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calculix-modal-analysis

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Workflow skill for CalculiX modal analysis (*FREQUENCY steps) — natural frequencies and mode shapes via the CalculiX MCP. read_results returns the frequency table; export_results with mode=N renders that mode shape in the browser viewer. Use when an agent must extract natural frequencies, check resonance margins, or visualize mode shapes on an open-source solver.

Skill/calculix/calculix-modal-analysis/SKILL.md

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# CalculiX Modal Analysis

Free-vibration eigenanalysis on a CalculiX deck: a `*FREQUENCY` step requests N
eigenpairs; ccx prints the eigenvalue table and per-mode eigenvectors to the
`.dat`, so both frequencies and mode shapes parse from text (no `.frd` needed).

## When to Use

Use when an agent must extract natural frequencies, check resonance/vibration
margins, or visualize mode shapes on a CalculiX model. Driven by the same MCP
tools as static runs (`run_solver` → `read_results` → `export_results`).

Not for: static stress/deflection (use `calculix-fem`), transient/dynamic
response (not yet supported), or sizing optimization (`calculix-sizing-optimization`).
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