 Oct. 1995
• /
• pp.271-274
• /
• 1995

This paper is concerned with the problem of robust stabilization of uncertain single-input and single-output nonlinear systems. Based on the input/output linearization approach for nonlinear state feedback synthesis in conjunction with Lyapunov methods, a stabilizing state feedback controller is proposed. Compared with the controllers reported in the control literature, instead of uniform ultimate boudedness, the controller proposed in this paper can guarantee uniform asymptotic stability of nonlinear systems in the presence of uncertainties. The required information about uncertain dynamics in the system is only that the uncertainties are bounded in Euclidean norm by known functions of the system state.

• 제어로봇시스템학회논문지
• /
• 제10권10호
• /
• pp.907-914
• /
• 2004

In this paper, we present a reduced-order observer for a class of nonlinear systems based on the input output linearization. While the most results in the literature presented full-order nonlinear observer, we proposed a procedure for the design of reduced-order observer far nonlinear systems that are not necessarily observable. Assuming that there exists a global observer fer internal dynamics and that certain functions are globally Lipschitz, we can design a global reduced-order observer An illustrative example is included that demonstrate the design procedure of the proposed reduced-order observer.

• Smart Structures and Systems
• /
• 제29권5호
• /
• pp.693-703
• /
• 2022

This study investigates an effective approach to stabilize nonlinear systems. To ensure the asymptotic nonlinear stability in nonlinear discrete-time systems, the present study presents controller for an EBA (Evolved Bat Algorithm) NN (fuzzy neural network) in the algorithm. In fuzzy evolved NN modeling, the auxiliary circuit with high frequency LDI (linear differential inclusions) and NN model representation is developed for the nonlinear arbitrary dynamics. An example is utilized to demonstrate the system more robust compared with traditional control systems.

• 충청수학회지
• /
• 제26권3호
• /
• pp.605-613
• /
• 2013

In this paper, we investigate bounds for solutions of perturbed nonlinear differential systems.

• 충청수학회지
• /
• 제23권2호
• /
• pp.383-389
• /
• 2010

In this paper, we investigate h-stability of the nonlinear differential systems using the notion of $t_{\infty}$-similarity.

• 충청수학회지
• /
• 제23권4호
• /
• pp.827-834
• /
• 2010

In this paper, we investigate h-stability of the nonlinear perturbed differential systems.

• Structural Engineering and Mechanics
• /
• 제54권2호
• /
• pp.291-304
• /
• 2015

Compared with the identification of linear structures, it is more challenging to conduct identification of nonlinear structure systems, especially when the locations of structural nonlinearities are not clear in structural systems. Moreover, it is highly desirable to develop methods of parametric identification using partial measurements of structural responses for practical application. To cope with these issues, an identification method is proposed in this paper for the detection and parametric identification of structural nonlinear restoring forces using only partial measurements of structural responses. First, an equivalent linear structural system is proposed for a nonlinear structure and the locations of structural nonlinearities are detected. Then, the parameters of structural nonlinear restoring forces at the locations of identified structural nonlinearities together with the linear part structural parameters are identified by the extended Kalman filter. The proposed method simplifies the identification of nonlinear structures. Numerical examples of the identification of two nonlinear multi-story shear frames and a planar nonlinear truss with different nonlinear models and locations are used to validate the proposed method.

• 전자공학회논문지S
• /
• 제35S권11호
• /
• pp.96-105
• /
• 1998

비선형 시스템 출력 조절기의 디지털 구현시에 고려해야 할 샘플링 영향을 조사하였다. 조사결과, 선형 시스템에서와 마찬가지로 '출력 조절됨'은 보존되나, 일반적으로 '출력 조절 가능성'은 보존되지 않음이 밝혀졌다. 또한, 출력 조절 가능성이 보존되는 것을 쉽게 판별할 수 있는 비선형 시스템의 어떤 종류를 파악하였다. 이러한 결과는 일반적으로 연속시간 비선형 시스템에서 설계된 출력 조절기를 이산화하여 얻은 디지털 출력 조절기는 샘플링 시간에 대해 1차 근사에 불구함을 알려준다. 따라서, 이 결과는 일반적으로 보다 개선된 근사 샘플치 비선형 출력 조절기를 구할 필요가 있다는 것을 암시한다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2005년도 ICCAS
• /
• pp.994-998
• /
• 2005

A new control method, called a simple model matching, has been recently developed by the author. This is very simple and be applied for linear and nonlinear discrete time systems with/without time lag. Based on this formulation, identification is examined in this paper using an interconnected neural network with the EBP-EWLS learning algorithm. With this result, a control method is also presented for a nonlinear discrete time system.