{
  "meta": {
    "version": "2.0",
    "created": "2026-03-04T12:00:00Z",
    "modified": "2026-03-04T12:00:00Z",
    "created_by": "mario",
    "modified_by": "mario",
    "study_name": "03_robustness",
    "description": "Robustness checks: one-soft-point tests, combined compliance, and correlated displacement patterns. Run AFTER Studies 01 and 02 — uses knee values from Study 02.",
    "tags": ["mirror", "zernike", "robustness", "frame-stiffness"]
  },
  "model": {
    "sim": {
      "path": "ASSY_M1_assyfem1_sim1.sim",
      "solver": "nastran",
      "_note": "Uses same CBUSH model variant as Study 02"
    },
    "nx_settings": {
      "nx_install_path": "C:\\Program Files\\Siemens\\DesigncenterNX2512",
      "simulation_timeout_s": 600
    }
  },
  "design_variables": [
    {
      "id": "dv_001",
      "name": "K_V_top",
      "expression_name": "K_V_top",
      "type": "continuous",
      "bounds": {"min": 1e4, "max": 1e12},
      "baseline": 1e12,
      "units": "N/m",
      "enabled": true,
      "description": "Stiffness for V_top CBUSH only (for one-soft-point tests)"
    },
    {
      "id": "dv_002",
      "name": "K_V_side",
      "expression_name": "K_V_side",
      "type": "continuous",
      "bounds": {"min": 1e4, "max": 1e12},
      "baseline": 1e12,
      "units": "N/m",
      "enabled": true,
      "description": "Stiffness for V_left + V_right CBUSHes (symmetric pair)"
    },
    {
      "id": "dv_003",
      "name": "K_L_side",
      "expression_name": "K_L_side",
      "type": "continuous",
      "bounds": {"min": 1e4, "max": 1e12},
      "baseline": 1e12,
      "units": "N/m",
      "enabled": true,
      "description": "Stiffness for L_left + L_right CBUSHes (symmetric pair)"
    }
  ],
  "extractors": [
    {
      "id": "ext_001",
      "name": "Zernike Annular OPD — Robustness",
      "type": "zernike_opd",
      "builtin": true,
      "config": {
        "inner_radius_mm": 135.75,
        "outer_radius_mm": 500.0,
        "n_modes": 50,
        "filter_low_orders": 4,
        "displacement_unit": "mm",
        "reference_subcase": 2
      },
      "outputs": [
        {
          "name": "rel_filtered_rms_40_vs_20",
          "metric": "filtered_rms_nm"
        },
        {
          "name": "rel_filtered_rms_60_vs_20",
          "metric": "filtered_rms_nm"
        }
      ]
    }
  ],
  "objectives": [
    {
      "id": "obj_001",
      "name": "ΔWFE at 60° — robustness tracking",
      "direction": "minimize",
      "weight": 1.0,
      "source": {
        "extractor_id": "ext_001",
        "output_name": "rel_filtered_rms_60_vs_20"
      },
      "target": 1.0,
      "units": "nm"
    }
  ],
  "constraints": [],
  "optimization": {
    "algorithm": {
      "type": "GridSampler",
      "config": {}
    },
    "budget": {
      "max_trials": 8
    }
  },
  "run_matrix": {
    "_description": "UPDATE K_knee values after Study 02 completes. Replace 'KNEE' placeholders with actual values.",
    "_K_vert_knee": "UPDATE_FROM_STUDY_02",
    "_K_lat_knee": "UPDATE_FROM_STUDY_02",
    "trials": [
      {"trial": 0, "label": "one_soft_V_top",  "K_V_top": "KNEE/10", "K_V_side": 1e12,       "K_L_side": 1e12,       "elevation": "60", "_note": "V_top 10× below knee, rest rigid"},
      {"trial": 1, "label": "one_soft_V_side",  "K_V_top": 1e12,      "K_V_side": "KNEE/10",  "K_L_side": 1e12,       "elevation": "60", "_note": "V_side 10× below knee, rest rigid"},
      {"trial": 2, "label": "one_soft_L_side",  "K_V_top": 1e12,      "K_V_side": 1e12,       "K_L_side": "KNEE/10",  "elevation": "60", "_note": "L_side 10× below knee, rest rigid"},
      {"trial": 3, "label": "combined_knee_60",  "K_V_top": "KNEE",   "K_V_side": "KNEE",     "K_L_side": "KNEE",     "elevation": "60", "_note": "All at knee values"},
      {"trial": 4, "label": "combined_knee_40",  "K_V_top": "KNEE",   "K_V_side": "KNEE",     "K_L_side": "KNEE",     "elevation": "40", "_note": "All at knee @ 40°"},
      {"trial": 5, "label": "combined_half_60",  "K_V_top": "KNEE/2", "K_V_side": "KNEE/2",   "K_L_side": "KNEE/2",   "elevation": "60", "_note": "All at half knee"},
      {"trial": 6, "label": "corr_sag_all_V_down",   "_type": "method_d", "_note": "USE Study 01 setup: dV1_Z=dV2_Z=0.001 simultaneously (all 3 vertical +1μm Z). Tests correlated frame sag."},
      {"trial": 7, "label": "corr_twist_V_split",    "_type": "method_d", "_note": "USE Study 01 setup: dV1_Z=+0.001, dV2_Z=-0.001 (V_top up, V_sides down). Tests frame twist."}
    ]
  }
}