vecteur d’espace, alors que la figure 9 représente la DSP de élaborés à partir de ces résultats. The results obtained by this fault detection technique are satisfactory and interesting because they make it possible to anticipate breakdowns and, therefore, to program and control the maintenance costs of industrial systems without affecting production.This article deals with a new motor-operated valves (MOVs) condition monitoring method. It is recommended that only that part of Part I up to formula (33) and the portion dealing with star-delta transformations be read before proceeding with Part II. Data-derived filters perform better : DSP d'un courant de phase (haut) et du vecteur d'espace courant (bas). designsThis paper describes a new analytical model for the influence of rolling-element bearing faults on induction motor stator current. Therefore, in some cases the misalignment response is hidden and does not show up in the vibration spectrum. Conclusions: Animal plague has occurred actively in key areas of Qinghai province in recent years, and an outbreak of human plague in some areas is found. and temporal attributes. positives (resp. Part I deals with the resolution of unsymmetrical groups of numbers into symmetrical groups. Boulenger et C. Pachaud. Dunod, 2007. hal-00395508, version 1 -15 Jun 2009Join ResearchGate to find the people and research you need to help your work.The twelfth Annual Space Surveillance Workshop hosted by MIT Lincoln Laboratory was held 5-7 April 1994. The purpose of this series of workshops is to provide a forum for the presentation and discussion of space surveillance issues. MOVs mainly consist of an induction machine driving a valve through a mechanical actuator.

domain knowledge but no expertise in machine learning. The practical validation of this plural methodology, in the case of a bearing degradation, was carried out on a variable speed fan motor of 0.25 HP. Epidemic areas mainly distributed in the 4 states of Yushu, Hainan, Hercynien, Haibei. This article presents a new method of monitoring such actuators by analyzing their current supply. A short discussion of harmonics in three-phase systems is given. Cumulative incidence of human plague was 27 cases, with incidence of 73 cases, 29 cases of death, and death rate 39.73%. If any of the even multiples of the motor rotational speed is at or close to one of the system natural frequencies, a resonance condition occurs. Programmed image filters generally result in low to medium performing solutions. Monitoring and early warning should be strengthened in the key areas, and comprehensive prevention and control measures should be implemented to reduce the incidence and prevalence of the plague. The system response depends heavily on the relation between the system natural frequencies and the motor rotational speed.

achieved by this approach are illustrated with experimental data.statoriques sont le plus souvent déjà mesurés et disponibles dans les organes de commande tels que les variateurs.
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During our experimental study, we found that one of the best methods for diagnosing single or multiple mechanical faults in induction motor systems is MCSA (Motors Current Signature Analysis), to which we applied the FFT (Fast Fourier transform) spectral analysis completed by the park vector approach orbital (OPVA) applied to the components of the current stator vector. Generalized system equations of motion for a system under misalignment and unbalance conditions were derived using the component mode synthesis technique. The task of designing a

monocomposante à valeurs complexes équivalente.
direct methods of zeroing the negative frequencies, or using Hilbert which is similar to the “quadrature“ filters used in modem As it is possible to detect other machine faults by monitoring the stator current, a great interest exists in applying the same method for bearing fault detection. Both the measured and predicted spectra show that unbalance and misalignment can be characterized primarily by one and two times shaft running speed, respectively. The theoretical predictions are in good agreement with the experimental measurements. Such an analytic This Proceedings documents most of the presentations from this workshop. électriques, permettant de fusionner les deux opérations Figure 2 : Réponses en fréquence théoriques des filtres à Figure 3 : DSP du module du signal analytique d’un courant de phase obtenu par les deux approches proposées.

... courants de phase et du vecteur d’espace correspondant. Formulas are derived for three-phase circuits. Indeed, these monitoring techniques rely on the measurement of an internal mechanical quantity and require the presence of human operators in dangerous power plants areas. Play this game to review Other. For this, we proceed to the extraction of the characteristics appearing in the supply current signal of the diagnostic system, by the application of three complementary approaches. The theoretical study results in new expressions for the stator current frequency content. Prevalent season was from May to October. The observed and computed values of the transient currents have been plotted for a number of cases.

n. winding [Tech.] to achieve self programming and specialization of image filters that learn to search images by their content, sequential order,

transform filters, have undesirable defects.

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