In the modern world of predictive maintenance, the is often dismissed as a relic—a beginner's cheat sheet for those who don't understand Fast Fourier Transforms (FFT).
A proper wall chart shouldn't just identify the type of fault; it should also classify the severity . The ISO 10816 standards (now updated to ISO 20816) are the gold standard for this.
: Characterized by a strong 1x and 2x axial vibration.
Unbalance occurs when the center of mass does not align with the center of rotation. High amplitude at running speed. Direction: Primarily radial (horizontal and vertical). Phase: Stable 90∘90 raised to the composed with power Vibration Analysis Wall Chart Pdf
While traditional heavy-duty paper charts laminated onto workshop walls are excellent, keeping a PDF version on a tablet, laptop, or phone offers distinct benefits:
: Never diagnose a fault on spectrum shape alone; always verify with phase analysis to avoid false positives.
Common machinery issues like misalignment, unbalance, looseness, and bearing wear. In the modern world of predictive maintenance, the
The chart clearly indicated that "sidebands around bearing frequencies often appear in the spectrum, signifying early-stage bearing inner-race defects".
Visual representations of Fast Fourier Transform spectra, showing amplitude versus frequency.
Phase separates balance from misalignment. Your wall chart must include a simple table: | Fault | 1X Phase Vertical vs. Horizontal | | :--- | :--- | | Pure Imbalance | ~90° difference | | Misalignment | ~180° difference or unstable | | Resonance | Rapid shift near natural frequency | : Characterized by a strong 1x and 2x axial vibration
Distinguishes between Structural Looseness (bolts) and Rotating Looseness (bearing clearances). 4. Rolling Element Bearing Faults
As a bearing degrades, high-frequency energy spikes first, followed by non-synchronous defect frequencies, and finally, a total collapse of the spectrum into random noise. Step-by-Step Guide to Reading the Chart
Bearing component natural frequencies are excited ( ). Sidebands begin to form.