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The design of a robust two-degree-of-freedom (2-DOF) controller for a flight motion simulator is presented. Considering the load variation, torque disturbance, high-frequency mechanical resonance, input saturation and tracking precision, the controller is designed including a feedback controller and a feedforward controller to satisfy robust stability and robust performance simultaneously. The computation...
In this paper, the problem of delay-dependent Hinfin filtering for a class of nonlinear singular systems with network-induced delays is considered. The aim is to design a filter such that the filtering error singular system is regular, impulse-free, stable and satisfies a prescribed Hinfin performance level. According to the linear matrix inequality (LMI) approach, a sufficient condition that guarantee...
The celebrated small-gain approach to robust control only makes use of the gain information of uncertainty. This results in a limitation on the achievable control bandwidth in system design. On the other hand, the alternative passivity approach has only limited applications. To relax the limitations associated with small-gain and passivity approaches, we explore the possibility of utilizing both the...
Neo-robust control is a new theory proposed by the authors, which utilizes both the gain and the phase information of uncertainty in robust control design. In this paper, we focus on the analysis of robust performance. Specifically, we analyze the robust sensitivity and the robust bandwidth in detail. Further, disclosed is the difference in the achievable robust performance between systems with in-phase...
The paper is concerned with the robust stability for a nonlinear feedback system with perturbations using robust right coprime factorization method combining with isomorphism approach. The factorization of an unstable plant is realized using the isomorphism approach, and the Bezout identity can be satisfied with the obtained factors and designed operators. As a result, the whole system is overall...
In this paper, operator based internal model control (IMC) of perturbed nonlinear systems is considered. That is, by combining IMC theory and robust right coprime factorization approach, sufficient condition for the designed feedback control systems with perturbation is obtained. Based on the obtained condition, robust stability of the nonlinear systems is obtained. A simulation example is also given...
This paper discusses robust stability and stabilization of uncertain discrete-time fuzzy systems that have time-varying delay in state. There have been only a few results on stability and stabilization for discrete-time fuzzy time-delay systems. Especially, few results on robust stability and stabilization for a class of uncertain discrete-time fuzzy time-delay systems have appeared in the literature...
In this paper, dropped the assumption of the boundedness of the activation functions, the global dynamics are investigated for the recurrently connected neural networks (RCNNs) with discontinuous activations and time-varying delays. Based on the nonsmooth analysis theory, linear matrix inequality (LMI) technique and differential inclusions approach, several sufficient conditions are obtained to ensure...
This paper investigates how to use robust model prediction control in air-conditioning systems. Air-conditioning processes are described using a first-order plus time-delay model associated with uncertainties in process gain, time constant and time-delay. An uncertainty polytope is developed to describe the corresponding uncertainties when the continuous model is sampled into a discrete one and further...
This paper studies analytic robust stability criteria for large-scale cyclic gene-protein regulatory network systems with unstructured or parametric uncertainties. We first consider a class of gene expressions, which is described as uncertain Linear Transcription-Translation Models (LTTMs) with not only feedback loops from translation products to transcription but also degradation properties of proteins...
Given a periodic reference signal or disturbance, repetitive control is a special control scheme to reduce a tracking error effectively by the periodic signal generator in the repetitive controller. In general, a repetitive controller is added on the existing feedback control system to improve the tracking performance. However, the repetitive controller has been designed without utilizing the information...
This paper proposes a novel method to synthesize robust proportional-integral-derivative (PID) controllers using particle swarm optimization (PSO). Robust control is well known for its ability in dealing with system uncertainties and disturbances. Standard robust control design, however, can result in controllers that are high-order and complicated and can be difficult to implement in practical applications...
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