Anto01
8b14f6e800
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>
100 lines
2.5 KiB
JSON
100 lines
2.5 KiB
JSON
{
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"study_name": "simple_beam_optimization",
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"description": "Minimize displacement and weight of beam with stress constraint",
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"substudy_name": "initial_exploration",
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"design_variables": {
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"beam_half_core_thickness": {
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"type": "continuous",
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"min": 10.0,
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"max": 40.0,
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"baseline": 20.0,
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"units": "mm",
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"description": "Half thickness of beam core"
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},
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"beam_face_thickness": {
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"type": "continuous",
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"min": 10.0,
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"max": 40.0,
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"baseline": 20.0,
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"units": "mm",
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"description": "Thickness of beam face sheets"
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},
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"holes_diameter": {
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"type": "continuous",
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"min": 150.0,
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"max": 450.0,
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"baseline": 300.0,
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"units": "mm",
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"description": "Diameter of lightening holes"
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},
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"hole_count": {
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"type": "integer",
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"min": 5,
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"max": 20,
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"baseline": 10,
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"units": "unitless",
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"description": "Number of lightening holes"
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}
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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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"description": "Extract maximum displacement from OP2",
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"parameters": {
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"metric": "max"
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}
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},
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{
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"name": "max_von_mises",
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"action": "extract_solid_stress",
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"description": "Extract maximum von Mises stress from OP2",
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"parameters": {
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"stress_type": "von_mises",
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"metric": "max"
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}
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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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"description": "Extract mass from p173 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_stress",
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"extractor": "max_von_mises",
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"goal": "minimize",
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"weight": 0.5,
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"description": "Minimize maximum von Mises stress for structural safety"
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},
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{
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"name": "minimize_weight",
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"extractor": "mass",
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"goal": "minimize",
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"weight": 0.5,
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"description": "Minimize beam mass (p173 in kg)"
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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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"units": "mm",
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"description": "Maximum displacement must be less than 10mm across entire beam"
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}
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],
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"optimization_settings": {
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"algorithm": "optuna",
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"n_trials": 50,
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"sampler": "TPE",
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"pruner": "HyperbandPruner",
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"direction": "minimize",
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"timeout_per_trial": 600
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}
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} |