{
  "schema_version": 1,
  "review_date": "2026-10-04",
  "document_kind": "Published source data for research examples",
  "title": "Multi-objective optimization of spherical roller bearings based on fatigue and wear using evolutionary algorithm",
  "authors": "Ashish Jat; Rajiv Tiwari",
  "year": "2018 online / 2020 volume",
  "source_url": "https://doi.org/10.1016/j.jksues.2018.03.002",
  "review_scope": "Tables 2–9 and Section 5: operating constants, standard envelopes, optimized internal geometry and capacity/film-thickness targets; previously cited in the gearless-drive geometry study",
  "readiness": "Published source-data research example; native comparison pending",
  "remaining_inputs": [
    "Verified spherical-roller and EHL models",
    "Use one complete optimization-table row and its matching operating conditions",
    "Reconcile source Q=0.25Cd and speed/viscosity conventions",
    "Do not transfer optimized dimensions to SKF 230/900 or treat film thickness as measured wear life"
  ],
  "paper_id": "P019",
  "filename": "jat-tiwari-source-cases.json",
  "website_anchor": "jat-spherical-design",
  "source_location": "Tables 2-9 and Section 5; standard envelope from Table 5",
  "native_input_available": false,
  "standard_envelope_case": {
    "designation": "22317",
    "bore_mm": 85,
    "outside_diameter_mm": 180,
    "width_mm": 60,
    "speed_rpm": 900,
    "source_dynamic_capacity_kn": 399.3
  },
  "source_operating_constants": {
    "youngs_modulus_mpa": 210000,
    "poisson_ratio": 0.3,
    "row_count": 2,
    "source_normal_load_definition": "Q=0.25*Cd; audit load convention before treating it as a radial bearing resultant",
    "source_viscosity_mpa_s": 1.62e-09,
    "pressure_viscosity_coefficient_per_pa": 1.75e-08
  },
  "optimization_variables": [
    "pitch diameter",
    "roller diameter",
    "roller count",
    "effective roller length",
    "contact angle"
  ],
  "targets": [
    "numerical dynamic capacity",
    "minimum lubricant film thickness"
  ],
  "comparison_boundary": "Select one complete optimized row with its matching operating conditions. These are numerical designs, not measured manufacturer internals or experimental wear life. They do not establish SKF 230/900 geometry."
}