Individual skill

jax-modal-analysis

3D tetrahedral FEM modal analysis of a membrane STL. Takes a binary STL (mm units) + material properties JSON, repairs surface mesh, generates tetrahedral volume mesh via TetGen, assembles 3D stiffness/mass matrices with jax-fem, solves the generalised eigenvalue problem, and reports eigenfrequencies + mode shapes. Returns artifact JSON with eigenfrequencies_hz, eigenfrequencies_khz, modes_in_range, target_range_pass, and paths to summary PNG and CSV.

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Last checked: Nov 5, 2026

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Repository stars (not skill ratings): 251
Repository last updated: Oct 30, 2026
License: Apache-2.0

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# JAX 3D Modal Analysis

Full 3D tetrahedral FEM eigenvalue solver for ribbed membrane resonators.
Complements `fem-analysis` (2D Kirchhoff plate approximation) by accounting for
3D volumetric effects, frame stiffness, and out-of-plane deformation.

## Usage

```bash
python3 {baseDir}/scripts/jax_modal_analysis.py \
  --stl /path/to/membrane.stl \
  --material '{"E_Pa":3e9,"nu":0.35,"rho_kg_m3":1500}' \
  --num-modes 12 \
  --solver-backend jax-iterative \