674 lines
21 KiB
Markdown
674 lines
21 KiB
Markdown
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Neural Field Data Parser: From NX Nastran Files to Training Data
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Complete Implementation Guide
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What You Have vs What You Need
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✅ What NX Nastran Gives You:
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Files Available:
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.sim - Simulation file with load/BC definitions
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.fem - Finite element model
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.prt - Part geometry
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.bdf/.dat - Nastran input deck (mesh, materials, loads, BCs)
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.op2 - Binary results (stress, displacement, strain)
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.f06 - ASCII results (human readable)
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.log - Solver log
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This is SUFFICIENT! The BDF contains everything about setup, OP2 contains all results.
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Step-by-Step Instructions for Manual Data Generation
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Step 1: Set Up Your Analysis in NX
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1. Create your geometry in NX
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2. Generate mesh (record statistics)
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3. Apply materials
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4. Define boundary conditions:
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- Fixed supports
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- Pinned constraints
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- Contact (if needed)
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5. Apply loads:
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- Forces
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- Pressures
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- Gravity
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6. Set up solution parameters
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7. Run analysis
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8. Ensure these files are generated:
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- model.bdf (or .dat)
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- model.op2
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- model.f06
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Step 2: Organize Your Files
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training_case_001/
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├── input/
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│ ├── model.bdf # Main input deck
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│ ├── model.sim # NX simulation file
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│ └── geometry.prt # Original geometry
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├── output/
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│ ├── model.op2 # Binary results
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│ ├── model.f06 # ASCII results
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│ └── model.log # Solver log
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└── metadata.json # Your manual annotations
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Python Parser Implementation
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Main Parser Script
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python"""
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neural_field_parser.py
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Parses NX Nastran files into Neural Field training data
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"""
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import json
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import numpy as np
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import h5py
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from pathlib import Path
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from datetime import datetime
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import hashlib
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# pyNastran imports
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from pyNastran.bdf.bdf import BDF
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from pyNastran.op2.op2 import OP2
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class NastranToNeuralFieldParser:
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"""
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Parses Nastran BDF/OP2 files into Neural Field data structure
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"""
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def __init__(self, case_directory):
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self.case_dir = Path(case_directory)
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self.bdf_file = self.case_dir / "input" / "model.bdf"
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self.op2_file = self.case_dir / "output" / "model.op2"
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# Initialize readers
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self.bdf = BDF(debug=False)
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self.op2 = OP2(debug=False)
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# Data structure
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self.neural_field_data = {
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"metadata": {},
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"geometry": {},
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"mesh": {},
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"materials": {},
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"boundary_conditions": {},
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"loads": {},
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"results": {}
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}
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def parse_all(self):
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"""
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Main parsing function
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"""
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print("Starting parse of Nastran files...")
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# Parse input deck
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print("Reading BDF file...")
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self.bdf.read_bdf(str(self.bdf_file))
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# Parse results
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print("Reading OP2 file...")
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self.op2.read_op2(str(self.op2_file))
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# Extract all data
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self.extract_metadata()
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self.extract_mesh()
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self.extract_materials()
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self.extract_boundary_conditions()
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self.extract_loads()
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self.extract_results()
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# Save to file
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self.save_data()
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print("Parse complete!")
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return self.neural_field_data
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def extract_metadata(self):
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"""
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Extract metadata and analysis info
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"""
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self.neural_field_data["metadata"] = {
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"version": "1.0.0",
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"created_at": datetime.now().isoformat(),
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"source": "NX_Nastran",
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"case_directory": str(self.case_dir),
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"analysis_type": self.op2.sol, # SOL 101, 103, etc.
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"title": self.bdf.case_control_deck.title.title if hasattr(self.bdf.case_control_deck, 'title') else "",
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"units": {
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"length": "mm", # You may need to specify this
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"force": "N",
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"stress": "Pa",
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"temperature": "K"
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}
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}
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def extract_mesh(self):
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"""
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Extract mesh data from BDF
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"""
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print("Extracting mesh...")
