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A STATISTICAL ANALYSIS OF BALL BEARING VIBRATION TESTS FOR QUIET MACHINERY.
NAVY MARINE ENGINEERING LAB ANNAPOLIS MD
The specification for low-vibration level machinery requires the use of quiet bearings. Before these bearings are accepted from the bearing manufacturer, a sample for each bearing lot must be vibration tested according to Military Specification MIL-B-17931. It is the purpose of this report to determine the type and characteristics of the statistical distribution from accumulated data from vibration tests of bearings purchased under Revision A of the specification NT 2 bearings. While the distribution of the vibration data, in general, was found to be slightly skewed, the distribution of the logarithms of the data is reasonably represented by the normal or Gaussian distribution. The mean and standard deviation was determined graphically by use of probability paper for almost 9000 bearings submitted by three bearing manufacturers. By comparing the mean and standard deviation for different bearing sizes and manufacturers, the relative quietness of bearings produced under this specification can be determined, both by source and by bearing size. Author
Research and development rept.,