Development of Vibrations Indicators for Rotating Machines Monitoring: Case of Gas Turbines | Chapter 3 | Techniques and Innovation in Engineering Research Vol. 9

 The quivering monitoring of rotating engine use indicators, their various values allow us to run a suggestion of correction  the machines, If the limit worth, defined by the standards of these indicators  surpassed limits an analysis and fault studies will be required. These limits are outlined by norms, we cite standard  ISO 10816.By a new and particular calculations of machines shakings responses we will try in this shy work to define, in a plain way,  development of a new forethought method for the shakings rotating machines response and shaking limites opttimization.We have used numerical forecast by finished distinctnesses where it will be used the model spring–mass method, we calculated the answer of the system according to movement parameters of the model details used (rigidity, dampen and frequency).The maximum free response of spring-masse system is function of the dampen and stiffness coefficients; it is presented 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 everyday frequency [1-3].The ratio of maximum forced shakings, at a constant frequency, and the free quiverings is equal to the percentage of damping and the stiffness coefficients.In former study we have optimized averages limits of machines vibration by using the uninterrupted 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 quiverings to the still admissible values, and to different thresholds. An approximation calculation signify that we can increase norms only before.An algorithm for fault disease in industrial alternating machines facing new operating conditions rise is developed on the base of input indicators, derived from vibrations spectrums. Indicators election is used to improve diagnosis acts by the help of a mixture approach using several pick criteria and various classifiers [4-6].In this study we also elaborated a new sign definition of machines shakings, 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 shakings velocity, that gives us information on the evolution of the defaults.This idea of vibration signs of rotating machines, allows to have more likelihood to monitor them. Norms secondhand are  ISO 10816-4 and ISO 7919-4, which include categorical and relative value thresholds.We hope that on machines taking advantage, the practical application of these signs will be useful, And more that this work will be developed in future and will help scientific research situated on sides.

Author(s) Details:

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

Please see the link here: https://stm.bookpi.org/TAIER-V9/article/view/9984