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# Nodes
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nodes = []
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node_ids = []
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for nid, node in sorted(self.bdf.nodes.items()):
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node_ids.append(nid)
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nodes.append(node.get_position())
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nodes_array = np.array(nodes)
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# Elements
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element_data = {
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"solid": [],
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"shell": [],
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"beam": [],
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"rigid": []
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}
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# Solid elements (TETRA, HEXA, PENTA)
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for eid, elem in self.bdf.elements.items():
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elem_type = elem.type
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if elem_type in ['CTETRA', 'CHEXA', 'CPENTA', 'CTETRA10', 'CHEXA20']:
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element_data["solid"].append({
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"id": eid,
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"type": elem_type,
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"nodes": elem.node_ids,
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"material_id": elem.mid,
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"property_id": elem.pid if hasattr(elem, 'pid') else None
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})
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elif elem_type in ['CQUAD4', 'CTRIA3', 'CQUAD8', 'CTRIA6']:
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element_data["shell"].append({
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"id": eid,
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"type": elem_type,
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"nodes": elem.node_ids,
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"material_id": elem.mid,
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"property_id": elem.pid,
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"thickness": elem.T() if hasattr(elem, 'T') else None
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})
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elif elem_type in ['CBAR', 'CBEAM', 'CROD']:
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element_data["beam"].append({
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"id": eid,
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"type": elem_type,
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"nodes": elem.node_ids,
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"material_id": elem.mid,
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"property_id": elem.pid
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})
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elif elem_type in ['RBE2', 'RBE3', 'RBAR']:
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element_data["rigid"].append({
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"id": eid,
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"type": elem_type,
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"nodes": elem.node_ids
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})
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# Store mesh data
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self.neural_field_data["mesh"] = {
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"statistics": {
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"n_nodes": len(nodes),
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"n_elements": len(self.bdf.elements),
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"element_types": {
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"solid": len(element_data["solid"]),
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"shell": len(element_data["shell"]),
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"beam": len(element_data["beam"]),
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"rigid": len(element_data["rigid"])
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}
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},
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"nodes": {
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"ids": node_ids,
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"coordinates": nodes_array.tolist(),
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"shape": list(nodes_array.shape)
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},
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"elements": element_data
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}
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def extract_materials(self):
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"""
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Extract material properties
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"""
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print("Extracting materials...")
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materials = []
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for mid, mat in self.bdf.materials.items():
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mat_data = {
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"id": mid,
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"type": mat.type
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}
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if mat.type == 'MAT1': # Isotropic material
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mat_data.update({
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"E": mat.e, # Young's modulus
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"nu": mat.nu, # Poisson's ratio
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"rho": mat.rho, # Density
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"G": mat.g, # Shear modulus
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"alpha": mat.a if hasattr(mat, 'a') else None, # Thermal expansion
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"tref": mat.tref if hasattr(mat, 'tref') else None,
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"ST": mat.St() if hasattr(mat, 'St') else None, # Tensile stress limit
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"SC": mat.Sc() if hasattr(mat, 'Sc') else None, # Compressive stress limit
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"SS": mat.Ss() if hasattr(mat, 'Ss') else None # Shear stress limit
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})
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materials.append(mat_data)
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self.neural_field_data["materials"] = materials
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def extract_boundary_conditions(self):
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"""
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Extract boundary conditions from BDF
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"""
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print("Extracting boundary conditions...")
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bcs = {
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"spc": [], # Single point constraints
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"mpc": [], # Multi-point constraints
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"suport": [] # Free body supports
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}
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# SPC (fixed DOFs)
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for spc_id, spc_list in self.bdf.spcs.items():
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for spc in spc_list:
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bcs["spc"].append({
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"id": spc_id,
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"node": spc.node_ids[0] if hasattr(spc, 'node_ids') else spc.node,
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"dofs": spc.components, # Which DOFs are constrained (123456)
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"enforced_motion": spc.enforced
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})
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# MPC equations
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for mpc_id, mpc_list in self.bdf.mpcs.items():
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for mpc in mpc_list:
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bcs["mpc"].append({
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"id": mpc_id,
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"nodes": mpc.node_ids,
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"coefficients": mpc.coefficients,
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"components": mpc.components
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})
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self.neural_field_data["boundary_conditions"] = bcs
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def extract_loads(self):
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"""
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Extract loads from BDF
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"""
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print("Extracting loads...")
