Implement study persistence and resumption capabilities for optimization workflows:
Features:
- Resume existing studies to add more trials
- Create new studies when topology/config changes
- Study metadata tracking (creation date, trials, config hash)
- SQLite database persistence for Optuna studies
- Configuration change detection with warnings
- List all available studies
Key Changes:
- Enhanced OptimizationRunner.run() with resume parameter
- Added _load_existing_study() for study resumption
- Added _save_study_metadata() for tracking
- Added _get_config_hash() to detect topology changes
- Added list_studies() to view all studies
- SQLite storage for study persistence
Updated Files:
- optimization_engine/runner.py: Core study management
- examples/test_journal_optimization.py: Interactive study management
- examples/study_management_example.py: Comprehensive examples
Usage Examples:
# New study
runner.run(study_name="bracket_v1", n_trials=50)
# Resume study (add 25 more trials)
runner.run(study_name="bracket_v1", n_trials=25, resume=True)
# New study after topology change
runner.run(study_name="bracket_v2", n_trials=50)
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Round design variables, objectives, and constraints to appropriate
decimal precision based on physical units (4 decimals for mm, degrees, MPa).
- Added _get_precision() method with unit-based precision mapping
- Round design variables when sampled from Optuna
- Round extracted results (objectives and constraints)
- Added units field to objectives in config files
- Tested: values now show 4 decimals instead of 17+
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Critical fix - the expressions were not being applied during optimization!
The journal now receives expression values and applies them using
EditExpressionWithUnits() BEFORE rebuilding geometry and regenerating FEM.
## Key Changes
### Expression Application in Journal (solve_simulation.py)
- Journal now accepts expression values as arguments (tip_thickness, support_angle)
- Applies expressions using EditExpressionWithUnits() on active Bracket part
- Calls MakeUpToDate() on each modified expression
- Then calls UpdateManager.DoUpdate() to rebuild geometry with new values
- Follows the exact pattern from the user's working journal
### NX Solver Updates (nx_solver.py)
- Added expression_updates parameter to run_simulation() and run_nx_simulation()
- Passes expression values to journal via sys.argv
- For bracket: passes tip_thickness and support_angle as separate args
### Test Script Updates (test_journal_optimization.py)
- Removed nx_updater step (no longer needed - expressions applied in journal)
- model_updater now just stores design vars in global variable
- simulation_runner passes expression_updates to nx_solver
- Sequential workflow: update vars -> run journal (apply expressions) -> extract results
## Results - OPTIMIZATION NOW WORKS!
Before (all trials same stress):
- Trial 0: tip=23.48, angle=37.21 → stress=197.89 MPa
- Trial 1: tip=20.08, angle=20.32 → stress=197.89 MPa (SAME!)
- Trial 2: tip=18.19, angle=35.23 → stress=197.89 MPa (SAME!)
After (varying stress values):
- Trial 0: tip=21.62, angle=30.15 → stress=192.71 MPa ✅
- Trial 1: tip=17.17, angle=33.52 → stress=167.96 MPa ✅ BEST!
- Trial 2: tip=15.06, angle=21.81 → stress=242.50 MPa ✅
Mesh also changes: 1027 → 951 CTETRA elements with different parameters.
The optimization loop is now fully functional with expressions being properly
applied and the FEM regenerating with correct geometry!
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This commit completes the optimization loop infrastructure by implementing
the full FEM regeneration workflow based on the user's working journal.
## Changes
### FEM Regeneration Workflow (solve_simulation.py)
- Added STEP 1: Switch to Bracket.prt and update geometry
- Uses SetActiveDisplay() to make Bracket.prt active
- Calls UpdateManager.DoUpdate() to rebuild CAD geometry with new expressions
- Added STEP 2: Switch to Bracket_fem1 and update FE model
- Uses SetActiveDisplay() to make FEM active
- Calls fEModel1.UpdateFemodel() to regenerate FEM with updated geometry
- Added STEP 3: Switch back to sim part before solving
- Close and reopen .sim file to force reload from disk
### Enhanced Journal Output (nx_solver.py)
- Display journal stdout output for debugging
- Shows all journal steps: geometry update, FEM regeneration, solve, save
- Helps verify workflow execution
### Verification Tools
- Added verify_parametric_link.py journal to check expression dependencies
- Added FEM_REGENERATION_STATUS.md documenting the complete status
## Status
### ✅ Fully Functional Components
1. Parameter updates - nx_updater.py modifies .prt expressions
2. NX solver - ~4s per solve via journal
3. Result extraction - pyNastran reads .op2 files
4. History tracking - saves to JSON/CSV
5. Optimization loop - Optuna explores parameter space
6. **FEM regeneration workflow** - Journal executes all steps successfully
### ❌ Remaining Issue: Expressions Not Linked to Geometry
The optimization returns identical stress values (197.89 MPa) for all trials
because the Bracket.prt expressions are not referenced by any geometry features.
Evidence:
- Journal verification shows FEM update steps execute successfully
- Feature dependency check shows no features reference the expressions
- All optimization infrastructure is working correctly
The code is ready - waiting for Bracket.prt to have its expressions properly
linked to the geometry features in NX.
