Vibration Fault Spectrum Simulator

Every mechanical fault leaves its own trace in the spectrum. Choose a fault, change severity and speed; the time waveform and spectrum update instantly. An idealised model for training.

Overall level —mm/s RMS

Time waveform (4 revolutions)

Velocity spectrum, orders (X)

—

Signature: —
Dominant direction: —
Next step: —

These tools are intended for preliminary assessment and training. Decisions on critical equipment should be based on on-site measurement and expert evaluation.

How to use

Choose a fault type.
Increase severity and watch the signature grow.
Change speed: the peaks stay put on the order (X) axis, which is typical of speed-related faults.

Theory & formulas

The spectrum axis is in orders (multiples of running speed): 1X is shaft speed, 2X twice that. Speed-related faults stay at fixed positions on the order axis.

The model uses BPFO ≈ 3.58X (a 9-ball 6205-type bearing) and a 23-tooth pinion (GMF = 23X).

Overall level is the root sum of squares of the spectral components: V_rms = √(Σ v_i²).

Frequently asked questions

How do you tell unbalance from misalignment in the spectrum?

Unbalance produces a dominant radial 1X with low axial vibration. Misalignment usually shows a clear 2X, high axial vibration and roughly 180° phase difference across the coupling.