{
  "title": "Automotive Underbody Panel Impact Dataset",
  "version": "1.1.1",
  "release_status": "public-release",
  "resource_type": "dataset",
  "total_cases": 1500,
  "geometries": [
    "floorfrontdriver",
    "floorfrontR",
    "trunkfloor"
  ],
  "cases_per_geometry": 500,
  "states_per_case": 17,
  "split": {
    "seed": 12345,
    "train": 400,
    "validation": 50,
    "test": 50,
    "note": "same case-ID lists, independent simulations per geometry"
  },
  "fields": {
    "inputs": [
      "fixed finite-element mesh",
      "impact_xyz",
      "velocity_xyz",
      "mass_ratio",
      "material_young_mpa",
      "material_poisson"
    ],
    "outputs": [
      "17-state nodal 3D displacement",
      "17-state shell von Mises effective stress, maximized over through-thickness integration points"
    ]
  },
  "units": {
    "status": "SPECIFIED",
    "system": "tonne-mm-s-N",
    "coordinate": "mm",
    "displacement": "mm",
    "time": "s",
    "velocity": "mm/s",
    "effective_stress": "MPa",
    "young_modulus": "MPa",
    "impactor_mass": "tonne",
    "impactor_density": "tonne/mm^3",
    "mass_ratio": "dimensionless",
    "theta_phi": "degree"
  },
  "license": "MIT",
  "doi": null,
  "creators": [
    "Anonymous Authors"
  ],
  "source_model": {
    "name": "2020 Nissan Rogue finite-element model",
    "developer": "CCSA, George Mason University",
    "sponsor": "NHTSA",
    "exact_version": "Version 3, released August 2024",
    "official_page": "https://www.ccsa.gmu.edu/models/2020-nissan-rogue/"
  },
  "geometry_metadata": {
    "floorfrontdriver": "floorfrontdriver_geometry.json",
    "floorfrontR": "floorfrontR_geometry.json",
    "trunkfloor": "trunkfloor_geometry.json"
  },
  "simulation": {
    "solver": "LS-DYNA SMP single precision R12 via ANSYS v221 lsdyna_sp.exe",
    "exact_r12_subbuild_retained_for_every_case": false,
    "ncpu": 8,
    "memory": "400m",
    "termination_time_s": 0.03,
    "d3plot_nominal_interval_s": 0.0002,
    "gravity_global_z_mm_per_s2": 9810.0,
    "boundary_condition": "topological outer-boundary nodes fixed in all six degrees of freedom",
    "contact": "CONTACT_AUTOMATIC_SURFACE_TO_SURFACE_ID",
    "static_friction": 0.15,
    "dynamic_friction": 0.15
  },
  "impactor": {
    "type": "rigid spherical shell",
    "part_id": 9636,
    "section_id": 9636,
    "material_id": 174,
    "material_model": "MAT_RIGID",
    "radius_mm": 12.5,
    "initial_gap_mm": 5.0,
    "elform": 2,
    "shrf": 0.833333,
    "nip": 3,
    "shell_thickness_mm": 0.1,
    "reference_nominal_mass_tonne": 0.01,
    "reference_density_tonne_per_mm3": 5.205e-05,
    "mass_scaling": "impactor_mass = reference_nominal_mass_tonne * mass_ratio",
    "density_scaling": "impactor_density = reference_density_tonne_per_mm3 * mass_ratio"
  },
  "design": {
    "method": "seven-dimensional constrained Latin hypercube with maximin selection over 128 trials",
    "dimensions": ["position_x", "position_y", "impact_speed", "mass_ratio", "theta", "phi", "material_class"],
    "impact_speed_mm_per_s": [1732.05, 5196.15],
    "mass_ratio": [0.75, 1.25],
    "theta_deg": [0.0, 15.0],
    "phi_deg": [0.0, 360.0],
    "minimum_boundary_distance_mm": 80.0,
    "seeds": {
      "floorfrontR": 20260728,
      "trunkfloor": 20260723,
      "floorfrontdriver_initial": 20260721,
      "floorfrontdriver_extensions": 20260722
    }
  },
  "temporal_sampling": {
    "raw_nominal_interval_s": 0.0002,
    "compact_stride": 10,
    "append_final_state": true,
    "retained_indices": [0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 151],
    "peak_time_definition": "discrete argmax of valid-node displacement magnitude over retained states"
  }
}