A5 GeniE Cargo Rail

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DNV Software GeniE Cargo Rail Workshop

Revised 12 March 2011

Modelling in GeniE

SESAM User Course in Curved Structure Modelling

Genie Workshop:

Local model of cargo rail

The purpose of this workshop is to create a model intended for stress analysis of a cargorail on a floating vessel.

The focus is primarily on making the structureand not the loads nor detailed mesh control.

There are four loadcases covering selfweight,

wet surface loads and a combination.

It is assumed that the user is familiar withstructure modelling (beams and plates using snap

to point modelling techniques). Furthermore, it is

required that the user has basic knowledge on

GeniEs user interface and how the user may

interact with the model to derive necessary

information (such as length, positions, properties,

display settings and so on).

Some detailed guidance is given in the

beginning of the tutorial to exemplify how

to work with GeniE

The workshop is also accompanied with input filesfor GeniE (Journal file)

You need to make mesh and run analysis to

see results

This workshop should be viewed on-line or oncolour print out to best see the property colour

coding.

All pictures have been created using paperbackground

Default viewing settings have been modified

The structural data as well as the loads are fictitious

This tutorial has been made with GeniE versionD5.3-06 (March 2011) it may be that you need

this or a later version to complete this workshop

Part 0 - General


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Modelling in GeniE

Part 0 General introduction to the workshopPages 1 - 3

Part 1 Design premiseDefine the units, material, section types and thicknesses. Import data from library files.

Pages 4 - 8

Part 2 Guiding geometryDefine the guiding geometry needed to define the outer hull and deck levels.

Pages 9 - 12

Part 3 Web framesModel the web frames interactively.

Pages 13 - 20 Part 4 Hull

Create the hull

Page 21 - 22

Part 5 DecksCreate the decks

Page 23 - 24

Part 6 Cargo railCreate the cargo rail structure

Pages 25 - 30 Part 7 Copy the section

Extend the model by copying the modelled section

Pages 31

Part 8 Mirror the modelMirror the model to create the complete model

Pages 32

Part 9 Named setsCreate named sets

Pages 33 34 Part 10 Boundary conditions

Create boundary conditions

Pages 35

Part 11 Loads and loadcasesCreate surface loads on wet surfaces and make a combination of loadcases

Pages 36 39

Part 0 - General


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Modelling in GeniE

Part 12 Run analysisRun the analysis and see how the mesh and results changes when performing changes in the

global mesh settings.

Learn how to work with sets in results presentation and open the results in Xtract

Pages 40

Part 13 Results presentationPresent the results in various ways. Learn to work with sets in results presentation and open

the results in Xtract

Pages 41 - 42

Part 0 - General


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Modelling in GeniE

Define units meters and N

Start the program and open a new workspace File | New Workspace. Specify nameCargo_rail_tutorial and use the default values for database units. Click OK when

done.

Notice, if you want FE results in other units than N and m, you need tochange now.

Define materials

Use the command Edit | Properties and select Material. Select Create/Edit Material

to give the details for St52 (remember to tick Allow edit). Set the material type to

default and click OK when done.

Part 1 Design premise


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Modelling in GeniE

Define section properties All sections except the rails are to be imported from a library.

Use the command Edit|Properties and select Section. Select Create/Edit section to

start defining the sections. Select Section Library.

Find the right section library from Browse and select the library with default path

C:\Program Files\DNVS\GeniE\Libraries\bulb.xml (a library containing some

typical ship profiles). Change the filter type to see the file in the directory.



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Modelling in GeniE

Filter and select the sections as shown. Click Apply to import.

Use the Name Match filter and add the following sections:

HPbulb300x11x43x13x13, Fbar150x12, Fbar300x20.

Still in Create/Edit Cross Section select the Pipe tab and manually create a pipe

profile called Rails using d=0.2m and t=0.1m.



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Modelling in GeniE

Define plate thicknesses Click Edit|Properties

and select Thickness.

Click Create/Edit Thickness

and define the thicknesses

shown in the table.

Set default property to HPbulb200x10x28x8x8, default material to St52 and defaultthickness to Th08.


Name Thickness

Th09 0.009m

Th10 0.010m

Th11 0.011m

Th12 0.012m

Th13 0.013m

Th15 0.015m

Th20 0.020m


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Modelling in GeniE

Define a default global mesh density

Click the Edit | Properties | Mesh Property tab and use Create/Edit Mesh Property todefine a mesh density of 0.7m. Select the mesh property afterwards and click the Set

Global Default button.



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Insert a guiding plane

Use Insert | Guiding Geometry | Guide Plane Dialog and enter the values as shown.

Make a copy of the guiding plane by transforming it 20m in x-direction. First select

the guiding plane, then RMB to Copy and fill in the Translation Vector.

Part 2 Guiding geometry


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Select Insert | Guiding Geometry | Poly Curve, then select five points on

GuidePlane1 in the shown order to create a guiding curve for the hull.

Select Insert | Guiding Geometry | Guide Line and create two straight curves.

Part 2 Guiding geometry

1

2

3

4 & 5

Click same

point twiceto endinput

1

2 1

2

+


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Select the three guiding curves and use RMB to Cover Curves. This will create a

plate inside the curves.

