ROOTCASTLE / ENGINEERING LAB
Resonance
Response grows when excitation approaches a natural frequency. Damping and stiffness govern the result.
Mechanism
Response grows when excitation approaches a natural frequency. Damping and stiffness govern the result.
Typical symptoms
Large amplitudes and phase changes may occur within a narrow speed range.
Measurement method
Track speed, amplitude and phase during a controlled run-up or coast-down.
Alternative explanations
Changing load or process excitation can also raise amplitude over a speed range.
Additional measurements
Impact testing, modal analysis and structural stiffness assessment.
Likely frequency components
excitation ≈ natural frequency
Limitations: without speed, load, mounting and transmission-path context, these examples are not diagnoses. Spectrum examples are conceptual, not complete fault models or field measurements.
SIMULATED · NOT LIVE TELEMETRY
Vibration / FFT
Model and assumptions
512 samples; deterministic sinusoids and seeded noise. FFT is one-sided peak amplitude, not RMS. Δf = fs/N. Hann coherent gain is corrected; spectral leakage can remain. The 4.7× component is not a physical bearing-fault model.
Educational model. Results are not sufficient to diagnose a machine or establish safe operating limits.
Further reading: SKF — Vibrations help find faulty components ↗