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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# Benchmarking Report
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**Study**: simple_beam_optimization
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**Date**: 2025-11-17T11:18:28.329069
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**Validation**: ✅ PASSED
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## Model Introspection
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**Expressions Found**: 30
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| Expression | Value | Units |
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|------------|-------|-------|
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| Pattern_p7 | None | |
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| Pattern_p8 | 444.444444444444 | MilliMeter |
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| Pattern_p9 | None | MilliMeter |
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| Pattern_p10 | 1.0 | |
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| Pattern_p11 | 10.0 | MilliMeter |
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| Pattern_p12 | 0.0 | MilliMeter |
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| beam_face_thickness | 20.0 | MilliMeter |
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| beam_half_core_thickness | 20.0 | MilliMeter |
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| beam_half_height | 250.0 | MilliMeter |
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| beam_half_width | 150.0 | MilliMeter |
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| beam_lenght | 5000.0 | MilliMeter |
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| hole_count | 10.0 | |
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| holes_diameter | 300.0 | MilliMeter |
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| p4 | None | MilliMeter |
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| p5 | 0.0 | MilliMeter |
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| p6 | 4000.0 | MilliMeter |
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| p13 | 0.0 | Degrees |
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| p19 | 4000.0 | MilliMeter |
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| p34 | 4000.0 | MilliMeter |
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| p50 | 4000.0 | MilliMeter |
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| p119 | 4000.0 | MilliMeter |
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| p130 | 10.0 | |
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| p132 | 444.444444444444 | MilliMeter |
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| p134 | 4000.0 | MilliMeter |
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| p135 | 4000.0 | MilliMeter |
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| p137 | 1.0 | |
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| p139 | 10.0 | MilliMeter |
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| p141 | 0.0 | MilliMeter |
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| p143 | 0.0 | Degrees |
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| p173 | 973.968443678471 | Kilogram |
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## OP2 Analysis
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- **Element Types**: CQUAD4
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- **Result Types**: displacement, stress
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- **Subcases**: [1]
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- **Nodes**: 0
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- **Elements**: 0
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## Baseline Performance
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*No baseline results extracted*
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## Configuration Proposals
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### Proposed Design Variables
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- **Pattern_p7**: ±20% of None
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- **Pattern_p8**: ±20% of 444.444444444444 MilliMeter
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- **Pattern_p9**: ±20% of None MilliMeter
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- **Pattern_p10**: ±20% of 1.0
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- **Pattern_p11**: ±20% of 10.0 MilliMeter
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- **Pattern_p12**: ±20% of 0.0 MilliMeter
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- **beam_face_thickness**: ±20% of 20.0 MilliMeter
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- **beam_half_core_thickness**: ±20% of 20.0 MilliMeter
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- **beam_half_height**: ±20% of 250.0 MilliMeter
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- **beam_half_width**: ±20% of 150.0 MilliMeter
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- **beam_lenght**: ±20% of 5000.0 MilliMeter
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- **hole_count**: ±20% of 10.0
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- **holes_diameter**: ±20% of 300.0 MilliMeter
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- **p4**: ±20% of None MilliMeter
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- **p5**: ±20% of 0.0 MilliMeter
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- **p6**: ±20% of 4000.0 MilliMeter
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- **p13**: ±20% of 0.0 Degrees
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- **p19**: ±20% of 4000.0 MilliMeter
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- **p34**: ±20% of 4000.0 MilliMeter
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- **p50**: ±20% of 4000.0 MilliMeter
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- **p119**: ±20% of 4000.0 MilliMeter
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- **p130**: ±20% of 10.0
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- **p132**: ±20% of 444.444444444444 MilliMeter
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- **p134**: ±20% of 4000.0 MilliMeter
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- **p135**: ±20% of 4000.0 MilliMeter
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- **p137**: ±20% of 1.0
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- **p139**: ±20% of 10.0 MilliMeter
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- **p141**: ±20% of 0.0 MilliMeter
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- **p143**: ±20% of 0.0 Degrees
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- **p173**: ±20% of 973.968443678471 Kilogram
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### Proposed Extractors
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- **extract_displacement**: Extract displacement results from OP2 file
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- **extract_solid_stress**: Extract stress from CQUAD4 elements
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### Proposed Objectives
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- max_displacement (minimize or maximize)
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- max_von_mises (minimize for safety)
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{
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"timestamp": "2025-11-17T11:18:28.329069",
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"expressions": {
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"Pattern_p7": {
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"value": null,
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"units": "",
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"formula": "hole_count",
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"type": "Number"
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},
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"Pattern_p8": {
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"value": 444.444444444444,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"Pattern_p9": {
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"value": null,
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"units": "MilliMeter",
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"formula": "p6",
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"type": "Number"
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},
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"Pattern_p10": {
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"value": 1.0,
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"units": "",
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"formula": null,