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loads = {
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"point_forces": [],
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"pressure": [],
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"gravity": [],
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"thermal": []
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}
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# Point forces (FORCE, MOMENT)
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for load_id, load_list in self.bdf.loads.items():
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for load in load_list:
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if load.type == 'FORCE':
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loads["point_forces"].append({
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"id": load_id,
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"node": load.node,
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"magnitude": load.mag,
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"direction": [load.xyz[0], load.xyz[1], load.xyz[2]],
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"coord_system": load.cid
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})
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elif load.type == 'MOMENT':
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loads["point_forces"].append({
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"id": load_id,
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"node": load.node,
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"moment": load.mag,
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"direction": [load.xyz[0], load.xyz[1], load.xyz[2]],
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"coord_system": load.cid
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})
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elif load.type in ['PLOAD', 'PLOAD2', 'PLOAD4']:
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loads["pressure"].append({
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"id": load_id,
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"elements": load.element_ids,
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"pressure": load.pressure,
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"type": load.type
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})
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elif load.type == 'GRAV':
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loads["gravity"].append({
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"id": load_id,
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"acceleration": load.scale,
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"direction": [load.N[0], load.N[1], load.N[2]],
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"coord_system": load.cid
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})
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# Temperature loads
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for temp_id, temp_list in self.bdf.temps.items():
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for temp in temp_list:
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loads["thermal"].append({
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"id": temp_id,
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"node": temp.node,
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"temperature": temp.temperature
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})
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self.neural_field_data["loads"] = loads
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def extract_results(self):
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"""
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Extract results from OP2
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"""
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print("Extracting results...")
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results = {}
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# Get subcase ID (usually 1 for linear static)
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subcase_id = 1
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# Displacement
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if hasattr(self.op2, 'displacements'):
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disp = self.op2.displacements[subcase_id]
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disp_data = disp.data[0, :, :] # [itime=0, all_nodes, 6_dofs]
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results["displacement"] = {
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"node_ids": disp.node_gridtype[:, 0].tolist(),
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"data": disp_data.tolist(),
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"shape": list(disp_data.shape),
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"max_magnitude": float(np.max(np.linalg.norm(disp_data[:, :3], axis=1)))
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}
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# Stress - handle different element types
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stress_results = {}
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# Solid stress
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if hasattr(self.op2, 'ctetra_stress'):
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stress = self.op2.ctetra_stress[subcase_id]
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stress_data = stress.data[0, :, :]
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stress_results["solid_stress"] = {
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"element_ids": stress.element_node[:, 0].tolist(),
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"data": stress_data.tolist(),
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"von_mises": stress_data[:, -1].tolist() if stress_data.shape[1] > 6 else None
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}
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# Shell stress
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if hasattr(self.op2, 'cquad4_stress'):
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stress = self.op2.cquad4_stress[subcase_id]
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stress_data = stress.data[0, :, :]
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stress_results["shell_stress"] = {
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"element_ids": stress.element_node[:, 0].tolist(),
|
||
|
|
"data": stress_data.tolist()
|
||
|
|
}
|
||
|
|
|
||
|
|
results["stress"] = stress_results
|
||
|
|
|
||
|
|
# Strain
|
||
|
|
strain_results = {}
|
||
|
|
if hasattr(self.op2, 'ctetra_strain'):
|
||
|
|
strain = self.op2.ctetra_strain[subcase_id]
|
||
|
|
strain_data = strain.data[0, :, :]
|
||
|
|
strain_results["solid_strain"] = {
|
||
|
|
"element_ids": strain.element_node[:, 0].tolist(),
|
||
|
|
"data": strain_data.tolist()
|
||
|
|
}
|
||
|
|
|
||
|
|
results["strain"] = strain_results
|
||
|
|
|
||
|
|
# SPC Forces (reactions)
|
||
|
|
if hasattr(self.op2, 'spc_forces'):
|
||
|
|
spc = self.op2.spc_forces[subcase_id]
|
||
|
|
spc_data = spc.data[0, :, :]
|
||
|
|
results["reactions"] = {
|
||
|
|
"node_ids": spc.node_gridtype[:, 0].tolist(),
|
||
|
|
"forces": spc_data.tolist()
|
||
|
|
}
|
||
|
|
|
||
|
|
self.neural_field_data["results"] = results
|
||
|
|
|
||
|
|
def save_data(self):
|
||
|
|
"""
|
||
|
|
Save parsed data to JSON and HDF5
|
||
|
|
"""
|
||
|
|
print("Saving data...")
