Industrial hydraulic pumps are complex structures on which vibrations can be unusable for reliabi... more Industrial hydraulic pumps are complex structures on which vibrations can be unusable for reliability, fatigue of components and productivity. The application of vibration analysis and diagnosis on a huge water treatment pump at the City of Montreal’s facility is presented in this paper. By using a Short Time Auto-Regressive (STAR) method combined with a modal test, it is seen that the dynamic properties and behavior of the pump included both rotating and fixed structures can be evaluated from the experimental analysis on the vibration measurement signal during its normal working condition. Natural frequencies, damping ratios and rotating speed can be clearly identified and monitored. Vibration factors are estimated and evaluated with current codes. It is shown that the analysis and diagnosis from operational vibration measurement is a very effective technique for the assessment of the huge machines in real working condition.
Previous works made possible to partially achieve the detection and the severity of degradation f... more Previous works made possible to partially achieve the detection and the severity of degradation for a defective bearing, using an appropriate neural network, but only for a restricted number of localized defects. To avoid this limitation, a new technique has been developed for a better characterization and recognition without restriction of bearings defects number. This technique, called the shocks extractor, consists in associating the neural network to an advanced technique of signal processing. The method, using the time waveform, consists to recognize, the pattern of each defect, to extract and treat it separately of the original signal. Thus, the effect of each defect in the vibratory signal can be treated independently of the others that make possible to localize the default and to recognize its severity of degradation.
Previous works made possible to partially achieve the detection and the severity of degradation f... more Previous works made possible to partially achieve the detection and the severity of degradation for a defective bearing, using an appropriate neural network, but only for a restricted number of localized defects. To avoid this limitation, a new technique has been developed for a better characterization and recognition without restriction of bearings defects number. This technique, called the shocks extractor, consists in associating the neural network to an advanced technique of signal processing. The method, using the time waveform, consists to recognize, the pattern of each defect, to extract and treat it separately of the original signal. Thus, the effect of each defect in the vibratory signal can be treated independently of the others that make possible to localize the default and to recognize its severity of degradation.
Condition Monitoring of Machinery in Non-Stationary Operations, 2012
In high speed machining, the interaction between the variable drive frequencies and the excitatio... more In high speed machining, the interaction between the variable drive frequencies and the excitation frequencies due to bearing defects of the spindle is studied in this paper. The interference between both phenomena causes an amplification of vibration, harmful for the machining stability and chatter, the surface quality, as well as the dynamic behavior of the spindle. Even if the implications of such interference highly affect the reliability of the machining process and the production by creating new critical speeds, this phenomenon has not been yet identified as the cause of the problem. The excited frequencies resulting from this interference imply new critical rotational speeds that should simply be prohibited while establishing cutting parameters. The observation of this phenomena help to diagnose bearing defects. Transient experimental results -conducted up to 30000 rpm- showed the interference phenomenon and pinpointed the critical speeds that can be avoided, after bearing maintenance.
... Compte tenu de la complexité du site, liée à l'anisotropie du comportement du massif, il... more ... Compte tenu de la complexité du site, liée à l'anisotropie du comportement du massif, il a été nécessaire de faire ... et expérimentale de l'endommagement durant l'excavation d'une saignée et son reconfinement Cyrille Balland, Jean-Bernard Kazmierczak, Jamil Damaj Tranchée ...
Industrial hydraulic pumps are complex structures on which vibrations can be unusable for reliabi... more Industrial hydraulic pumps are complex structures on which vibrations can be unusable for reliability, fatigue of components and productivity. The application of vibration analysis and diagnosis on a huge water treatment pump at the City of Montreal’s facility is presented in this paper. By using a Short Time Auto-Regressive (STAR) method combined with a modal test, it is seen that the dynamic properties and behavior of the pump included both rotating and fixed structures can be evaluated from the experimental analysis on the vibration measurement signal during its normal working condition. Natural frequencies, damping ratios and rotating speed can be clearly identified and monitored. Vibration factors are estimated and evaluated with current codes. It is shown that the analysis and diagnosis from operational vibration measurement is a very effective technique for the assessment of the huge machines in real working condition.
Previous works made possible to partially achieve the detection and the severity of degradation f... more Previous works made possible to partially achieve the detection and the severity of degradation for a defective bearing, using an appropriate neural network, but only for a restricted number of localized defects. To avoid this limitation, a new technique has been developed for a better characterization and recognition without restriction of bearings defects number. This technique, called the shocks extractor, consists in associating the neural network to an advanced technique of signal processing. The method, using the time waveform, consists to recognize, the pattern of each defect, to extract and treat it separately of the original signal. Thus, the effect of each defect in the vibratory signal can be treated independently of the others that make possible to localize the default and to recognize its severity of degradation.
Previous works made possible to partially achieve the detection and the severity of degradation f... more Previous works made possible to partially achieve the detection and the severity of degradation for a defective bearing, using an appropriate neural network, but only for a restricted number of localized defects. To avoid this limitation, a new technique has been developed for a better characterization and recognition without restriction of bearings defects number. This technique, called the shocks extractor, consists in associating the neural network to an advanced technique of signal processing. The method, using the time waveform, consists to recognize, the pattern of each defect, to extract and treat it separately of the original signal. Thus, the effect of each defect in the vibratory signal can be treated independently of the others that make possible to localize the default and to recognize its severity of degradation.
Condition Monitoring of Machinery in Non-Stationary Operations, 2012
In high speed machining, the interaction between the variable drive frequencies and the excitatio... more In high speed machining, the interaction between the variable drive frequencies and the excitation frequencies due to bearing defects of the spindle is studied in this paper. The interference between both phenomena causes an amplification of vibration, harmful for the machining stability and chatter, the surface quality, as well as the dynamic behavior of the spindle. Even if the implications of such interference highly affect the reliability of the machining process and the production by creating new critical speeds, this phenomenon has not been yet identified as the cause of the problem. The excited frequencies resulting from this interference imply new critical rotational speeds that should simply be prohibited while establishing cutting parameters. The observation of this phenomena help to diagnose bearing defects. Transient experimental results -conducted up to 30000 rpm- showed the interference phenomenon and pinpointed the critical speeds that can be avoided, after bearing maintenance.
... Compte tenu de la complexité du site, liée à l'anisotropie du comportement du massif, il... more ... Compte tenu de la complexité du site, liée à l'anisotropie du comportement du massif, il a été nécessaire de faire ... et expérimentale de l'endommagement durant l'excavation d'une saignée et son reconfinement Cyrille Balland, Jean-Bernard Kazmierczak, Jamil Damaj Tranchée ...
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