ROOTCASTLE / ENGINEERING LAB
Cavitation
Bubbles can form when local liquid pressure drops below vapour pressure; subsequent collapse creates impacts.
Mechanism
Bubbles can form when local liquid pressure drops below vapour pressure; subsequent collapse creates impacts.
Typical symptoms
Broadband vibration, crackling and fluctuating performance may occur.
Measurement method
Measure vibration together with suction/discharge pressure, flow and temperature.
Alternative explanations
Turbulence, air entrainment and mechanical rubbing can produce similar noise.
Additional measurements
NPSH assessment, pump curve, suction line and operating point.
Likely frequency components
broadband / geniş bant / широколентов / banda ancha
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 ↗