Self-directed project
Predictive Maintenance: Industrial ML for Fault Detection
Condition-Monitoring Engineer · AI / ML · August 2026
A ProoV case study · educational project, not employment
Built an end-to-end rolling-bearing fault detector from vibration data: engineered RMS, kurtosis, crest factor, and envelope-spectrum defect-frequency features; trained a compact depth-capped decision tree on training bearings only; and evaluated it on held-out bearings with catch-rate and false-alarm metrics. The candidate also localized the fault to the outer race via BPFO dominance and justified an alarm threshold with explicit maintenance-cost tradeoffs.
Graded against
- Feature engineering (signal to honest numbers)25%
- Held-out evaluation (honest measurement)25%
- Cost-based threshold decision + memo25%
- Compact model + embedded-budget justification15%
- Plain-language explanation10%
Passed · pass mark 60/100
What stood out6
- Computed envelope-spectrum energy around the supplied BPFO/BPFI/BSF/FTF frequencies and correctly identified BPFO as dominant
- Chose a shallow decision tree with stated depth 1 and 3 nodes, explicitly within the embedded budget
- Reported held-out catch-rate and false-alarm rate rather than relying on training performance
- Defended the alarm threshold with concrete euro costs and a plain-language explanation tied to the model's own numbers
- Leakage-Free Feature Engineering
- Honest Model Evaluation
The work I submitted20 tasks
12 tasks · 8.6k characters · Python · 8 written answers · 481 words
- Initial Prediction62 characters
- Example Load Plot HealthyPython · 860 characters
- Load Plot Signal CodePython · 1.8k characters
- Load Plot Signal205 characters
- Example Rms WorkedPython · 698 characters
- Time Features143 characters
- Freq FeaturesPython · 1.1k characters
- Fault Location239 characters
- Train Classifier363 characters
- Evaluation Heldout288 characters
- Threshold Decision335 characters
- Decision Memo2.5k characters
- Initial Prediction9 words
- Example Load Plot Healthy81 words
- Load Plot Signal Code163 words
- Load Plot Signal15 words
- Example Rms Worked72 words
- Time Features10 words
- Freq Features117 words
- Fault Location14 words
Summarised on purpose — the submitted code and writing stay private so this page cannot be reused as an answer key. The full submission sits behind the verified certificate.