{
  "schema_version": 1,
  "review_date": "2026-10-04",
  "document_kind": "Published source data for research examples",
  "title": "Numerical simulation and experimental testing of dynamic stiffness of angular contact ball bearing",
  "authors": "Haitao Luo; Jia Fu; Changshuai Yu; Guangming Liu; Wei Wang; Peng Wang",
  "year": "2018",
  "source_url": "https://journals.sagepub.com/doi/full/10.1177/1687814018798973",
  "review_scope": "Publisher full-text Table 1, FE conditions, experimental fixture and Tables 3–4; PDF endpoint returned HTTP 403",
  "readiness": "Published source-data research example; native comparison pending",
  "remaining_inputs": [
    "Groove geometry and actual preload constraint",
    "Ball/ring elastic constants differ and must remain separate",
    "Reconcile printed 10^6 N/mm stiffness units and force/displacement definitions",
    "Reproduce fixture and shaft-dynamic corrections; do not equate measured equivalent dynamic stiffness with static dF/dδ"
  ],
  "paper_id": "P017",
  "filename": "luo2018-source-cases.json",
  "website_anchor": "luo-dynamic-stiffness",
  "source_location": "Table 1; FE model conditions; experimental Tables 3-4",
  "native_input_available": false,
  "geometry": {
    "designation": "NSK 60TAC120B",
    "bore_mm": 60,
    "outside_diameter_mm": 120,
    "pitch_diameter_mm": 93,
    "ball_count": 20,
    "ball_diameter_mm": 10,
    "contact_angle_degrees": 60
  },
  "ring_material": {
    "youngs_modulus_gpa": 206,
    "poisson_ratio": 0.3,
    "density_kg_per_m3": 7850
  },
  "ball_material": {
    "youngs_modulus_gpa": 320,
    "poisson_ratio": 0.25,
    "density_kg_per_m3": 3200
  },
  "separate_fe_case": {
    "preload_n": 2000,
    "radial_load_n": 1500,
    "inner_ring_speed_rpm": 3000
  },
  "experimental_speed_sweep": {
    "preload_n": 1500,
    "speed_rpm": [
      400,
      800,
      1200,
      1600,
      2000,
      2400
    ],
    "loading_stiffness_as_printed": [
      5.5,
      10.3,
      13.7,
      16.5,
      17.6,
      21.1
    ],
    "unloading_stiffness_as_printed": [
      5.1,
      9.6,
      13.2,
      16.5,
      18.3,
      20.8
    ]
  },
  "experimental_preload_sweep": {
    "speed_rpm": 1200,
    "preload_n": [
      0,
      500,
      1000,
      1500,
      2000,
      2500
    ],
    "loading_stiffness_as_printed": [
      7.2,
      10.4,
      12.3,
      13.7,
      15.2,
      16.6
    ],
    "unloading_stiffness_as_printed": [
      6.9,
      10.0,
      11.9,
      13.0,
      15.4,
      16.7
    ]
  },
  "printed_stiffness_units": "10^6 N/mm; units and force/displacement definitions require reconciliation before numerical use",
  "stiffness_units_verified": false,
  "comparison_boundary": "Do not merge FE and experiment operating conditions. Recover groove geometry and actual preload constraint; retain different ball/ring materials and experimental fixture/shaft corrections. Equivalent dynamic stiffness is distinct from static dF/dx."
}