chore(hq): daily sync 2026-02-17

hq/hq/condensations/2026-02-16-isogrid-sota-review.md

@@ -0,0 +1,37 @@
+## 📝 Orchestration Condensation: P-Adaptive-Isogrid State-of-the-Art Review
+**Date:** 2026-02-16
+**Participants:** Webster, Tech-Lead
+
+### Context
+This document synthesizes a state-of-the-art (SOTA) review and an internal gap analysis for the P-Adaptive-Isogrid optimization tool. The goal was to identify critical gaps and prioritize improvements by comparing our current architecture to modern best practices in isogrid and stiffened panel optimization.
+
+### Key Findings from State-of-the-Art Research (Webster)
+- **Parametric Generation:** Modern tools are moving beyond rigid triangular patterns to free-form stiffener layouts using methods like Parametric Level Set Method (PLSM) or NURBS splines. This allows ribs to align more naturally with principal stress paths.
+- **FEA Integration & Acceleration:** The standard workflow couples a parametric engine with an FEA solver. To manage computational cost, **surrogate models** (e.g., Gaussian Process, Neural Networks) are used to predict performance, drastically reducing the number of required high-fidelity FEA runs.
+- **Optimization Algorithms:** Bayesian optimization methods, particularly Tree-structured Parzen Estimator (TPE) as implemented in Optuna, are the SOTA for efficiently navigating high-dimensional parameter spaces.
+- **Feature Integration:** Holes, bosses, and keep-out zones are not post-processed. They are defined as constraints within the design space, allowing the optimizer to intelligently route load paths around them from the start.
+
+### Gap Analysis & Recommendations (Tech-Lead)
+The Tech-Lead's review, based on the SOTA context, identified critical strengths, gaps, and risks in our current tool.
+
+#### Strengths (What We Already Do Well)
+- ✅ **Solid Foundation:** Use of spatially-varying density fields, industry-standard Delaunay triangulation, and TPE for optimization is well-aligned with SOTA.
+- ✅ **Manufacturability:** Embedding manufacturing constraints (min rib width, fillet radii, keepout zones) is a key strength, putting the tool ahead of many academic counterparts.
+- ✅ **Robust Architecture:** The reserved-region AFEM architecture and JSON-only geometry transfer are robust design choices.
+
+#### Critical Gaps (What We Are Missing)
+- ❌ **Buckling Blind Spot (HIGH RISK):** The current optimization objective checks only stress and displacement, completely ignoring buckling. This is the single biggest technical risk, as isogrids are often buckling-critical.
+- ❌ **No Topology Optimization Seeding:** The density field relies on heuristics, not on proven topology optimization methods (like SIMP/LSM) that could provide a more optimal starting point.
+- ❌ **Single-Objective Optimization:** The tool conflates mass, stress, and displacement into a single objective using arbitrary penalty weights. It lacks support for multi-objective optimization (e.g., NSGA-II) which would yield a Pareto front of choices for the engineer.
+- ❌ **Isotropic Density Field:** The density field is uniform in all directions, whereas real load paths are directional. Anisotropic density would produce more efficient structures.
+- ❌ **No Analytical Benchmarks:** The tool is not validated against classical solutions, such as those in the NASA CR-124075 isogrid handbook.
+
+### Top 5 Prioritized Improvements
+1.  **P1: Local Pocket Buckling Check (HIGH):** Add a cheap, analytical buckling check during geometry generation to flag or penalize designs prone to this primary failure mode.
+2.  **P2: Principal Stress Direction Alignment (MEDIUM-HIGH):** Introduce an anisotropic term to the density field to align ribs with dominant load paths.
+3.  **P3: Multi-Objective Support (MEDIUM):** Refactor the objective function to use Optuna's native multi-objective samplers, providing the engineer with a Pareto front.
+4.  **P4: Analytical Benchmark Suite (MEDIUM):** Implement classical isogrid equations to provide an "efficiency ratio" for generated designs.
+5.  **P5: Density Field Smoothing (LOW-MEDIUM):** Add a Gaussian smoothing pass to the density field to prevent sharp transitions that cause stress concentrations.
+
+### Conclusion
+The P-Adaptive-Isogrid tool has a strong and modern foundation. However, it is critically undermined by a blind spot to buckling failure. The prioritized improvements, especially the immediate addition of a buckling check, are essential for the tool to produce safe and genuinely optimal designs. Adopting multi-objective optimization and validating against analytical benchmarks are the next steps to elevate it to a state-of-the-art solution.

