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‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_8/V0_8_optimization_report.md‎

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# ASTERION FCTA-1 — Version 0.8 Optimisation Report
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## Executive result
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The selected H3 configuration increases idealised tube-structure mass from 7742.3 kg to 10423.4 kg, an increase of 2681.4 kg. In exchange, the independent frame model predicts:
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- propulsion displacement reduction from 13.788 mm to 0.215 mm;
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- misaligned-docking displacement reduction from 52.823 mm to 22.870 mm;
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- first supported mode increase from 0.1308 Hz to 0.1964 Hz;
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- balanced ring-braking displacement of 1.846 mm; and
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- single-ring fault-braking displacement of 3.487 mm.
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## Why H3 was selected
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H3 is the lowest-mass tested candidate that meets the 25 mm docking criterion with useful margin while also satisfying the propulsion, braking, modal and mass targets. H4 improves docking displacement to about 20.2 mm but adds approximately 623 kg. H8 doubles ring-brace count, but docking response remains almost unchanged because docking flexibility is governed mainly by global spine depth.
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## Physical interpretation
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The propulsion improvement is large because the new longitudinal struts carry thrust axially instead of forcing the original in-plane booms to resist axial spacecraft load through bending. The docking improvement is governed by the 1.8 m spine radius, which increases global bending stiffness. Ring braking improves through triangulated torque paths and through the corrected counter-rotating load definition.
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## Caution
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The screening model may overpredict stiffness because all beam joints are ideal. The next authoritative ANSYS runs must include joint compliance, local shell models and sensitivity cases.

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_8/before_after_static_comparison.csv‎

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load_case_id,description,baseline_translation_mm,optimized_translation_mm,reduction_percent
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LC-STR-01,Docking compression,0.8095171570870019,0.6965874615230333,13.95025350300656
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LC-STR-02,Propulsion thrust,13.78765802894462,0.2148503461176776,98.44171979268242
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LC-STR-03,Ring centrifugal,0.1764051752731741,0.1460459836272048,17.209921193613642
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LC-STR-04,Sector imbalance,6.609803314527801,2.795165605791783,57.71181875187965
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LC-STR-06,Powered rotating,13.787671493973484,0.3031521335371046,97.80128113967893
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LC-STR-07,Misaligned docking,52.8225877180624,22.8695049967966,56.70506503986268

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_8/build_summary.json‎

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{
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"release": "0.8.0",
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"selected_design": "H3",
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"nodes": 222,
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"elements": 648,
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"structural_mass_kg": 10423.430670108912,
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"dry_docked_mass_kg": 53223.43067,
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"dry_docked_cg_x_m": 1.972815,
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"first_supported_mode_Hz": 0.1964088051840446,
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"propulsion_translation_mm": 0.2148503461176776,
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"misaligned_docking_mm": 22.8695049967966,
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"balanced_braking_mm": 1.8464527340647812,
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"single_ring_fault_mm": 3.486900488908973,
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"validation_status": "PASS"
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}

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_8/modal_comparison.csv‎

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metric,baseline_Hz,optimized_Hz,increase_percent
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First supported mode,0.130787401424204,0.1964088051840446,50.17410166824865

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_8/optimization_doe.csv‎

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design_id,spine_radius_mm,longeron_OD_mm,frame_OD_mm,diagonal_OD_mm,ring_brace_OD_mm,ring_brace_count,dock_spreader_count,structural_mass_kg,misaligned_docking_mm,propulsion_displacement_mm,balanced_brake_mm,single_ring_fault_mm,first_supported_mode_Hz,selected
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BASE,1200,160,120,90,0,0,0,7742.282,52.8226,13.7877,105.1473,105.1473,0.1308,False
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H1,1600,160,120,90,90,48,8,9999.564,28.9702,0.2631,2.5919,5.3863,0.194,False
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H2,1700,160,130,100,90,48,8,10335.888,25.5206,0.2376,2.125,4.1499,0.1953,False
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H3_SELECTED,1800,160,130,100,90,48,8,10423.431,22.8695,0.2149,1.8465,3.4869,0.1964,True
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H4,1800,180,140,110,90,48,8,11045.999,20.2174,0.1859,1.7414,3.1688,0.1973,False
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H5,1800,160,130,100,80,48,16,10121.044,22.7486,0.2151,2.2702,3.7694,0.1811,False
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H6,1800,160,130,100,90,48,8,10558.294,22.8443,0.2149,1.8465,3.4869,0.1964,False
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H7,1700,160,130,100,90,48,8,10470.89,25.4851,0.2376,2.125,4.1499,0.1953,False
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H8,1800,160,130,100,90,96,8,12037.88,22.8693,0.2142,1.2191,3.0687,0.2153,False

