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Complete workflow for modal/frequency analysis - extract natural frequencies and mode shapes. Use for vibration analysis and resonance avoidance.
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npx skills add https://github.com/Cai-aa/CAE-Agent-Hub --skill abaqus-modal-analysisコマンドは1行のまま表示されます。コピー前に横へスクロールして全体を確認してください。
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Plan, create, adapt, and quality-audit coin-style five-block O-grid hexahedral meshes for cylindrical CAE models. Use for software-independent O-grid planning or implementation in a selected preprocessor, including requests mentioning 钱币原理、圆柱网格、中心正方形、顶点切到圆周、结构化六面体网格, mapped square-to-circle partitions, or HEX8 meshes. Includes a generic planner and an Abaqus/CAE execution adapter; do not claim automated support in another CAE application without a matching adapter or proved live native-tool path.
Workflow skill for two-stage sizing/parameter optimization on a CalculiX shell or beam deck via the optimize_structure tool — Latin Hypercube sweep plus coordinate descent to minimize mass subject to stress/displacement or natural-frequency constraints by tuning scalar section/material/load cards. Use when an agent must lighten a CalculiX shell or beam model while keeping stress and deflection within limits, or must thin a deck until its first modes clear a resonance floor (freq_1_hz constraint on a *FREQUENCY deck).
Use when: operating the standalone ansys-cfx-mcp CFX MCP leaf directly from generic clients or MCP hosts. Covers CFX-Pre, Solver, CFD-Post, cfx_workflow, cfx_model_context, run_code, validate_code, lifecycle actions, model context, named objects, API help, and result-file discovery.
| name | abaqus-modal-analysis |
| description | Complete workflow for modal/frequency analysis - extract natural frequencies and mode shapes. Use for vibration analysis and resonance avoidance. |
| allowed-tools | ["Read","Write","Edit","Glob","Grep","Bash(abaqus:*)","Skill"] |
Extract natural frequencies and mode shapes from a structure. Use for vibration analysis, resonance avoidance, and dynamic characterization.
Route here when user mentions:
Route elsewhere:
/abaqus-static-analysis/abaqus-dynamic-analysisBefore modal analysis:
Ask if unclear:
Route to /abaqus-geometry for part creation.
Route to /abaqus-material - density is essential.
Without density, Abaqus cannot compute the mass matrix and modal analysis will fail.
| Material | Density (tonne/mm^3) |
|---|---|
| Steel | 7.85e-9 |
| Aluminum | 2.7e-9 |
| Titanium | 4.5e-9 |
Route to /abaqus-mesh for meshing.
Mesh quality affects mode shapes - finer mesh gives more accurate high-frequency modes.
Route to /abaqus-bc to define support type.
| Configuration | Expected Modes | Use Case |
|---|---|---|
| Free-free (no BCs) | 6 rigid body modes at ~0 Hz, then elastic | Test correlation |
| Cantilever (one end fixed) | First mode is bending | Mounted component |
| Simply supported | Bending, plate modes | Bridge-like structures |
| Fixed-fixed | Higher frequencies than cantilever | Both ends constrained |
Note: Free-free analysis gives 6 modes at ~0 Hz (rigid body translation/rotation). Real elastic modes start at mode 7.
Route to /abaqus-step for FrequencyStep configuration.
Key decisions:
Route to /abaqus-job to submit, then /abaqus-odb to read frequencies from result frames.
| Parameter | Recommended | Notes |
|---|---|---|
| Eigensolver | LANCZOS | Best for most problems |
| numEigen | 10 | Start with first 10 modes |
| Normalization | DISPLACEMENT | Mode shapes max = 1 |
| Mesh size | Adequate for highest mode | Finer mesh for high frequencies |
After analysis, verify:
For cantilever beams, first mode can be verified analytically:
Compare FEA result to analytical for validation.
| Problem | Likely Cause | Solution |
|---|---|---|
| "Material has no density" | Density not defined | Add density to material |
| Negative eigenvalue | Unconstrained/unstable | Check BCs or add soft springs |
| 6 zero-frequency modes | Free-free (expected) | Real modes start at mode 7 |
| Frequencies too high/low | Unit error | Verify mm-tonne-s-N-MPa units |
| Memory error | Too many modes/elements | Reduce numEigen or coarsen mesh |
/abaqus-material - Must include density/abaqus-bc - Define modal boundary conditions/abaqus-step - FrequencyStep configuration/abaqus-odb - Extract frequencies and mode shapes/abaqus-geometry - Create geometry/abaqus-mesh - Mesh affects mode accuracyFor API syntax and code examples, see: