Online Ultrasonic Monitoring Of Bearing Wear.
Unpredicted bearing failures continue to plague industry with forced outages. As a result of these outages, many industries have attempted prevention by unnecessary inspections and premature bearing replacement. This work can be associated with significant incurred costs. Bearing failures often occur after a lengthy process of wear, related to factors such as abrasion, corrosion, and erosion. Over the years, several techniques for indirectly measuring bearing condition have been developed and used. These techniques, however, provide imprecise measurements of bearing damage and wear rates. Until recently, the only direct measure of bearing condition was visual inspection and dimensional checks, both requiring shutdown and disassembly. A bearing wear monitoring system has been developed to eliminate the interpretation of indirect symptoms and the need for bearing disassembly. The level of accuracy provides a diagnostic ability far more sensitive to wear than indirect methods such as vibration monitoring. In addition, the system provides data on the location and the extent of the problem. Finally, the ultrasonic technique reduces inspection costs, and eliminates the risk of improper reassembly that may follow inspections.
Chann, Jeffrey C. (1990). Online Ultrasonic Monitoring Of Bearing Wear.. Texas A&M University. Turbomachinery Laboratories. Available electronically from