|
||
|
|
|
||
|
|
# Save JSON metadata
|
||
|
|
json_file = self.case_dir / "neural_field_data.json"
|
||
|
|
with open(json_file, 'w') as f:
|
||
|
|
# Convert numpy arrays to lists for JSON serialization
|
||
|
|
json.dump(self.neural_field_data, f, indent=2, default=str)
|
||
|
|
|
||
|
|
# Save HDF5 for large arrays
|
||
|
|
h5_file = self.case_dir / "neural_field_data.h5"
|
||
|
|
with h5py.File(h5_file, 'w') as f:
|
||
|
|
# Save mesh data
|
||
|
|
mesh_grp = f.create_group('mesh')
|
||
|
|
mesh_grp.create_dataset('node_coordinates',
|
||
|
|
data=np.array(self.neural_field_data["mesh"]["nodes"]["coordinates"]))
|
||
|
|
|
||
|
|
# Save results
|
||
|
|
if "results" in self.neural_field_data:
|
||
|
|
results_grp = f.create_group('results')
|
||
|
|
if "displacement" in self.neural_field_data["results"]:
|
||
|
|
results_grp.create_dataset('displacement',
|
||
|
|
data=np.array(self.neural_field_data["results"]["displacement"]["data"]))
|
||
|
|
|
||
|
|
print(f"Data saved to {json_file} and {h5_file}")
|
||
|
|
|
||
|
|
# ============================================================================
|
||
|
|
# USAGE SCRIPT
|
||
|
|
# ============================================================================
|
||
|
|
|
||
|
|
def main():
|
||
|
|
"""
|
||
|
|
Main function to run the parser
|
||
|
|
"""
|
||
|
|
import sys
|
||
|
|
|
||
|
|
if len(sys.argv) < 2:
|
||
|
|
print("Usage: python neural_field_parser.py <case_directory>")
|
||
|
|
sys.exit(1)
|
||
|
|
|
||
|
|
case_dir = sys.argv[1]
|
||
|
|
|
||
|
|
# Create parser
|
||
|
|
parser = NastranToNeuralFieldParser(case_dir)
|
||
|
|
|
||
|
|
# Parse all data
|
||
|
|
try:
|
||
|
|
data = parser.parse_all()
|
||
|
|
print("\nParsing successful!")
|
||
|
|
print(f"Nodes: {data['mesh']['statistics']['n_nodes']}")
|
||
|
|
print(f"Elements: {data['mesh']['statistics']['n_elements']}")
|
||
|
|
print(f"Materials: {len(data['materials'])}")
|
||
|
|
|
||
|
|
except Exception as e:
|
||
|
|
print(f"\nError during parsing: {e}")
|
||
|
|
import traceback
|
||
|
|
traceback.print_exc()
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
main()
|
||
|
|
|
||
|
|
Validation Script
|
||
|
|
python"""
|
||
|
|
validate_parsed_data.py
|
||
|
|
Validates the parsed neural field data
|
||
|
|
"""
|
||
|
|
|
||
|
|
import json
|
||
|
|
import h5py
|
||
|
|
import numpy as np
|
||
|
|
from pathlib import Path
|
||
|
|
|
||
|
|
class NeuralFieldDataValidator:
|
||
|
|
"""
|
||
|
|
Validates parsed data for completeness and consistency
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, case_directory):
|
||
|
|
self.case_dir = Path(case_directory)
|
||
|
|
self.json_file = self.case_dir / "neural_field_data.json"
|
||
|
|
self.h5_file = self.case_dir / "neural_field_data.h5"
|
||
|
|
|
||
|
|
def validate(self):
|
||
|
|
"""
|
||
|
|
Run all validation checks
|
||
|
|
"""
|
||
|
|
print("Starting validation...")
