{
  "schema_version": 1,
  "review_date": "2026-10-04",
  "document_kind": "Published source data for research examples",
  "title": "Experimental Study on the Skidding Damage of a Cylindrical Roller Bearing",
  "authors": "Qing Zhang; Jun Luo; Xiang-yu Xie; Jin Xu; Zhen-huan Ye",
  "year": "2020",
  "source_url": "https://www.mdpi.com/1996-1944/13/18/4075",
  "review_scope": "Publisher/PMC indexed experiment description, structural parameters and Figures 3–6 operating conditions; publisher PDF endpoint returned HTTP 403, so no PDF archived",
  "readiness": "Published source-data research example; native comparison pending",
  "remaining_inputs": [
    "Complete geometry, lubricant properties and fixture audit",
    "Calibrated transient cage/traction/thermal model",
    "Treat measured skid damage onset separately from ideal cage kinematics and fatigue life"
  ],
  "paper_id": "P018",
  "filename": "zhang2020-source-cases.json",
  "website_anchor": "zhang-skidding",
  "source_location": "Indexed primary experiment descriptions, structural parameters and Figures 3-6; complete full-paper audit pending",
  "native_input_available": false,
  "partial_geometry": {
    "roller_count": 30,
    "roller_diameter_mm": 12
  },
  "reviewed_operating_conditions": [
    {
      "source_figure": "Figure 3",
      "radial_load_kn": 0.2,
      "oil_delivery_l_per_min": 2.166,
      "acceleration_rpm_per_hour": 360000
    },
    {
      "source_figure": "Figure 4",
      "radial_load_kn": 1.0,
      "oil_delivery_l_per_min": 4.332,
      "acceleration_rpm_per_hour": 360000
    }
  ],
  "measured_quantities": [
    "friction torque",
    "temperature",
    "vibration/acceleration",
    "skid-damage onset speed"
  ],
  "comparison_boundary": "Complete bearing geometry, lubricant properties, fixture and measurement definitions still require source audit. No numerical critical-speed target is supplied in this record. A calibrated transient cage/traction/thermal model is required; ideal cage kinematics do not reproduce skid damage."
}