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Implements NX solver integration that connects to running Simcenter3D GUI
to solve simulations using the journal API. This approach handles licensing
properly and ensures fresh output files are generated for each iteration.
**New Components:**
- optimization_engine/nx_solver.py: Main solver wrapper with auto-detection
- optimization_engine/solve_simulation.py: NX journal script for batch solving
- examples/test_journal_optimization.py: Complete optimization workflow test
- examples/test_nx_solver.py: Solver integration tests
- tests/journal_*.py: Reference journal files for NX automation
**Key Features:**
- Auto-detects NX installation and version
- Connects to running NX GUI session (uses existing license)
- Closes/reopens .sim files to force reload of updated .prt files
- Deletes old output files to force fresh solves
- Waits for background solve completion
- Saves simulation to ensure all outputs are written
- ~4 second solve time per iteration
**Workflow:**
1. Update parameters in .prt file (nx_updater.py)
2. Close any open parts in NX session
3. Open .sim file fresh from disk (loads updated .prt)
4. Reload components and switch to FEM component
5. Solve in background mode
6. Save .sim file
7. Wait for .op2/.f06 to appear
8. Extract results from fresh .op2
**Tested:**
- Multiple iteration loop (3+ iterations)
- Files regenerated fresh each time (verified by timestamps)
- Complete parameter update -> solve -> extract workflow
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Integrate OP2 data extraction with optimization config builder:
- Add build_optimization_config() MCP tool
- Add list_optimization_options() helper
- Add format_optimization_options_for_llm() formatter
- Update MCP tools documentation with full API details
- Test with bracket example, generates valid config
Features:
- Discovers design variables from FEA model
- Lists 4 available objectives (mass, stress, displacement, volume)
- Lists 4 available constraints (stress/displacement/mass limits)
- Validates user selections against model
- Generates complete optimization_config.json
Tested with examples/bracket/Bracket_sim1.sim:
- Found 4 design variables (support_angle, tip_thickness, p3, support_blend_radius)
- Created config with 2 objectives, 2 constraints, 150 trials
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Added complete working example with all NX result files for testing
and validation of the OP2 result extractor.
Files Added (examples/bracket/):
- Bracket.prt: Part geometry with expressions
- Bracket_sim1.sim: Simulation definition (SOL 101 Linear Statics)
- Bracket_fem1.fem: Finite element mesh
- bracket_sim1-solution_1.op2: Binary results (666 KB)
- bracket_sim1-solution_1.f06: ASCII results log
- bracket_sim1-solution_1.dat: Nastran input deck
- Supporting files: .diag, .f04, .log, .html, .png
Validated Results from OP2:
✓ Max Displacement: 0.362 mm (node 91)
- Primary direction: -Z (-0.354 mm)
- Load application point
✓ Max von Mises Stress: 122.91 MPa (element 79, CHEXA)
- Material: Aluminum 6061-T6 (yield = 276 MPa)
- Safety Factor: 2.25 ✅ SAFE
- Well below yield strength
Units Handling:
- NX units: mm, mN (milli-newton), kg
- Stress in OP2: mN/mm² = kPa
- Conversion required: kPa / 1000 = MPa
- Displacement: mm (direct)
Model Properties:
- Analysis Type: SOL 101 Linear Statics
- Elements: 585 (CHEXA hexahedral)
- Load: ~1000 N in -Z direction (3 application points)
- Constraints: Fixed supports at base
- Material: Al 6061-T6
Optimization Potential:
Current design has good margins:
- Displacement: 0.36 mm (could allow up to ~1.0 mm)
- Stress: 122.91 MPa (could allow up to ~200 MPa)
→ Weight reduction opportunity while maintaining safety!
This validates:
- pyNastran OP2 extraction works correctly
- Units conversion handling (mN → N, kPa → MPa)
- Multi-objective optimization is feasible
- Example ready for testing optimization workflow
- Include .op2, .f06, .f04, .log, .diag files
- Provide complete example with all solver outputs
- Override .gitignore for example files
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- Move bracket simulation files to examples/bracket/
- Remove misplaced files from tests directory
- Properly organize example NX files for reference
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Added bracket_sim1-solution_1.dat (Nastran input file) to tests.
This is the SOL 101 Linear Statics input for the Bracket model.
Analysis Setup:
- Solution: SOL 101 Linear Statics
- Loads: ~1000N total force in -Z direction (3 application points)
- Constraints: Fixed supports at base (40+ nodes)
- Mesh: ~585 elements (CTETRA)
- Material: Aluminum 6061-T6
- Units: mm, mN (milli-newton), kg
Note: This is the INPUT file. To test the OP2 extractor, the
corresponding OUTPUT file (bracket_sim1-solution_1.op2) is needed,
which is generated by running the solver in NX Simcenter.
Enhanced expression extraction to find ALL named expressions in .prt files,
not just specific format. Added pyNastran-based result extraction example.
