Download e-book for kindle: Diagnostics of Rotating Machines in Power Plants: by G. Diana (eds.)

By G. Diana (eds.)

ISBN-10: 3211826130

ISBN-13: 9783211826133

ISBN-10: 3709127068

ISBN-13: 9783709127063

The papers provided in this party tested the main major points of diagnostic suggestions, emphasizing the significance of predictive upkeep in decreasing construction shortages and the prices of plant administration. The contributions of those authors permit a serious comparability of the numerous reports in constructing and using the various diagnostic methodologies hired in different components of the area. the subsequent difficulties are mentioned: features of situation tracking structures - facts acquisition concepts and knowledge processing methodologies; collection of transducers and of size element destinations; information compression suggestions; alarm degrees assessment (acceptance regions); innovations for detecting malfunction stipulations; diagnostic methodologies for the online and off-line identity of the reason for fault; professional platforms; definition of the information for the presentation up to the mark rooms of tracking info and diagnostic effects; rotordynamic types used, off-line, to verify faults clinically determined on-line.

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Extra info for Diagnostics of Rotating Machines in Power Plants: Proceedings of the CISM/IFToMM Symposium, October 27–29, 1993, Udine, Italy

Sample text

Even rotor imbalance does not necessarily cause a change in the amplitude of 1X component. But if the balance state does change, there will be either a change in 1X amplitude, or 1X phase, or both. A good on-line computerized monitoring system will provide the capability to trend not only vibration amplitudes and frequencies, but phase angles as well, for at least the 1X and 2X vibration components. Actually, amplitude and phase values can be monitored together as a true vector quantity. Individual software alarm setpoints are set for both amplitude and phase.

Turnilll! 6, each rule is expressed basically with AND or OR. The relationship between AND and OR, the basic forms of each rule, and the IF-THEN rule are shown in Fig.?. It clearly shows trigger phenomena which start execution of the rules. This is the point different from ordinary decision trees and fault trees. >O). 7(a) means that the certainty factor CF. of the conclusion C is calculated from the certainty factor CF. of phenomenon A, the certainty factor CFb of phenomenon B and the certainty factor CF, of the rule according to the EMYCIN method.

D) The points where vibration occ:urs and disappean deviate when the revolution speed ia Increasing and when decreasing. {e) The vibration occun and disappean auddenly. {0 Once the vibration occun, it does not decreue even if the revolution apeed is increased. (g) The whirl direction of vibration Is the same with the direction of rotation. Furthermore, there are ca1e1 where roton whirl at the revolution speed hilhcr than the fint order critical speed and alto lower than double of the first order critical speed.

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Diagnostics of Rotating Machines in Power Plants: Proceedings of the CISM/IFToMM Symposium, October 27–29, 1993, Udine, Italy by G. Diana (eds.)

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