Fan Vibration Meter Guide
Why fan vibration matters
Fan vibration is a signal. It shows how smoothly a fan rotates under load. A small vibration may be normal. A rising value can reveal dirt buildup, bent blades, loose mounts, bearing wear, imbalance, or resonance. This calculator helps convert simple speed and displacement data into velocity, acceleration, frequency, force, and severity values.
What the calculator measures
The tool starts with fan speed in revolutions per minute. It converts speed into hertz and angular speed. Then it uses displacement amplitude to estimate vibration velocity and acceleration. You can enter peak, peak to peak, or RMS displacement. The form also accepts rotor mass, eccentricity, blade count, bearing span, natural frequency, sample time, and sample count. These inputs make the result more useful for maintenance review.
How to read the results
RMS velocity is often the clearest general vibration value. Higher velocity usually means stronger mechanical movement. Acceleration is useful for fast faults, bearing issues, and high speed fans. Displacement is helpful when slow fans move far from center. Imbalance force estimates the rotating force caused by a small offset mass path. Blade pass frequency shows how often blades pass a fixed point. This can help compare vibration peaks with fan geometry.
Using vibration severity
The severity message is a guide, not a replacement for field inspection. Low values suggest stable operation. Medium values deserve review, trend tracking, and bolt checks. High values suggest shutdown planning, balancing, bearing checks, or alignment work. Use the measured velocity field when you have a real meter reading. Otherwise, the calculator estimates velocity from displacement.
Best practice
Measure at the same location each time. Keep sensor direction consistent. Record speed, load, temperature, and mounting condition. Compare readings over days or weeks. A steady trend is more useful than one isolated value. Clean blades before final diagnosis. Confirm foundations are tight. Inspect guards, ducts, pulleys, belts, and couplings. If resonance ratio is near one, change speed carefully. Use professional instruments for critical machines. This calculator supports screening, planning, reports, and learning. It helps turn raw readings into practical maintenance decisions.
Save report with date, location, operator, and sensor notes. Clear records make future comparisons faster, safer, and more accurate.