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downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/docs/v0_8/ansys_execution_guide.md

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+# ANSYS Mechanical Version 0.8 Execution Guide
+
+## Import
+
+Use `analysis/ansys/v0_8/apdl/asterion_v0_8_optimized_line_model.inc` or reconstruct line bodies from the CSV node and element tables. Assign BEAM188 circular-tube sections and the controlled aluminium screening material.
+
+## Connections and masses
+
+Do not leave subsystem masses as free MASS21 elements. Couple each remote mass to its reviewed attachment frame. Run a joint-stiffness sensitivity with rigid, nominal and reduced-stiffness connections.
+
+## Required analyses
+
+1. LC-STR-02 propulsion thrust.
+2. LC-STR-07 misaligned docking.
+3. LC-STR-08 balanced counter-rotating ring braking.
+4. LC-STR-09 single-ring brake fault.
+5. Aft-supported modal analysis.
+6. Free-free modal analysis.
+7. Pre-stressed modal sensitivity for powered rotating operation.
+8. Linear buckling screening followed by nonlinear local submodels where required.
+
+## Mesh study
+
+Use at least three beam subdivisions per 2.5 m bay for the first run. Refine until the controlling displacement and first flexible frequency change by less than 5%. Local joint submodels require shell or solid refinement independent of the global line model.
+
+## Required result evidence
+
+- deformation contours;
+- beam axial force, bending moment and torsion;
+- reaction-force balance;
+- modal effective mass and mode descriptions;
+- mesh-convergence table;
+- analytical or Python correlation;
+- solver warnings and unit audit;
+- signed engineering interpretation.
+
+The included Python values are correlation targets, not substitute ANSYS results.

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/docs/v0_8/nx_redesign_tutorial.md

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+# Siemens NX Version 0.8 Redesign Tutorial
+
+## 1. Create the new arrangement
+
+Duplicate the Version 0.4 assembly arrangement and name it `V0_8_OPTIMISED_STRUCTURE`.
+
+## 2. Update the master skeleton
+
+Set `spine_radius = 1800 mm`. Retain all X station coordinates and regenerate the eight octagonal spine rails through associative points. Verify that ring, tank, module and docking interfaces remain controlled by the master coordinate systems rather than by edge references.
+
+## 3. Update frame members
+
+- Longerons: 160 mm OD × 6 mm wall.
+- Octagonal frames: 130 mm OD × 5 mm wall.
+- Bay diagonals: 100 mm OD × 4 mm wall.
+
+Create Part Family members for each tube family and replace the Version 0.3 frame components through assembly constraints.
+
+## 4. Add ring torque braces
+
+At each of the 24 outer ring nodes, create two diagonal braces to the nearest inner support nodes on opposite angular sides. Use 90 mm OD × 4 mm wall tubes. Pattern the seed braces by 30 degrees and mirror them to the second ring.
+
+## 5. Add docking load spreaders
+
+Create eight 100 mm OD × 4 mm wall struts between the docking ring and the corresponding octagonal nodes at X = 14,000 mm. Confirm that the struts form a continuous axial load path and do not intersect pressure modules or the Skimmer separation envelope.
+
+## 6. Add propulsion longitudinal struts
+
+For each of the six propulsion mounts, add one strut to X = −18,500 mm and one to X = −13,500 mm. Use 120 mm OD × 5 mm wall tubes. Check plume, radiator and maintenance clearances.
+
+## 7. Validate the assembly
+
+- update all WAVE links;
+- run Examine Geometry;
+- run static interference and clearance checks;
+- update mass properties;
+- verify the vehicle CG against `calculations/v0_8/updated_cg_loading_cases.csv`;
+- export Parasolid or STEP for local shell submodels;
+- export the line topology for ANSYS verification.
+
+## 8. Drawing changes
+
+Update the general arrangement, primary-structure assembly drawing, docking-interface drawing and ring-support drawing. Add revision clouds and identify Version 0.8 members with the `OPT` suffix.

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/docs/v0_8/optimization_design_basis.md

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+# Version 0.8 Optimisation Design Basis
+
+## Objective
+
+Reduce the three Version 0.5 structural concerns without allowing uncontrolled mass growth:
+
+- ring emergency-braking flexibility;
+- forward docking-frame flexibility; and
+- propulsion-mount displacement.
+
+## Constraints
+
+- home-PC-scale beam model;
+- no change to overall vehicle length or ring diameter;
+- no fictional materials;
+- aluminium screening properties retained;
+- idealised structural mass target below 10,500 kg;
+- first supported flexible mode at least 0.15 Hz;
+- misaligned-docking translation no more than 25 mm;
+- propulsion translation no more than 5 mm.
+
+## Decision logic
+
+The DOE varied spine depth, section sizes, ring-brace count and docking-spreader geometry. H3 was selected as the lowest-mass candidate that met all final criteria with useful margin. H4 was stiffer but added more than 620 kg for only approximately 2.65 mm additional docking improvement. H8 doubled the ring-brace count and added more than 1.6 tonnes without improving docking response.
+
+## Model limitations
+
+- rigid beam joints;
+- no shell interaction;
+- no bearing compliance;
+- no bolt, weld or latch flexibility;
+- no geometric nonlinearity;
+- no imperfections;
+- approximate nearest-node placement of subsystem masses;
+- fixed-aft support used only as a comparative screening boundary condition.

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/docs/v0_8/release_manifest.json

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+{
+  "release": "0.8.0",
+  "selected_design": "H3",
+  "nodes": 222,
+  "elements": 648,
+  "structural_mass_kg": 10423.430670108912,
+  "dry_docked_mass_kg": 53223.43067010891,
+  "first_supported_mode_Hz": 0.1964088051840446,
+  "misaligned_docking_mm": 22.8695049967966,
+  "propulsion_translation_mm": 0.2148503461176776,
+  "balanced_braking_mm": 1.8464527340647812,
+  "single_ring_fault_mm": 3.486900488908973,
+  "native_file_status": "not generated; neutral geometry and procedures supplied"
+}

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/docs/v0_8/requirements_risk_closure.md

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+# Version 0.8 Requirements and Risk Closure
+
+| Item | Version 0.5 status | Version 0.8 evidence | Status |
+|---|---|---|---|
+| STR-001 propulsion load path | Local bending dominated | Twelve longitudinal propulsion struts; 0.215 mm screening displacement | Provisionally closed |
+| STR-001 docking load path | 52.82 mm misalignment displacement | Deeper spine and eight load spreaders; 22.870 mm | Provisionally closed |
+| STR-005 modal identification | First supported mode 0.1308 Hz | First supported mode 0.1964 Hz | Provisionally closed |
+| R-008 ring dynamic coupling | Same-direction braking torque over-conservative | Counter-rotation represented; separate fault case added | Reduced, open for transient analysis |
+| R-011 ideal joints | Unresolved | Joint-sensitivity template and local-submodel requirement added | Open |
+| R-013 ring imbalance | Static single-sector screening only | Improved global stiffness; transient imbalance still required | Open |
+| Mass growth | Not controlled | DOE and 10,500 kg structural-mass criterion | Closed for screening phase |
+
+“Provisionally closed” means the independent screening target is met. It does not replace authoritative ANSYS evidence or detailed-joint validation.

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/docs/v0_8/version_0_8_release_notes.md

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+# ASTERION FCTA-1 — Version 0.8 Release Notes
+
+Version 0.8 converts the Version 0.5 findings into a controlled redesign. The selected H3 design is not the lightest candidate and not the stiffest candidate; it was selected because it satisfies every provisional Version 0.8 criterion with lower mass than the heavier H4 and H8 alternatives.
+
+## Main changes
+
+1. **Central spine:** radius increased from 1.2 m to 1.8 m while retaining 160 × 6 mm longerons.
+2. **Frames and diagonals:** increased to 130 × 5 mm and 100 × 4 mm respectively.
+3. **Ring torque path:** 48 cross-spokes create triangulated torque paths between the outer rings and inner support structure.
+4. **Docking:** eight long load spreaders transfer docking moments to station X=14 m.
+5. **Propulsion:** twelve longitudinal struts convert the thruster load path from local bending to predominantly axial action.
+6. **Braking model:** simultaneous braking now applies opposite torques to counter-rotating rings. A separate single-ring fault case is retained.
+
+## Selected results
+
+- Idealised structural mass: **10423.4 kg**
+- Dry docked mass: **53223.4 kg**
+- Misaligned docking: **22.870 mm**
+- Propulsion thrust: **0.215 mm**
+- Balanced braking: **1.846 mm**
+- Single-ring fault braking: **3.487 mm**
+- First supported mode: **0.1964 Hz**
+
+These remain screening results from an ideal-joint Euler–Bernoulli frame model. Authoritative ANSYS results are still required.