Summary Posprocessing - Types

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Summary Posprocessing - Types

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Motion

With this type of summary postprocessing  the output is the (absolute) maximum value at each stage of the motion in a global DOF over a component you nominate. The component can be a Pipe Section, a Line or a Cable. You use the Component Type drop-down list to define which, as shown in the figure below. You use the Name drop-down list to select the actual component of this type which is of interest – PipeLay presents you with a list of all components of this type as usual. A select all option is also provided on the list if you wish to quickly include all of the desired components.

Component for Motion

Component for Motion

 

By default your Motion output will be for the full length of the component you select. You can use the Length 1 and Length 2 slots to refine this. Length 1 specifies the start point of the area of interest on the component, and defaults to 0. Length 2 defines the end of the area of interest on the component, and defaults to the length of the component.

You use the Parameter drop-down list to nominate the global DOF of interest, as shown in the figure below; DOF 7 in this context refers to magnitude of rotation.

Motion Parameter

Motion Parameter

The remaining three options are common to all postprocessing types, and so the comments about them here apply to all subsequent types. For each parameter you add to summary postprocessing, you can optionally specify a scale factor to be applied to the data in both tabular and graphical output in the Summary Report File. You simply enter the factor in the Scale slot shown in Summary Postprocessing Tab figure. The default value is 1. Note that by default all data is in the same meaningful units as in files generated for example by automated postprocessing, so you will use this Scale option only infrequently.

By default each parameter you add to summary postprocessing is included in both tabular and graphical output in the Summary Report File. You can use the Plot drop-down list to suppress the creation of the plot. The options are Yes (the default) and No. The third and final option is Title; you can optionally use this to add a descriptive title to the parameter output in the Summary Report File. If you leave this slot blank, PipeLay automatically adds an appropriate title.

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Force

With this type the output is the maximum value at each stage of a restoring force, stress or strain over a component you nominate. All of the input options here are the same as for Motion, with the exception of Parameter. The parameter options for type Force are shown in the figure below, and are self-explanatory.

Force Parameter

Force Parameter

 

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Criteria

To request a plot of the value of a particular criterion for each installation stage you select the Criteria option from the Type drop-down list. When you do this, Length 1, Length 2 and Parameter are all disabled, but the previously-disabled Criteria and Location options are enabled. You use the Criteria drop-down list to select the criterion of interest, as shown in the figure below.

Criteria

Criteria

 

Note that the criterion here does not have to be the same as the criterion you actually nominated for individual stages. Finally, you use Location to identify where on the appropriate component you want the value of the parameter you specify.

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Advanced Output

The last summary postprocessing option is Advanced Output. This allows you to examine the variation in two parameters, to be described shortly. When this option is selected, the enabled options are Component Type and Name, which operate as before; Parameter, to select one of the two parameters; and Scale, Plot and Title, which are again the same as before.

The two options in Parameter are Vessel Position and Layback, as shown in the figure below.

Advanced Output Parameters

Advanced Output Parameters

 

Vessel Position is defined as the horizontal distance between the ends of the selected Pipe Section, Line or Cable component, with respect to the corresponding distance at the first analysis stage. So the first stage position is always assigned a value of zero, and the plot shows the change in position relative to this. For example, the Vessel Position will typically increase for each step in an abandonment analysis.

Advanced Output Parameter - Vessel Position

Advanced Output Parameter - Vessel Position

 

 

Finally, Lay Back is defined as the horizontal distance between the end of the selected Pipe Section, Line or Cable component on the vessel and the touchdown point, as shown in the figure below.

Advanced Output Parameter – Lay Back

Advanced Output Parameter – Lay Back

 

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