Definition
Bearing defect frequency is a specific vibration frequency, calculable from a bearing's geometry (number of rolling elements, contact angle, pitch diameter) and its rotational speed, that appears in the vibration spectrum when a particular part of the bearing (outer race, inner race, rolling element, or cage) is damaged. Identifying it lets a technician diagnose bearing damage before it is felt or heard directly.
Key facts
- A calculated, bearing-specific frequency, not a general vibration reading: different bearing geometries have different defect frequencies.
- Distinct frequencies exist for outer race, inner race, rolling element, and cage defects, allowing more specific fault localization.
- Detectable through vibration analysis well before the defect produces an audible sound or is otherwise externally apparent.
- Requires accurate bearing specification data to calculate correctly: an incorrect bearing model reference produces a wrong frequency.
How does Bearing defect frequency work or appear?
Bearing defect frequency indicates damage to a specific part of a bearing, calculated from its known geometry and the shaft's rotational speed, so that when vibration analysis finds energy concentrated at that exact calculated frequency, it points specifically to, for example, an outer-race defect rather than a general "something is wrong" signal.
What should technicians inspect for Bearing defect frequency?
A technician calculates the expected defect frequencies for the specific bearing installed (using its published geometry), then checks the measured vibration spectrum for peaks at those exact frequencies: a match confirms not just that the bearing is damaged, but specifically which part of it, guiding a more targeted inspection and repair decision.
FAQ
Frequently asked questions
What diagnostic significance does a bearing defect frequency have?
It has this significance: a specific, geometry-based vibration frequency that, when detected, indicates damage to a particular part of a bearing (outer race, inner race, rolling element, or cage) before other symptoms appear.
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