To create stiffeners first transform the mid ship guide line 0.7m in y-direction. Then

create a single beam using Insert | Beam | Straight Beam Dialog menu using the

guide end points as end points for the new beam. Make sure the beam is correctly

oriented and flushed, see figure on next page. Changes area made by selecting the

beam and RMB to Edit Beam and the Local System and Offset Vectors menus. Make

sure current section is set to HPbulb200x10x28x8x8 and current material to St52

before creating the beam.

Part 3 Web frames


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Modelling in GeniE

Translate copies with equal spacing of 0.7m nine times along the plate in y-direction.

Part 3 Web frames

To be deleted


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Modelling in GeniE

Delete the beam along the guide plane spacing line, see previous figure.

Create a single beam along the rightmost guide plane spacing line. Then make twocopies by translating with equal spacing of 0.5 m in y-direction. Delete the single

beam. Alternatively you can copy the rightmost existing beam 1.2m in y-direction

first.

Select one of the two beams that extend outside the plate at the fillet, RMB and

select use Divide to split it at the fillet curve. Delete the small beam that have been

cut off before proceeding.

Both beams should be

divided.

Part 3 Web frames


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Modelling in GeniE

Select both the guiding plane and the plate and use RMB to make a copy by

translating them 5m in x-direction. The figure below shows the preview.

Select the new guiding plane and the plate and press ALT-S to show selection only

as visible. Alternatively use RMB to see Visible Model options.

Part 3 Web frames


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Select the plate and RMB to

divide the plate using planes

through the guide plate points.

Part 3 Web frames


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After you have done this, only the shown plates should be kept. Delete the other plates.

Now it should look like this.


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Modelling in GeniE

Define two cut-out profiles using Tools | Structure | Punch | New Profile as shown.

Part 3 Web frames


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Punch the hole in the web frame using Tools | Structure | Punch.

Repeat the punch process using the Manhole profile for three different profile start y-

positions: 6.6m, 4.5m, 2.5m and 1.0m.

Part 3 Web frames


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Modelling in GeniE

Create Fbar150x12 beams by using Insert | Beams | Straight Beam Dialoge. First

click some points on the guiding plane and then edit the y-coordinate before hitting

apply. Either type in the coordinate directly or let GeniE calculate the value. Create

five beams acccoring to the measures in the figure. Orient and flush the beams.

Part 3 Web frames


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Repeat creating beams according to the figure.

Part 3 Web frames


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Copy or mirror the second web frame to the opposite side of the first web frame.

Part 3 Web frames


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Modelling in GeniE

Create the hull by skinning curves. Open up Help | Help Topics and search for the wordsskin curves. Follow the example there to make the hull look like below.

Hint: If your model lacks guiding curves to skin, you can copy them from elsewhere

or you can double-click a plate, then select the edge you need and then RMB to

Create Model Curve. Double-click again to go back to normal display mode.

The hull is 13mm thick.

Part 4 Hull


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Modelling in GeniE

Update the thicknesses according to the figure. Select a plate and then click RMB

and go to Properties where you first click on the desired thickness and then OK.

Part 4 Hull


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Modelling in GeniE

Create decks using Insert | Plate | Flat Plate. Create a plate by clicking on four corner

points. Note the stiffener plates under deck in the first figure. Remember to set the

default thickness before creating a plate, see thicknesses shown below.

Repeat this process until all plates are defined.

Part 5 Decks

3

4

2

1


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Modelling in GeniE

Create deck stifffeners (shown in yellow) with spacing matching existing beams

using the HPbulb200x9x28x8x8 cross section for both middle and lower deck and

hull. Insert a single beam first and then translate copies.

Create deck stiffeners (shown in blue) with equal spacing of 0.7m in y-direction.

Verify orientation and flush before proceeding.

Part 5 Decks


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Modelling in GeniE

Create guiding curves and sweep plates by using Insert | Plate | Sweep Curves Dialog

to create the deck and wall structure shown in the figure.

Part 6 Cargo rail


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Modelling in GeniE

Now create three different profiles called Door, Windows and Winbdow2 for

punching cut-outs. You can either use Tools | Structure | Punch | New Profile or

Insert | Profile to open the new profile dialoge. Alternatively you can construct

guiding curves (see next pages for postions) and use Tools | Structure | Curve Punch

instead. Make sure you try out both alternatives.

Part 6 Cargo rail


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Modelling in GeniE

Create rail beams for a crane on the top of the structure using the Rails cross section.

Set Rails to default property and use the Straight Beam icon (at the very left of the

toolbar), then click the end points.

Alternatively you can set the default properties at the bottom of the GUIusing the Defaults tab.

Part 6 Cargo rail


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Modelling in GeniE

Create three 8 mm thick and 0.35 m wide stiffener panels at the end of the section by

first creating guide lines and then using Insert | Plate | Sweep Curves Dialog. Inside

the dialog select a guide curve and then click two points to define a vector that you

modify before hitting apply.

