{
  "physical_measurements": 0,
  "shaft_peak_torque_Nm_screen": 62.5,
  "basis": "150 Nm motor peak shared across three shafts with 25% imbalance allowance. Twenty-millimetre shafts replace the earlier 17 mm sizing study within the same 80 kg assembly budget.",
  "classification": "PRELIMINARY_COMPONENT_SIZING_SCREEN",
  "nominal_modes": {
    "mode_rpm_equivalent": [
      19590.135021421753,
      21429.831398353013,
      32753.69315362513,
      39571.66620970729,
      41934.19943880559,
      49739.913210094004
    ],
    "support_positions_m": [
      -0.065,
      0.0,
      0.014,
      0.245,
      0.49,
      0.64
    ],
    "disk_positions_m": [
      0.04,
      0.122,
      0.20400000000000001,
      0.286,
      0.368,
      0.45,
      0.532
    ],
    "shaft_diameter_m": 0.02,
    "E_Pa": 190000000000.0,
    "density_kg_m3": 8000.0,
    "disk_mass_factor": 1.0,
    "support_radial_stiffness_N_m": 10000000.0
  },
  "softer_support_and_25pct_rotor_mass_case": {
    "mode_rpm_equivalent": [
      14097.63196978428,
      16241.407028219688,
      24415.208750034642,
      29502.097708341422,
      34078.02177880854,
      39059.70562780675
    ],
    "support_positions_m": [
      -0.065,
      0.0,
      0.014,
      0.245,
      0.49,
      0.64
    ],
    "disk_positions_m": [
      0.04,
      0.122,
      0.20400000000000001,
      0.286,
      0.368,
      0.45,
      0.532
    ],
    "shaft_diameter_m": 0.02,
    "E_Pa": 180000000000.0,
    "density_kg_m3": 8000.0,
    "disk_mass_factor": 1.25,
    "support_radial_stiffness_N_m": 5000000.0
  },
  "lowest_mode_speed_ratio_to_6700rpm": 2.1041241745946686,
  "belt_radial_force_N_screen": 3125.0,
  "drive_bending_stress_Pa": 64656695.63108247,
  "shaft_torsional_stress_Pa": 39788735.77297383,
  "combined_von_mises_Pa": 94498247.46081284,
  "stress_acceptance_requirement_Pa": 100000000.0,
  "three_shaft_mass_kg": 6.031857894892404,
  "bearing_support_mass_budget_kg": 4.92,
  "remaining_80kg_assembly_margin_kg": 6.538739520713173,
  "bearing_reference": {
    "url": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "authored_by": "SKF",
    "dimensions_mm": [
      20,
      47,
      14
    ],
    "mass_kg": 0.11,
    "limiting_rpm": 18000,
    "basic_dynamic_rating_N": 13300,
    "basic_static_rating_N": 7650,
    "scope": "Sizing envelope only. An appropriate matched locating pair, floating radial supports, preload, lubricant and life calculation remain to be selected."
  },
  "material_reference": {
    "url": "https://www.atimaterials.com/Products/Documents/datasheets/stainless-specialty-steel/precipitationhardening/ati_17-4_tds_en_v2.pdf",
    "direction": "Precipitation-hardened 17-4 shaft stock; heat treatment and properties must be specified. Calculations use conservative E/density requirements rather than a strength guarantee."
  },
  "layout_notes": [
    "One opposed locating pair at 0 and 14 mm per shaft.",
    "Radial supports at -65, 245, 490 and 640 mm permit the specified thermal axial float.",
    "The belt pulley is bracketed by supports.",
    "A 40 K differential over 640 mm requires about 0.28 mm axial float at the assumed 11e-6 / K expansion coefficient."
  ],
  "limits": [
    "No gyroscopic Campbell diagram, critical-speed passage response, damping, housing modes, bearing life, imbalance, blade fatigue or burst-containment qualification.",
    "The bearing radial stiffness, 100 MPa allowable and rotor masses are component acceptance requirements.",
    "Added supports must meet the pressure-flow and loss targets in the actual blower."
  ],
  "checks": {
    "mode_separation_above_1p5": true,
    "stress_below_100MPa": true,
    "assembly_mass_margin_above_5kg": true
  }
}