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_V2/1_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_V2/1_setup/model/export_field_dz.fld

@@ -0,0 +1,72 @@
+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] : [51] : [0]
+INDEP VAR: [node_id] : [] : [] : [5]
+BOUNDS: [3] : [YES] : [669] : [YES] : [51] : [655]
+DEP VAR: [x] : [Length] : [mm] : [0]
+DESCRIPTION: ResultProbe
+DESCRIPTION: dz
+DESCRIPTION: 21-Nov-25
+DESCRIPTION: 15:27:24
+START DATA
+0, 655, -0.0374058224260807
+0, 656, -0.038049004971981
+0, 657, -0.0369194410741329
+0, 658, -0.0365256853401661
+0, 659, -0.0362277515232563
+0, 660, -0.0421693958342075
+0, 661, -0.038899153470993
+0, 662, -0.040073998272419
+0, 663, -0.0356613844633102
+0, 664, -0.0356574058532715
+0, 665, -0.0358434692025185
+0, 666, -0.0357435494661331
+0, 667, -0.0360030345618725
+0, 668, -0.0356605499982834
+0, 669, -0.0356847979128361
+0, 3, -0.0459242127835751
+0, 6, -0.0459244512021542
+0, 14, -0.0356661044061184
+0, 11, -0.0356660187244415
+0, 128, -0.0374444201588631
+0, 129, -0.0381020344793797
+0, 130, -0.0369499586522579
+0, 131, -0.0365508943796158
+0, 132, -0.0362492613494396
+0, 133, -0.0389753989875317
+0, 134, -0.040153156965971
+0, 135, -0.0421142838895321
+0, 136, -0.0356643460690975
+0, 137, -0.0356617495417595
+0, 138, -0.0356673523783684
+0, 139, -0.0360213443636894
+0, 140, -0.0358589664101601
+0, 141, -0.0357562974095345
+0, 142, -0.0356945171952248
+0, 59, -0.0461513064801693
+0, 169, -0.0374445840716362
+0, 170, -0.0381022356450558
+0, 171, -0.0369501039385796
+0, 172, -0.0365510284900665
+0, 173, -0.0362493842840195
+0, 174, -0.0421144664287567
+0, 175, -0.040153443813324
+0, 176, -0.038975652307272
+0, 177, -0.0356644317507744
+0, 178, -0.0356618389487267
+0, 179, -0.0358590744435787
+0, 180, -0.0357564017176628
+0, 181, -0.0360214598476887
+0, 182, -0.0356946140527725
+0, 183, -0.0356674455106258
+0, 145, -0.0356633476912975
+END DATA