Part 6 Cargo rail

1

2


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Modelling in GeniE

Remove the hull from the display by selecting it and pressing ALT + Minus. Then

copy the previously created stiffener plates with a spacing of 0.7m in x-direction all

along the section. See the preview below.

Part 6 Cargo rail


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Modelling in GeniE

Copy the section once to extend the model. Use the Select Touching icon to selecteverything except the entities at the end, then RMB and Copy | Translate. The translation

vector should be the length of the section, i.e. 10m in x-direction.

Part 7 Copy the section


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Mirror the two sections to complete the model. Use the Select Touching icon to selecteverything except the entities at the mirror plane, then RMB and Copy | Mirror. The point

in the mirror plane should be a point in the y=0 plane and the mirror plane normal vector

can be 0 1 0.

Part 8 Mirror the model


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Modelling in GeniE

Create the following named sets by first selecting the entities and then RMB to NamedSet The first set to create is called Complete and should contain the whole model.

The named sets are also accessible from the tree structure at the bottom under

Utilities. Here you can use the visible model options on RMB i.e. ALT+S to view

only the selected set. If you want to use the sets when viewing results in other

programs than GeniE the names should be max. 8 characters. You may also insert

selected structure into existing sets

Named set BL_Tanktop and NWT_frame

Part 9 Named sets


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Named set WT_frame

Named set Cargo_rail

Named set Hull_part

Part 9 Named sets


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Modelling in GeniE

The boundary conditions along plate members are here assumed to be /fixed, fixed, fixed,fixed, fixed, fixed).

Ensure there are guide lines along all relevant edges.

Select the edges, RMB and click Create Support Curve

You may also insert support curves by using Insert | Support | support Curve.Remember to double click the end point

Select the Support Curves, RMB, Properties and change from fixed in all dofs to

(fix, fix, fix, fixed, fixed, fixed).

Apply the same boundary conditions to the opposite side.

Part 10 Boundary conditions


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Modelling in GeniE

Before making the loadcases make an analysis activity.

Right click in right browserpane area to access the

commands and select

New Analysis. Accept the

default options.

Create four loadcases called LC1, LC2_sea, LC_CR and LC_sea_CR. Create the loadcases from the browser pane area as shown

Part 11 Loads


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Modelling in GeniEPart 11 Loads

Include selfweight in LC1

Select Loadcases in the left pane and then select loadcase LC1 in the right pane,RMB and choose Properties. Make sure that Include structure self-weight in

structural analysis is ticked.

Create and include the sea wet surface load in LC_sea

Select the LC2_sea loadcase, RMB and click Set Current, then RMB again and select

Properties. Make sure that Include structure self-weight in structural analysis is

ticked OFF in this loadcase. Select plates in green as shown on next page (hull all around), RMB and select

Properties, then click the Wet Surface tab as shown below.

Use Create/Edit Wet Surface to create the wet surface name WS_sea. After that,

back in the properties menu, select the wet surface name WS_sea and RMB to Apply

Wet Surface to selection.

Create and include the cargo rail wet surface load in LC_CR Repeat the process above described for the red surfaces (both sides of cargo rail)

creating the wet surface WS_CR.


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Select Properties | Wet Surfaces in the left pane and RMB to Color code all visibleproperties. The display should look like below.

Create loads on the wet surfaces

Use Insert | Explicit Load | Surface Load to define two surface loads as shown below.

Surface load SLoad1 should belong to loadcase LC2_sea and SLoad2 to LC_CR.

Hint: Move the cursor over the Intensities and Footprint lines to open

hidden parts of the menus.

Surface load sea called SLoad1:

Part 11 Loads


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Surface load CR called SLoad2:

Define loadcase LC_sea_CR as a combination of LC2_sea and LC_CR. Use a load factorof 1.0 for both loadcases.

Part 11 Loads


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Modelling in GeniEPart 12 Run analysis

Run the analysis from Tools | Analysis | Activity Monitor (or by using the shortcutALT+D)

There are several ways of verifying

analysis details. The example below

shows how to open the listing file from

the analysis done by Sestra.


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Modelling in GeniE

You may now look at the finite element mesh and results by selecting e.g. the view settingResults with mesh

It is not the objective of this tutorial to do results presentation, but the results menu is

accessed via Tools | Analysis | Presentation or from using short-cut ALT+P (in this

case the displacements are shown for the whole structure using load combination

LC_sea_CR).

Note the large displacements displayed. This is due to default scaling of the deformedshape plot. In Results Presentation menu click the deformed shape settings option and

change the deform factor to 1.0 for Scale Displacements. Notice the change in the

deformed shape plot

Part 13 Results presentation


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Modelling in GeniE

Select the Hull_part set in the right pane and press ALT+S to show this set only. In order tobetter view the interior of the model, select parts of the model and press ALT + Minus hide

the selected parts. Example below shows LC_sea_CR, G-stress, sigxx and top for a subset

of the Hull_part set.

Open the results database (R1.SIN) in Xtract to get access to general FE results processing

You find the file where you have stored your GeniE model and results

You have access to the sets in Xtract as well.

Part 13 Results presentation

A5 GeniE Cargo Rail

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Transcript of A5 GeniE Cargo Rail