[
  {
    "title": "Internal Loading Distribution in Statically Loaded Ball Bearings Subjected to an Eccentric Thrust Load",
    "authors": "Mário César Ricci",
    "year": "2009",
    "source_url": "https://doi.org/10.1155/2009/471804",
    "summary": "218 angular-contact bearing; 16 balls; 17800 N thrust; axial deflection, contact angle, normal loads and increasing moment. Centered-thrust subset independently audited.",
    "readiness": "centered-thrust comparison audited",
    "input_filename": "ricci-centered-thrust-17800.bearing"
  },
  {
    "title": "On Calculation Methods and Results for Straight Cylindrical Roller Bearing Deflection, Stiffness, and Stress",
    "authors": "Timothy L. Krantz",
    "year": "2011",
    "source_url": "https://ntrs.nasa.gov/citations/20150018925",
    "summary": "13 straight rollers; 7.5 mm diameter; 8.6 mm length; 39 mm pitch; zero clearance. Imposed 0.010 mm displacement and method-specific force, contact pressure and stiffness targets.",
    "readiness": "comparison pending"
  },
  {
    "title": "Static Load Distribution in Ball Bearings Including the Effects of Temperature and Fit",
    "authors": "M. Ricci",
    "year": "2010",
    "source_url": "https://doi.org/10.2495/TD100191",
    "summary": "218 bearing on hollow steel shaft in titanium housing; unfitted, fitted and hot cases. Internal geometry and exact fit/material/thermal inputs require supporting-source audit.",
    "readiness": "comparison pending"
  },
  {
    "title": "Modeling and Dynamic Analysis of Spherical Roller Bearing with Localized Defects: Analytical Formulation to Calculate Defect Depth and Stiffness",
    "authors": "Behnam Ghalamchi; Jussi Sopanen; Aki Mikkola",
    "year": "2016",
    "source_url": "https://doi.org/10.1155/2016/2106810",
    "summary": "22216-EK: two rows of 21 rollers, published internal geometry, defect cases and experimental frequency comparisons. Spherical-roller/transient solver extension required.",
    "readiness": "comparison pending"
  },
  {
    "title": "Modeling and Mechanical Characteristics Analysis of Matched Angular Contact Ball Bearings under Combined Loads",
    "authors": "Jianguo Gu; Junyan Yang; Shengdong Zhang; Shihui You; Xiaolin Shi",
    "year": "2022",
    "source_url": "https://journals.sagepub.com/doi/10.1177/16878132221132951",
    "summary": "NSK7206B pairs, DB/DF arrangements, preload and combined loads; internal geometry in Table 3 and numerical stiffness comparison in Table 2. Requires verified bearing-pair model.",
    "readiness": "comparison pending; publisher link"
  },
  {
    "title": "A discrete calculation method for radial load distribution integral of radial bearings",
    "authors": "Yu Hou; Yi Yin; Xi Wang",
    "year": "2024",
    "source_url": "https://journals.sagepub.com/doi/10.1177/16878132241275608",
    "summary": "6209 ball bearing and NU209 roller examples at 1000, 5000 and 10000 N with positive and negative clearance. Explicit ball-load tables; strongest next load-distribution candidate.",
    "readiness": "Runnable static ball-contact comparison; source model differences retained",
    "remaining_inputs": [
      "Exact constitutive/elliptic matching for each contact",
      "Preserve negative-table force residuals",
      "Complete NU209 roller geometry"
    ],
    "review_scope": "Publisher full-text assumptions and Tables 1–5; independent force projection of the rounded corrected-integral ball loads; PDF endpoint returned HTTP 403",
    "native_input_available": true,
    "source_data_filename": "hou2024-source-cases.json",
    "website_anchor": "hou-clearance",
    "native_input_filenames": [
      "hou2024-positive-1000.bearing",
      "hou2024-positive-5000.bearing",
      "hou2024-positive-10000.bearing",
      "hou2024-negative-1000.bearing",
      "hou2024-negative-5000.bearing",
      "hou2024-negative-10000.bearing"
    ],
    "comparison_filename": "radial-clearance-comparison.json"
  },
  {
    "title": "Effect of Internal Clearance on Load Distribution and Life of Radially Loaded Ball and Roller Bearings",
    "authors": "Fred B. Oswald; Erwin V. Zaretsky; Joseph V. Poplawski",
    "year": "2012",
    "source_url": "https://ntrs.nasa.gov/citations/20120008398",
