The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper deals with parameter identification of Hammerstein model having a unified model of several discontinuous nonlinearities containing hysteresis, saturation, preload and dead-zone. This model contains different parameters the choice of which may generate nine different nonlinearities. Contrary to the nonlinearity block structure which is unknown, the structure of linear block is assumed to...
This paper presents a recursive least-squares approach to estimate simultaneously the state and the unknown input of linear time varying discrete time systems with unknown input. The method is based on the assumption that no prior knowledge about the dynamical evolution of the input is available. The joint input and state estimation are obtained by recursive least-squares formulation by applying the...
This paper investigates the impact of High Voltage Direct Current (HVDC) transmission on the transient stability of a two-machine power system, considering three transmission line configurations: parallel HVAC-HVAC, parallel HVDC-HVDC, and a hybrid HVAC-HVDC operation. The faults are balanced three-phase short-circuits in AC lines, and single phase faults on DC lines, applied in the mid-point of the...
Network on Chip is an efficient on-chip communication architecture for SoC architectures. It enables the integration of a large number of computational and storage blocks on a single chip. The router is the basic element of NoC with multiple, connecting to other router and to a local IP core. This router architecture can be used later for building a NoC with standard or arbitrary topology with low...
This paper proposes a new method to design a fuzzy logic controller by genetic algorithms (GAs). The basic idea of this new methodology is to use a new way to mutate the chromosome. Bio-process control problem is used to compare the proposed mutation to traditional mutation. The results show that the proposed mutation efficiently improves GA's performance.
In this work, we are interested in the experimentation of an autonomous wind energy conversion system (WECS) using a test bench emulating a variable speed wind turbine (VSWT). This wind generator is connected to isolated loads through a DC bus and an inverter. The regulation of the DC bus voltage is carried out by a DC load controlled by a chopper. The goal of our work is to show the load voltage...
With the fast evolution of the networks technology, the security becomes an important research axis. Many types of communication require the transmission of digital images. This transmission must be safe especially in applications that require a fairly high level of security such as military applications, spying, radars, and biometrics applications. Mechanisms for authentication, confidentiality,...
In this paper, stability and stabilization issues of positive and periodic discrete systems with bounds on the control and on the state variable is addressed and a solution is provided. The proposed conditions are formulated as equality and inequality constraints enabling all the considered problems to be expressed, with the addition of appropriate cost function, in a linear programming framework...
This paper introduces new dilated sufficient LMI conditions for the single channeled multiobjective static state feedback controller synthesis in linear continuous-time systems for which, optimality is defined in terms of H2 and H∞ performance criteria jointly applied to a single channel. These conditions provide sub-optimal synthesis procedures that have the advantage of keeping the controller parameters...
Unsharp masking is a popular and simple technique for contrast enhancement and sharpening in digital images. The basic idea in this technique is to emphasize edges and discontinuities in the image by adding the edge information back to the original image. In order to achieve higher contrast level in the processed image, the edge information can be scaled prior addition to the original image. However,...
This paper proposes an application of a variable structure observer for wheel effective radius and velocity of automotive vehicles. This observer is based on high order sliding approach allowing robustness and finite time convergence. Its originality consists in assuming a nonlinear relation between the slip ratio and the friction coefficient and providing an estimation of both variables, wheel radius...
The rapid growth of networks and services has introduces new complex environments. To cope with this complexity, IBM proposed autonomic computing. It allows systems to mange themselves instead of relying on IT professionals. On the other hand, overlay networks are getting a great attention due to the reliable and effective services that they provide. With the increased number of mobile users and services,...
This paper shows the interest of extending the dynamic parity space fault detection method for fractional systems. Accordingly, a comparison between fractional and rational residual generators using the later method is presented. An analysis of fractional and rational residuals' sensitivity shows the merits of the fractional residual generators. A numerical example illustrating the advantage of using...
The aim of this work is to study sliding mode observer applied to mono-inverter bi-motors system for railway traction application. Studied system composed of two induction motors (IM) fed by one voltage source inverter (VSI) which controlled by Mean Rotor Field Oriented Control (MRFOC). Both IM are coupled through common loads which complicate this study and introduce perturbations of all system;...
Integration of wind energy needs a high accuracy prediction of the wind power production. The presence of missing and erroneous values in a dataset can affect the performances of the prediction tools based on the training process. In the case of the wind farm, the historic data is necessary to keep a dataset containing recorded variables such as wind speed, wind direction, temperature, power, etc...
The goal of this paper is to optimize the performances of holonomic systems in particular “pick and place” systems: time execution, precision and energy. The command generation is divided into two main functions: The elaboration of a movement law for the system states to control minimizing the time execution via the bang-bang control, which is used as a reference for controls (indirect control using...
The emerging technology during the last years allowed the development of new sensors equipped with wireless communication which can be organized into a cooperative autonomous network. Some application areas for wireless sensor networks (WSNs) are home automations, health care services, military domain, and environment monitoring. The required constraints are limited capacity of processing, limited...
The fractional integrator is certainly the key operator of fractional calculus, because of its fundamental applications in Fractional Differential Equation simulation and for the definition of fractional initial conditions. Fractional integration is defined by the classical Riemman-Liouville integral, derived from repeated integration. Three approaches commonly used to define the fractional integration...
This brief paper deals with the synthesis of H∞ reduced order stable controllers for linear systems. It is well known that, the problem of obtaining an H∞ reduced order controller can be formulated as a bilinear matrix inequality optimization problem which is non convex and NP hard to solve. In this paper sufficient conditions are provided which allow to convert the H∞ reduced order stable controllers...
This paper presents an estimation of the per-unit-length parameters of a lossy cable. A RLGC lumped element model for the lossy transmission line parameters of a coaxial cable including frequency dependent filtering effect is used in this study to evaluate reflectometry responses of the cable systems. The simulated results of this model are compared with the measured results of a coaxial cable using...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.