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_8/package_validation_output.txt‎

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{
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"status": "PASS",
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"errors": [],
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"nodes": 222,
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"elements": 648,
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"structural_mass_kg": 10423.430670108912,
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"first_mode_Hz": 0.1964088051840446
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}

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_8/screening_run.txt‎

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{
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"status": "screening_only",
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"solver": "custom linear 3-D Euler-Bernoulli frame",
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"nodes": 222,
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"elements": 648,
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"structural_tube_mass_kg": 10423.430670108912,
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"approximate_total_lumped_mass_kg": 53223.43067010891,
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"static_cases": [
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{
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"load_case_id": "LC-STR-01",
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"support_model": "aft_fixed",
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"result_source": "Independent Python Euler-Bernoulli frame screening",
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"max_translation_mm": 0.6965874615230333,
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"critical_node_id": 219,
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"max_screening_von_mises_MPa": 2.6707727047580945,
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"critical_element_id": 569,
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"minimum_yield_factor": 188.33500848046117,
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"minimum_member_euler_factor": 8.101620246518904
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},
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{
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"load_case_id": "LC-STR-02",
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"support_model": "aft_fixed",
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"result_source": "Independent Python Euler-Bernoulli frame screening",
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"max_translation_mm": 0.2148503461176776,
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"critical_node_id": 176,
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"max_screening_von_mises_MPa": 1.073615687592714,
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"critical_element_id": 75,
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"minimum_yield_factor": 468.5102926614627,
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"minimum_member_euler_factor": 184.48557719983637
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},
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{
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"load_case_id": "LC-STR-03",
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"support_model": "aft_fixed",
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"result_source": "Independent Python Euler-Bernoulli frame screening",
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"max_translation_mm": 0.14604598362720486,
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"critical_node_id": 174,
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"max_screening_von_mises_MPa": 2.7361626727971067,
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"critical_element_id": 505,
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"minimum_yield_factor": 183.83409912020926,
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"minimum_member_euler_factor": 11.815516372270194
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},
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{
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"load_case_id": "LC-STR-04",
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"support_model": "aft_fixed",
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"result_source": "Independent Python Euler-Bernoulli frame screening",
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"max_translation_mm": 2.795165605791783,
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"critical_node_id": 219,
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"max_screening_von_mises_MPa": 1.2835969915645227,
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"critical_element_id": 9,
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"minimum_yield_factor": 391.86754355579654,
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"minimum_member_euler_factor": 24.801469415115825
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},
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{
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"load_case_id": "LC-STR-06",
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"support_model": "aft_fixed",
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"result_source": "Independent Python Euler-Bernoulli frame screening",
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"max_translation_mm": 0.30315213353710463,
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"critical_node_id": 199,
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"max_screening_von_mises_MPa": 2.73810288048097,
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"critical_element_id": 529,
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"minimum_yield_factor": 183.70383508440122,
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"minimum_member_euler_factor": 11.641855199973389
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},
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{
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"load_case_id": "LC-STR-07",
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"support_model": "aft_fixed",
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"result_source": "Independent Python Euler-Bernoulli frame screening",
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"max_translation_mm": 22.8695049967966,
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"critical_node_id": 222,
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"max_screening_von_mises_MPa": 7.530079304234314,
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"critical_element_id": 9,
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"minimum_yield_factor": 66.79876528221331,
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"minimum_member_euler_factor": 7.9002920285570815
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},
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{
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"load_case_id": "LC-STR-08",
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"support_model": "aft_fixed",
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"result_source": "Independent Python Euler-Bernoulli frame screening",
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"max_translation_mm": 1.8464527340647814,
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"critical_node_id": 208,
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"max_screening_von_mises_MPa": 0.8750870212595403,
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"critical_element_id": 240,
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"minimum_yield_factor": 574.7999773508425,
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"minimum_member_euler_factor": 13.919623471075411
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},
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{
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"load_case_id": "LC-STR-09",
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"support_model": "aft_fixed",
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"result_source": "Independent Python Euler-Bernoulli frame screening",
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"max_translation_mm": 3.486900488908973,
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"critical_node_id": 181,
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"max_screening_von_mises_MPa": 0.6129629680606593,
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"critical_element_id": 22,
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"minimum_yield_factor": 820.6042227827093,
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"minimum_member_euler_factor": 20.873684415750933
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}
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],
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"supported_modal_frequencies_Hz": [
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0.1964088051840446,
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0.19644133264213973,
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0.2213052556499484,
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0.22133270851902045,
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0.22990069165409538,
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0.25877996892656085,
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0.30563870170112994,
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0.4011941565582085,
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0.4025482045274537,
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0.4029063455552414,
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0.44029449537109216,
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0.44660093940522827
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],
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"limitations": [
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"Ideal rigid beam joints",
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"No shear deformation or warping",
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"Simplified nearest-node placement for subsystem mass",
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"Approximate positive rotary lumped mass",
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"No contact, geometric nonlinearity, joint flexibility or imperfections",
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"ANSYS Mechanical results are required for final portfolio claims"
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]
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}