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"type": "Number"
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},
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"Pattern_p11": {
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"value": 10.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"Pattern_p12": {
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"value": 0.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"beam_face_thickness": {
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"value": 20.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"beam_half_core_thickness": {
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"value": 20.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"beam_half_height": {
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"value": 250.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"beam_half_width": {
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"value": 150.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"beam_lenght": {
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"value": 5000.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"hole_count": {
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"value": 10.0,
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"units": "",
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"formula": null,
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"type": "Number"
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},
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"holes_diameter": {
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"value": 300.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p4": {
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"value": null,
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"units": "MilliMeter",
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"formula": "beam_lenght",
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"type": "Number"
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},
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"p5": {
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"value": 0.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p6": {
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"value": 4000.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p13": {
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"value": 0.0,
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"units": "Degrees",
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"formula": null,
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"type": "Number"
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},
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"p19": {
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"value": 4000.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p34": {
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"value": 4000.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p50": {
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"value": 4000.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p119": {
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"value": 4000.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p130": {
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"value": 10.0,
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"units": "",
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"formula": null,
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"type": "Number"
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},
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"p132": {
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"value": 444.444444444444,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p134": {
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"value": 4000.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p135": {
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"value": 4000.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p137": {
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"value": 1.0,
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"units": "",
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"formula": null,
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"type": "Number"
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},
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"p139": {
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"value": 10.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p141": {
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"value": 0.0,
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"units": "MilliMeter",
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"formula": null,
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"type": "Number"
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},
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"p143": {
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"value": 0.0,
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"units": "Degrees",
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"formula": null,
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"type": "Number"
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},
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"p173": {
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"value": 973.968443678471,
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"units": "Kilogram",
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"formula": null,
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"type": "Number"
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}
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},
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"expression_count": 30,
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"element_types": [
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"CQUAD4"
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],
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"result_types": [
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"displacement",
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"stress"
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],
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"subcases": [
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1
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],
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"node_count": 0,
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"element_count": 0,
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"baseline_op2_path": "studies\\simple_beam_optimization\\model\\beam_sim1-solution_1.op2",
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"baseline_results": {},
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"simulation_works": true,
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"extraction_works": true,
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"validation_passed": true,
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"proposed_design_variables": [
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{
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"parameter": "Pattern_p7",
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"current_value": null,
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"units": "",
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"suggested_range": "\u00b120% of None "
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},
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{
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"parameter": "Pattern_p8",
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"current_value": 444.444444444444,
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"units": "MilliMeter",
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"suggested_range": "\u00b120% of 444.444444444444 MilliMeter"
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},
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{
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"parameter": "Pattern_p9",
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"current_value": null,
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"units": "MilliMeter",
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"suggested_range": "\u00b120% of None MilliMeter"
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},
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{
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"parameter": "Pattern_p10",
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"current_value": 1.0,
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"units": "",
