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Supplier selection problems have been increasingly treated as multicriteria decision problems since evaluating them must take into account several objectives. In many problems, all criteria can be treated as order-winner factors. However, in some cases, the decision maker (DM) needs to consider qualifier factors as criteria. To allow the DM to include such factors, a veto function must be included...
This work presents a robust control approach for Maximum Power Point Tracking (MPPT) of a standalone solar Photo Voltaic (PV) system, in order to boost its efficiency. For testing the algorithm, it was considered an 80W stand-alone solar PV cell. In order to improve the efficiency of the charge controller, the proposed control strategy follows the maximum power point output.
This paper investigates the type-2 T-S fuzzy multiple feedback-loop guaranteed cost controller design for uncertain singular systems with transmission and state delays. Based on the type-2 T-S fuzzy theory, this work constructs a mathematical model for a class of nonlinear uncertain singular time-delay systems. Using the parallel distributed compensation concept with Lyapunov theory and linear matrix...
Unprecedented growth in media content generation, communication and consumption has taken over the vast majority of storage spaces in devices, network caches, and clouds. How to identify duplications from network caches is an important issue for fast and efficient content delivery network (CDN) communication and storage. In this work, we developed a novel hash scheme which is scalable and robust to...
A watermarking system ensures the reliability of images transmitted over public networks by asserting their authenticity. The texture property of host image is one of the most interesting characteristics that can be exploited to design image authentication systems. The importance of texture property emerged from the principles of Human Visual System (HVS), where modifying the spatial pixels of highly...
Control theory can establish properties of systems which hold with all signals within the system and hence cannot be proven by simulation. The most basic of such property is the stability of a control subsystem or the overall system. Other examples are statements on robust control performance in the face of dynamical uncertainties and disturbances in sensing and actuation. Until now these theories...
A simple but versatile approach to robust control design for linear systems with system and exogenous disturbances is proposed. The proposed approach is based on the technique of linear matrix inequalities and the concept of invariant ellipsoids. The approach is easily implemented computationally, its efficacy is demonstrated on the benchmark example of the F-16 aircraft model.
The purpose of his paper is to offer a numerical strategy in order to control the thermal processes with distributed parameters. Designing the control system for processes of this kind is usually difficult, mostly because of their non-standard dynamic model representation. Using energy balance equations for the process-a heat exchanger, the model is obtained. The proposed solution is to design a polynomial...
Active rectifier topologies are used for different purposes, especially widespread in renewable generation and distributed energy sources. The most common configuration for active rectifiers is the back-to-back converter. In this article, a back-to-back structure for connecting a variable frequency source to the utility grid is observed and a control algorithm, robust to grid impedance values, is...
This paper presents a new robust estimation of the lateral velocity and yaw rate using switched Takagi-Sugeno fuzzy interval observers. The longitudinal velocity is treated as the online measured time-varying parameter and the cornering stiffness at front and rear tires are assumed to be unknown but bounded with a priori known bounds. Based on a multiple model switching structure, this design divides...
The paper considers the problem of change detection and diagnosis (CDD) in vibration analysis, from the point of view of challenges and solutions. In this framework, Matlab Toolbox VIBROTOOL is presented, implementing functions for change detection and diagnosis in vibration engineering. Compared to other toolboxes in the same domain, Matlab VIBROTOOL Toolbox promotes blind source separation and advanced...
The rapid advancements in induction motor drives has led to the development of robust non-linear controller such as Fuzzy Logic Controller (FLC). The proportional integral or derivative controllers (PI, PID, and PD) have been in use for induction motor drives for past decades as speed and current controller's. However, these controllers are fixed to motor parameter changes which results in decrease...
With the increase of state dimension, the calculation of UKF algorithm increases rapidly, and UKF is more sensitive to model error, and it is not suitable for the system model with noise as non-Gaussian distribution. Aiming at this problem, this paper proposes a robust model predictive Unscented Kalman filter based on the study of robust estimation, model predictive filtering and UKF. The algorithm...
With an increase in acceptance of face recognition systems, the desire for accurate biometric authentication — face recognition, has increased. Nowadays, the fundamental limitations of existing systems are, the vulnerabilities of false verification via a picture or simple video of a person. In this paper, it is inspired by how humans can perform reliable spoofing detection only based on the available...
Uncertainties including matched and unmatched disturbances are the obstacles of developing advanced controllers for electro-hydraulic servo systems. This article presents a dual extended state observer (ESO) with full state to estimate the matched and unmatched disturbances and a robust controller to compensate them. Firstly, the nonlinear mathematical model of the considered single-rod hydraulic...
Periodic speed errors can occur in permanent magnet linear synchronous machines for two reasons: 1) a periodic reference signal; 2) cogging force and friction. For reducing such periodic errors, iterative learning control or repetitive control approaches, used in conjunction with more common control actions, can be strongly effective. However, the design of the stability filter, robustness filter...
This paper focuses to improve wind turbine systems efficiency, in other words, to maximize the output power delivered by the wind turbine. To do this it is necessary to have a good controller. In this study, we use a nonlinear synergetic controller. Synergetic control theory is applied to reach the maximum power point tracking (MPPT) of a variable speed energy conversion system. A comparison with...
The paper present an architecture multi-controller based in conventional PID controller and robust Fractional PID controller (FOPID) using PSO algorithm to optimize the parameters of PID and FOPID, and improved the robustness. This approach applied to control robotics wrist (Robot RX-90 Staübli). A brief overview of the process with a non-linear and linear mathematical modeling of the process. Principle...
This work presents a path following controller for single Unmanned Surface Vessels (USV) in formation control. Firstly, the USV mathematical model under unknown dynamic sea conditions will be analyzed. And then an adaptive robust controller is designed based on RBF neural network. Finally, the controller stability and robustness with unmodeled dynamics and unknown model parameters perturbation in...
For three-phase voltage-sourced PWM rectifier, a novel double closed loop control method was proposed in this paper, based on the mathematical model in synchronous rotating coordinate system. Considering the coupling characteristics, the current inner loop developed a practical hybrid control method, consisting of inverted decoupling and internal model control (IMC), which could realize the complete...
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