Analysis Component

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Analysis Component

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The Analysis component is used to specify the various inputs for a PipeLay analysis. It allows you to gather together a set of components of various types (such as pipelines, vessels, waves etc.) from all of those defined in a project file, and to perform various types of analyses using them. In this example the Analysis component named ‘As-Laid Span Analysis’ is created in the Analysis folder. The following sections provide a description of the various inputs for the analysis.

 

Properties Tab

The Properties tab allows you to specify the various properties of a particular analysis. In this example the Model is selected as ‘Model’ and the Contact Modelling option is defined as Simple (Note: the latter input is actually irrelevant to this type of analysis as there are no rollerbox supports present).

 

Installation Stages Tab

The Installation Stages tab is where you actually define the various stages in your analysis. In this example there are three static stages, stages 1, 2 and 3.

 

Criteria Tab

On the Criteria tab, installation criteria are specified for each installation stage created on the Installation Stages tab. In this example, a tension criterion is required at the connection point ‘Seabed Connection’. Details of the Criteria are outlined in the table below with the tension values being defined as follows for each installation stage:

Between 100 kN and 101 kN in Stage 1

Between 150 kN and 151 kN in Stage 2

Between 200 kN and 201 kN in Stage 3

Table: Criteria Properties

Property

Value

Criteria

Tension

Component Name

Pipeline(1)

Location

End

Iterate On - Type

Fixed Connection Point

Iterate On - Name

Free End

Iterate On - Vector

Global Y

Tolerance – Max Iterations

1000

Tolerance – Max Adjustment

0.1

Tolerance – Min Adjustment

1E-5

Tolerance – Multi-Pass

Yes

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Summary Postprocessing Tab

You can use the Summary Postprocessing tab to request output from various parameters at crucial locations throughout the installation process. In this example, a number of parameters are selected for summary postprocessing, as detailed in the table below.

Table: Summary Postprocessing

Type

Component

Parameter

Criteria

Pipeline(1)

Tension - End

Criteria

Pipeline(1)

Tension - Start

Criteria

Pipeline(1)

Bending Stress - All

Criteria

Pipeline(1)

Von Mises Stress - All

 

Running the Analysis

We are now ready to run the analysis. While the analysis is running we can observe the analysis progress and check for warnings or errors by going to the Progress tab.

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