Development of Vibrations Indicators for Rotating Machines Monitoring: Case of Gas Turbines

The quivering monitoring of rotating motor use indicators, their various values allow us to run a suggestion of correction the machines, If the limit worth, defined by the averages of these indicators surpassed limits an analysis and fault cases will be required. These limits are outlined by norms, we cite average ISO 10816.By a new and particular calculations of machines shakings responses we will try in this moderate work to define, in a natural way, development of a new forecast method for the quiverings rotating machines response and quivering limites opttimization.We have used numerical forethought by finished dissimilarities where it will be used the model spring–mass plan, we calculated the reaction of the system according to movement parameters of the model factors used (rigidity, dampen and frequency).The maximum free response of spring-masse system is function of the dampen and stiffness coefficients; it is depicted by the efforts opposite to that of the excitation. It’s presented by the ratio of inflexibility coefficient to that of dampen and including expression of only organic frequency [1-3].The ratio of maximum forced shakings, at a constant frequency, and the free shakings is equal to the percentage of damping and the stiffness coefficients.In prior study we have optimized averages limits of machines vibration by using the neverending ratio of still allowable values to admissible for all groups of machines corresponding the norm ISO 10816-1. We assumed that the admissible absoluate vibrations principles according averages corresponds to equilibrium. We have additional the admissible limit shakings to the still admissible values, and to different thresholds. An approximation calculation signify that we can increase norms only earlier.An algorithm for fault disease in industrial alternating machines facing new operating conditions rise is developed on the support of input indicators, culled from vibrations spectrums. Indicators pick is used to improve diagnosis accomplishments by the help of a composite approach using several pick criteria and various classifiers [4-6].In this study we also elaborated a new sign definition of machines quiverings, we choses importants machines, gas turbines. The indicator is the percentage of absolute to relative vibration, it’s the categorical vibrations of significance per unit of rotor vibrations dislocation. It’s the ratio of the RMS categorical value of the bearing to the rotor quiverings velocity, that gives us information on the evolution of the defaults.This idea of vibration signs of rotating machines, allows to have more chance to monitor them. Norms secondhand are ISO 10816-4 and ISO 7919-4, which include certain and relative value thresholds.We hope that on machines using, the practical application of these signs will be useful, And further that this work will be developed in future and will cause scientific research or in general area.

Author(s) Details:

Bendjaima Belkacem,
600 logements- M’sila- Algeria.

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Keywords: Absolate vibrations, relative vibrations, vibrations indicators, vibrations norms

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