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This paper focuses on the global behaviors of a class of pendulum-like dynamical networks with multiple equilibria. Sufficient conditions for the determination of gradient-like as well as dichotomy behavior are given in terms of linear matrix inequalities (LMIs). In order to examine the global synchronous behavior, a concept of generalized synchronization is introduced, and the criterion for generalized...
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...
Hinfin filter design for systems with time-varying interval delay is investigated in this paper. Improved delay dependent Hinfin performance condition is presented by using the free-weighting matrix approach and considering the relationship among the time-varying delay, its upper bound and their difference. As a result, a modified cone complementary linearisation (CCL) algorithm with a new stopping...
Research effort that has been spent on the minimax design of two-dimensional (2-D) FIR filters mainly focuses on linear-phase filters. Recent methods for the minimax design of 2-D FIR filter with reduced group delay minimize the maximum magnitude of the complex error between the desired and actual frequency responses. The maximum magnitude response and phase response errors are uniquely determined...
Based on a closed-loop step response test, a model identification method is proposed for integrating processes with time delay in this paper. By introducing a damping factor to the closed-loop step response for realization of the Laplace transform, a frequency response estimation algorithm is developed in terms of the closed-loop control structure used for identification. Correspondingly, two model...
In this paper, we deal with the problem of delay-range-dependent robust Hinfin filtering for uncertain linear systems with time-varying delays in a range, which are subject to norm-bounded parameter uncertainties. Both the state dynamics and measurement of the system are with time-varying delays belonging to a given range. The aim of this problem is to design a full-order linear filter, such that...
This paper concerns a problem of on-line model parameter estimations for multiple time-delay systems. In order to estimate unknown model parameters from measured state variables, we propose two schemes using the Lyapunov's direct method, called parallel and series-parallel model estimators, respectively. It is shown through a numerical example that the proposed parallel and series-parallel model estimators...
This paper presents an output feedback sliding mode control algorithm for linear MIMO systems with mismatched parameter uncertainties along with disturbances and matched nonlinear perturbations. A scheme of the output-dependent integral sliding surface is proposed and a control law is then designed to satisfy the reaching and sliding condition. Through utilizing Hinfin control analytical technique,...
This paper deals with the problem of Hinfin norm computation for general symmetric systems and descriptor symmetric systems. The computation of Hinfin norm for state-space symmetric systems is extended to descriptor symmetric systems. An explicit expression is given based on the bound real lemma (BRL), and the generalized bound real lemma (GBRL). The results have obvious computational advantages,...
In this paper, we present a polynomial solution to a particular Hfrinfin control problem, which arises in the robust stabilization of a SISO plant when the uncertainty is described by the gap metric, nu-gap metric, pointwise gap metric, or normalized corprime factor perturbation. Compared with the existing state space solution, the polynomial solution appears simpler and more elementary. It boils...
This work expands fundamental disciplines in classical control on 2D version to such an extent that the well-established 1D-Hinfin robust control can be directly extended to spatiotemporal L2-gain robust control for Sturm-Liouville class. The kernel is to extend Laplace transform and Fourier transform for Galerkin-Laplace transform and Galerkin- Fourier transform, respectively, which transform the...
We study the Hinfin Controller reduction problem for structured uncertain systems whose uncertainties are governed by Integral Quadratic Constraints. A sufficient condition for obtaining a reduced-order controller is given in terms of a system of rank constrained Linear Matrix Inequalities which can be solved using existing algorithms. In this approach, the balancing state transformation is a decision...
This paper describes a robust chiller sequencing control strategy developed for central chilling plants with multiple chillers. In the robust strategy, a data fusion scheme is used to improve the reliability of building cooling load measurement. A chiller maximum cooling capacity online calculation scheme is used to improve the reliability of chiller sequencing control together with the data fusion...
This paper proposes a backup attitude estimation scheme for small fixed-wing unmanned aerial vehicles (UAVs) in the event of gyroscopic failure. The attitude of the system is propagated in terms of 3 degrees-of-freedom (DoF) aircraft dynamics while a combined accelerometer and global positioning system (GPS) based attitude measurement scheme is used to update attitude errors. The uncertainties in...
The real structured singular value μ is effective for robust stability analysis of systems with structured uncertainty. Several methods for obtaining upper bounds of μ have been proposed. However, it is difficult to obtain the true value of μ. In this paper we propose a calculation method for real structured singular value μ by Stability Feeler, which is a new robust stability analysis tool proposed...
In this paper we develop a general discrete-time adaptive control approach suitable for nonlinear systems with periodic parametric uncertainties. The underlying idea of the new approach is to convert the periodic parameters into an augmented constant parametric vector by a lifting technique. As such, the well-established discrete-time adaptive control schemes can be easily applied to various control...
It is well known that friction in haptic devices plays a key role in dissipating surplus energy and maintaining passivity of the haptic system. It is also shown in the previous study [14] that the surplus energy can be also dissipated by careful exploitation of human operator's damping. This paper defines a Passivity Margin and extends the original passivity condition [14] that includes the human...
The primary focus of this work is to design and implement a robust automatic flight control system for a smallscale unmanned helicopter. A comprehensive nonlinear model for the unmanned system, which is constructed by our research team at the National University of Singapore, is first derived and presented. Based on its linearized model, a robust automatic flight control system is then designed by...
Motion control systems have found their application in various industry products. Common issues encountered when designing this type of systems are nonlinearities and uncertainties (e.g., unknown parameters, unmodeled dynamics, and disturbances). In this paper, we study controller design for a class of motion systems with rotary components. The systems are assumed to have unknown parameters which...
In most batch processes, quality control measurements cannot be completed before the next batch operation. Thus, the corrective step is often delayed by one batch or more. The uncertain duration of delay with stochastic characteristics can be treated as a random variable of unknown distribution. Coupled with inaccurate process models, the delay may lead to significant process output variations even...
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