July 06,2026
1. Reverse‑calculate limit from measured vibration and temperature rise curve.
2. Vibration threshold: RMS velocity >2.5 mm/s indicates excessive preload or incorrect clearance.
3. Temperature: use cooling slope after shut‑down to judge over/under‑lubrication.
4. Contamination: introduce a<sub>ISO</sub> factor based on oil cleanliness.
5. Mounting interference: heat inner ring; measured reduction in clearance should be within ±15% of calculated value.
6. Material fatigue scatter 0.8-1.2 is typically normal.
