When performing a vibration analysis for rotating machinery, what is essential?

Correct Answer: Option B — A baseline vibration signature should be established as a reference, and a historical record of periodic analyses should be maintained. Vibration amplitudes at various frequencies are compared.

Effective vibration analysis requires establishing a baseline signature during normal operation. By maintaining a historical record of periodic analyses, engineers can identify trends in vibration amplitudes at specific frequencies, allowing for the early detection of mechanical degradation before catastrophic failure occurs in critical shipboard rotating equipment.