Vessel Motions Calculator v1

Price: £44.00 (£44.00 Inc. VAT)

Calculator for the motions of a vessel in waves

Subject

Vessel motions are generated by its response; i.e. transfer functions (RAOs), to passing waves.

Vessel motions are important for identifying loads imposed by a mass on or in a ship’s structure and/or its equipment such as:
a) seafastenings for transporting goods and equipment from port to port, and;
b) specifying and sizing equipment for offshore operations.

Calculator

The vessel accelerations calculator determines linear and rotary motions of a vessel using classical harmonic theory or DnV Rules for the Classification of Ships (January 2012).

Vessacc provides a calculation method for both of the above alternatives, giving you displacements, velocities and accelerations in 6 degrees of freedom at the ship's centre of gravity and at any point you specify on its structure.

For help using this calculator see Technical Help

Vessel Motions Calculator - Options

Classical Harmonic

Calculates the motions of a ship’s centre of gravity and any point (‘P’) on its structure according to classical harmonic theory using trigonometric projection. This calculation theory is best suited to offshore operations.

You enter	and the vessel motions calculator will provide:
Longitudinal position Latitudinal position Vertical position Angular wave velocity (encounter) Surge response amplitude Surge phase angle Roll response amplitude Roll phase angle Sway response amplitude Sway phase angle Pitch response amplitude Pitch phase angle Heave response amplitude Heave phase angle Yaw response amplitude Yaw phase angle encounter period angle through wave wave profile height	Surge @ CofG Sway @ CofG Heave @ CofG Surge vel @ CofG Sway vel @ CofG Heave vel @ CofG Surge acc @ CofG Sway acc @ CofG Heave acc @ CofG Roll @ CofG Pitch @ CofG Yaw @ CofG Roll vel @ CofG Pitch vel @ CofG Yaw vel @ CofG Roll acc @ CofG Pitch acc @ CofG Yaw vel @ CofG Surge @ 'P' Sway @ 'P' Heave @ 'P' Surge vel @ 'P' Sway vel @ 'P' Heave vel @ 'P' Surge acc @ 'P' Sway acc @ 'P' Heave acc @ 'P' Wave elevation @ CofG

You enter

and the vessel motions calculator will provide:

Longitudinal position
Latitudinal position
Vertical position
Angular wave velocity (encounter)
Surge response amplitude
Surge phase angle
Roll response amplitude
Roll phase angle
Sway response amplitude
Sway phase angle
Pitch response amplitude
Pitch phase angle
Heave response amplitude
Heave phase angle
Yaw response amplitude
Yaw phase angle
encounter period
angle through wave
wave profile height

Surge @ CofG
Sway @ CofG
Heave @ CofG
Surge vel @ CofG
Sway vel @ CofG
Heave vel @ CofG
Surge acc @ CofG
Sway acc @ CofG
Heave acc @ CofG
Roll @ CofG
Pitch @ CofG
Yaw @ CofG
Roll vel @ CofG
Pitch vel @ CofG
Yaw vel @ CofG
Roll acc @ CofG
Pitch acc @ CofG
Yaw vel @ CofG
Surge @ 'P'
Sway @ 'P'
Heave @ 'P'
Surge vel @ 'P'
Sway vel @ 'P'
Heave vel @ 'P'
Surge acc @ 'P'
Sway acc @ 'P'
Heave acc @ 'P'
Wave elevation @ CofG

DnV Rules for Ships

Calculates the motions of any point (‘P’) on a vessel’s structure according to DnV’s rules for ships. This calculation theory is most appropriate for port-to-port transit operations.

You enter:	and the vessel motions calculator will provide:
Longitudinal dimension Latitudinal dimension Vertical dimension Vessel velocity Vessel length Vessel beam Deck height Vessel draft Displacement Metacentric height factor Damping factor Roll acceleration factor Restricted service reduction	Common acceleration parameter Surge acceleration Sway-yaw acceleration Heave acceleration Period of roll Period of pitch Angle of roll Angle of pitch Tangential roll acceleration Tangential pitch acceleration Vertical roll acceleration Vertical pitch acceleration Vertical acceleration Transverse acceleration Longitudinal acceleration

Vessacc includes a data import facility from CalQlata's RAO calculator

Check minimum system requirements

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