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.
In this work we design an unidirectional invisibility cloak for a diffusive-light medium based on transformation optics, which provides a broadband, passive and polarization-independent performance and can conceal macroscopic objects. Unlike the other cloaking designs based on scattering cancellation or transformation optics, our design can work under transient illumination, which is crucial in many...
This paper presents a new control strategy for a four-leg indirect matrix converter that effectively mitigates common-mode voltages and gives optimal control of source and load currents. This method uses the commutation state of the converter in the subsequent sampling time according to an optimization algorithm given by a simple cost function and a discrete system model. The control goals are the...
This paper proposes a predictive torque and flux control for a multi-motor drive system. The scheme is based on a six-leg indirect matrix converter used to drive two induction machines operating at the same speed even under different load torque conditions. By using the mathematical model of the converter (input filter and switches) and machines, the proposed control scheme selects the switching state...
A novel approach for profile reconstruction using a Sources Reconstruction Method is presented. The idea is the calculation of the fields radiated by the reconstructed equivalent currents inside the currents domain. Profile reconstruction accuracy is improved by combining multiple incidences and frequencies. The main advantage with respect to inverse source-based techniques is the computational cost...
In this paper, an analysis of the complex voltage unbalance factor (CVUF) in three-phase lines is offered, in order to orientate future experiments in the study of the effects of voltage unbalance. The geometrical loci for constant magnitudes of the CVUF are presented, considering that the angles of the voltages are constant, and considering that the magnitudes of the voltages are constant. Furthermore,...
An obstacle detection and tracking system using a 2D laser sensor and the Kalman filter is presented. This filter is not very efficient in case of severe disturbances in the measured position of the obstacle, as for instance, when an object being tracked is behind a barrier, thus interrupting the laser beam, making it impossible to receive the sensor information about its position. This work suggests...
This paper presents the main aspects observed in analyzing Complex Voltage Unbalance Factor (CVUF) behavior resulting from the variation of voltage magnitudes and angles. The goal is to identify possible incoherencies regarding the use of the CVUF, and also to investigate whether this factor is more sensitive to variations in magnitude or angles under various voltage unbalance conditions. This study...
This paper presents the experimental results of the real time estimation of the wind speed for a wind turbine. In order to estimate the wind speed, an adaptive observer is employed. A wind turbine emulator was designed for validating the theoretical results. The wind turbine emulator is able to simulate the dynamics of a real wind turbine. For emulation purposes the wind speed is considered as a known...
In this paper the vibration attenuation problem in automotive suspension systems is presented. A robust active vibration control strategy based on sliding mode and differential flatness control techniques is proposed as a solution alternative of this problem. This active vibration control scheme only requires position measurements of the wheel and car body. State algebraic on-line estimation is used...
This paper presents the design and application of an adaptative control method for a bilateral system of teleoperation. The scheme and control of algorithm have been formulated in the state space following a control technique of the master and the slave state convergence. Based on the mentioned control scheme, gains on the control loop in order to obtain a stable bilateral system with the desired...
The present work deals with the simultaneous control and identification of a rotational mechanical system constituted by a tandem connection of disks and rotational springs. We consider the rotational system to be controlled as constituted by the first disk alone. This is to be modeled by a simple second order controlled dynamics affected by unknown perturbations arising from the cascade attachment...
A new approach is proposed for a coordination model with multiple levels. This paper explains how to obtain, decisions related with hierarchical decentralized units, through decision making, which results in a set of input/output processes that characterize a process industry. In this approach, the best global results are obtained using multicriterion decision aid methods instead of mathematical programming.
This paper describes a software tool for causal graph model construction. The aim of a causal model is to capture the influences between variables of a continuous process expressed as qualitative and quantitative knowledge. This model can be used for different purposes related with supervision, such as fault detection, fault isolation and action advising for fault handling. The application of this...
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.