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For stability analysis of discrete-time arbitrary switching positive linear systems, we introduce a new class of switched copositive Lyapunov functions (abbreviated as CLFs) and we investigate their test power. The new class means “switched max-type CLFs” and it is defined by generalizing the “mode-independent max-type CLFs” (that were introduced and characterized by our previous works). This generalization...
The model-based control of building heating systems for energy saving encounters severe physical, mathematical and calibration difficulties in the numerous attempts that has been published until now. This topic is addressed here via a new model-free control setting, where the need of any mathematical description disappears. Several convincing computer simulations are presented. Comparisons with classic...
In this paper we focus on the supervisory control problem of a parallel hybrid electric vehicle (HEV): minimize fuel consumption while ensuring self-sustaining State-of-Charge (SoC). We reapply the state of the art methodology by comparing optimal results of Dynamic Programming (DP) against a real-time control candidate. After careful selection, we opted for an Equivalent Consumption Minimization...
The paper proposes a technical procedure for modeling the parameters variation of a fluid flowing through a transport structure. The determined models are used to identify more accurately the leakage points / faults occurring in this infrastructure. The procedure considers faults / leaks that are variable, with minimum and maximum limits being defined. The validation of the procedure is done by implementation...
This article presents a real-time control system for an experimental model of a water distribution system. The hardware and software implementation follows the latest trends in IoT and proves that such an architecture can be used for real-time process control in distributed systems. The control of flow is implemented using a multiple-model control algorithm for the pumping station. A method which...
Proposed here is a Fault Tolerant Control (FTC) design for nonlinear power systems with unknown actuator failures. The method is based on the efficient multi input-multi-output linearization technique. The power system considered here is consisted of two generators along with a load and an infinite bus via a transmission network. First, the derivatives of the system's output is calculated repeatedly,...
The paper is dedicated to the systemic botany domain and analyzes the degree of affinity between the species, genera and families based on fractal theory. The research is conducted on the image information from Gentianaceae family plant, in order to determine their membership to the recognized genera Gentiana, Gentianella and Gentianopsis which were previously tagged into a single genus. Some concepts...
This paper presents a research on using Google's Word2Vec model for intertextuality detection in literary texts. Word2Vec is considered a new and powerful Natural Language Processing semantic tool, used for computing text cohesion and similarity between documents. This article analyzes intertextuality in terms of semantic relations between words in novels. A similarity is calculated as a score: the...
It has been found that almost all routing protocols can induce network congestion due to control message complexity. To overcome this overhead various optimization processes are used. One such process is gossiping, where each node forwards a message with some probability, to reduce the overhead of the routing protocols. In this paper, we show how gossiping can be used to improve the performance of...
The primary objective of this paper is to make a comparative study of different data association methods for multiple target tracking (MTT) problem, analyze the problems encountered in almost all target tracking applications and propose a new method, considering the comparison results of performed algorithms. As the first solution to the MTT problem, the Global Nearest Neighborhood (GNN) approach...
Automation systems, as well as process control, has played a key role in the industry nowadays. For good system performance, it is necessary that mathematical model is closest to the real model, which is detailed in this work. The objective of this study is to present a modeling (considering the viscous friction), stability analysis and simple PID controller tuning using as an example, an arm with...
For complying with power distributor regulation, the electric car chargers have to address the line current harmonic mitigation problem. The conventional solution is a proportional integral controller on the rectified current with a feed-forward anticipation action on the input network current. In this work we take advantage of a harmonic description of the electric car charger in order to propose...
In this paper, a guidance law for tracking straight-line segment and a constant-altitude circular orbits are proposed for a fixed wing unmanned aerial vehicle (UAV). Both guidance laws are based on the notion of vector fields, which are used to generate desired commands to the inner-loop attitude controller. Ground track heading error and lateral following error approach zero asymptotically even in...
Our article deals with the development of a robotic arm with “open control system” (for this particular application — with two degrees of freedom and possibility to add). The open control system allows, together with the known parameters of our robotic arm, to use advanced control methods. The robotic arm is controlled by a PLC and automatically generated code via tools — BR Target for Simulink. This...
In this paper a model-based fault detection method of actuators in a biological wastewater treatment process is proposed. Using an extended Kalman filter, the states of a WWTP model are estimated. Then, comparing the estimated states affected by actuator faults with the model of the process, the residuals are generated. Simulation results show that faults can be detected effectively using this method.
In this paper there are considered some applications arising from power engineering and involving hyperbolic equations of conservation laws. Focusing on the control of the flow in open channels, there is considered the linearized model and a Lyapunov functional is associated. A linear multivariable controller with saturation is synthesized to make the Lyapunov functional exponentially decreasing along...
The ℓp norm-constrained proportionate normalized least-mean-square (LP-PNLMS) using the modified filtered-x structure is proposed for active noise control. It is shown that better performance is obtained for primary and secondary paths having a wide range of sparseness levels when compared with competing sparsity-inducing algorithms at a price of moderate complexity increase.
This paper proposes a multiple predictive control strategy in order to control a combination of substrate concentrations inside of an anaerobic digestion process of microalgae. Based on the linear approximation of the original nonlinear model, an optimal control algorithm was developed and tested by simulation experiments. The obtained results validate the effectiveness and robustness of the proposed...
Five stabilizing controls for discrete-time quasilinear control systems based on the solution of the Discrete-Time State Dependent Riccati Equation (D-SDRE) are examined. One of the approaches has been proposed by the authors and uses the approximate solution of the D-SDRE. The main goal of this paper is to obtain the results on comparative computational characteristics of the discussed control synthesis...
The necessity of performing multispectral and hyperspectral image compression on multicore processor devices running on-board satellites has increased as spectral remote sensing devices produce a high amount of data. Multispectral and hyperspectral instruments acquire images that need compressing before being sent to Earth, because the bandwidth used for transmitting images is a limited resource....
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