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+# Knowledge Base — Hydrotech Beam
+
+**Project:** Hydrotech Beam Structural Optimization
+**Generation:** 003
+**Last updated:** 2026-02-11
+
+---
+
+## Overview
+
+I-beam optimization for a test fixture. Steel (AISI 1005) cantilever beam with lightening holes in the web. Goal: minimize mass from **1,133.01 kg** baseline while meeting displacement (≤ 10 mm) and stress (≤ 130 MPa) constraints.
+
+**Key confirmed parameters (Gen 003):**
+- Beam length: 5,000 mm (`beam_lenght` ⚠️ typo in NX), cantilever — left fixed, right loaded
+- Load: 10,000 kgf downward at free end
+- Baseline mass: **1,133.01 kg** (expression `p173: body_property147.mass`)
+- DV baselines: face=21.504mm, core=25.162mm, holes_dia=300mm, hole_count=10
+- Material: AISI Steel 1005 (density 7.3 g/cm³)
+- Mesh: CQUAD4 thin shell, 33.7 mm element size
+- **Solver:** DesigncenterNX 2512 (NX Nastran SOL 101)
+- **First results (2026-02-11):** Displacement=17.93mm, Stress=111.9MPa, Solve time ~12s/trial
+
+## Components
+
+| Component | File | Status |
+|-----------|------|--------|
+| Sandwich Beam | [sandwich-beam.md](components/sandwich-beam.md) | ✅ Updated Gen 002 |
+
+## Materials
+
+| Material | File | Status |
+|----------|------|--------|
+| Steel AISI 1005 | [steel-aisi.md](materials/steel-aisi.md) | ✅ Updated Gen 002 |
+
+## FEA
+
+| Model | File | Status |
+|-------|------|--------|
+| Static Analysis (SOL 101) | [fea/models/sol101-static.md](fea/models/sol101-static.md) | ✅ Updated Gen 003 — Solver running, first results obtained |
+
+## Generations
+
+| Gen | Date | Summary |
+|-----|------|---------|
+| 001 | 2026-02-09 | Initial KB from intake + technical breakdown |
+| 002 | 2026-02-10 | KBS session processing — confirmed geometry, BCs, mesh, material, mass correction |
+| **003** | **2026-02-11** | **First real results! NX version fix (DesigncenterNX 2512), path resolution, backup/restore architecture, history DB, mass extraction via journal** |
+
+## Gap Tracker
+
+### ✅ CLOSED
+
+| # | Item | Resolution | Closed In |
+|---|------|------------|-----------|
+| G1 | Beam length and support conditions | 5,000 mm cantilever (left fixed, right free) | Gen 002 |
+| G2 | Loading definition | 10,000 kgf point load, downward (−Y), at free end | Gen 002 |
+| G8 | Mesh type and density | CQUAD4 thin shell, 33.7 mm element size (67.4/2) | Gen 002 |
+
+### 🟡 PARTIALLY RESOLVED
+
+| # | Item | Known | Remaining |
+|---|------|-------|-----------|
+| G5 | Hole geometric feasibility | Span = 4,000 mm, offsets = 500 mm fixed. Baseline: 10 holes × 300 mm → ~144 mm ligament (OK) | Need collision check at DV extremes. 15 × 450 mm WILL overlap. Need feasibility constraint. |
+| G9 | Stress allowable basis | AISI 1005 yield ~285 MPa. 130 MPa → SF ≈ 2.2 | Need confirmation that 130 MPa limit still applies to updated model. |
+
+### ❓ STILL OPEN
+
+| # | Item | Why It Matters | Priority |
+|---|------|---------------|----------|
+| G7 | NX parametric rebuild reliability | Untested across full DV range — need corner-case testing | Medium |
+| G15 | `p6` (hole_span) as potential DV | Antoine suggested it could be optimized. Decision needed. | Medium |
+
+### ✅ CLOSED (Gen 003 — 2026-02-11)
+
+| # | Item | Resolution | Closed In |
+|---|------|------------|-----------|
+| G3 | Displacement measurement location | Max Tz at free end, extracted via pyNastran OP2 | Gen 003 |
+| G4 | Stress constraint scope | Whole model max von Mises (CQUAD4 shell) | Gen 003 |
+| G6 | Result sensors in Beam_sim1.sim | Using pyNastran OP2 parsing, not NX sensors | Gen 003 |
+| G10 | Baseline displacement | 17.93 mm at baseline-ish DVs | Gen 003 |
+| G11 | Baseline stress | 111.9 MPa at baseline-ish DVs | Gen 003 |
+| G12 | `beam_half_height` value | 250 mm — confirmed via binary introspection | Gen 002+ |
+| G13 | `beam_half_width` value | 150 mm — confirmed via binary introspection | Gen 002+ |
+| G14 | Hole diameter expression name | `holes_diameter` — confirmed via binary introspection | Gen 002+ |
+
+## Open Tasks
+
+1. **Run full 51-trial DOE** — solver pipeline operational, execute Phase 1
+2. **Corner-case testing** — verify NX rebuild at DV extremes (G7)
+3. **Decision on `p6` as DV** — consult Manager/CEO (G15)
+4. **Phase 1 → Phase 2 gate review** — after DOE completes, assess feasibility landscape