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In this paper, we investigate the parameterization of all robust stabilizing multi-period repetitive controllers for multiple-input/multiple-output time-delay plants. The multi-period repetitive control system is a type of servomechanism for a periodic reference input. When multi-period repetitive control design methods are applied to real systems, the influence of uncertainties in the plant must...
This paper focuses on an integral sliding mode control (ISMC) algorithm for the fault-tolerant control of linear continuous multi-input systems with non-smooth nonsymmetric actuator dead-zone failure and unmatched disturbances. The dead-zone is first modeled as a combination of a line and a disturbance-like term. And the novelty of the paper lies in that the treatment of the deadzone failure based...
In this academic brief, robust stochastic stability and stabilization for a category of uncertain stochastic systems with multiple time-delays as importantly issues are investigated. Via constructed multiple-interval-dependent Lyapunov-Krasovskii functional, more information between the delays have been considered, some novel criteria for the solvability of above issues are derived defined as LMIs...
In this paper, the problem of model predictive control for drum water level of boiler systems is investigated. The parameter uncertainties are time-varying norm-bounded and the non-linearity is assumed to satisfy the boundedness condition. The aim is to design a state-feedback controller which minimizes an upper bound on a quadratic objective function at each sampling instant. The hard constraint...
For a class of linear discrete-time systems, a feedback feed-forward iterative learning control (ILC) scheme is proposed, which can guarantee the system is monotonically convergent along the iteration direction and is Bounded-Input Bounded-Output (BIBO) stable along the time direction. First, the feedback feed-forward iterative learning system is presented by a two-dimensional (2-D) Roesser model...
This paper presents a nonlinear robust fault tolerant control scheme to force the faulty system to asymptotically track a given desired trajectory via cascade observers. Focusing on the external disturbance and actuator faults of the nonlinear non-minimum phase vertical take-off and landing aircraft, two decoupled reduced order observers are designed to estimate the unknown disturbance and fault....
Harmony search algorithm is a good intelligent optimization algorithm, but it is not high robustness and large random. So combining variable metric method of the better local search ability, Harmony Search Algorithm based on variable metric method is proposed. Giving the theory of the basic harmony search algorithm and variable metric method, the specific processes of the improved algorithm is analyzed,...
Since feature extraction not only plays a key role, but also have a great effect on image analysis and registration. In this paper, we evaluate a comparative performance of three point feature extraction algorithm such as SIFT, SURF and BRISK. The experimental results show that SURF exhibited a better significant results on extracting point features and matching time, compared to SIFT and BRISK. The...
The topological design of a network is a key challenge in order to supply a large set of requirements from telecommunication services required by customers, which include bandwidth capacity, fault tolerance, low levels of delay, security, among others. The fulfilment of such requirements will directly impact on quality of service and customer satisfaction. In order to deal with this problem, one can...
Tracking-by-detection based on online learning has shown superior performance in visual tracking of previously unknown objects. However, most approaches are limited to a fixed-size box representing objects unless applying affine transformation method. They can neither show the object's visible area without shelter nor handle the object complete occlusion and disappearance situation. To overcome the...
The finite-time stabilization problem for a class of neutral time-delay systems is considered. For the energy-bounded disturbance input, the designed state feedback controller can makes the concerned neutral systems finite-time stabilization. By using the constructed Lyapunov functional and linear matrix inequalities techniques, the sufficient condition for the finite-time stabilization is derived...
Non-fragile robust control problem of a fan system is studied. It is pointed out that this problem of the fan system is really a non-fragile robust performance problem, the problem of the fan control system with both non-fragile robust stability and performance requirements(bandwidth and other performances). It is also suggested that the design of the non-fragile robust performance of the fan system...
In this article, we provide a numerical method for the mixed H2/H∞ synthesis minimizing the H2 norm of one transfer function while imposing restriction on H∞ norm of the other transfer function. The mixed H2/H∞ robust controller with degree constraint can be designed by solving the nonlinear equations, where a group-preserving scheme is introduced. Three examples are used to investigate the numerical...
The problem of network congestion control is studied for a class of TCP network systems with state delay and external disturbance. Because the state of the system is not fully measurable, the state observer is designed. The sufficient conditions for the robust stability of the error system is given based on linear matrix inequality (LMI) and Lyapunov stability theory. According to the reaching condition...
For the system with both polytopic uncertainty and bounded disturbance, an off-line approach to the dynamic output feedback robust model predictive control is considered. To reduce the on-line computational burden, a look-up table is constructed off-line for on-line searching the real-time control parameters. During the on-line searching stage, if an off-line calculated ellipsoidal region of attraction...
In this paper, a simple robust saturation controller is developed for attitude maneuver of a rigid spacecraft, in which external disturbances and control input constraint are simultaneously taken into account. Precisely, a class of novel nonlinear saturation functions, called power saturation function, is investigated to rigorously enforce actuator-magnitude saturation constraints. Although control...
Feature descriptors usually have high dimensionality to efficiently represent key points. Finding matches between large sets of descriptors is a basic step in many applications in computer vision and image processing. When the number of descriptors is large, detection of corresponding points can be extremely time-consuming. The goal of this paper is reducing the computational cost in the matching...
In this paper, a new method is proposed to provide a reliable and accurate algorithm to search and precisely find the center of a reference image in a set of video frames. By implementing algorithms such as SIFT and PCA-SIFT, some matched points are obtained. Some of these points are accurate, some of them are not strictly accurate and others are incorrect. As a result, registration process may be...
In this paper, we investigated an adaptive observer for fault detection and reconstruction. The proposed method is developed for linear systems with disturbance input and partial state availability. The method could be used for disturbance reconstruction, as well. The Lyapunov analysis is utilized to show the convergence of error signals. Design parameters are obtained by solving a feasible algorithm...
An algorithm to insert augmented reality in sports scenes is presented. The goal is to augment an image to the scene so that it appears as a part of the original scene. The proposed algorithm uses the homography relationship between the image coordinates and the world coordinates, then utilizes the Sift algorithm to find the corresponding points between two frames. By using the homography map we can...
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