<p>In the calculation of the rolling bearings lifetime are taking in to consideration the distribution of the work load on each rolling elements, obliquity, internal operation clearance and pre-stressing. In the case of a rolling bearing with a defect, the internal operation clearance have an influence upon the evolution of its deterioration and remaining lifetime by: internal manufacturing clearance; the expansion of the inner ring when the rolling bearing is mounted on a adapter sleeve; the contraction of the outer ring when the rolling bearing is mounted in the housing; and the temperature difference between rolling bearing rings during operation. This paper presents an experimental study regarding to the influence of the internal operation clearance of the ZKL 1205K rolling bearing upon the remaining lifetime in same operating conditions. </p>
Rolling bearings are one of the most commonly mechanical elements used in the construction of dynamic equipment. This element can be considerate as a noise source as a result of relative motion of the components from their construction: rings, rolling elements and cage. The noise level increase with the increase of the roller bearings wear. By analyzing of the roller bearings wear level, which appear due to the component failure, it can be determine the deterioration stage and their remaining lifetime with direct implication to optimal replacement and reduced of the negatively aspect: noise pollution, materials and energy consumption, waste quantities. This paper presents an experimental study on the increase of noise level generated by rolling bearings ZKL 1205K in different deterioration stages.
This paper presents a theoretical study of the application of vibration envelope technique in the diagnosis of rolling bearings with the purpose of estimating their remaining life and of determining the proper time to perform the replacement of rolling bearings within the maintenance activity. Increasing the vibration level has as a consequence the lifetime reduction of rolling bearings. Enveloping is a vibration signal processing technique, necessary in the extraction of the defect characteristic frequencies from the frequency spectrums. By using the enveloping technique the premature wear of rolling bearings can be monitored. Rolling bearings are predisposed to a premature wear due to the execution and mounting quality, to the loading conditions during operation, to the very numerous cycles of operation and so on. This premature wear manifests itself through: 1. the generation of noise; 2. the loss of lubricant; 3. the failure of other components; 4. supplementary energy consumption. The present study also reveals the benefits of the predictive maintenance application in direct connection with the decrease of energy consumption, materials, noise pollution and waste quantities. At the same time, by condition monitoring and diagnostic of process equipment, the predictive maintenance has an important role about costs of maintenance activity because one third of these costs are lost due to improper application or unnecessary maintenance. Damage caused by improper maintenance can cause disasters at a large scale with negative consequences for people and environment.
This study shows the benefits of the modern methods application of the predictive maintenance in order to detect and diagnosis of rolling bearings wear. From the large amount of domains where predictive maintenance has been applied, there have been chosen to be case studied the equipment which have rolling bearings as components. Rolling bearings are predisposed to a premature wear because of the execution and mounting quality, of the very numerous cycles of operation, of loading conditions during the production operation, or of the improper lubrication, etc.. By applying modern wear detection methods of rolling bearings, the causes of producing it can be identified and all of them could be set aside in order to get an increasing lifetime of rolling bearings and of the process equipment.
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