IMEKO Event Proceedings Search

Page 802 of 936 Results 8011 - 8020 of 9356

Codrin Donciu, Marinel Temneanu, Alina Samoila
New Prototype Architecture for Vision Automated Inspection

the project proposes to accomplish a new system architecture of real-time video inspection of textile materials, which should ensure a fault tracking-down, rate of over 99%, in the presence of disturbing elements from the industrial environment. The inspection procedure stipulates that the system should learn the correct model of the textile material, so that it is able to notice the deviations that might appear during its inspection. The model changes are analyzed with the help of many detection algorithms to separate real flaws from normal variations, accepted in the material. After the detection, follows the localization of the flaw, settling the coordinates, its size and recording it in the flaw library. This is a work-in-progress that has to be finished in august 2008.

Dorin Lucache, Alecsandru Simion, Leonard Livadaru
Method to determine the internal angle of a synchronous machine for establishment of the experimental torque-angle characteristic

The paper describes the experimental determination of the internal angle of a permanent- magnet synchronous electrical machine with axial air gap, using the results of the usual measurements of voltages, currents and torque in transient load operation. The particular propriety of the used test- bench is pointed out, as well the necessary improvements to reduce the method limitations.

M. Felizardo, R.C. Martins, T.A. Girard
Spatial identification of nucleations in Superheated Droplet Detectors

We present a new method for the identification of bubble nucleation in superheated droplet detectors. This is accomplished through some elaborate signal processing techniques applied to the acoustical recording of the nucleation events. These include the application of wavelets, chirp-z transform and pulse shape identification procedures to locate temporally and validate the nucleation together with back-propagation algorithms for spatial localization. Experimental results are given for the spatial localization at different temperatures and pressures.

Leopoldo Angrisani, Mauro D’Arco, Annalisa Liccardo, Rosario Schiano Lo Moriello
An innovative low-cost device for electricity metering services

The paper presents a prototype of cost-effective device mandated to identify, classify and measuring typical disturbances characterizing the quality of power supply systems. In particular, variations from the nominal root-mean-square value of the voltage signal, referred to as sag, interruption and swell, are taken into account. Moreover, specific functionalities implemented on the prototype offer the possibility of measuring the apparent and active absorbed by a connected load, as well as verifying voltage spectral purity by mean of the evaluation of a traditional total harmonic distortion index.

Annalisa Liccardo, Nicola Pasquino, Nello Polese
A comparative analysis of induction and electronic active energy meters

A comparative analysis of induction and electronic meters with regards to active energy measurements is presented, based on results obtained by application of a designed plan involving several input factors such as power voltage amplitude, power frequency, voltage total harmonic distortion (THD) and flicker severity.

Marcantonio Catelani, Lorenzo Ciani, Valeria Scarano
Analysis of a diagnostic system for railway overhead line automatic regulation

The increase number of high speed trains needs an high reliable and available railway overhead line. Because of the elevated train speed increases the wear failures, with possible railway track interruptions. Therefore it’s necessary to identify failures modes and correlated effects to improve the railway network availability and safety features as well as maintenance and renewal costs. This strictly depend on the appropriate use of diagnostic methodologies: the traditional approach of cyclic maintenance needs to be replaced by more efficient approaches, such as on-condition and predictive maintenance.

L.Nita, C. Dosoftei, C. Donciu, C.Sarmasanu
Informatic system of interactive training for virtual laboratory type applications

The project proposes accomplishing of a new informatics system architecture, under the form of a high-speed virtual laboratory, with a multitask type access on laboratory work, to remove users’ waiting lists and allow reconfiguration of electric assembling in real time. Accomplishing the project was preceded by a thoroughly analysis of didactic requests according to economic problems, so that, the following aspects would be solved: Students will access from the distance real instruments and will accomplish online test montages, in the idea of understanding all the aspects of a real experiment (including possible flaws). Errors detected in prescribing the commands towards the machine will not be corrected automatically, but the student will be warned. The results of the tests will be supplied by the user in the same way the real instrument does.

Antonio Cataliotti, Alfredo Daidone, Gaetano Sanacore, Giovanni Tinè
Characterization of Medium Voltage Cables for Power Line Communication

In this paper a new approach is proposed, for the detection of harmonic sources in polluted power systems. It is a single-point strategy, based on a comparison among different “nonactive” power quantities proposed in literature, that, in the same working conditions, assume different values at the metering section. Some simulations tests were carried out on a standard IEEE test system, proposed, by other authors, as a benchmark system for the analysis of multi-point measurement techniques for harmonic pollution monitoring. The obtained results show that the proposed single point approach is in agreement with other strategies already proposed in literature and can give useful indications for the detection of the dominant harmonic source in a metering section also in some critical cases.

Francesco Adamo, Filippo Attivissimo, Giuseppe Cavone, Anna M. L. Lanzolla
A Virtual Instrument for the Electric Power Monitoring in the Distributing Network

This work proposes a virtual instrument (VI) for the electric power quality monitoring aiming to act in real-time for detecting, monitoring and recording all typical disturbances superimposed on the ideal signal; it is based on both IEC standards 61000-4-30 and 61000-4-7 [1] [2] and on the directive for the Consultation of the Italian Authority for the Electric Power and Gas of April 6, 2005. The latter presents the peculiar features of an experimental monitoring system for the mid voltage electric energy distribution network whose experimentation should lead the distributing companies to the respect of the Voltage Quality (VQ) monitoring obligation. According to the above mentioned regulations, the proposed VI acquires both line voltage and current waveforms and carries out the innovating power quality indexes calculations in times comparable with those of other commercially available instruments; in order to obtain an accurate estimation of the parameters of interest a suitable Fast Fourier Transform interpolation algorithm is implemented in the VI. The laboratory prototype is based on a low cost data acquisition card equipped with suitable current and voltage sensors; the VI code is developed using National Instruments LabVIEW® Professional Development System and Mathworks MATLAB® and achieves very interesting performances.

Antonio Delle Femine, Carmine Landi, Mario Luiso
An Automated Test Equipment For Calibration Of Energy Meters

Calibration of electrical energy meters (EEM) is coming up as a metrological concern. Latest EU directives, about measuring instruments adopted for commercial transactions, state that their accuracy must be verified in actual operating conditions. This requirement is leading all laboratories involved in EEM calibration in serious difficulty because this kind of metrological verification is, at the moment, still not fully developed or even clarified. In this paper a proper automated measurement station able to perform calibration, also on-site, is presented, the compensation techniques for improving spectral purity of test signals integrity are discussed, finally performance evaluation and examples of EEM metrological verification are shown.

Page 802 of 936 Results 8011 - 8020 of 9356