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: plotted and interpreted the faulty waveform, engineered RMS/kurtosis/crest and envelope-spectrum defect-band features, trained a compact depth-1 decision tree on training bearings only, and evaluated it on held-out bearings with catch-rate and false-alarm metrics. The final memo defended a 0.41 alarm threshold using the student’s own cost numbers and correctly localized the fault to the outer race via BPFO.
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
- Used the provided envelope-spectrum helper and correctly found BPFO as the dominant defect band, matching an outer-race fault.
- Trained a very small decision tree (depth 1, 3 nodes) on training bearings only, which fits the embedded-budget constraint.
- Reported held-out catch-rate and false-alarm rate rather than evaluating on the training set.
- Connected the threshold choice to explicit cost figures and stated the cracked ring in plain maintenance language.
- Leakage-Free Feature Engineering
- Honest Held-Out Evaluation
The work I submitted19 tasks
11 tasks · 6.9k characters · Python · 8 written answers · 536 words
- Initial Prediction50 characters
- Load Plot Signal CodePython · 1.8k characters
- Load Plot Signal205 characters
- Example Rms WorkedPython · 697 characters
- Time Features143 characters
- Freq FeaturesPython · 1.2k characters
- Fault Location239 characters
- Train ClassifierPython · 1.3k characters
- Evaluation Heldout288 characters
- Threshold Decision335 characters
- Decision Memo697 characters
- Initial Prediction6 words
- Load Plot Signal Code163 words
- Load Plot Signal15 words
- Example Rms Worked72 words
- Time Features10 words
- Freq Features119 words
- Fault Location14 words
- Train Classifier137 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.