|
||
|
|
|
||
|
|
# Load data
|
||
|
|
with open(self.json_file, 'r') as f:
|
||
|
|
data = json.load(f)
|
||
|
|
|
||
|
|
# Check required fields
|
||
|
|
required_fields = [
|
||
|
|
"metadata", "mesh", "materials",
|
||
|
|
"boundary_conditions", "loads", "results"
|
||
|
|
]
|
||
|
|
|
||
|
|
for field in required_fields:
|
||
|
|
if field not in data:
|
||
|
|
print(f"❌ Missing required field: {field}")
|
||
|
|
return False
|
||
|
|
else:
|
||
|
|
print(f"✅ Found {field}")
|
||
|
|
|
||
|
|
# Validate mesh
|
||
|
|
n_nodes = data["mesh"]["statistics"]["n_nodes"]
|
||
|
|
n_elements = data["mesh"]["statistics"]["n_elements"]
|
||
|
|
|
||
|
|
print(f"\nMesh Statistics:")
|
||
|
|
print(f" Nodes: {n_nodes}")
|
||
|
|
print(f" Elements: {n_elements}")
|
||
|
|
|
||
|
|
# Check results consistency
|
||
|
|
if "displacement" in data["results"]:
|
||
|
|
disp_nodes = len(data["results"]["displacement"]["node_ids"])
|
||
|
|
if disp_nodes != n_nodes:
|
||
|
|
print(f"⚠️ Displacement nodes ({disp_nodes}) != mesh nodes ({n_nodes})")
|
||
|
|
|
||
|
|
# Check HDF5 file
|
||
|
|
with h5py.File(self.h5_file, 'r') as f:
|
||
|
|
print(f"\nHDF5 Contents:")
|
||
|
|
for key in f.keys():
|
||
|
|
print(f" {key}: {list(f[key].keys())}")
|
||
|
|
|
||
|
|
print("\n✅ Validation complete!")
|
||
|
|
return True
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
import sys
|
||
|
|
validator = NeuralFieldDataValidator(sys.argv[1])
|
||
|
|
validator.validate()
|
||
|
|
|
||
|
|
Step-by-Step Usage Instructions
|
||
|
|
1. Prepare Your Analysis
|
||
|
|
bash# In NX:
|
||
|
|
1. Create geometry
|
||
|
|
2. Generate mesh
|
||
|
|
3. Apply materials (MAT1 cards)
|
||
|
|
4. Apply constraints (SPC)
|
||
|
|
5. Apply loads (FORCE, PLOAD4)
|
||
|
|
6. Run SOL 101 (Linear Static)
|
||
|
|
7. Request output: DISPLACEMENT=ALL, STRESS=ALL, STRAIN=ALL
|
||
|
|
2. Organize Files
|
||
|
|
bashmkdir training_case_001
|
||
|
|
mkdir training_case_001/input
|
||
|
|
mkdir training_case_001/output
|
||
|
|
|
||
|
|
# Copy files
|
||
|
|
cp your_model.bdf training_case_001/input/model.bdf
|
||
|
|
cp your_model.op2 training_case_001/output/model.op2
|
||
|
|
cp your_model.f06 training_case_001/output/model.f06
|
||
|
|
3. Run Parser
|
||
|
|
bash# Install requirements
|
||
|
|
pip install pyNastran numpy h5py
|
||
|
|
|
||
|
|
# Run parser
|
||
|
|
python neural_field_parser.py training_case_001
|
||
|
|
|
||
|
|
# Validate
|
||
|
|
python validate_parsed_data.py training_case_001
|
||
|
|
4. Check Output
|
||
|
|
You'll get:
|
||
|
|
|
||
|
|
neural_field_data.json - Complete metadata and structure
|
||
|
|
neural_field_data.h5 - Large arrays (mesh, results)
|
||
|
|
|
||
|
|
|
||
|
|
