# Knowledge Base History — Hydrotech Beam

All modifications tracked by generation.

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## Gen 002 — 2026-02-10 — KBS Session Processing

**Source:** 3 KBS capture sessions recorded by Antoine (20260210-132817, 20260210-161401, 20260210-163801)
**Author:** Technical Lead 🔧
**Protocol:** OP_09 → OP_10 Step 2

**Updated:**
- `components/sandwich-beam.md` — confirmed geometry, all expression names, mass corrected to 11.33 kg (`p1`)
- `materials/steel-aisi.md` — confirmed AISI 1005, density 7.3 g/cm³, future material expansion noted
- `fea/models/sol101-static.md` — confirmed CQUAD4, 33.7 mm mesh, cantilever BCs, 10,000 kgf load
- `_index.md` — generation 002, gap tracker updated (3 closed, 2 partial, 6 new)

**Created:**
- `dev/gen-002.md` — full generation document with KBS transcript analysis and mass discrepancy resolution

**Key findings:**
- **Mass corrected:** 974 kg → 11.33 kg (expression `p1`, not `p173`)
- **Cantilever confirmed:** Left side fixed, right side loaded (10,000 kgf downward)
- **Beam length confirmed:** 5,000 mm
- **Mesh confirmed:** CQUAD4 thin shell, 33.7 mm elements
- **Material confirmed:** AISI Steel 1005, density 7.3 g/cm³
- **3 gaps closed** (G1, G2, G8), **6 new gaps identified** (G10–G15)
- **Antoine's directive:** "Please optimize" — considers model ready

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## Gen 001 — 2026-02-09 — Initial KB

**Source:** Project intake (CONTEXT.md) + Technical Lead breakdown (BREAKDOWN.md)
**Author:** Manager 🎯

**Created:**
- `components/sandwich-beam.md` — initial component file from intake data
- `materials/steel-aisi.md` — material placeholder
- `fea/models/sol101-static.md` — FEA model placeholder from breakdown
- `dev/gen-001.md` — generation document

**Key findings from breakdown:**
- Baseline FAILS displacement constraint (22 mm vs 10 mm limit)
- Feasible region may be narrow — stiffness and mass compete
- Sandwich effect (core thickness) is the primary stiffness lever
- 9 gaps identified requiring CEO input before proceeding