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Practical Case Studies on Vibration Analysis PDF: A Data-Driven Approach to Predictive Maintenance

pre-load force issue

m peak-to-peak) at high speeds. Orbit shape analysis and startup data showed a steep rise in amplitude above 12,000 RPM, indicating a or alignment error. The fix involved verifying the machine train alignment and checking bearing pad clearances.

Quick fault-signature cheat-sheet (useful for the PDF)

Avoid beginner mistakes:

• Noise floor elevation – early bearing wear.
• Sidebands – looseness, modulation, gear faults.
• Sub-synchronous activity – instability or rub.

The team removed the fan housing cover. They discovered that the fan blades had uneven cement dust caked on three of six blades. Cleaning the blades and performing a two-plane balance reduced the 1x peak by 90%. Practical Case Studies On Vibration Analysis Pdf

The Asset:

Induced Draft (ID) Fan, 1800 RPM, sleeve bearings. The Complaint: High overall vibration (0.45 in/sec RMS) exceeding ISO 10816-3 limits. Maintenance suspected unbalance due to dust buildup on blades. The Data: A standard velocity spectrum showed a dominant peak at 1x RPM (30 Hz) in the horizontal direction. Vertical readings were 60% lower. Practical Case Studies on Vibration Analysis PDF: A