{
  "meta": {
    "version": "2.0",
    "created": "2026-01-17T15:35:12.044509Z",
    "modified": "2026-01-17T15:35:12.044509Z",
    "created_by": "migration",
    "modified_by": "migration",
    "study_name": "bracket_stiffness_optimization_v3",
    "description": "Maximize bracket stiffness while minimizing mass (constraint: mass ≤ 0.2 kg)",
    "tags": []
  },
  "model": {
    "sim": {
      "path": "1_setup/model/Bracket_sim1.sim",
      "solver": "NX_Nastran",
      "solution_type": "SOL101"
    },
    "nx_part": {
      "path": "1_setup/model/Bracket.prt"
    },
    "fem": {
      "path": "1_setup/model/Bracket_fem1.fem"
    }
  },
  "design_variables": [
    {
      "id": "dv_001",
      "name": "support_angle",
      "expression_name": "support_angle",
      "type": "continuous",
      "bounds": {
        "min": 20.0,
        "max": 70.0
      },
      "baseline": 60.0,
      "units": "degrees",
      "enabled": true,
      "description": "Angle of support arm relative to base",
      "canvas_position": {
        "x": 50,
        "y": 100
      }
    },
    {
      "id": "dv_002",
      "name": "tip_thickness",
      "expression_name": "tip_thickness",
      "type": "continuous",
      "bounds": {
        "min": 30.0,
        "max": 60.0
      },
      "baseline": 30.0,
      "units": "mm",
      "enabled": true,
      "description": "Thickness of bracket tip where load is applied",
      "canvas_position": {
        "x": 50,
        "y": 180
      }
    }
  ],
  "extractors": [
    {
      "id": "ext_001",
      "name": "BracketStiffnessExtractor Extractor",
      "type": "displacement",
      "builtin": true,
      "config": {
        "result_type": "z",
        "metric": "max_abs"
      },
      "outputs": [
        {
          "name": "stiffness",
          "metric": "max_abs"
        },
        {
          "name": "mass",
          "metric": "max_abs"
        }
      ],
      "canvas_position": {
        "x": 740,
        "y": 100
      }
    },
    {
      "id": "ext_002",
      "name": "Mass Extractor",
      "type": "mass",
      "builtin": true,
      "outputs": [
        {
          "name": "mass_kg",
          "metric": "total"
        }
      ],
      "canvas_position": {
        "x": 740,
        "y": 250
      }
    }
  ],
  "objectives": [
    {
      "id": "obj_001",
      "name": "Structural stiffness (N/mm) calculated as Force/Displacement",
      "direction": "maximize",
      "weight": 1.0,
      "source": {
        "extractor_id": "ext_001",
        "output_name": "stiffness"
      },
      "target": null,
      "units": "",
      "canvas_position": {
        "x": 1020,
        "y": 100
      }
    },
    {
      "id": "obj_002",
      "name": "Total mass (kg) - secondary objective with hard constraint",
      "direction": "minimize",
      "weight": 0.1,
      "source": {
        "extractor_id": "ext_001",
        "output_name": "mass"
      },
      "target": null,
      "units": "",
      "canvas_position": {
        "x": 1020,
        "y": 200
      }
    }
  ],
  "constraints": [
    {
      "id": "con_001",
      "name": "Maximum allowable mass: 200 grams",
      "type": "hard",
      "operator": "<",
      "threshold": 0.2,
      "source": {
        "extractor_id": "ext_002",
        "output_name": "mass_kg"
      },
      "penalty_config": {
        "method": "quadratic",
        "weight": 1000.0
      },
      "canvas_position": {
        "x": 1020,
        "y": 400
      }
    }
  ],
  "optimization": {
    "algorithm": {
      "type": "NSGA-II",
      "config": {
        "population_size": 50,
        "seed": 42
      }
    },
    "budget": {
      "max_trials": 50
    },
    "canvas_position": {
      "x": 1300,
      "y": 150
    }
  },
  "canvas": {
    "edges": [
      {
        "source": "dv_001",
        "target": "model"
      },
      {
        "source": "dv_002",
        "target": "model"
      },
      {
        "source": "model",
        "target": "solver"
      },
      {
        "source": "solver",
        "target": "ext_001"
      },
      {
        "source": "solver",
        "target": "ext_002"
      },
      {
        "source": "ext_001",
        "target": "obj_001"
      },
      {
        "source": "ext_001",
        "target": "obj_002"
      },
      {
        "source": "ext_002",
        "target": "con_001"
      },
      {
        "source": "obj_001",
        "target": "optimization"
      },
      {
        "source": "obj_002",
        "target": "optimization"
      },
      {
        "source": "con_001",
        "target": "optimization"
      }
    ],
    "layout_version": "2.0"
  }
}