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"suggested_range": "\u00b120% of 1.0 "
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},
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{
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"parameter": "Pattern_p11",
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"current_value": 10.0,
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"units": "MilliMeter",
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"suggested_range": "\u00b120% of 10.0 MilliMeter"
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},
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{
|
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"parameter": "Pattern_p12",
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"current_value": 0.0,
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"units": "MilliMeter",
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"suggested_range": "\u00b120% of 0.0 MilliMeter"
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},
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{
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"parameter": "beam_face_thickness",
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"current_value": 20.0,
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"units": "MilliMeter",
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"suggested_range": "\u00b120% of 20.0 MilliMeter"
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},
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{
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"parameter": "beam_half_core_thickness",
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"current_value": 20.0,
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"units": "MilliMeter",
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"suggested_range": "\u00b120% of 20.0 MilliMeter"
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},
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{
|
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"parameter": "beam_half_height",
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"current_value": 250.0,
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"units": "MilliMeter",
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"suggested_range": "\u00b120% of 250.0 MilliMeter"
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},
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{
|
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"parameter": "beam_half_width",
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"current_value": 150.0,
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"units": "MilliMeter",
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"suggested_range": "\u00b120% of 150.0 MilliMeter"
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},
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{
|
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"parameter": "beam_lenght",
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"current_value": 5000.0,
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"units": "MilliMeter",
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"suggested_range": "\u00b120% of 5000.0 MilliMeter"
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},
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{
|
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"parameter": "hole_count",
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"current_value": 10.0,
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"units": "",
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"suggested_range": "\u00b120% of 10.0 "
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},
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{
|
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"parameter": "holes_diameter",
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"current_value": 300.0,
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"units": "MilliMeter",
|
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"suggested_range": "\u00b120% of 300.0 MilliMeter"
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},
|
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{
|
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"parameter": "p4",
|
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"current_value": null,
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"units": "MilliMeter",
|
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"suggested_range": "\u00b120% of None MilliMeter"
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},
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{
|
||||
"parameter": "p5",
|
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"current_value": 0.0,
|
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"units": "MilliMeter",
|
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"suggested_range": "\u00b120% of 0.0 MilliMeter"
|
||||
},
|
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{
|
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"parameter": "p6",
|
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"current_value": 4000.0,
|
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"units": "MilliMeter",
|
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"suggested_range": "\u00b120% of 4000.0 MilliMeter"
|
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},
|
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{
|
||||
"parameter": "p13",
|
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"current_value": 0.0,
|
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"units": "Degrees",
|
||||
"suggested_range": "\u00b120% of 0.0 Degrees"
|
||||
},
|
||||
{
|
||||
"parameter": "p19",
|
||||
"current_value": 4000.0,
|
||||
"units": "MilliMeter",
|
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"suggested_range": "\u00b120% of 4000.0 MilliMeter"
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},
|
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{
|
||||
"parameter": "p34",
|
||||
"current_value": 4000.0,
|
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"units": "MilliMeter",
|
||||
"suggested_range": "\u00b120% of 4000.0 MilliMeter"
|
||||
},
|
||||
{
|
||||
"parameter": "p50",
|
||||
"current_value": 4000.0,
|
||||
"units": "MilliMeter",
|
||||
"suggested_range": "\u00b120% of 4000.0 MilliMeter"
|
||||
},
|
||||
{
|
||||
"parameter": "p119",
|
||||
"current_value": 4000.0,
|
||||
"units": "MilliMeter",
|
||||
"suggested_range": "\u00b120% of 4000.0 MilliMeter"
|
||||
},
|
||||
{
|
||||
"parameter": "p130",
|
||||
"current_value": 10.0,
|
||||
"units": "",
|
||||
"suggested_range": "\u00b120% of 10.0 "
|
||||
},
|
||||
{
|
||||
"parameter": "p132",
|
||||
"current_value": 444.444444444444,
|
||||
"units": "MilliMeter",
|
||||
"suggested_range": "\u00b120% of 444.444444444444 MilliMeter"
|
||||
},
|
||||
{
|
||||
"parameter": "p134",
|
||||
"current_value": 4000.0,
|
||||
"units": "MilliMeter",
|
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"suggested_range": "\u00b120% of 4000.0 MilliMeter"
|
||||
},
|
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{
|
||||
"parameter": "p135",
|
||||
"current_value": 4000.0,
|
||||
"units": "MilliMeter",
|
||||
"suggested_range": "\u00b120% of 4000.0 MilliMeter"
|
||||
},
|
||||
{
|
||||
"parameter": "p137",
|
||||
"current_value": 1.0,
|
||||
"units": "",
|
||||
"suggested_range": "\u00b120% of 1.0 "
|
||||
},
|
||||
{
|
||||
"parameter": "p139",
|
||||
"current_value": 10.0,
|
||||
"units": "MilliMeter",
|
||||
"suggested_range": "\u00b120% of 10.0 MilliMeter"
|
||||
},
|
||||
{
|
||||
"parameter": "p141",
|
||||
"current_value": 0.0,
|
||||
"units": "MilliMeter",
|
||||
"suggested_range": "\u00b120% of 0.0 MilliMeter"
|
||||
},
|
||||
{
|
||||
"parameter": "p143",
|
||||
"current_value": 0.0,
|
||||
"units": "Degrees",
|
||||
"suggested_range": "\u00b120% of 0.0 Degrees"
|
||||
},
|
||||
{
|
||||
"parameter": "p173",
|
||||
"current_value": 973.968443678471,
|
||||
"units": "Kilogram",
|
||||
"suggested_range": "\u00b120% of 973.968443678471 Kilogram"
|
||||
}
|
||||
],
|
||||
"proposed_extractors": [
|
||||
{
|
||||
"action": "extract_displacement",
|
||||
"description": "Extract displacement results from OP2 file",
|
||||
"params": {
|
||||
"result_type": "displacement"
|
||||
}
|
||||
},
|
||||
{
|
||||
"action": "extract_solid_stress",
|
||||
"description": "Extract stress from CQUAD4 elements",
|
||||
"params": {
|
||||
"result_type": "stress",
|
||||
"element_type": "cquad4"
|
||||
}
|
||||
}
|
||||
],
|
||||
"proposed_objectives": [
|
||||
"max_displacement (minimize or maximize)",
|
||||
"max_von_mises (minimize for safety)"
|
||||
],
|
||||
"warnings": [],
|
||||
"errors": []
|
||||
}
|
||||
Reference in New Issue
Block a user