87 lines
2.4 KiB
Markdown
87 lines
2.4 KiB
Markdown
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# Bracket Stress Minimization Study
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## Overview
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This study optimizes a structural bracket to minimize maximum von Mises stress while maintaining displacement constraints.
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## Objective
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Minimize maximum von Mises stress in the bracket under applied loading conditions.
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## Design Variables
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- **tip_thickness**: 15.0 - 25.0 mm
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- Controls the thickness of the bracket tip
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- Directly affects stress distribution and structural rigidity
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- **support_angle**: 20.0 - 40.0 degrees
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- Controls the angle of the support structure
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- Affects load path and stress concentration
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## Constraints
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- **Maximum displacement** ≤ 1.0 mm
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- Ensures the bracket maintains acceptable deformation under load
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- Prevents excessive deflection that could affect functionality
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## Model Information
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All FEA files are located in [model/](model/):
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- **Part**: [Bracket.prt](model/Bracket.prt)
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- **Simulation**: [Bracket_sim1.sim](model/Bracket_sim1.sim)
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- **FEM**: [Bracket_fem1.fem](model/Bracket_fem1.fem)
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## Optimization Settings
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- **Sampler**: TPE (Tree-structured Parzen Estimator)
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- **Total trials**: 50
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- **Startup trials**: 20 (random sampling for initial exploration)
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- **TPE candidates**: 24
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- **Multivariate**: Enabled
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## Running the Optimization
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From the project root:
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```bash
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python run_5trial_test.py # Quick 5-trial test
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```
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Or for the full optimization:
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```python
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from pathlib import Path
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from optimization_engine.runner import OptimizationRunner
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config_path = Path("studies/bracket_stress_minimization/optimization_config_stress_displacement.json")
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runner = OptimizationRunner(
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config_path=config_path,
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model_updater=bracket_model_updater,
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simulation_runner=bracket_simulation_runner,
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result_extractors={...}
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)
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study = runner.run(study_name="bracket_study", n_trials=50)
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```
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## Results
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Results are stored in [optimization_results/](optimization_results/):
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- **trial_logs/**: Detailed logs for each trial iteration
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- **history.json**: Complete trial-by-trial results
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- **history.csv**: Results in CSV format for analysis
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- **optimization_summary.json**: Best parameters and final results
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- **study_*.db**: Optuna database for resuming optimizations
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## Notes
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- Uses NX Simcenter 2412 for FEA simulation
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- Journal-based solver execution for automation
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- Results extracted from OP2 files using pyNastran
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- Stress values in MPa, displacement in mm
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## Analysis
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Post-optimization analysis plots and reports will be stored in [analysis/](analysis/).
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