Antoine
b88657b00c
Sources: 3 KBS capture sessions (20260210-132817, 20260210-161401, 20260210-163801)
Key changes:
- Mass corrected: 974 kg (p173) → 11.33 kg (p1) — KBS ground truth
- Beam length confirmed: 5,000 mm cantilever
- BCs confirmed: left fixed, right 10,000 kgf downward
- Material confirmed: AISI Steel 1005, density 7.3 g/cm³
- Mesh confirmed: CQUAD4 thin shell, 33.7 mm elements
- Hole geometry: span 4,000 mm (p6), offsets 500 mm fixed
- 3 gaps closed (G1, G2, G8), 6 new gaps identified (G10-G15)
- New expressions: beam_half_height, beam_half_width, beam_length, p6
Files: CONTEXT.md, kb/_index.md, kb/_history.md, kb/components/sandwich-beam.md,
kb/materials/steel-aisi.md, kb/fea/models/sol101-static.md, kb/dev/gen-002.md
3.8 KiB
3.8 KiB
CONTEXT.md — Hydrotech Beam Structural Optimization
Client
Hydrotech (internal test fixture)
Objective
Minimize beam mass while meeting displacement and stress constraints. Single-objective: minimize mass, constrain displacement (≤ 10 mm) and stress (≤ 130 MPa).
Key Parameters — Confirmed (Gen 002)
| Parameter | NX Expression | Current | Range | Units | DV? | Notes |
|---|---|---|---|---|---|---|
| beam_half_core_thickness | beam_half_core_thickness |
20 | 10–40 | mm | Yes (DV1) | Core half-thickness |
| beam_face_thickness | beam_face_thickness |
20 | 10–40 | mm | Yes (DV2) | Face sheet thickness |
| holes_diameter | ❓ (Gap G14) | 300 | 150–450 | mm | Yes (DV3) | Lightening hole diameter |
| hole_count | hole_count |
10 | 5–15 | integer | Yes (DV4) | Number of lightening holes |
| beam_length | beam_length |
5,000 | Fixed | mm | No | ✅ Confirmed KBS |
| beam_half_height | beam_half_height |
❓ (Gap G12) | — | mm | No | Half I-beam height |
| beam_half_width | beam_half_width |
❓ (Gap G13) | — | mm | No | Half flange width |
| hole_span | p6 |
4,000 | TBD | mm | Potential (G15) | Total span for hole distribution |
Constraints
- Max tip displacement: ≤ 10 mm
- Max von Mises stress: ≤ ~130 MPa (steel, conservative — Gap G9)
- Mass tracked via NX expression
p1← CORRECTED fromp173(Gen 002)
Baseline Performance — Confirmed (Gen 002)
| Metric | Value | Source | Confidence |
|---|---|---|---|
| Mass | 11.33 kg | NX expression p1, KBS session |
✅ High |
| Tip displacement | ❓ NEEDS RE-VERIFICATION (Gap G10) | Was 22 mm at old model state | ⚠️ Low |
| Max stress | ❓ NEVER MEASURED (Gap G11) | — | ❌ None |
| Material | AISI Steel 1005 | KBS session | ✅ High |
| Density | 7.3 g/cm³ | KBS session | ✅ High |
⚠️ Mass discrepancy resolved: Intake reported ~974 kg (
p173). KBS session confirmed 11.33 kg (p1). Seekb/dev/gen-002.mdfor full analysis.
Boundary Conditions — Confirmed (Gen 002)
| BC | Location | Value | Source |
|---|---|---|---|
| Fixed support | Left side (full edge) | All DOF constrained | ✅ KBS session |
| Applied force | Right side (free end) | 10,000 kgf downward (−Y) | ✅ KBS session — "project requirement" |
| Configuration | Cantilever | Left fixed, right loaded | ✅ KBS session |
Mesh — Confirmed (Gen 002)
| Property | Value | Source |
|---|---|---|
| Element type | CQUAD4 (thin shell) | ✅ KBS session |
| Element size | 33.7 mm (67.4/2) | ✅ KBS session |
| Idealization | Promote body → mid-surface extraction | ✅ KBS session |
Hole Geometry — Confirmed (Gen 002)
| Property | Value | Notes |
|---|---|---|
| Span | 4,000 mm (expression p6) |
Total distribution length |
| Start offset | 500 mm from beam start | Fixed requirement — not parametric |
| End offset | 500 mm from beam end | Fixed requirement — not parametric |
| Collision check | Required at DV extremes | 15 × 450 mm in 4,000 mm → overlap |
Model Files
- NX Part:
Beam.prt - FEM:
Beam_fem1.fem - Idealized part:
Beam_fem1_i.prt - Simulation:
Beam_sim1.sim - Solver: NX Nastran SOL 101 (static structural)
Future Expansion
- Material alternatives: Aluminum 6061, Stainless Steel ANSI 310 (per Antoine, KBS session)
p6(hole span) as additional design variable (pending decision)- Mesh refinement (Antoine: "Eventually we're going to be able to refine the element size")
Decisions
- 2026-02-08: Project received from Antoine
- 2026-02-10: KBS sessions processed → Gen 002 KB update. Mass corrected, BCs confirmed.
Status
Phase: Pre-optimization (baseline re-verification needed) Generation: 002 Channel: #project-hydrotech-beam Last KBS session: 2026-02-10T16:38:01