Atomizer/projects/hydrotech-beam/studies/01_doe_landscape/README.md

Study: 01_doe_landscape — Hydrotech Beam

See ../../README.md for project overview.

Purpose

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.

Quick Facts

Item	Value
Objective	Minimize mass (kg)
Constraints	Tip displacement ≤ 10 mm, Von Mises stress ≤ 130 MPa
Design variables	4 (3 continuous + 1 integer)
Algorithm	Phase 1: LHS DoE (50 trials) → Phase 2: TPE (60-100 trials)
Total budget	114–156 NX evaluations
Estimated compute	~4–5 hours
Status	DRAFT — Awaiting pre-flight checks and review

Design Variables

ID	Name	Range	Type	Baseline
DV1	beam_half_core_thickness	10–40 mm	Continuous	20 mm
DV2	beam_face_thickness	10–40 mm	Continuous	20 mm
DV3	holes_diameter	150–450 mm	Continuous	300 mm
DV4	hole_count	5–15	Integer	10

Baseline Performance

Metric	Value	Constraint	Status
Mass	~974 kg	minimize	Overbuilt
Tip displacement	~22 mm	≤ 10 mm	❌ FAILS
VM stress	unknown	≤ 130 MPa	⚠️ TBD

Key Decisions

• Single-objective formulation (DEC-HB-001)
• Two-phase algorithm: LHS → TPE (DEC-HB-002)
• True integer handling for hole_count (DEC-HB-003)
• Deb's feasibility rules for constraint handling (infeasible baseline)
• Baseline enqueued as Trial 0 (LAC lesson)

Files

File	Description
OPTIMIZATION_STRATEGY.md	Full strategy document (problem formulation, algorithm selection, risk mitigation)
atomizer_spec_draft.json	AtomizerSpec configuration skeleton (DRAFT — open items must be resolved)
README.md	This file

Open Items Before Execution

1. Beam web length needed (geometric feasibility of hole patterns)
2. Displacement extraction method (sensor vs .op2 node parsing)
3. Stress extraction scope (whole model vs element group)
4. Baseline stress measurement
5. SOL 101 runtime benchmark
6. Corner test validation (16 bound combinations)

References

• BREAKDOWN.md — Tech Lead's technical analysis
• DECISIONS.md — Decision log
• CONTEXT.md — Project context

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Created by ⚡ Optimizer Agent | 2026-02-09