Add GigaBIT M1 frame stiffness characterization project
- 3 studies: sensitivity (Method D), stiffness sweep (Method B), robustness - Atomizer specs with run matrices, Zernike annular OPD extractor - War-room validated hybrid B+D method
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# Study 01 — Sensitivity Map (Method D)
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**Type:** Parametric — Prescribed Unit Displacements
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**Runs:** 12 (9 unique @ 60° + 1 baseline + 2 spot checks @ 40°)
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**Model:** Enforced displacement BCs with expression control
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## What This Does
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Applies +1 μm displacement at each unique interface point in each global DOF direction, one at a time. Measures ΔWFE to build a sensitivity matrix: **nm WFE per μm displacement per DOF per point.**
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This is the PRIMARY deliverable for StarSpec.
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## .sim Setup Required
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1. Create 9 NX expressions: `dV1_X, dV1_Y, dV1_Z, dV2_X, dV2_Y, dV2_Z, dL1_X, dL1_Y, dL1_Z` (all default = 0)
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2. Apply enforced displacement BCs on all 5 support nodes referencing these expressions
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3. Symmetry ties: V_right X = −dV2_X, L_right X = −dL1_X; Y/Z same sign as left counterpart
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4. Gravity load at target elevation (60° or 40°)
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## Extractor
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Zernike annular OPD: 50 modes, J5+ filtered, inner_radius = 135.75 mm, reference subcase = 20° elevation.
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**Also extract individually:** J9, J10 (trefoil) and J11 (spherical) for secondary reporting.
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## Output
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Sensitivity matrix → feed into displacement limits and StarSpec deliverable.
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{
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"meta": {
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"version": "2.0",
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"created": "2026-03-04T12:00:00Z",
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"modified": "2026-03-04T12:00:00Z",
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"created_by": "mario",
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"modified_by": "mario",
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"study_name": "01_sensitivity_method_d",
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"description": "Method D — Unit displacement sensitivity map. Apply +1 μm prescribed displacement at each unique interface point (3 points × 3 DOF = 9 runs), extract Zernike WFE sensitivity coefficients. Uses symmetry: V_left≡V_right, L_left≡L_right.",
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"tags": ["mirror", "zernike", "sensitivity", "frame-stiffness", "parametric"]
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},
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"model": {
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"sim": {
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"path": "ASSY_M1_assyfem1_sim1.sim",
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"solver": "nastran",
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"_note": "UPDATE: Set correct .sim filename after model drop"
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},
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"nx_settings": {
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"nx_install_path": "C:\\Program Files\\Siemens\\NX2506",
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"simulation_timeout_s": 600,
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"_note": "UPDATE: Adjust NX path for your machine if different"
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}
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},
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"design_variables": [
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{
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"id": "dv_001",
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"name": "dV1_X",
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"expression_name": "dV1_X",
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"type": "continuous",
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"bounds": {"min": 0.0, "max": 0.001},
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"baseline": 0.0,
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"units": "mm",
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"enabled": true,
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"description": "V_top displacement in global X (0 = fixed, 0.001 = +1 μm)"
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},
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{
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"id": "dv_002",
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"name": "dV1_Y",
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"expression_name": "dV1_Y",
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"type": "continuous",
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"bounds": {"min": 0.0, "max": 0.001},
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"baseline": 0.0,
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"units": "mm",
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"enabled": true,
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"description": "V_top displacement in global Y"
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},
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{
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"id": "dv_003",
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"name": "dV1_Z",
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"expression_name": "dV1_Z",
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"type": "continuous",
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"bounds": {"min": 0.0, "max": 0.001},
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"baseline": 0.0,
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"units": "mm",
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"enabled": true,
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"description": "V_top displacement in global Z (optical axis)"
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},
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{
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"id": "dv_004",
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"name": "dV2_X",
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"expression_name": "dV2_X",
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"type": "continuous",
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"bounds": {"min": 0.0, "max": 0.001},
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"baseline": 0.0,
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"units": "mm",
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"enabled": true,
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"description": "V_side (left) displacement in global X"
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},
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{
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"id": "dv_005",
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"name": "dV2_Y",
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"expression_name": "dV2_Y",
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"type": "continuous",
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"bounds": {"min": 0.0, "max": 0.001},
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"baseline": 0.0,
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"units": "mm",
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"enabled": true,
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"description": "V_side (left) displacement in global Y"
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},
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{
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"id": "dv_006",
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"name": "dV2_Z",
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"expression_name": "dV2_Z",
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"type": "continuous",
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"bounds": {"min": 0.0, "max": 0.001},
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"baseline": 0.0,
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"units": "mm",
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"enabled": true,
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"description": "V_side (left) displacement in global Z"
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},
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{
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"id": "dv_007",
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"name": "dL1_X",
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"expression_name": "dL1_X",
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"type": "continuous",
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"bounds": {"min": 0.0, "max": 0.001},
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"baseline": 0.0,
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"units": "mm",
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"enabled": true,
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"description": "L_side (left) displacement in global X"
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},
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{
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"id": "dv_008",
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"name": "dL1_Y",
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"expression_name": "dL1_Y",
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"type": "continuous",
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"bounds": {"min": 0.0, "max": 0.001},
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"baseline": 0.0,
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"units": "mm",
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"enabled": true,
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"description": "L_side (left) displacement in global Y"
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},
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{
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"id": "dv_009",
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"name": "dL1_Z",
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"expression_name": "dL1_Z",
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"type": "continuous",
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"bounds": {"min": 0.0, "max": 0.001},
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"baseline": 0.0,
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"units": "mm",
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"enabled": true,
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"description": "L_side (left) displacement in global Z"
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}
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],
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"extractors": [
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{
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"id": "ext_001",
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"name": "Zernike Annular OPD — WFE Sensitivity",
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"type": "zernike_opd",
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"builtin": true,
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"config": {
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"inner_radius_mm": 135.75,
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"outer_radius_mm": 500.0,
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"n_modes": 50,
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"filter_low_orders": 4,
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"displacement_unit": "mm",
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"reference_subcase": 2,
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"_note": "J5+ filtered RMS. reference_subcase=2 is 20° elevation. Check subcase numbering in your model."
