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fem-analysis

Modal analysis of a membrane STL using Kirchhoff plate FEM (scipy eigensolver). Takes a binary STL + material properties JSON, constructs a 2D rectangular FEM mesh, assembles stiffness and mass matrices, extracts the first N eigenfrequencies, and reports whether any mode falls in a target frequency range. Returns artifact JSON with eigenfrequencies_hz, mode_shapes_png, and target_range_pass.

skills/fem-analysis/SKILL.md

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Oct 30, 2026
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Apache-2.0

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# FEM Modal Analysis

Kirchhoff thin-plate finite element modal analysis for ribbed membrane resonators.

## Usage

```bash
python3 {baseDir}/scripts/modal_analysis.py \
  --stl /path/to/membrane.stl \
  --material '{"E_Pa":3e9,"nu":0.35,"rho_kg_m3":1500}' \
  --target-freq-min 2000 \
  --target-freq-max 8000 \
  --output /tmp/fem_results.json
```