72 lines
2.5 KiB
Markdown
72 lines
2.5 KiB
Markdown
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# Study: 01_doe_landscape — Hydrotech Beam
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> See [../../README.md](../../README.md) for project overview.
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## Purpose
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Map the design space of the Hydrotech sandwich I-beam to identify feasible regions, characterize variable sensitivities, and converge on a minimum-mass design that satisfies displacement and stress constraints.
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## Quick Facts
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| Item | Value |
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|------|-------|
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| **Objective** | Minimize mass (kg) |
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| **Constraints** | Tip displacement ≤ 10 mm, Von Mises stress ≤ 130 MPa |
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| **Design variables** | 4 (3 continuous + 1 integer) |
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| **Algorithm** | Phase 1: LHS DoE (50 trials) → Phase 2: TPE (60-100 trials) |
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| **Total budget** | 114–156 NX evaluations |
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| **Estimated compute** | ~4–5 hours |
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| **Status** | DRAFT — Awaiting pre-flight checks and review |
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## Design Variables
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| ID | Name | Range | Type | Baseline |
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|----|------|-------|------|----------|
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| DV1 | `beam_half_core_thickness` | 10–40 mm | Continuous | 20 mm |
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| DV2 | `beam_face_thickness` | 10–40 mm | Continuous | 20 mm |
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| DV3 | `holes_diameter` | 150–450 mm | Continuous | 300 mm |
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| DV4 | `hole_count` | 5–15 | Integer | 10 |
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## Baseline Performance
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| Metric | Value | Constraint | Status |
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|--------|-------|------------|--------|
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| Mass | ~974 kg | minimize | Overbuilt |
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| Tip displacement | ~22 mm | ≤ 10 mm | ❌ FAILS |
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| VM stress | unknown | ≤ 130 MPa | ⚠️ TBD |
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## Key Decisions
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- **Single-objective** formulation (DEC-HB-001)
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- **Two-phase** algorithm: LHS → TPE (DEC-HB-002)
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- **True integer** handling for hole_count (DEC-HB-003)
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- **Deb's feasibility rules** for constraint handling (infeasible baseline)
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- **Baseline enqueued** as Trial 0 (LAC lesson)
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## Files
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| File | Description |
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|------|-------------|
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| `OPTIMIZATION_STRATEGY.md` | Full strategy document (problem formulation, algorithm selection, risk mitigation) |
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| `atomizer_spec_draft.json` | AtomizerSpec configuration skeleton (DRAFT — open items must be resolved) |
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| `README.md` | This file |
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## Open Items Before Execution
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1. Beam web length needed (geometric feasibility of hole patterns)
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2. Displacement extraction method (sensor vs .op2 node parsing)
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3. Stress extraction scope (whole model vs element group)
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4. Baseline stress measurement
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5. SOL 101 runtime benchmark
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6. Corner test validation (16 bound combinations)
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## References
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- [BREAKDOWN.md](../../BREAKDOWN.md) — Tech Lead's technical analysis
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- [DECISIONS.md](../../DECISIONS.md) — Decision log
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- [CONTEXT.md](../../CONTEXT.md) — Project context
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---
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*Created by ⚡ Optimizer Agent | 2026-02-09*
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