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Using the database of a pen-tip moving on (x, y) plane during the human handwriting motion, this paper presents a novel algorithm to generate handwritten graphic traces, which is inspired from the idea of tracing circles by Bresenham multi-axis control algorithm. The effectiveness of this approach should be observed on predicting different cursive Arabic letters and geometric shapes constituting the...
The aim of this paper is the study and the design of a monitoring module based on P-time Petri nets (P-TPN) for manufacturing job-shops with time constraints. In such systems, operation times are included between a minimum and a maximum value. The monitoring consists in a set of two collaborative PNs. The first is used for modeling of normal behavior of the system by temporal spectrum of the marking...
In this paper, a comparison between two new approaches of flatness-based switching control of dynamical systems with variation of operating modes is proposed. For each model, a corresponding flatness-based controller is designed and consequently, a multi-controller structure is obtained. The localization of the process current model is carried out using two distinct methods, the first to find the...
In this paper a new practical stability conditions for delayed Lur'e Postnikov system are proposed. The study use a specific form state space description, named, Benrejeb characteristic arrow matrix. An illustrative example is presented to show the efficiency of proposed method.
An optimal design approach is developed for permanent magnet motors. First, parameterized design model is built. Second the significant shape parameters are identified using the Fisher test of ANOVA. Finally, an optimal design loop, delivering as final output optimized geometries of Permanent Magnet motors, is implemented.
In this paper, a flatness-based control strategy for linear time-varying systems is proposed in order to track a desired trajectory. The flatness-based control is designed by using two observers: a reduced order observer with a constant estimator error gain and an exact observer for designing a polynomial two-degrees-of-freedom controller without resolving Bezout equation in time varying framework...
This paper presents performance comparison of three inverter control techniques. These techniques are respectively hysteresis control, PWM control and direct voltage control (DVC). They are applied for a PM Linear Tubular Synchronous Actuator (PMTLSA) drive fed, using a three phase voltage source inverter (VSI). This VSI is working with constant switching time intervals as in the standard torque control...
The performance of an enterprise largely depends on the schedule of its resources. A good schedule may increase the output rate and reduce the production costs. Therefore, in this paper, we consider the cyclic schedule of hoist activities in automated electroplating lines which is commonly known as Cyclic Hoist Scheduling Problem (CHSP). The CHSPs appear in the manufacturing facilities to achieve...
In this work, delay-dependent stability conditions for systems described by delayed differential equations are presented. The employment of a special transformation to another state space representation named Benrejeb characteristic arrow matrix permit to determine a practical asymptotic stability condition. An Illustrative example is presented permitting to understand the application of the proposed...
Developments presented in this paper are devoted to the robustness of manufacturing job-shops with time constraints and assembling tasks. A computing algorithm, of an exact bound of the maximal time disturbances allowed in a given point, is provided. To demonstrate the effectiveness and accuracy of this new algorithm, an industrial example is depicted. The example shows how the proposed algorithm...
In this paper, new stability conditions for time delay system are proposed. They are based on the use of the aggregation techniques and the choice of a state representation as Benrejeb arrow form characteristic matrix. Application cases are treated to illustrate the implementation of the proposed approach.
In this paper, the problem of delay dependent robust exponential stability for neutral system with time varying delays and structured uncertainties is investigated. By introducing a novel augmented Lyapunov functional, a new delay dependent sufficient stability criterion is obtained in terms of Linear Matrix Inequalities LMIs. The proposed approach involves neither free weighting matrices, nor any...
This paper deals with a new approach for complex systems modeling and control based on neural and fuzzy clustering algorithms. It aims to derive a base of local models describing the system in the whole operating domain. The implementation of this approach requires three main steps: 1) determination of the structure of the model-base, the number of models are found out by using Rival Penalized Competitive...
In this paper, a new structured mixed-sensitivity ℋ∞ design approach, using Particle Swarm Optimization (PSO) technique, is proposed. The case study of an electrical DC drive benchmark is adopted to illustrate the efficiency and viability of the proposed control approach. The optimization based synthesis problem is formulated and solved by a constrained PSO algorithm. In the proposed control strategy,...
This paper concerns the domain of Hoist Scheduling Problem (HSP) and focuses on the cyclic schedule problems. In this study we tackle the single hoist cyclic scheduling problem for heterogeneous pat jobs. We propose an approached method to find an optimum or near optimum feasible cyclic scheduling which respects the hard resource and time-window constraints. We describe a genetic algorithm approach...
This paper deals with the problem of fault estimation for linear and nonlinear systems. An adaptive proportional integral observer is designed to estimate both the system state and sensor and actuator faults which can affect the system. The model of the system is first augmented in such a manner that the original sensor faults appear as actuator faults in this new model. The faults are then considered...
In high-performance servo applications, a rapid and accurate torque control is required, preferable without the use of the motion-state sensor. The use of permanent magnet synchronous motors combined with direct torque control techniques provides many opportunities to achieve this goal. The purpose of this paper is to improve the modeling and the control of a typical tubular permanent-magnet linear...
In this paper a sensor fault detection and isolation procedure based on principal component analysis (PCA) is proposed to monitor a three interconnected tanks system. The PCA model is built to maximize fault detection sensitivity using a new index. The localization procedure is carried out using two methods. The first is based on the variables contribution to the fault index. The second is based on...
This paper deals with the problem of fault detection and identification in noisy systems. A proportional integral observer with unknown inputs is used to reconstruct state and sensors faults. A mathematical transformation is made to conceive an augmented system, in which the initial sensor fault appear as an unknown input. The noise effect on the state and fault estimation errors is also minimized...
This paper deals with a problem of exponential delay dependent stability and stabilization of linear systems with time varying delays. Using the Lyapunov parameter dependent functional, new sufficient conditions for exponential stability criterion has been derived in terms of linear matrix inequalities (LMIs) which can be easily solved using efficient convex optimization algorithms. Hence, the allowable...
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