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},
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"outputs": [
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{
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"name": "rel_filtered_rms_40_vs_20",
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"metric": "filtered_rms_nm"
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},
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{
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"name": "rel_filtered_rms_60_vs_20",
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"metric": "filtered_rms_nm"
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}
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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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"id": "obj_001",
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"name": "ΔWFE at 60° (primary — worst case)",
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"direction": "minimize",
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"weight": 1.0,
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"source": {
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"extractor_id": "ext_001",
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"output_name": "rel_filtered_rms_60_vs_20"
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},
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"target": 1.0,
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"units": "nm",
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"_note": "This is a parametric study, not optimization. Objective is for tracking only."
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}
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],
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"constraints": [],
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"optimization": {
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"algorithm": {
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"type": "GridSampler",
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"config": {
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"_note": "GridSampler for deterministic parametric sweep. Each run is a specific point in the design matrix."
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}
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},
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"budget": {
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"max_trials": 12
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},
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"_run_matrix_note": "Override with explicit trial list below. Each trial activates exactly ONE displacement expression = 0.001, rest = 0."
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},
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"run_matrix": {
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"_description": "Explicit trial definitions for Method D. Each row is one FEA run. Atomizer sets these expression values before solving.",
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"trials": [
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{"trial": 0, "label": "baseline_all_fixed", "dV1_X": 0, "dV1_Y": 0, "dV1_Z": 0, "dV2_X": 0, "dV2_Y": 0, "dV2_Z": 0, "dL1_X": 0, "dL1_Y": 0, "dL1_Z": 0, "elevation": "60"},
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{"trial": 1, "label": "V_top_Z", "dV1_X": 0, "dV1_Y": 0, "dV1_Z": 0.001, "dV2_X": 0, "dV2_Y": 0, "dV2_Z": 0, "dL1_X": 0, "dL1_Y": 0, "dL1_Z": 0, "elevation": "60"},
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{"trial": 2, "label": "V_top_X", "dV1_X": 0.001, "dV1_Y": 0, "dV1_Z": 0, "dV2_X": 0, "dV2_Y": 0, "dV2_Z": 0, "dL1_X": 0, "dL1_Y": 0, "dL1_Z": 0, "elevation": "60"},
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{"trial": 3, "label": "V_top_Y", "dV1_X": 0, "dV1_Y": 0.001, "dV1_Z": 0, "dV2_X": 0, "dV2_Y": 0, "dV2_Z": 0, "dL1_X": 0, "dL1_Y": 0, "dL1_Z": 0, "elevation": "60"},
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{"trial": 4, "label": "V_side_Z", "dV1_X": 0, "dV1_Y": 0, "dV1_Z": 0, "dV2_X": 0, "dV2_Y": 0, "dV2_Z": 0.001, "dL1_X": 0, "dL1_Y": 0, "dL1_Z": 0, "elevation": "60"},
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{"trial": 5, "label": "V_side_X", "dV1_X": 0, "dV1_Y": 0, "dV1_Z": 0, "dV2_X": 0.001, "dV2_Y": 0, "dV2_Z": 0, "dL1_X": 0, "dL1_Y": 0, "dL1_Z": 0, "elevation": "60"},
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{"trial": 6, "label": "V_side_Y", "dV1_X": 0, "dV1_Y": 0, "dV1_Z": 0, "dV2_X": 0, "dV2_Y": 0.001, "dV2_Z": 0, "dL1_X": 0, "dL1_Y": 0, "dL1_Z": 0, "elevation": "60"},
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{"trial": 7, "label": "L_side_Z", "dV1_X": 0, "dV1_Y": 0, "dV1_Z": 0, "dV2_X": 0, "dV2_Y": 0, "dV2_Z": 0, "dL1_X": 0, "dL1_Y": 0, "dL1_Z": 0.001, "elevation": "60"},
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{"trial": 8, "label": "L_side_X", "dV1_X": 0, "dV1_Y": 0, "dV1_Z": 0, "dV2_X": 0, "dV2_Y": 0, "dV2_Z": 0, "dL1_X": 0.001, "dL1_Y": 0, "dL1_Z": 0, "elevation": "60"},
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{"trial": 9, "label": "L_side_Y", "dV1_X": 0, "dV1_Y": 0, "dV1_Z": 0, "dV2_X": 0, "dV2_Y": 0, "dV2_Z": 0, "dL1_X": 0, "dL1_Y": 0.001, "dL1_Z": 0, "elevation": "60"},
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{"trial": 10, "label": "spot_check_40_top1", "dV1_X": 0, "dV1_Y": 0, "dV1_Z": 0.001, "dV2_X": 0, "dV2_Y": 0, "dV2_Z": 0, "dL1_X": 0, "dL1_Y": 0, "dL1_Z": 0, "elevation": "40", "_note": "Repeat top sensitive DOF at 40° — UPDATE label after ranking"},
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{"trial": 11, "label": "spot_check_40_top2", "dV1_X": 0, "dV1_Y": 0, "dV1_Z": 0, "dV2_X": 0, "dV2_Y": 0, "dV2_Z": 0.001, "dL1_X": 0, "dL1_Y": 0, "dL1_Z": 0, "elevation": "40", "_note": "UPDATE after ranking"}
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]
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}
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}
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