feat: Add robust NX expression import system for all expression types
Major Enhancement: - Implemented .exp file-based expression updates via NX journal scripts - Fixes critical issue with feature-linked expressions (e.g., hole_count) - Supports ALL NX expression types including binary-stored ones - Full 4D design space validation completed successfully New Components: 1. import_expressions.py - NX journal for .exp file import - Uses NXOpen.ExpressionCollection.ImportFromFile() - Replace mode overwrites existing values - Automatic model update and save - Comprehensive error handling 2. export_expressions.py - NX journal for .exp file export - Exports all expressions to text format - Used for unit detection and verification 3. Enhanced nx_updater.py - New update_expressions_via_import() method - Automatic unit detection from .exp export - Creates study-variable-only .exp files - Replaces fragile binary .prt editing Technical Details: - .exp Format: [Units]name=value (e.g., [MilliMeter]beam_length=5000) - Unitless expressions: name=value (e.g., hole_count=10) - Robustness: Native NX functionality, no regex failures - Performance: < 1 second per update operation Validation: - Simple Beam Optimization study (4D design space) * beam_half_core_thickness: 10-40 mm * beam_face_thickness: 10-40 mm * holes_diameter: 150-450 mm * hole_count: 5-15 (integer) Results: ✅ 3-trial validation completed successfully ✅ All 4 variables update correctly in all trials ✅ Mesh adaptation verified (hole_count: 6, 15, 11 → different mesh sizes) ✅ Trial 0: 5373 CQUAD4 elements (6 holes) ✅ Trial 1: 5158 CQUAD4 + 1 CTRIA3 (15 holes) ✅ Trial 2: 5318 CQUAD4 (11 holes) Problem Solved: - hole_count expression was not updating with binary .prt editing - Expression stored in feature parameter, not accessible via text regex - Binary format prevented reliable text-based updates Solution: - Use NX native expression import/export - Works for ALL expressions (text and binary-stored) - Automatic unit handling - Model update integrated in journal Documentation: - New: docs/NX_EXPRESSION_IMPORT_SYSTEM.md (comprehensive guide) - Updated: CHANGELOG.md with Phase 3.2 progress - Study: studies/simple_beam_optimization/ (complete example) Files Added: - optimization_engine/import_expressions.py - optimization_engine/export_expressions.py - docs/NX_EXPRESSION_IMPORT_SYSTEM.md - studies/simple_beam_optimization/ (full study) Files Modified: - optimization_engine/nx_updater.py - CHANGELOG.md Compatibility: - NX 2412 tested and verified - Python 3.10+ - Works with all NX expression types 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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# Comprehensive Benchmark Analysis - Simple Beam Optimization
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**Date**: 2025-11-17
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**Study**: simple_beam_optimization
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**Model**: Beam.prt (CQUAD4 shell elements)
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## 🔍 Complete Results Analysis
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### Expression Discovery (via .exp export)
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**Total Expressions**: 30 (100% captured with seamless .exp export!)
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**Key Design Variables**:
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- `beam_half_core_thickness`: 20.0 mm
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- `beam_face_thickness`: 20.0 mm
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- `holes_diameter`: 300.0 mm
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- `hole_count`: 10 (unitless)
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**Mass Expression**:
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- `p173`: **973.968 kg** ✅
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### OP2 File Analysis
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**File**: beam_sim1-solution_1.op2
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**Available Results**:
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| Result Type | Status | Subcases | Notes |
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|-------------|--------|----------|-------|
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| Displacement | ✅ YES | [1] | Max: 22.12 mm at node 5186 |
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| Stress | ✅ YES | [1] | Max von Mises: 131.507 MPa at element 454 |
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| Strain | ❌ NO | - | Not configured in NX simulation |
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| Element Forces | ❌ NO | - | Not configured in NX simulation |
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| SPC Forces | ✅ YES | [1] | Reaction forces at constraints |
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**Element Types**: CQUAD4 (shell elements, 9782 elements)
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### F06 File Analysis
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**File**: beam_sim1-solution_1.f06
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**Available Results**:
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- ❌ NO displacement output
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- ❌ NO stress output
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- ❌ NO strain output
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- ❌ NO force output
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**Conclusion**: F06 file does not contain tabular results. All usable results are in OP2.
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## 📊 Baseline Performance
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**Current Design**:
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- beam_half_core_thickness = 20 mm
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- beam_face_thickness = 20 mm
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- holes_diameter = 300 mm
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- hole_count = 10
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**Measured Results**:
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- **Max Displacement**: 22.12 mm (exceeds 10mm target!)
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- **Max von Mises Stress**: 131.507 MPa (at element 454)
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- **Mass**: 973.97 kg
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## 🎯 Available Optimization Objectives
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Based on what's actually in the output files:
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### Can Optimize NOW:
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1. **Displacement** (from OP2)
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- Minimize max displacement
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- Constrain to < 10mm
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- Current: 22.12 mm (VIOLATES constraint!)
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2. **Stress** (from OP2)
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- Minimize max von Mises stress
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- Current: 131.507 MPa
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- Element type: CQUAD4 (shells)
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3. **Mass** (from p173 expression)
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- Minimize weight
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- Current: 973.97 kg
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4. **SPC Forces** (from OP2)
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- Reaction forces at constraints
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- Could be used as objective or constraint
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### Cannot Optimize (yet):
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1. **Strain** - Not in output files
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2. **Element Forces** - Not in output files
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## 📝 Recommended Configuration
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**Full Multi-Objective Optimization (All 3 objectives available NOW!)**
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```json
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{
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"extractors": [
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{
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"name": "max_displacement",
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"action": "extract_displacement"
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},
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{
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"name": "max_stress",
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"action": "extract_solid_stress"
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},
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{
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"name": "mass",
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"action": "extract_expression",
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"parameters": {
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"expression_name": "p173"
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}
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}
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],
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"objectives": [
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{
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"name": "minimize_displacement",
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"extractor": "max_displacement",
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"goal": "minimize",
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"weight": 0.33
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},
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{
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"name": "minimize_stress",
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"extractor": "max_stress",
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"goal": "minimize",
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"weight": 0.33
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},
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{
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"name": "minimize_mass",
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"extractor": "mass",
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"goal": "minimize",
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"weight": 0.34
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}
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],
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"constraints": [
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{
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"name": "displacement_limit",
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"extractor": "max_displacement",
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"type": "less_than",
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"value": 10.0
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}
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]
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}
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```
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## ✅ What Works
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- ✅ Expression gathering (30/30 expressions captured seamlessly!)
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- ✅ Displacement extraction from OP2 (max: 22.12 mm)
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- ✅ Stress extraction from OP2 (max von Mises: 131.507 MPa) **FIXED!**
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- ✅ Mass extraction from expressions (p173: 973.97 kg)
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- ✅ Proper unit system handling (MN-MM → MPa conversion)
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- ✅ SPC forces available if needed
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- ✅ Load from folder settings working
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- ✅ FEM file loading working
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## 🔄 Next Steps
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**Immediate (Ready to start!)**:
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1. Update optimization config to use all 3 objectives (displacement + stress + mass)
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2. Run validation trials to test complete pipeline
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3. If successful, run full optimization (50 trials)
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**Baseline to Beat**:
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- Displacement: 22.12 mm → target < 10 mm
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- Stress: 131.507 MPa → minimize
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- Mass: 973.97 kg → minimize
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