hq/hq/condensations/2026-02-16-material-priority-lightweight-bracket.md

@@ -0,0 +1,20 @@
+## 📝 Condensation: Material Priority for Lightweight Bracket
+**Date:** 2026-02-16
+**Channel:** #decisions
+**Thread:** Material Priority for Lightweight Bracket
+**Participants:** Antoine, Manager, Secretary
+
+### Context
+The Technical Lead completed a comparison of 6061-T6 and 7075-T6 aluminum alloys for a new lightweight bracket. A decision was needed on whether to prioritize structural performance or other factors like thermal management, weldability, and cost.
+
+### Decision
+**Structural performance is the top priority.** The selected material will be **7075-T6**.
+
+### Rationale
+Antoine's directive was to "prioritize structural!". This indicates that the weight-saving and strength characteristics of 7075-T6 are more critical to the project's success than the other manufacturing and thermal considerations.
+
+### Action Items
+- [ ] Manager to direct the Technical Lead to proceed with 7075-T6 for the bracket design and analysis.
+
+### Supersedes
+- None

hq/hq/projects/lightweight-bracket/CONTEXT.md

@@ -0,0 +1,86 @@
+# Lightweight Bracket — Project Context
+
+**Created:** 2026-02-16  
+**Status:** Design Phase  
+**Owner:** Technical Lead
+
+---
+
+## Material Decision
+
+| Property | Value |
+|----------|-------|
+| **Selected Material** | Al 7075-T6 |
+| **Decision Date** | 2026-02-16 |
+| **Decision By** | Antoine (CEO) |
+| **Rationale** | Prioritize structural performance / weight savings |
+
+### 7075-T6 Key Properties
+- Density: 2.81 g/cm³
+- UTS: 572 MPa
+- Yield: 503 MPa
+- Elongation: ~11%
+- Thermal conductivity: 130 W/m·K
+- CTE: 23.2 µm/m·°C
+
+### Rejected Alternative
+- 6061-T6 — better thermal conductivity, weldability, and cost, but lower strength-to-weight
+
+---
+
+## Design Requirements
+*(To be defined — awaiting detailed requirements from CEO/Manager)*
+
+- [ ] Load cases (magnitude, type, direction)
+- [ ] Geometric envelope / mounting constraints
+- [ ] Displacement / stiffness targets
+- [ ] Fatigue / cycle life requirements
+- [ ] Manufacturing constraints (machining vs. additive)
+- [ ] Weight target
+
+---
+
+## Next Phase: Preliminary Design & Analysis Plan
+
+### Phase 1 — Requirements & Baseline
+1. **Define load cases** — static, dynamic, thermal (if any)
+2. **Establish geometric envelope** — mounting points, clearances, interfaces
+3. **Set performance targets** — max displacement, stress margins, weight budget
+4. **Create baseline CAD geometry** in NX
+
+### Phase 2 — FEA Baseline Analysis
+1. **Mesh** — CQUAD4/CHEXA (mesh convergence study required)
+2. **Boundary conditions** — match physical mounting (bolted? welded? pinned?)
+3. **SOL 101** linear static — baseline stress & displacement
+4. **SOL 103** modal — check natural frequencies vs. excitation environment
+5. **Validate** — analytical hand-calcs for sanity check
+
+### Phase 3 — Design Optimization
+1. **Identify design variables** — wall thickness, rib placement, fillet radii, topology
+2. **Formulate optimization** — minimize mass, constrain stress (σ_y / FOS) and displacement
+3. **Topology optimization** (if applicable) — SOL 200 or Simcenter topology
+4. **Parametric study** — LAC pattern via Atomizer framework
+5. **Iterate** to converged optimum
+
+### Phase 4 — Validation & Deliverables
+1. **Mesh convergence** confirmation on final design
+2. **Margin of safety** report (yield, ultimate, buckling if thin-walled)
+3. **Fatigue assessment** if cyclic loading present
+4. **Note on 7075-T6 ductility** — 11% elongation is moderate; flag any high-strain regions
+5. **Final report** with full documentation
+
+---
+
+## Open Questions / Gaps
+- [ ] **G1:** Bracket function — what does it support? What assembly?
+- [ ] **G2:** Load cases — not yet defined
+- [ ] **G3:** Geometric constraints — no envelope defined
+- [ ] **G4:** Manufacturing method — machining assumed, confirm
+- [ ] **G5:** Factor of safety requirements
+- [ ] **G6:** Any thermal loads? (7075-T6 lower conductivity noted as accepted trade-off)
+- [ ] **G7:** Fatigue/cycle life requirements
+
+---
+
+## Superseded Decisions
+- None