Automation Script for Multiple Cases
|
||
|
|
python"""
|
||
|
|
batch_parser.py
|
||
|
|
Parse multiple cases automatically
|
||
|
|
"""
|
||
|
|
|
||
|
|
import os
|
||
|
|
from pathlib import Path
|
||
|
|
from neural_field_parser import NastranToNeuralFieldParser
|
||
|
|
|
||
|
|
def batch_parse(root_directory):
|
||
|
|
"""
|
||
|
|
Parse all cases in directory
|
||
|
|
"""
|
||
|
|
root = Path(root_directory)
|
||
|
|
cases = [d for d in root.iterdir() if d.is_dir()]
|
||
|
|
|
||
|
|
results = []
|
||
|
|
for case in cases:
|
||
|
|
print(f"\nProcessing {case.name}...")
|
||
|
|
try:
|
||
|
|
parser = NastranToNeuralFieldParser(case)
|
||
|
|
data = parser.parse_all()
|
||
|
|
results.append({
|
||
|
|
"case": case.name,
|
||
|
|
"status": "success",
|
||
|
|
"nodes": data["mesh"]["statistics"]["n_nodes"],
|
||
|
|
"elements": data["mesh"]["statistics"]["n_elements"]
|
||
|
|
})
|
||
|
|
except Exception as e:
|
||
|
|
results.append({
|
||
|
|
"case": case.name,
|
||
|
|
"status": "failed",
|
||
|
|
"error": str(e)
|
||
|
|
})
|
||
|
|
|
||
|
|
# Summary
|
||
|
|
print("\n" + "="*50)
|
||
|
|
print("BATCH PROCESSING COMPLETE")
|
||
|
|
print("="*50)
|
||
|
|
for r in results:
|
||
|
|
status = "✅" if r["status"] == "success" else "❌"
|
||
|
|
print(f"{status} {r['case']}: {r['status']}")
|
||
|
|
|
||
|
|
return results
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
batch_parse("./training_data")
|
||
|
|
|
||
|
|
What to Add Manually
|
||
|
|
Create a metadata.json in each case directory with design intent:
|
||
|
|
json{
|
||
|
|
"design_parameters": {
|
||
|
|
"thickness": 2.5,
|
||
|
|
"fillet_radius": 5.0,
|
||
|
|
"rib_height": 15.0
|
||
|
|
},
|
||
|
|
"optimization_context": {
|
||
|
|
"objectives": ["minimize_weight", "minimize_stress"],
|
||
|
|
"constraints": ["max_displacement < 2mm"],
|
||
|
|
"iteration": 42
|
||
|
|
},
|
||
|
|
"notes": "Baseline design with standard loading"
|
||
|
|
}
|
||
|
|
|
||
|
|
Troubleshooting
|
||
|
|
Common Issues:
|
||
|
|
|
||
|
|
"Can't find BDF nodes"
|
||
|
|
|
||
|
|
Make sure you're using .bdf or .dat, not .sim
|
||
|
|
Check that mesh was exported to solver deck
|
||
|
|
|
||
|
|
|
||
|
|
"OP2 has no results"
|
||
|
|
|
||
|
|
Ensure analysis completed successfully
|
||
|
|
Check that you requested output (DISP=ALL, STRESS=ALL)
|
||
|
|
|
||
|
|
|
||
|
|
"Memory error with large models"
|
||
|
|
|
||
|
|
Use HDF5 chunking for very large models
|
||
|
|
Process in batches
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
This parser gives you everything you need to start training neural networks on your FEA data. The format is future-proof and will work with your automated generation pipeline!
|