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---
name: orcaflex-modal-analysis-common-errors-and-fixes
description: 'Sub-skill of orcaflex-modal-analysis: Common Errors and Fixes (+1).'
version: 1.0.0
category: engineering
type: reference
scripts_exempt: true
---
# Common Errors and Fixes (+1)
## Common Errors and Fixes
| Error | Cause | Fix |
|-------|-------|-----|
| `Statics failed to converge` | Model not in equilibrium before modal | Fix statics first (see orcaflex-static-debug skill) |
| `Singular stiffness matrix` | Zero-tension lines or disconnected components | Check all lines have positive tension; verify all connections |
| `No modes found` | lastMode too low or model too simple | Increase `lastMode`; add more DOFs (finer segmentation) |
| Modal analysis hangs | Very large model with too many modes requested | Reduce `lastMode` or simplify model (coarser segments) |
| Unrealistic frequencies | Wrong units (mass, stiffness) or missing added mass | Verify line type properties; check hydrodynamic coefficients |
| Mode shapes all zero for an object | Object not included in modal analysis scope | Add object to `ObjectName` list in config |
| Duplicate frequencies | Symmetric model produces paired modes | Expected for symmetric configurations; modes are degenerate pairs |
## Debugging Modal Issues
```python
def diagnose_modal_failure(model):
"""Pre-check model before modal analysis."""
issues = []
# Check statics first
try:
model.CalculateStatics()
except OrcFxAPI.OrcaFlexError as e:
issues.append(f"Statics failed: {e} — fix statics before modal analysis")
*See sub-skills for full details.*
