advanced structural and pipework analysis

FS-CMotion is a load processor for the generation of equivalent static structural loads resulting from the inertia forces and gravitational inclination forces developed from the type of motion associated with sea-going vessels. Forces due to the effects of heave, roll and pitch are accounted for.

A base load case is used to define the mass distribution within the structure. Forces in this load case are then converted into equivalent masses using a defined global gravitational constant.

The user defines the following input data that defines the motion of the vessel.

  • Heave Amplitude and Period
  • Roll Amplitude and Period
  • Pitch Amplitude and Period
  • Location of Centre of Roll - Y and Z co-ordinates define the model origin relative to the centre of Roll of the vessel.
  • Location of Centre of Pitch - Y and X co-ordinates define the model origin relative to the centre of Pitch of the vessel.

Generated Load Cases

When the program is activated the following eight load cases are generated.

StaticDynamic Heave
Static Roll
Heave/Static Roll
Static Pitch
Dynamic Pitch
Heave/Static Pitch

If motion amplitudes are specified as zero then load cases associated with that motion will not be created.

For each load case generated the total shear loads are shown.

Following analysis the results of the above load cases may be combined in the post-processor to give the structural load case combinations appropriate to the design requirements and the configuration of the vessel/structure.

Model Rotational Transforms - These are used to define the rotational orientation of the model relative to the vessel. With this facility it is not necessary to have the model and vessel in the same angular orientation.

Global Gravitational - This constant is used to convert forces in the definition load case to equivalent masses. This capability enables in-situ load cases to be used for motion analysis ie gravitational loads are converted to mass.