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‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_3/generation_output.txt‎

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{
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"nodes": 222,
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"elements": 580,
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"estimated_primary_mass_kg": 7742.28,
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"ring_acceleration_g": 0.2481,
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"mesh_faces": 18560,
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"mesh_vertices": 10440
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}

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_3/preliminary_structural_bom.csv‎

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section_id,family,outer_diameter_mm,wall_mm,total_length_m,idealised_mass_kg,material,status
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1,LONGERON,160.0,6.0,336.0,2740.737,Aluminium 7075-T6 conceptual,Beam idealisation only
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2,FRAME,120.0,5.0,154.298,783.221,Aluminium 7075-T6 conceptual,Beam idealisation only
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3,DIAGONAL,90.0,4.0,369.395,1121.776,Aluminium 7075-T6 conceptual,Beam idealisation only
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4,RING_BEAM,200.0,6.0,149.08,1531.891,Aluminium 7075-T6 conceptual,Beam idealisation only
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5,RING_SPOKE,120.0,5.0,259.2,1315.707,Aluminium 7075-T6 conceptual,Beam idealisation only
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6,INTERFACE_BOOM,140.0,5.0,32.355,192.795,Aluminium 7075-T6 conceptual,Beam idealisation only
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7,DOCK_FRAME,140.0,5.0,9.424,56.155,Aluminium 7075-T6 conceptual,Beam idealisation only

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_3/preliminary_structural_sizing.md‎

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# ASTERION Version 0.3 Preliminary Structural Sizing
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## Status
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These calculations define a **portfolio-level preliminary structure**. They are not flight certification, pressure-vessel substantiation, fracture-control approval, or human-rating evidence.
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## Baseline model
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- Eight aluminium longerons around a 1.2 m truss radius.
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- Nominal 2.5 m truss bays, with added stable interface stations.
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- Octagonal transverse frames and alternating diagonal braces.
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- Two 12-sector rotating-ring frames at X = -2.5 m and +2.5 m.
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- Twelve spokes per ring, with local hub links to the central truss.
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- Six propulsion load-transfer booms at X = -16 m.
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- Dedicated forward docking frame at X = +21.4 m.
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## Generated line model
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| Metric | Value |
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|---|---:|
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| Nodes | 222 |
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| BEAM188 elements | 580 |
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| Spine/interface stations | 21 |
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| Maximum bay length | 2.500 m |
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| Estimated idealised tube mass | 7,742.3 kg |
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The mass excludes joints, fittings, bearing races, pressure shells, fasteners, harnesses, local reinforcement, coatings, mechanisms and manufacturing allowances. Apply a maturity allowance before using it in a system mass budget.
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## Rotating-ring dynamics
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For radius r = 12 m and rotation rate 4.3 rpm:
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- Angular speed: 0.45029 rad/s
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- Tangential speed: 5.404 m/s
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- Centrifugal acceleration: 2.433 m/s² = 0.248 g
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- Design rotating mass per ring: 12,000 kg
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- Total distributed radial force per ring: 29,198.2 N
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- Equivalent radial force per outer node: 2,433.2 N
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- Uniform-ring hoop tension estimate: 4,647.0 N
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- 120 s emergency braking torque: 6,484.2 N·m
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The spoke analysis must also include local cabin-sector masses and imbalance; the uniform-ring equation alone is not sufficient for detailed design.
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## Longeron screening calculation
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Selected conceptual longeron: 160 mm outside diameter, 6 mm wall aluminium tube.
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| Quantity | Value |
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|---|---:|
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| Area | 2,902.8 mm² |
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| Second moment of area | 8.619e+06 mm⁴ |
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| Radius of gyration | 54.49 mm |
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| Docking load per longeron | 3,125.0 N |
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| Direct compressive stress | 1.077 MPa |
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| Yield screening factor | 467.2 |
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| Euler pinned-pinned critical load | 975.8 kN |
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| Euler buckling screening factor | 312.3 |
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This simple screening ignores joint eccentricity, imperfections, local shell buckling, load redistribution and combined bending. ANSYS model correlation and local joint submodels are required before any design claim.
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## Required Version 0.5 correlation
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1. Compare beam-model axial displacement with a hand truss calculation.
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2. Complete mesh/refinement studies for line, shell and local solid models.
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3. Check free-free modes and identify the first six rigid-body modes.
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4. Replace ideal rigid joints with realistic joint stiffness sensitivity cases.
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5. Run linear buckling, then nonlinear imperfection sensitivity on critical members.
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6. Perform local stress checks at ring hubs, propulsion booms and docking links.

