Rolling element bearings are co mmon in any rotating machinery. The rolling element bearings subjected to failure under continuous running. Therefore they have received great attention in the field of condition monitoring. Different methods are detection and diagnosis of the bearing defects. Among them the commonly used technique is vibration signature analysis. The information obtained from the system vibration can be used for identifying its response subjected to various conditions. In rolling element bearing, contamination of lubricant grease by solid particles is one among the several reasons for early bearing failure. The main objective of this project is to investigate the effect of lubricant contamination by solid particles on rolling element bearing. This work is carried out to determine the vibrations on good and defective bearing in healthy grease and contaminant grease conditions. Obtained the vibration characteristi cs of healthy grease tested ball bearings are compared with those of contaminant grease tested ball bearings. Vibration signals are acquired fro m the ball bearings assembled in an experimental rig. The radial load was applied to the outer ring of the test bearing. An accelerometer placed on bearing housing measures radial vibration both in vertical and horizontal. The SKF -LGWA type of lubricants is used in this test, and also different types of solid particles are used as contaminants. The effect of contaminant concentration and particle size on vibration is to be studied. A way of monitoring machinery performance during operation is through mechanical vibration measurement. In rolling bearings, a sudden increase in vibration can be indicative of failure occurrence. In other techniques such as grease analyses and temperature monitoring can also provide warning of faults. But here, vibration monitoring is more versatile since it can reveal a wider range of faults
展开▼