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_8/updated_cg_loading_cases.csv‎

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case_id,total_mass_kg,propellant_mass_kg,payload_mass_kg,cg_x_m,cg_y_m,cg_z_m
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DRY_DOCKED,53223.430670,0.000000,0.000000,1.972815,-0.000057,0.000057
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10_PERCENT_RESERVE,54423.430670,1200.000000,0.000000,1.730871,-0.000057,0.000057
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50_PERCENT_PROPELLANT,59223.430670,6000.000000,0.000000,0.861141,-0.000048,0.000048
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FULL_PROPELLANT,65223.430670,12000.000000,0.000000,-0.045998,-0.000048,0.000048
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FULL_PROPELLANT_PLUS_3000KG_PAYLOAD,68223.430670,12000.000000,3000.000000,0.659595,-0.000048,0.000048
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DRY_WITHOUT_SKIMMER,47723.430670,0.000000,0.000000,-0.738628,-0.000066,0.000066

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_8/updated_component_mass_properties.csv‎

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item_id,subsystem,description,mass_kg,x_m,y_m,z_m,maturity,source
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AST-MASS-001,Structure,V0.8 optimised primary beam structure,10423.430670108912,0.0,0.0,0.0,Class IV,V0.8 optimised beam-section estimate
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AST-MASS-120,Habitation,Ring 1 pressure and protection sector 1,300.0,-2.5,12.0,0.0,Class IV,Parametric allowance
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AST-MASS-121,Habitation,Ring 1 pressure and protection sector 2,300.0,-2.5,10.3923,6.0,Class IV,Parametric allowance
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AST-MASS-122,Habitation,Ring 1 pressure and protection sector 3,300.0,-2.5,6.0,10.3923,Class IV,Parametric allowance
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AST-MASS-123,Habitation,Ring 1 pressure and protection sector 4,300.0,-2.5,0.0,12.0,Class IV,Parametric allowance
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AST-MASS-124,Habitation,Ring 1 pressure and protection sector 5,300.0,-2.5,-6.0,10.3923,Class IV,Parametric allowance
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AST-MASS-125,Habitation,Ring 1 pressure and protection sector 6,300.0,-2.5,-10.3923,6.0,Class IV,Parametric allowance
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AST-MASS-126,Habitation,Ring 1 pressure and protection sector 7,300.0,-2.5,-12.0,0.0,Class IV,Parametric allowance
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AST-MASS-127,Habitation,Ring 1 pressure and protection sector 8,300.0,-2.5,-10.3923,-6.0,Class IV,Parametric allowance
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AST-MASS-128,Habitation,Ring 1 pressure and protection sector 9,300.0,-2.5,-6.0,-10.3923,Class IV,Parametric allowance
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AST-MASS-129,Habitation,Ring 1 pressure and protection sector 10,300.0,-2.5,-0.0,-12.0,Class IV,Parametric allowance
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AST-MASS-130,Habitation,Ring 1 pressure and protection sector 11,300.0,-2.5,6.0,-10.3923,Class IV,Parametric allowance
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AST-MASS-131,Habitation,Ring 1 pressure and protection sector 12,300.0,-2.5,10.3923,-6.0,Class IV,Parametric allowance
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AST-MASS-151,Ring mechanism,"Ring 1 bearing, drive and rotary interfaces",1800.0,-2.5,0.0,0.0,Class IV,Subsystem allowance
