Atomizer/studies/Simple_Bracket/bracket_pareto_3obj/atomizer_spec.json

{
  "meta": {
    "version": "2.0",
    "created": "2026-01-17T15:35:12.039975Z",
    "modified": "2026-01-17T15:35:12.039975Z",
    "created_by": "migration",
    "modified_by": "migration",
    "study_name": "bracket_pareto_3obj",
    "description": "Three-objective Pareto optimization: minimize mass, minimize stress, maximize stiffness",
    "tags": []
  },
  "model": {
    "sim": {
      "path": "1_setup\\model\\Bracket_sim1.sim",
      "solver": "nastran"
    }
  },
  "design_variables": [
    {
      "id": "dv_001",
      "name": "param_1",
      "expression_name": "support_angle",
      "type": "continuous",
      "bounds": {
        "min": 20,
        "max": 70
      },
      "baseline": null,
      "units": "degrees",
      "enabled": true,
      "description": "Angle of support arm relative to base",
      "canvas_position": {
        "x": 50,
        "y": 100
      }
    },
    {
      "id": "dv_002",
      "name": "param_2",
      "expression_name": "tip_thickness",
      "type": "continuous",
      "bounds": {
        "min": 30,
        "max": 60
      },
      "baseline": null,
      "units": "mm",
      "enabled": true,
      "description": "Thickness at bracket tip where load is applied",
      "canvas_position": {
        "x": 50,
        "y": 180
      }
    }
  ],
  "extractors": [
    {
      "id": "ext_001",
      "name": "Mass Extractor",
      "type": "mass",
      "builtin": true,
      "outputs": [
        {
          "name": "mass",
          "metric": "total"
        }
      ],
      "canvas_position": {
        "x": 740,
        "y": 100
      }
    }
  ],
  "objectives": [
    {
      "id": "obj_001",
      "name": "Total bracket mass (kg)",
      "direction": "minimize",
      "weight": 1.0,
      "source": {
        "extractor_id": "ext_001",
        "output_name": "mass"
      },
      "target": null,
      "units": "",
      "canvas_position": {
        "x": 1020,
        "y": 100
      }
    },
    {
      "id": "obj_002",
      "name": "Maximum von Mises stress (MPa)",
      "direction": "minimize",
      "weight": 1.0,
      "source": {
        "extractor_id": "ext_001",
        "output_name": "stress"
      },
      "target": null,
      "units": "",
      "canvas_position": {
        "x": 1020,
        "y": 200
      }
    },
    {
      "id": "obj_003",
      "name": "Structural stiffness = Force/Displacement (N/mm)",
      "direction": "maximize",
      "weight": 1.0,
      "source": {
        "extractor_id": "ext_001",
        "output_name": "stiffness"
      },
      "target": null,
      "units": "",
      "canvas_position": {
        "x": 1020,
        "y": 300
      }
    }
  ],
  "constraints": [
    {
      "id": "con_001",
      "name": "Keep stress below 300 MPa for safety margin",
      "type": "hard",
      "operator": "<",
      "threshold": 300,
      "source": {
        "extractor_id": "ext_001",
        "output_name": "mass"
      },
      "penalty_config": {
        "method": "quadratic",
        "weight": 1000.0
      },
      "canvas_position": {
        "x": 1020,
        "y": 400
      }
    }
  ],
  "optimization": {
    "algorithm": {
      "type": "TPE",
      "config": {
        "n_startup_trials": 10
      }
    },
    "budget": {
      "max_trials": 100
    },
    "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": "ext_001",
        "target": "obj_001"
      },
      {
        "source": "ext_001",
        "target": "obj_002"
      },
      {
        "source": "ext_001",
        "target": "obj_003"
      },
      {
        "source": "ext_001",
        "target": "con_001"
      },
      {
        "source": "obj_001",
        "target": "optimization"
      },
      {
        "source": "obj_002",
        "target": "optimization"
      },
      {
        "source": "obj_003",
        "target": "optimization"
      },
      {
        "source": "con_001",
        "target": "optimization"
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    "layout_version": "2.0"
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}