Project records
Validation
Each project includes source files, results and a reproducible acceptance record. The reports identify which checks ran against working code or numerical solvers and which used theoretical models.
Hardware: virtual bench and commissioning studies use declared geometry, material, load and sensor assumptions.
Software: local services and recovery tools run with synthetic data. Remote deployment assessments and browser-environment substitutes are labeled by method.
A matched failure case means the fault was detected as expected. It does not make that condition acceptable for operation.
Manufacturing design
Mounting plate rework fixture
22 geometry/tolerance/export checks pass; unittest regression results are in test-results.txt. 14 commissioning acceptance checks and 6 additional regression tests pass. Updated CAD passes 22 geometry/export checks and 7 CAD regressions; the failed bare-fit alternative remains documented.
Additional evidence: synthetic/theoretical
Machine and assembly design
Indexed conveyor changeover
14 geometry/tolerance checks pass; regression tests exercise invalid inputs and wear effects. 10 commissioning acceptance checks and 5 additional regression tests pass. The selected 30 N loaded-clearance case leaves 0.744 mm; the 150 N jam case is rejected.
Additional evidence: synthetic/theoretical
Structural analysis
Test fixture crosshead
43 executed checks pass; regression tests and invalid-input checks are recorded separately. 11 commissioning acceptance checks and 7 additional regressions pass. The selected combined translational/torsional envelope stays below 0.05 mm including a 0.0001 mm response-fit allowance.
Additional evidence: synthetic/theoretical
Thermal analysis
Heated platen
29 numerical checks pass; regression tests are included. 27 commissioning acceptance checks and 5 additional regressions pass. Six selected ambient/loss cases finish in band; all modeled fault cases retain energy balance and expected rejected/protected outcomes.
Additional evidence: synthetic/theoretical
Internal fluid flow
Dispensing nozzle
21 executed numerical/geometry checks pass, including six regression tests, pipe benchmark, three mesh levels and extended boundaries. Additional virtual bench: 14 verification checks; 243 tolerance/operating cases; 30 synthetic observations; four dosing cases. Original maximum-flow condition fails added system effects; computed bound 26.4 mm3/s.
Additional evidence: synthetic/theoretical
Flow and transport
Sampling chamber
26 executed checks pass, including seven regression tests, annular-flow benchmarks, tracer mass balance, three spatial grids and two time steps. Additional virtual bench: 29 checks; 162 dimensional/operating cases; six coupled response cases; three slow-wall refinement runs; four selected-design corners plus refined worst corner; 20 synthetic instrument readings.
Additional evidence: synthetic/theoretical
Control systems
Duplex pump controller
23 tests and 10 independent trace checkpoints passed. Additional virtual validation: 36 checks matched their expected outcomes. Adverse design conditions remain in the results.
Additional evidence: synthetic/theoretical
DC power systems
Outage recorder backup
16 tests; analytical runtime, energy conservation, step refinement and deliberately failing storage case. Additional virtual validation: 13 checks matched their expected outcomes. Adverse design conditions remain in the results.
Additional evidence: synthetic/theoretical
Instrumentation
Load-cell measurement chain
18 tests; exact calibration, Monte Carlo covariance, causal filters, analytic settling and drift preservation. Additional virtual validation: 12 checks matched their expected outcomes. Adverse design conditions remain in the results.
Additional evidence: synthetic/theoretical
Industrial engineering
Inspection queue capacity
20 regression and analytical-reference tests passed. Job, waiting-area and WIP-area balances passed in all 800 runs. Additional virtual validation: 9 checks matched their expected outcomes. Adverse design conditions remain in the results.
Additional evidence: synthetic/theoretical
Data engineering
Supplier catalog imports
20 database and HTTP tests pass, including concurrent approvals, response retries, rollback after a row write, rejected CSVs and role checks. The sample workflow was also exercised in a browser. A separate operations rehearsal passes 14 expected-outcome checks, including process crashes, checked snapshots, restore and a finite backup schedule.
Additional evidence: executed synthetic operations
Backend services
Webhook delivery queue
28 tests pass for claims, lease recovery, stale completions, retries, signatures, retention, destination restrictions and authorization. The executed response-loss scenario records one receiver effect for each retried event. A separate operations rehearsal passes 15 expected-outcome checks, including process crashes, checked snapshots, restore and a finite backup schedule.
Additional evidence: executed synthetic operations
Application engineering
Offline service notes
15 HTTP/SQLite tests and 16 separately observed Chrome IndexedDB checks. Added 13 worker-source simulations, 11 real process/recovery checks, five snapshot CLI checks and 10 theoretical deployment cases.
Additional evidence: executed synthetic operations and theoretical deployment
Systems tooling
Backup restore checks
13 regression tests and four fixture outcomes passed, plus 11 operational acceptance checks covering real process death, parallel restores, online snapshots, size limits, storage faults, and modeled PostgreSQL recovery.
Additional evidence: executed synthetic operations
Developer tooling
Database migration rehearsal
14 regression tests and four fixture outcomes passed, plus 10 operational acceptance checks covering process kills, overlap traffic, forward recovery, 100,000-row fixtures, held locks and theoretical PostgreSQL lock/index recovery.
Additional evidence: executed synthetic operations
Full-stack applications
Drawing release register
26 database/HTTP tests, 10 client-source workflow checks, eight process/recovery checks and 10 theoretical deployment cases. Exact client export bytes restore the verified PDFs and history.
Additional evidence: executed synthetic operations and theoretical deployment
Backend and data systems
Usage reconciliation ledger
24 tests pass, including duplicate ingestion, exact arithmetic, correction chains, both ingest/close lock orders, immutable exports, cache corruption detection, account isolation and role checks. A separate operations rehearsal passes 19 expected-outcome checks, including process crashes, checked snapshots, restore and a finite backup schedule.
Additional evidence: executed synthetic operations
Motion control and motor sizing
Servo-axis cycle planner
20 regression tests and 15 additional acceptance checks pass. The study evaluates 240 candidate/corner runs, exact energy balances, independent quadrature, a rejected overload and a rejected low-bandwidth tracking case.
Additional evidence: executed numerical and synthetic commissioning study
Vibration analysis
Skid vibration isolation
22 regression tests, 12 independent numerical checks and 19 acceptance checks pass. All 32 selected-design corners satisfy the declared operating and combined transient limits; the stiff retrofit is rejected for force transmission.
Additional evidence: executed numerical and synthetic dynamics study
Sheet-metal and assembly design
Benchtop instrument enclosure
26 geometric/export checks and 16 regression tests pass. An additional 14 manufacturing/service outcomes match expectations, including correctly rejected alternatives. Both 49-solid assemblies have no positive-volume overlaps; STEP round trips and DXF reconstructions agree with their reference geometry.
Additional evidence: synthetic/theoretical
Developer tooling
CI failure triage
30 behavioral tests and 13 executed operating checks pass. The reference history has 102 observations across 12 job attempts; the latest build has three final failures/errors, one retry pass, one recovery, one skipped test and one unreported identity.
Additional evidence: executed synthetic operations