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AST-MASS-140,Habitation,Ring 2 pressure and protection sector 1,300.0,2.5,12.0,0.0,Class IV,Parametric allowance
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AST-MASS-141,Habitation,Ring 2 pressure and protection sector 2,300.0,2.5,10.3923,6.0,Class IV,Parametric allowance
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AST-MASS-142,Habitation,Ring 2 pressure and protection sector 3,300.0,2.5,6.0,10.3923,Class IV,Parametric allowance
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AST-MASS-143,Habitation,Ring 2 pressure and protection sector 4,300.0,2.5,0.0,12.0,Class IV,Parametric allowance
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AST-MASS-144,Habitation,Ring 2 pressure and protection sector 5,300.0,2.5,-6.0,10.3923,Class IV,Parametric allowance
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AST-MASS-145,Habitation,Ring 2 pressure and protection sector 6,300.0,2.5,-10.3923,6.0,Class IV,Parametric allowance
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AST-MASS-146,Habitation,Ring 2 pressure and protection sector 7,300.0,2.5,-12.0,0.0,Class IV,Parametric allowance
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AST-MASS-147,Habitation,Ring 2 pressure and protection sector 8,300.0,2.5,-10.3923,-6.0,Class IV,Parametric allowance
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AST-MASS-148,Habitation,Ring 2 pressure and protection sector 9,300.0,2.5,-6.0,-10.3923,Class IV,Parametric allowance
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AST-MASS-149,Habitation,Ring 2 pressure and protection sector 10,300.0,2.5,-0.0,-12.0,Class IV,Parametric allowance
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AST-MASS-150,Habitation,Ring 2 pressure and protection sector 11,300.0,2.5,6.0,-10.3923,Class IV,Parametric allowance
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AST-MASS-151,Habitation,Ring 2 pressure and protection sector 12,300.0,2.5,10.3923,-6.0,Class IV,Parametric allowance
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AST-MASS-152,Ring mechanism,"Ring 2 bearing, drive and rotary interfaces",1800.0,2.5,0.0,0.0,Class IV,Subsystem allowance
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AST-MASS-200,Command,Command and navigation module,2400.0,12.0,0.0,0.0,Class IV,Subsystem allowance
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AST-MASS-201,Service,Service and environmental-control module,3000.0,-10.0,0.0,0.0,Class IV,Subsystem allowance
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AST-MASS-202,Radiation refuge,Water-shielded storm refuge,2200.0,7.0,0.0,0.0,Class IV,Subsystem allowance
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AST-MASS-203,Logistics,Logistics and spares module,1800.0,16.0,0.0,0.0,Class IV,Subsystem allowance
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AST-MASS-204,Docking,Forward docking assembly,750.0,21.4,0.0,0.0,Class IV,Subsystem allowance
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AST-MASS-221,Power,Deployable solar wing 1,900.0,3.0,15.1,0.0,Class IV,Wing mass allowance
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AST-MASS-222,Power,Deployable solar wing 2,900.0,3.0,-15.1,0.0,Class IV,Wing mass allowance
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AST-MASS-223,Power,Deployable solar wing 3,900.0,3.0,0.0,15.1,Class IV,Wing mass allowance
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AST-MASS-224,Power,Deployable solar wing 4,900.0,3.0,0.0,-15.1,Class IV,Wing mass allowance
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AST-MASS-230,Thermal,Deployable radiator panel 1,300.0,-3.0,6.9282,4.0,Class IV,Panel and boom allowance
