{
  "dataset": "t4_structural_dynamics_v1",
  "seed": 20260927,
  "configuration_count": 128,
  "trajectories_per_configuration": 4,
  "split_configuration_counts": {
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    "validation": 16,
    "test": 16
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  "test_protocol_counts": {
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    "parameter_ood": 4,
    "excitation_ood": 4
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    "agentfem_commit": "882de08b9672ec96b6e7a6799bcce1155d8e01f0",
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    "cell_type": "quadrilateral",
    "displacement_degree": 2,
    "assumption": "plane_stress"
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  "fixed_material": {
    "name": "aluminum_like_isotropic_elastic",
    "poisson": 0.33
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  "interior_parameter_ranges": {
    "length_m": [0.85, 1.15],
    "height_m": [0.04, 0.06],
    "young_pa": [62000000000.0, 78000000000.0],
    "density_kg_m3": [2550.0, 2850.0],
    "damping_ratio": [0.0075, 0.025],
    "traction_amplitude_pa": [750.0, 4500.0]
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    "height_m": [0.035, 0.065],
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    "density_kg_m3": [2500.0, 2900.0],
    "damping_ratio": [0.005, 0.03],
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    "duration_s": 0.5,
    "dt_s": 0.000125,
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    "rayleigh_anchor_modes": [1, 2]
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  "quality": {
    "maximum_first_frequency_analytical_relative_error": 0.015,
    "maximum_energy_balance_relative_residual": 0.02,
    "maximum_time_refinement_relative_l2": 0.03,
    "time_refinement_dt_s": 0.0000625,
    "time_refinement_configuration_ids": [0, 31, 63, 95, 111, 119, 123, 127]
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    "formal_shard_configuration_count": 16,
    "native_field_representatives": [0, 119, 124, 127]
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}