Two independent power branches feed a common output breaker. A spatial logic tree shows the top event as common-breaker failure OR both source-branch failures. Toggle events and compare Boolean logic with independent-event probability.
• 3D scene parts: Independent source branches; and gate; common output breaker event; or gate / top event; lost supply indicator. • Controls: Source A fails; Source B fails; Common breaker fails; Source A failure probability (0.01–0.5 fraction); Source B failure probability (0.01–0.5 fraction); Common breaker failure probability (0–0.1 fraction). • Live readouts: Top event active (0/1); Top-event probability; Both sources failed (0/1); Minimal cut sets. • Guided experiments: One source fails; Both sources fail. • Four tabs (visual laboratory, curves and measurements, experiments, learn and assess), a model-verification run, a timestamped event log and a trial report.
Top = C OR (A AND B) Ptop = qc + (1−qc)qa·qb Minimal cut sets: {C}, {A,B}
Representative systems-engineering teaching example. Equipment geometry and animation time are illustrative; this is not an equipment qualification, safety assessment or certification tool. Independent basic events with no repair, timing or shared causes. Event toggles illustrate a realization, while probability inputs define a separate statistical model. Try the preset experiments, then compare the live readouts with the equations.
No. The stated model omits real qualification evidence and system-specific assumptions.
Combine basic failures with explicit logic.
Representative systems-engineering teaching example. Equipment geometry and animation time are illustrative; this is not an equipment qualification, safety assessment or certification tool. Independent basic events with no repair, timing or shared causes. Event toggles illustrate a realization, while probability inputs define a separate statistical model.