AutoGain
Living Reliability Systems
Product Brochure
Fault Tree Architect
Visual fault tree analysis with AND/OR/Voting gates, exact probability calculation, minimal cut sets, and importance ranking — connected to your DFMEA and field data.
Problems It Eliminates
- Component FMEA captures individual risks but misses how failures combine at system level
- Qualitative 1-10 ratings don't tell you actual probability of system failure
- Finding all ways a system can fail is tedious and error-prone by hand
- Fault trees built in separate tools with no link to FMEA or field data
Gate Types
| Gate | Logic | Use Case |
|---|
| AND | ALL inputs must fail | Redundancy, backup systems |
| OR | ANY input failure causes output | Series reliability, single points of failure |
| Voting (K-of-N) | K or more of N fail | Partial redundancy, majority voting |
| Transfer | Reference external sub-tree | Modular, reusable analysis |
| Inhibit | Input + condition | Conditional failure propagation |
Key Capabilities
📊 Probability Calculation
Exact top event probability from gate logic. Support for rare-event approximation and sensitivity analysis.
✂️ Minimal Cut Sets
Automatically find all minimal event combinations causing system failure. Critical path identification.
📈 Importance Measures
Fussell-Vesely, Birnbaum, Risk Achievement Worth. Rank components by contribution to unreliability.
🖱️ Visual Drag-and-Drop
Interactive tree construction. Zoom, pan, and navigate large fault trees with smooth interaction.
🔗 DFMEA Integration
Import FMEA failure modes as basic events. Use occurrence ratings as base event probabilities.
🤖 AI FTA Agent
AI suggests gate structures based on system description. Identifies common failure patterns. Gemini 2.0.
Importance Measures Explained
| Measure | What It Tells You | Formula |
|---|
| Fussell-Vesely (FV) | Fraction of system unreliability due to this component | FV = 1 - R_reduced / R_system |
| Birnbaum | Rate of change of system reliability w.r.t. component reliability | ∂R_sys/∂R_i |
| Risk Achievement Worth | How much system risk increases if component is removed | R_sys(qi=1) / R_sys |
Event Types
| Type | Symbol | Description |
|---|
| Basic Event | Circle | Leaf-level failure with probability or failure rate |
| Intermediate Event | Rectangle | Named subsystem-level failure |
| Undeveloped Event | Diamond | Not analyzed further |
| House Event | Pentagon | Expected to occur (conditioning) |
| Transfer Event | Triangle | Reference to external sub-tree |
DFMEA Integration Flow
→ Import from FMEA
Pull failure modes from Magnus DFMEA as basic events with occurrence ratings mapped to probabilities.
← Feedback to FMEA
System-level FTA results feed back to DFMEA severity assessment and risk prioritization.
Standards Compliance
| Standard | Application |
|---|
| IEC 61025 | Fault Tree Analysis methodology |
| IEC 61508 | Functional safety — system Pf |
| ISO 26262 | Automotive functional safety |
| ARP4761 | Aerospace safety assessment |
| MIL-HDBK-338 | Military reliability engineering |
| ISO 14971 | Medical device risk management |
Who Is This For?
- Systems Engineers performing top-down reliability analysis
- Reliability Engineers quantifying system failure probability
- Safety Engineers building cases for functional safety
- Design Engineers evaluating redundancy strategies
- Quality Managers needing system-level risk quantification
Ready to Quantify System-Level Risk?
Contact us — wayne@autogainsystems.com | www.magnusaiengineering.com