DAVE.marine

Module Contents

DAVE.marine.GZcurve_DisplacementDriven(scene, vessel_node, displacement_kN=None, minimum_heel=0, maximum_heel=90, steps=180, teardown=True, allow_surge=False, allow_sway=False, allow_yaw=False, allow_trim=True, noplot=False, noshow=False)

This works for vessels without a parent.

The vessels slaved to an axis system and its heel angle is fixed and enforced. After solving statics the GZ curve is derived from the resulting moment on the connection.

The vessels heel and yaw are fixed. The vessel is free to heave, trim, and Only the vessels heel angle is fixed. The vessel is free to heave and trim.

Notes

The reported heel is relative to the initial equilibrium position of the vessel. So if the initial heel of the vessel is not zero (vessel not even keel) then the reported heel is the heel relative to that initial heel.

Parameters:

• scene – the scene

• vessel_node – the vessel node or vessel node name

• displacement_kN – displacement to be used (default value of 1 results in moment in kN*m instead of arm in m)

• curve (maximum_heel maximum heel, end of the) –

• curve –

• steps – number of steps (use un-even number to capture 0)

• teardown – remove the helper elements after the calculation

• allow_surge – (False)

• allow_sway – (False)

• allow_yaw – (False)

• allow_trim – (True)

• noplot – Do not plot results [False]

• noshow – Do plot but do not do plt.show() [False]

Returns:

dictionary with heel, moment, and GM

Also, it teardown is not selected, the DOFs for each of the displacements are stored in scene._gui_stability_dofs This is used by the Gui to make a movie of the stability calculation

DAVE.marine.GZcurve_MomentDriven()

Calculates the GZ curve by applying a heeling moment and calculating the resulting heel angle. This method allows for accurate calculation of the curve up till approximately the maximum of the curve.

• Where to apply moment (poi / body)

• Where to obtain roll (body)

• Where to get displacement from

Returns: