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downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/primary_structure/v0_3/assembly_tree_v0_3.md

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+# NX Assembly Tree — Version 0.3
+
+```text
+AST-1000-PRIMARY-STRUCTURE-ASM
+├── AST-0001-MASTER-SKELETON
+├── AST-1100-SPINE-TRUSS
+│   ├── AST-1110-LONGERON-FAMILY
+│   ├── AST-1120-TRANSVERSE-FRAME-FAMILY
+│   └── AST-1130-DIAGONAL-BRACE-FAMILY
+├── AST-1200-RING-SUPPORT-A
+│   ├── AST-1201-RING-CIRCUMFERENCE
+│   ├── AST-1202-SPOKE-FAMILY
+│   └── AST-1203-HUB-LINK-FAMILY
+├── AST-1210-RING-SUPPORT-B
+├── AST-1300-PROPULSION-FRAME
+└── AST-1400-FORWARD-DOCK-FRAME
+```
+
+Use arrangements for presentation solids, beam-centreline export and subsystem interface review.

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/primary_structure/v0_3/nx_expressions_v0_3.txt

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+# ASTERION PRIMARY STRUCTURE EXPRESSIONS — VERSION 0.3
+# Apply explicit units inside Siemens NX.
+
+spine_half_length = 21000 mm
+spine_truss_radius = 1200 mm
+spine_longeron_count = 8
+spine_frame_angle = 360 deg / spine_longeron_count
+nominal_bay_pitch = 2500 mm
+
+longeron_od = 160 mm
+longeron_wall = 6 mm
+frame_od = 120 mm
+frame_wall = 5 mm
+diagonal_od = 90 mm
+diagonal_wall = 4 mm
+
+ring_support_count = 2
+ring_support_x_1 = -2500 mm
+ring_support_x_2 = 2500 mm
+ring_sector_count = 12
+ring_sector_angle = 360 deg / ring_sector_count
+ring_centroid_radius = 12000 mm
+ring_beam_od = 200 mm
+ring_beam_wall = 6 mm
+ring_spoke_od = 120 mm
+ring_spoke_wall = 5 mm
+
+propulsion_frame_x = -16000 mm
+propulsion_mount_count = 6
+propulsion_mount_radius = 3200 mm
+propulsion_boom_od = 140 mm
+propulsion_boom_wall = 5 mm
+
+docking_frame_x = 21400 mm
+docking_frame_radius = 800 mm
+docking_node_count = 8
+docking_link_od = 140 mm
+docking_link_wall = 5 mm

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/primary_structure/v0_3/nx_primary_structure_tutorial.md

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+# Siemens NX Primary-Structure Build Tutorial
+
+## 1. Create the controlled parts
+
+Create these native files on the NX workstation:
+
+- `AST-1000-PRIMARY-STRUCTURE-ASM.prt`
+- `AST-1100-SPINE-TRUSS.prt`
+- `AST-1200-RING-SUPPORT-A.prt`
+- `AST-1210-RING-SUPPORT-B.prt`
+- `AST-1300-PROPULSION-FRAME.prt`
+- `AST-1400-FORWARD-DOCK-FRAME.prt`
+
+Keep `AST-0001-MASTER-SKELETON.prt` from Version 0.2 as the top-level geometry authority.
+
+## 2. Import expressions
+
+Create the expressions listed in `nx_expressions_v0_3.txt`. Preserve meaningful names and units. Do not dimension structural features with anonymous sketch dimensions when a controlled expression exists.
+
+## 3. Spine truss
+
+1. WAVE-link the vehicle centreline, truss-radius circle and station planes.
+2. At the aft station create eight points on the truss-radius circle.
+3. Use associative curves parallel to +X for the longeron axes.
+4. Trim or divide them at each station plane.
+5. Create transverse octagonal frames at all structural stations.
+6. Add alternating diagonal curves between adjacent stations.
+7. Use `Tube` for presentation solids, or retain centreline curves for idealisation.
+8. Put centreline, simplified tube and interface geometry in separate reference sets.
+
+## 4. Ring supports
+
+1. WAVE-link the ring centre plane and 12 m centroid circle.
+2. Pattern 12 outer nodes at 30-degree intervals.
+3. Create 12 circumference segments and 12 radial spokes.
+4. Connect the hub ring to the nearest central-truss nodes.
+5. Keep bearing race, drive hardware and pressure-shell interfaces as separate future components.
+
+## 5. Propulsion frame
+
+Create six mount coordinate systems at 60-degree intervals and 3.2 m radius on X = -16 m. Build paired booms from nearby truss nodes to each mount. Publish each mount CSYS for propulsion-pod WAVE linking.
+
+## 6. Docking frame
+
+Create an eight-node, 800 mm radius frame 400 mm forward of the main truss end. Link each docking node to one longeron endpoint. Publish the docking axis, mating plane and keep-out cylinder.
+
+## 7. Validation in NX
+
+- Run Examine Geometry and Assembly Clearance.
+- Check all tube centreline intersections.
+- Confirm no zero-length or duplicate members.
+- Measure mass using assigned preliminary material.
+- Verify the ring and docking coordinate systems.
+- Export Parasolid or STEP from the locally built native structure for ANSYS if permitted by the installed licence.