Daniel Belega, Dominique Dallet, Dario Petri
In this paper the analytical expression of the contribution of the fundamental image component to the discrete spectrum of a sine-wave weighted by a cosine class window is derived. It is then analysed for some commonly used windows in the case when the considered Discrete Fourier Transform (DFT) samples fall either inside or outside the band defined by the window spectrum main lobe centred at the sine-wave fundamental frequency. From the achieved results some conclusions about the behaviour of the image component contribution to the discrete spectrum of a sine-wave are drawn. The accuracies...
TC4 Symposium 2013
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Viviane S. G. Martins, Francisco de A. F. Tejo, Raimundo C. S. Freire, Rubem A. da Silva, Arlindo G. S. B. Neto, Thais L. V. N. Silva, Marco A. Marcolin, Erich T. Fonoff
The Transcranial Magnetic Stimulation (TMS) is a non-invasive stimulation process which induces an electric field in the brain, to excite or inhibit groups of neurons. However, the current technology reaches only the motor cortex, about 1.5 cm deep, thus greatly restricting the areas of stimulation. This paper proposes a new geometry of TMS coil to reach further internal brain structures, such as the basal ganglia, with improved focality.
TC4 Symposium 2013
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Pawel Rochninski, Marian Kampik
The paper presents basic description and some simulation results of a correlation method which together with the fractional delay sampling technique can be applied to measurements of the complex amplitude ratio of sinusoidal voltages with superimposed Gaussian noise. The method allows reduction of the influence of the white noise on the result of measurement.
TC4 Symposium 2013
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Leopoldo Angrisani, Francesco Bonavolontà, Luigi Ferrigno, Marco Laracca, Annalisa Liccardo, Gianfranco Miele, Rosario Schiano Lo Moriello
Nowadays the most of the technical applications require the acquisition and the processing of signals coming from many sensors disseminated in the measurement field. Typically, to reduce the cost of the overall measurement process, the above-mentioned tasks are performed by devices as microcontroller, low cost Data Acquisition Systems (DAS), Field Gate Programmable arrays (FPGA), and so on. This is even more true when smart-sensors, or wireless sensor networks, applications are considered. These devices are characterized by some main limitations concerning with the reduced quantity of...
TC4 Symposium 2013
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Rodrigo Castro, Jesús Vega, Mariano Ruíz, Diego Sanz, Eduardo Barrera
New fast plant system controllers are being designed and developed for ITER (International Thermonuclear Experimental Reactor). They require to manage and to process massive data that is being acquired at high sampling rates. This data has to be archived for being posteriorly analysed in order to rebuild several aspects of the experiment. Our group is currently involved in different works related with ITER, and more concretely related with their fast control technologies. ITER fast plant system controllers will require data archiving, and based on ITER requirements our group developed a data...
TC4 Symposium 2013
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Domenico Luca Carnì, Domenico Grimaldi, Linus Michaeli, Jan Saliga
Multi-exponential function is used to model phenomenon or signal in several applications. The parameter extraction of each exponential is based on the assumption that no constant component is part of the signal. In the paper the superposition of exponential signals and step signals starting in different time instants is taken into consideration, and a procedure based on windowing is pointed out to estimate the parameters of each exponential function in addition to the delay of each step. Numerical tests asses the correctness of the procedure.
TC4 Symposium 2013
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Marco Balato, Daniele Gallo, Carmine Landi, Mario Luiso, Massimo Vitelli
The adoption of a Hybrid MPPT (HMPPT) technique is mandatory in PV applications operating under mismatching conditions. It is called Hybrid because it is neither only Distributed (on the PV modules) nor only Centralized (on the inverter). In this paper it is shown how to properly optimize an HMPPT technique based on the periodic scan of the Power vs. Voltage characteristic at the input of the inverter in order to locate the optimal operating value, from the energetic efficiency point of view, of the bulk inverter voltage. Therefore, numerical simulations and experimental measurements on a...
TC4 Symposium 2013
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Daniel M. Toma, Joaquin Del Rio, Antoni Mànuel, Spartacus Gomariz
This paper proposes an energy-efficient time synchronization scheme for Wireless Sensor Networks (WSNs) based on the IEEE 1588 standard. Although a number of methods have been studied for time synchronization of WSNs, some applications require high precision time synchronization with very low power consumption. This paper presents a reduced implementation of IEEE 1588 precision time protocol (PTP) for WSNs. Within the proposed synchronization approach, a sensor node is synchronized using the timing message generated by a master node synchronized with GPS. This paper also presents experiments...
TC4 Symposium 2013
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Belkis Eristi, Özal Yildirim, Hüseyin Eristi, Yakup Demir
In this study, a real-time monitoring system has been prepared by using Field Programmable Gate Arrays (FPGA) in order to monitor three phase voltage harmonics instantly. In this monitoring system, a signal input card has been designed for the purpose of transferring three phase voltage signals of the network to the FPGA card. Harmonic values of the voltage signals belonging to each phase have been instantly calculated with the 128 floating point FFT algorithm embedded in the FPGA card. The obtained harmonic values are transferred onto computer with the RS232 communication protocol created...
TC4 Symposium 2013
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Antonino Oscar Di Tommaso, F. Filippetti, Y. Gritli, Rosario Miceli, Ciro Spataro
The purpose of this paper is to present a diagnosis technique, for rotor broken bar in double cage induction motor, based on a combined use of frequency sliding and wavelet transform analysis, to isolate the contribution of the rotor fault components issued from vibration signals in a single frequency band. The validity of the proposed diagnosis approach is not limited to the analysis under steady-state operating conditions, but also for time-varying conditions where rotor fault components are spread in a wide frequency range.
TC4 Symposium 2013
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