feat: Add NX study models and optimization histories

Includes all study folders with NX models for development:
- bracket_stiffness_optimization (V1, V2, V3)
- drone_gimbal_arm_optimization
- simple_beam_optimization
- uav_arm_optimization (V1, V2)
- training_data_export_test
- uav_arm_atomizerfield_test

Contains .prt, .fem, .sim files and optimization databases.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

studies/bracket_stiffness_optimization/1_setup/model/export_displacement_field.py

@@ -0,0 +1,91 @@
+"""
+NX Journal - Export Displacement Field for Bracket Stiffness Analysis
+=====================================================================
+
+This journal exports the z-displacement field from a ResultProbe to a .fld file.
+
+Usage:
+    run_journal.exe export_displacement_field.py [sim_file_path]
+
+If sim_file_path is not provided, uses Bracket_sim1.sim in the same directory.
+"""
+
+import sys
+import math
+from pathlib import Path
+import NXOpen
+import NXOpen.CAE
+import NXOpen.Fields
+
+
+def main(args):
+    """
+    Export displacement field from NX simulation results.
+
+    Args:
+        args: Command line arguments, optionally including sim file path
+
+    The ResultProbe should already be defined in the simulation file
+    with z-displacement as the measured quantity.
+    """
+    theSession = NXOpen.Session.GetSession()
+
+    # Determine sim file to open
+    if len(args) > 0:
+        sim_file = Path(args[0])
+    else:
+        # Default: Bracket_sim1.sim in same directory as this journal
+        journal_dir = Path(__file__).parent
+        sim_file = journal_dir / "Bracket_sim1.sim"
+
+    if not sim_file.exists():
+        print(f"ERROR: Simulation file not found: {sim_file}")
+        return 1
+
+    # Open the simulation file
+    print(f"Opening simulation: {sim_file}")
+    try:
+        basePart1, partLoadStatus1 = theSession.Parts.OpenBaseDisplay(str(sim_file))
+        partLoadStatus1.Dispose()
+    except Exception as e:
+        print(f"ERROR: Failed to open simulation: {e}")
+        return 1
+
+    workSimPart = theSession.Parts.BaseWork
+    if workSimPart is None:
+        print("ERROR: No work part loaded after opening simulation.")
+        return 1
+
+    # Get the FieldManager
+    fieldManager = workSimPart.FindObject("FieldManager")
+    if fieldManager is None:
+        print("ERROR: FieldManager not found. Make sure simulation results are loaded.")
+        return 1
+
+    # Find the ResultProbe (should be pre-configured for z-displacement)
+    resultProbe = fieldManager.FindObject("ResultProbe")
+    if resultProbe is None:
+        print("ERROR: ResultProbe not found. Please create a ResultProbe for z-displacement.")
+        return 1
+
+    # Prepare probe array for export
+    probes = [NXOpen.CAE.ResultProbe.Null] * 1
+    probes[0] = resultProbe
+
+    # Determine output file path (same directory as this journal)
+    journal_dir = Path(__file__).parent
+    output_file = journal_dir / "export_field_dz.fld"
+
+    # Export to field file
+    print(f"Exporting displacement field to: {output_file}")
+    theSession.ResultManager.ExportProbesToFieldFile(probes, str(output_file))
+
+    print(f"[OK] Successfully exported displacement field")
+    print(f"  Output: {output_file}")
+
+    return 0
+
+
+if __name__ == '__main__':
+    exit_code = main(sys.argv[1:])
+    sys.exit(exit_code)

studies/bracket_stiffness_optimization/1_setup/model/export_field_dz.fld

@@ -0,0 +1,48 @@
+FIELD: [ResultProbe] : [TABLE]
+FIELD LOCK STATE: [NO]
+DUPLICATE_VALUE_OPTION: [0]
+PARAMETERIZE INDEPENDENT DOMAIN: [NO]
+PERSIST INTERPOL: [NO]
+CREATE INTERPOLATOR: [NO]
+FALLBACK DEFAULT INTERPOLATOR: [YES]
+INTERPOL: [4]
+VALUES OUTSIDE: [2]
+REMOVE DELAUNAY SLIVERS: [NO]
+INDEP VAR: [step] : [] : [] : [0]
+BOUNDS: [0] : [YES] : [0] : [YES] : [27] : [0]
+INDEP VAR: [node_id] : [] : [] : [5]
+BOUNDS: [4] : [YES] : [427] : [YES] : [27] : [421]
+DEP VAR: [x] : [Length] : [mm] : [0]
+DESCRIPTION: ResultProbe
+DESCRIPTION: dz
+DESCRIPTION: 21-Nov-25
+DESCRIPTION: 14:07:36
+START DATA
+0, 421, -0.0912187546491623
+0, 422, -0.0915937945246696
+0, 423, -0.0910566821694374
+0, 424, -0.0910213589668274
+0, 425, -0.0954395830631256
+0, 426, -0.0922631919384003
+0, 427, -0.0933739989995956
+0, 4, -0.0993421748280525
+0, 8, -0.0993418246507645
+0, 14, -0.0910348445177078
+0, 11, -0.0910348743200302
+0, 155, -0.0916455313563347
+0, 156, -0.0912557020783424
+0, 157, -0.0910805985331535
+0, 158, -0.0910358726978302
+0, 159, -0.0954336747527122
+0, 160, -0.0934799686074257
+0, 161, -0.0923400744795799
+0, 131, -0.091023251414299
+0, 122, -0.0910806134343147
+0, 123, -0.091255709528923
+0, 124, -0.0910359025001526
+0, 125, -0.0954337492585182
+0, 126, -0.0923400297760963
+0, 127, -0.0916455239057541
+0, 128, -0.0934799015522003
+0, 58, -0.0995271652936935
+END DATA