{
  "study_name": "bracket_pareto_3obj",
  "description": "Three-objective Pareto optimization: minimize mass, minimize stress, maximize stiffness",
  "engineering_context": "Generated by StudyWizard on 2025-12-06 14:43",
  "template_info": {
    "category": "structural",
    "analysis_type": "static",
    "typical_applications": [],
    "neural_enabled": false
  },
  "optimization_settings": {
    "protocol": "protocol_11_multi",
    "n_trials": 100,
    "sampler": "NSGAIISampler",
    "pruner": null,
    "timeout_per_trial": 400
  },
  "design_variables": [
    {
      "parameter": "support_angle",
      "bounds": [
        20,
        70
      ],
      "description": "Angle of support arm relative to base",
      "units": "degrees"
    },
    {
      "parameter": "tip_thickness",
      "bounds": [
        30,
        60
      ],
      "description": "Thickness at bracket tip where load is applied",
      "units": "mm"
    }
  ],
  "objectives": [
    {
      "name": "mass",
      "goal": "minimize",
      "weight": 1.0,
      "description": "Total bracket mass (kg)",
      "extraction": {
        "action": "extract_mass_from_bdf",
        "domain": "result_extraction",
        "params": {}
      }
    },
    {
      "name": "stress",
      "goal": "minimize",
      "weight": 1.0,
      "description": "Maximum von Mises stress (MPa)",
      "extraction": {
        "action": "extract_solid_stress",
        "domain": "result_extraction",
        "params": {
          "metric": "max_von_mises"
        }
      }
    },
    {
      "name": "stiffness",
      "goal": "maximize",
      "weight": 1.0,
      "description": "Structural stiffness = Force/Displacement (N/mm)",
      "extraction": {
        "action": "extract_displacement",
        "domain": "result_extraction",
        "params": {
          "invert_for_stiffness": true
        }
      }
    }
  ],
  "constraints": [
    {
      "name": "stress_limit",
      "type": "less_than",
      "threshold": 300,
      "description": "Keep stress below 300 MPa for safety margin",
      "extraction": {
        "action": "extract_solid_stress",
        "domain": "result_extraction",
        "params": {}
      }
    }
  ],
  "simulation": {
    "model_file": "Bracket.prt",
    "sim_file": "Bracket_sim1.sim",
    "fem_file": "Bracket_fem1.fem",
    "solver": "nastran",
    "analysis_types": [
      "static"
    ],
    "solution_name": "Solution 1",
    "dat_file": "bracket_sim1-solution_1.dat",
    "op2_file": "bracket_sim1-solution_1.op2"
  },
  "result_extraction": {
    "mass": {
      "method": "extract_mass_from_bdf",
      "extractor_module": "optimization_engine.extractors.bdf_mass_extractor",
      "function": "extract_mass_from_bdf",
      "output_unit": "kg"
    },
    "stress": {
      "method": "extract_solid_stress",
      "extractor_module": "optimization_engine.extractors.extract_von_mises_stress",
      "function": "extract_solid_stress",
      "output_unit": "MPa"
    },
    "stiffness": {
      "method": "extract_displacement",
      "extractor_module": "optimization_engine.extractors.extract_displacement",
      "function": "extract_displacement",
      "output_unit": "mm"
    },
    "stress_limit": {
      "method": "extract_solid_stress",
      "extractor_module": "optimization_engine.extractors.extract_von_mises_stress",
      "function": "extract_solid_stress",
      "output_unit": "MPa"
    }
  },
  "reporting": {
    "generate_plots": true,
    "save_incremental": true,
    "llm_summary": true,
    "generate_pareto_front": true
  },
  "neural_acceleration": {
    "enabled": true,
    "min_training_points": 50,
    "auto_train": true,
    "epochs": 300,
    "validation_split": 0.2,
    "nn_trials": 1000,
    "validate_top_n": 10,
    "model_file": "surrogate_best.pt",
    "separate_nn_database": true,
    "description": "NN results stored in nn_study.db to avoid overloading dashboard"
  }
}