    "summary": "Explicit 210-size worked cases: ten-ball bearing at 627 N with 0.0145 mm clearance, and fourteen-roller bearing at 6940 N with 0.045 mm clearance. Geometry, steel constants, approximate Stribeck factors and life-factor correlations.",
    "readiness": "Runnable static ball-contact comparison; source model differences retained",
    "remaining_inputs": [
      "Distinguish Appendix D approximation from the separate analysis-code result",
      "Preserve crowned-roller effective-length and stiffness conventions",
      "Reconcile printed arithmetic/unit inconsistencies before exact reproduction",
      "Audit life definition independently of contact agreement"
    ],
    "review_scope": "NASA/TM-2012-217115, Tables II–V, Appendix D worked examples printed pp.27–28 / PDF pp.31–32; Appendix F fitted life factors",
    "native_input_available": true,
    "source_data_filename": "nasa2012-source-cases.json",
    "website_anchor": "nasa-clearance",
    "native_input_filenames": [
      "nasa2012-ball-clearance-627.bearing"
    ],
    "comparison_filename": "radial-clearance-comparison.json"
  },
  {
    "title": "A numerical finite-element method for radial bearing stiffness estimation based on load dependent meshing",
    "authors": "Alberto Gabrielli; Mattia Battarra; Emiliano Mucchi",
    "year": "2022",
    "source_url": "https://past.isma-isaac.be/downloads/isma2022/proceedings/Contribution_183_proceeding_3.pdf",
    "summary": "NU202 ECP and 6210 internal dimensions and steel properties; numerical contact coefficients, mesh convergence, radial stiffness and 0.04 mm clearance. Separates contact-law coefficients from whole-bearing tangent stiffness.",
    "readiness": "source reviewed; comparison pending",
    "remaining_inputs": [
      "Exact FE mounting/contact/cage boundaries for whole-bearing curves",
      "Select contact-law versus whole-bearing tangent target",
      "Digitize graph targets with uncertainty where no numeric table is supplied"
    ],
    "review_scope": "ISMA 2022 pp.1527–1541; Table 1 and Section 2.1, contact-coefficient Tables 4–7, whole-bearing Sections 3–4 and clearance study",
    "native_input_available": false,
    "source_data_filename": "gabrielli2022-source-cases.json",
    "website_anchor": "gabrielli-stiffness"
  },
  {
    "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",
    "summary": "NSK 60TAC120B: 20 balls, 10 mm ball diameter, 93 mm pitch, 60-degree angle; different ball and ring materials. Experiments vary speed/preload and loading/unloading.",
    "readiness": "source reviewed; comparison pending; publisher link",
    "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"
    ],
    "review_scope": "Publisher full-text Table 1, FE conditions, experimental fixture and Tables 3–4; PDF endpoint returned HTTP 403",
    "native_input_available": false,
    "source_data_filename": "luo2018-source-cases.json",
    "website_anchor": "luo-dynamic-stiffness"
  },
  {
    "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",
    "summary": "Thirty-roller high-speed experiment monitors torque, acceleration and temperature at skid onset; radial load, oil delivery and acceleration conditions are stated. Useful for future cage/traction/thermal behavior.",
    "readiness": "source reviewed; comparison pending; publisher link",
    "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"
    ],
    "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",
    "native_input_available": false,
    "source_data_filename": "zhang2020-source-cases.json",
    "website_anchor": "zhang-skidding"
  },
  {
    "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",
    "summary": "Spherical-roller design cases include 22317 and larger bearings, with optimized pitch, roller diameter/count/length and angle. Capacity versus film-thickness tradeoffs are numerical design results, not measured manufacturer internals.",
    "readiness": "source reviewed; 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"
    ],
    "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",
    "native_input_available": false,
    "source_data_filename": "jat-tiwari-source-cases.json",
    "website_anchor": "jat-spherical-design"
  }
]