Technical Reports

Improved Roller Bearing Wayside Detection Research - Phase I Laboratory Test Report

  • 01
  • May
  • 1998
AUTHOR: G. B. Anderson, J. E. Cline, R. A. Graff, R. L. Smith
SUBJECT: Evaluation
KEYWORDS: Acoustics, Roller Bearing Defects, Raceway Spalls, Water Etching, Loose Bearing Components, Spun Cones
ABSTRACT: A series of tests were performed at the Bearing Test Facility at the Transportation Technology Center in Pueblo, Colorado, to gather acoustic and acceleration emissions for a number of roller bearing defect types designated by the rail industry as a priority. This database will be used to develop data processing techniques for the recognition of these defect types via wayside sensor systems. The laboratory test series (Phase I of this program) consisted of operating each defective bearing over a number of axle speeds and bearing radial load for each of two bearing size classes (AAR Class E and F). The bearing defect types included raceway spalls (inner and outer ring, single or in multiples), roller defects, water etching, and loose inner rings (spun cones). After the tests were successfully conducted, it was determined that the database contained unique signatures of each defect type. The data was transmitted to a list of program participants on three compact discs. In Phase II of this program, a field test was conducted using the same defective bearings to gather wayside acoustic data needed for final development of wayside defective bearing detection systems. The Phase II tests were completed in November 1996. A second report will be issued for the Phase II field test.
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