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AST-MASS-231,Thermal,Deployable radiator panel 2,300.0,-3.0,0.0,8.0,Class IV,Panel and boom allowance
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AST-MASS-232,Thermal,Deployable radiator panel 3,300.0,-3.0,-6.9282,4.0,Class IV,Panel and boom allowance
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AST-MASS-233,Thermal,Deployable radiator panel 4,300.0,-3.0,-6.9282,-4.0,Class IV,Panel and boom allowance
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AST-MASS-234,Thermal,Deployable radiator panel 5,300.0,-3.0,-0.0,-8.0,Class IV,Panel and boom allowance
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AST-MASS-235,Thermal,Deployable radiator panel 6,300.0,-3.0,6.9282,-4.0,Class IV,Panel and boom allowance
44+
AST-MASS-240,Propulsion,Electric propulsion pod 1,1000.0,-16.0,4.8,0.0,Class IV,Pod dry-mass allowance
45+
AST-MASS-241,Propulsion,Electric propulsion pod 2,1000.0,-16.0,2.4,4.1569,Class IV,Pod dry-mass allowance
46+
AST-MASS-242,Propulsion,Electric propulsion pod 3,1000.0,-16.0,-2.4,4.1569,Class IV,Pod dry-mass allowance
47+
AST-MASS-243,Propulsion,Electric propulsion pod 4,1000.0,-16.0,-4.8,0.0,Class IV,Pod dry-mass allowance
48+
AST-MASS-244,Propulsion,Electric propulsion pod 5,1000.0,-16.0,-2.4,-4.1569,Class IV,Pod dry-mass allowance
49+
AST-MASS-245,Propulsion,Electric propulsion pod 6,1000.0,-16.0,2.4,-4.1569,Class IV,Pod dry-mass allowance
50+
AST-MASS-250,Propellant storage,Propellant tank 1 dry hardware,650.0,-9.0,1.2021,1.2021,Class IV,Tank dry-mass allowance
51+
AST-MASS-251,Propellant storage,Propellant tank 2 dry hardware,650.0,-9.0,-1.2021,1.2021,Class IV,Tank dry-mass allowance
52+
AST-MASS-252,Propellant storage,Propellant tank 3 dry hardware,650.0,-9.0,-1.2021,-1.2021,Class IV,Tank dry-mass allowance
53+
AST-MASS-253,Propellant storage,Propellant tank 4 dry hardware,650.0,-9.0,1.2021,-1.2021,Class IV,Tank dry-mass allowance
54+
AST-MASS-260,RCS,Reaction-control pod 1,175.0,8.0,2.2,0.0,Class IV,RCS allowance
55+
AST-MASS-261,RCS,Reaction-control pod 2,175.0,8.0,0.0,2.2,Class IV,RCS allowance
56+
AST-MASS-262,RCS,Reaction-control pod 3,175.0,8.0,-2.2,0.0,Class IV,RCS allowance
57+
AST-MASS-263,RCS,Reaction-control pod 4,175.0,8.0,-0.0,-2.2,Class IV,RCS allowance
58+
AST-MASS-270,Robotics,Robotic servicing arm,450.0,18.0,2.5,1.5,Class IV,Arm allowance
59+
AST-MASS-271,Aeroshuttle,Docked Skimmer aeroshuttle,5500.0,25.5,0.0,0.0,Class IV,Concept dry-mass allowance
60+
AST-MASS-272,Avionics,"Distributed avionics, harness and data equipment",1200.0,5.0,-0.94,-0.56,Class IV,Balance allowance

‎downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/calculations/v0_8/updated_mass_budget_by_subsystem.csv‎

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subsystem,dry_mass_kg,fraction_percent
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Structure,10423.431,19.584
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Habitation,7200.000,13.528
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Propulsion,6000.000,11.273
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Aeroshuttle,5500.000,10.334
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Power,3600.000,6.764
7+
Ring mechanism,3600.000,6.764
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Service,3000.000,5.637
9+
Propellant storage,2600.000,4.885
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Command,2400.000,4.509
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Radiation refuge,2200.000,4.134
12+
Logistics,1800.000,3.382
13+
Thermal,1800.000,3.382
14+
Avionics,1200.000,2.255
15+
Docking,750.000,1.409
16+
RCS,700.000,1.315
17+
Robotics,450.000,0.845
18+
TOTAL,53223.431,100.000

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