shipshape 0.4.0

Open-source parametric vessel design and validation library

shipshape

Open-source parametric vessel design and validation library.

Shipshape provides boat-design-independent tools for naval engineering analysis. It is used by Solar Proa CAD but can be applied to any parametric vessel design.

Modules

Module	Description	Requires FreeCAD
parameter	Merge base parameters and compute derived values via a project-supplied plugin	No
mass	Compute component masses from a FreeCAD design and material properties	Yes
buoyancy	Find equilibrium pose (sinkage, pitch, roll) using Newton-Raphson iteration	Yes
gz	Compute the GZ righting-arm curve over a range of heel angles	Yes
physics	Center-of-gravity and center-of-buoyancy calculations	Yes
validate_structure	Structural validation: aka, mast, spine, brace, gunwale, wave slam, capsize analysis	No

Installation

pip install shipshape

For modules that require FreeCAD geometry (mass, buoyancy, gz, physics), install FreeCAD via conda-forge:

conda install -c conda-forge freecad

For diagram generation (validate_structure plots):

pip install shipshape[diagrams]

CLI Usage

Each module can be run as a CLI tool via python -m shipshape.<module>.

parameter

Merges boat and configuration JSON files, then calls a project-supplied compute_derived() function to calculate derived values.

PYTHONPATH=. python -m shipshape.parameter \
    --compute myproject.parameter.compute \
    --boat constants/boats/boat.json \
    --configuration constants/configurations/config.json \
    --output artifact/parameters.json

The --compute argument is a dotted module path. The module must export a compute_derived(data: dict) -> dict function.

mass

python -m shipshape.mass \
    --design artifact/boat.design.FCStd \
    --materials constants/material/materials.json \
    --output artifact/boat.mass.json

buoyancy

python -m shipshape.buoyancy \
    --design artifact/boat.design.FCStd \
    --materials constants/material/materials.json \
    --output artifact/boat.buoyancy.json

gz

python -m shipshape.gz \
    --design artifact/boat.design.FCStd \
    --buoyancy artifact/boat.buoyancy.json \
    --output artifact/boat.gz.json \
    --output-png artifact/boat.gz.png

validate_structure

python -m shipshape.validate_structure \
    --parameters artifact/parameters.json \
    --mass artifact/boat.mass.json \
    --gz artifact/boat.gz.json \
    --output artifact/boat.validation.json

License

MIT