Expression Extraction Improvements:
- Updated regex to handle all NX expression format variations:
* #(Type [units]) name: value;
* (Type [units]) name: value;
* *(Type [units]) name: value;
* ((Type [units]) name: value;
- Added Root:expression_name: pattern detection
- Finds expressions even when value is not immediately available
- Deduplication to avoid duplicates
- Filters out NX internal names
Test Results with Bracket.prt:
- Previously: 1 expression (tip_thickness only)
- Now: 5 expressions found:
* support_angle = 30.0 degrees
* tip_thickness = 20.0 mm
* p3 = 10.0 mm
* support_blend_radius = 10.0 mm
* p11 (reference found, value unknown)
OP2 Result Extraction (pyNastran):
- Created example extractor: op2_extractor_example.py
- Functions for common optimization metrics:
* extract_max_displacement() - max displacement magnitude on any node
* extract_max_stress() - von Mises or max principal stress
* extract_mass() - total mass and center of gravity
- Handles multiple element types (CQUAD4, CTRIA3, CTETRA, etc.)
- Returns structured JSON for optimization engine integration
- Command-line tool for testing with real OP2 files
Usage:
python optimization_engine/result_extractors/op2_extractor_example.py <file.op2>
Integration Ready:
- pyNastran already in requirements.txt
- Result extractor pattern established
- Can be used as template for custom metrics
Next Steps:
- Integrate result extractors into MCP tool framework
- Add safety factor calculations
- Support for thermal, modal results
Updated the parser to work with actual NX .sim/.prt files which are
binary format (not XML) in NX 12+.
Key Changes:
- Added dual-mode parser: XML for test files, binary for real NX files
- Implemented string extraction from binary .sim files
- Updated solution detection to recognize Nastran SOL types
- Fixed expression extraction with proper NX format pattern:
#(Type [units]) name: value;
- Added multiple .prt file naming pattern support
- Added .fem file parsing for FEM information
Parser Capabilities:
- Extracts expressions from .prt files (binary parsing)
- Detects solution types (Linear Statics, Modal, etc.)
- Finds element types from .fem files
- Handles multiple file naming conventions
Validation with Real Files:
- Successfully parsed tests/Bracket_sim1.sim (6.2 MB binary file)
- Extracted 1 expression: tip_thickness = 20.0 mm
- Detected 18 solution types (including Nastran SOL codes)
- Works with both XML test files and binary production files
Technical Details:
- Binary files: latin-1 decoding + regex pattern matching
- Expression pattern: #(\w+\s*\[([^\]]*)\])\s*([a-zA-Z_][a-zA-Z0-9_]*)\s*:\s*([-+]?\d*\.?\d+)
- Multiple .prt file search: exact match → base name → _i suffix
- FEM parsing: extracts mesh, materials, element types from .fem files
Next Steps:
- Refine solution filtering (reduce false positives)
- Add load/constraint extraction from .fem files
- Test with more complex models
- Add bracket part and FEM model files
- Include simulation results and solver outputs
- Add test data for development and validation
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This commit implements the first phase of the MCP server as outlined
in PROJECT_SUMMARY.md Option A: Model Discovery.
New Features:
- Complete .sim file parser (XML-based)
- Expression extraction from .sim and .prt files
- Solution, FEM, materials, loads, constraints extraction
- Structured JSON output for LLM consumption
- Markdown formatting for human-readable output
Implementation Details:
- mcp_server/tools/model_discovery.py: Core parser and discovery logic
- SimFileParser class: Handles XML parsing of .sim files
- discover_fea_model(): Main MCP tool function
- format_discovery_result_for_llm(): Markdown formatter
- mcp_server/tools/__init__.py: Updated to export new functions
- mcp_server/tools/README.md: Complete documentation for MCP tools
Testing & Examples:
- examples/test_bracket.sim: Sample .sim file for testing
- tests/mcp_server/tools/test_model_discovery.py: Comprehensive unit tests
- Manual testing verified: Successfully extracts 4 expressions, solution
info, mesh data, materials, loads, and constraints
Validation:
- Command-line tool works: python mcp_server/tools/model_discovery.py examples/test_bracket.sim
- Output includes both Markdown and JSON formats
- Error handling for missing files and invalid formats
Next Steps (Phase 2):
- Port optimization engine from P04 Atomizer
- Implement build_optimization_config tool
- Create pluggable result extractor system
References:
- PROJECT_SUMMARY.md: Option A (lines 339-350)
- mcp_server/prompts/system_prompt.md: Model Discovery workflow
- Create comprehensive NXOpen resources documentation
- Document NXOpenTSE as reference (not dependency)
- Add MCP system prompt with NXOpen guidance
- Include best practices from The Scripting Engineer
- Update README with resource links
- Define LLM workflow for NXOpen code generation
Resources:
- Official Siemens NXOpen API docs
- NXOpenTSE documentation and examples
- Attribution and licensing guidelines
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- Update project name in all documentation files
- Update GitHub repository references to Anto01/Atomizer
- Update Python package name to 'atomizer'
- Update conda environment name references
- Update all module docstrings with new branding
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- Set up Python package structure with pyproject.toml
- Created MCP server, optimization engine, and NX journals modules
- Added configuration templates
- Implemented pluggable result extractor architecture
- Comprehensive README with architecture overview
- Project ready for GitHub push
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