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_3/v0_3_structural_report.json‎

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{
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"version": "0.3.0",
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"units": "mm-N-s for geometry/FEA; SI for human-readable dynamics",
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"node_count": 222,
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"element_count": 580,
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"x_station_count": 21,
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"primary_structure_estimated_mass_kg": 7742.281779256799,
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"ring_rotation_rpm": 4.3,
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"ring_acceleration_m_s2": 2.4331864716818967,
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"ring_acceleration_g": 0.24811596943725908,
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"ring_design_mass_each_kg": 12000.0,
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"ring_total_radial_force_each_N": 29198.23766018276,
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"ring_nodal_radial_force_N": 2433.186471681897,
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"ring_uniform_hoop_tension_N": 4647.043853190021,
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"ring_emergency_braking_torque_Nm": 6484.247237009333,
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"maximum_spine_bay_mm": 2500.0,
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"longeron_docking_load_each_N": 3125.0,
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"longeron_compressive_stress_MPa": 1.0765350587925822,
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"longeron_yield_factor_of_safety": 467.2397762541553,
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"longeron_euler_pinned_N": 975822.7192937268,
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"longeron_euler_fixed_pinned_N": 1991474.9373341366,
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"longeron_buckling_fos_pinned": 312.26327017399257,
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"mesh_faces": 18560,
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"mesh_vertices": 10440,
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"sections": {
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"1": {
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"name": "LONGERON",
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"od_mm": 160.0,
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"t_mm": 6.0,
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"id_mm": 148.0,
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"area_mm2": 2902.831611916969,
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"I_mm4": 8618507.05578148,
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"J_mm4": 17237014.11156296,
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"rg_mm": 54.488530903301104,
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"length_mm": 336000.0,
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"mass_kg": 2740.7374947075255
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},
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"2": {
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"name": "FRAME",
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"od_mm": 120.0,
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"t_mm": 5.0,
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"id_mm": 110.0,
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"area_mm2": 1806.415775814131,
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"I_mm4": 2991876.1286921543,
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"J_mm4": 5983752.257384309,
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"rg_mm": 40.697051490249265,
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"length_mm": 154297.9599296042,
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"mass_kg": 783.2208158696941
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},
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"3": {
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"name": "DIAGONAL",
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"od_mm": 90.0,
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"t_mm": 4.0,
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"id_mm": 82.0,
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"area_mm2": 1080.7078728348888,
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"I_mm4": 1001275.8441815245,
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"J_mm4": 2002551.688363049,
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"rg_mm": 30.438462510448847,
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"length_mm": 369395.43596018327,
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"mass_kg": 1121.7760418863636
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},
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"4": {
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"name": "RING_BEAM",
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"od_mm": 200.0,
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"t_mm": 6.0,
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"id_mm": 188.0,
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"area_mm2": 3656.813848778519,
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"I_mm4": 17219936.413898047,
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"J_mm4": 34439872.827796094,
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"rg_mm": 68.62215385719105,
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"length_mm": 149079.76997905195,
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"mass_kg": 1531.8910784842383
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},
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"5": {
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"name": "RING_SPOKE",
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"od_mm": 120.0,
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"t_mm": 5.0,
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"id_mm": 110.0,
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"area_mm2": 1806.415775814131,
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"I_mm4": 2991876.1286921543,
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"J_mm4": 5983752.257384309,
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"rg_mm": 40.697051490249265,
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"length_mm": 259200.0,
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"mass_kg": 1315.7065431457738
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},
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"6": {
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"name": "INTERFACE_BOOM",
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"od_mm": 140.0,
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"t_mm": 5.0,
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"id_mm": 130.0,
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"area_mm2": 2120.5750411731105,
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"I_mm4": 4837561.812676158,
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"J_mm4": 9675123.625352316,
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"rg_mm": 47.762432936356994,
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"length_mm": 32354.570747048398,
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"mass_kg": 192.79492949530993
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},
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"7": {
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"name": "DOCK_FRAME",
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"od_mm": 140.0,
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"t_mm": 5.0,
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"id_mm": 130.0,
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"area_mm2": 2120.5750411731105,
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"I_mm4": 4837561.812676158,
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"J_mm4": 9675123.625352316,
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"rg_mm": 47.762432936356994,
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"length_mm": 9423.831333867054,
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"mass_kg": 56.15487566789426
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}
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}
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}

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_3/v0_3_validation_output.txt‎

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PASS
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{
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"nodes": 222,
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"elements": 580,
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"sections": 7,
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"glb_geometries": 4,
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"glb_faces": 18560
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}
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No validation errors.

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