<span data-metadata=""><span data-metadata=""><span data-buffer="">Observed Anomaly AI-Detected Condition
Misalignment or mechanical looseness detected in the coupling between the traction motor and gearbox (Unit No. 4).
<span data-metadata="">About
Vibration data from the monitored metro rail vehicle indicates structural irregularities at the coupling interface between the traction motor and gearbox. This issue is often the result of:
• Mechanical looseness at the shaft ends,
• Axial/radial misalignment due to improper installation,
• Or wear and tear in the coupling elements (e.g., flexible elements, bolts, or keys).
The irregularities are evidenced by increased vibration amplitudes and intermittent impact-like signatures observed in the vibration-time graph, especially during acceleration and deceleration phases. These are typical indicators of faulty mechanical transmission across a coupling under load transitions.
<span data-metadata=""><span data-buffer="">Gearbox Coupling Misalignment / Looseness
Detectable by
<span data-metadata=""><span data-metadata=""><span data-buffer="">ROI Impact
• Prevents premature wear in coupling sleeves and bolts
• Reduces torsional stress on motor and gearbox shafts
• Minimizes vibration-induced fatigue in the motor-bogie interface
• Estimated Labor Cost: $23,000–$45,000
• Repair Time: 10–16 hours (includes bogie access, alignment tools, re-centering)
<span data-metadata=""><span data-buffer="">Analytical Diagnostic Summary
1. Vibration Signatures:
• Time-domain data reveals high-energy impacts during acceleration and deceleration.
• Envelope RMS and kurtosis values exceed normal thresholds during these dynamic phases.
2. Cluster Analysis (AI):
• Vibration data was grouped into 3 clusters based on severity.
• This sample was classified under Cluster 3: Anomalous behavior with elevated RMS and non-linear kurtosis—typical of coupling faults.
• Distinct deviation from baseline Cluster 1 (healthy behavior).
3. Mechanical Interpretation:
• The AI and vibration trends point to mechanical looseness or misalignment at the coupling connection.
• Impacts correlate with speed change, suggesting torque shock transmission through the joint.
• Possible contributing factors: bolt fatigue, coupling wear, or improper alignment between motor shaft and gearbox input.
