A2 GeniE Semisub Pontoon
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Transcript of A2 GeniE Semisub Pontoon
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DET NORSKE VERITAS1
Semi pontoon
DNV Software GeniE Semi Pontoon Workshop
Revised 12 March 2011
Modelling in GeniE
DNV Software
SESAM User Course in Curved Structure Modelling
Genie Workshop:
Modelling pontoon and lower column
The purpose of this workshop is to create a model intended for both hydrostatic,hydrodynamic and stress analysis. The workshop does not document how to do the actual
analyses; the focus is on how to create the model.
The structure and loads are fictitious, but you will learn the necessary modelling tasks tomake a real structure
The following topics are covered:
Flat and curved plates
Regular and curved beams
Boundary conditions
Finite element mesh control
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 mayinteract with the model to derive necessary
information (such as length, positions, properties,
display settings and so on).
Detailed guidance is given in the
beginning of the tutorial
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 on
colour print out.
All pictures have been created using paper background
Default viewing settings have been modified
This tutorial has been revised with GeniE version D5.3-06 Your PC should have at least 1 GB RAM and
preferably hardware acceleration supporting OpenGL
Part 0 - General
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DNV Software GeniE Semi Pontoon Workshop
Revised 12 March 2011
Modelling in GeniE
DNV Software
Main dimensionsThe main dimensions are as shown below.
Notice that detailed dimensions are not
given; they are documented during the
workshop.
Emphasis has also been put on using different type of commands so that you learnalternative methods for the various tasks you want to do
As a consequence an operation documented herein may be more efficient by using
other commands
Part 0 - General
x
y
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DNV Software GeniE Semi Pontoon Workshop
Revised 12 March 2011
Modelling in GeniE
DNV Software
Part 0 General introduction to the workshop
Pages 1-4 Part 1 Design premise
Define the units, material and section types
Pages 5-10
Part 2 Outer hull, regular part one quadrantDefine the regular and parallel part of the pontoon
You will se the symbols to the right that represent start and stop of
beams during modelling.
Notice that the symbol for right mouse bottom click is
different from left mouse bottom click
Pages 11-13
Part 3 Outer hull, transition one quadrantModel the transition part between regular and fore part
Pages 14 - 21
Part 4 Make the fore partCreate the fore front of the pontoon
Pages 22 22
Part 5 Web framesInsert the web frames
Pages 23 27
Part 6 The columnDefine the column including one horizontal deck
Pages 28 35
Part 7 Pontoon stiffenersInsert longitudinal stiffeners
Pages 36 41
Part 8 Web frame stiffenersDefine the vertical stiffeners
Pages 42 45
Part 9 Longitudinal web frameInsert the longitudinal plate and stiffeners
Pages 46 46
Part 10 Make named setsDefine typical structural parts as sets for later use
Pages 47 49
Part 0 General
Click start of beam
1
Click end of beam
2
Use right mouse buttonto activate the contextsensitive menu
3
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Semi pontoon
DNV Software GeniE Semi Pontoon Workshop
Revised 12 March 2011
Modelling in GeniE
DNV Software
Part 11 Make a mesh
Learn how to control the meshPages 50-53
Part 12 Make pontoonCopy the 1/8 pontoon to a pontoon
Pages 54-54
Part 13 Boundary conditionsInsert boundary conditions. If you want to make a more complete structure as shown in
remaining parts you dont insert boundary conditions at this stage
Pages 55 - 55
Part 14 Make pontoonCopy the pontoon to a 1/2 pontoonPages 56 - 56
Part 15 Make the complete structureMake the complete structure by copying the pontoon and inserting horizontal bracings in
between.
Pages 57 57
Part 0 General
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Semi pontoon
DNV Software GeniE Semi Pontoon Workshop
Revised 12 March 2011
Modelling in GeniE
DNV Software
Define units meters and N Start the program and open a new workspace File|New Workspace. Specify name
Semi_pontoon 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 to
change now.
Define materials Use the command Edit|Properties and select Material. Select Create/Edit Material to
give the details for MAT1 (remember to tick Allow edit). Set the material type to
default and click OK when done
Part 1 Design premise
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DNV Software GeniE Semi Pontoon Workshop
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Modelling in GeniE
DNV Software
Define section properties
Section profiles Tbar425x120x12x25, Tbar575x150x12x25 and Tbar885x200x14x35are found from section libraries
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 tbar (a library
containing typical Tbar ship profiles)
Part 1 Design premise
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DNV Software
You now find the profiles Tbar425x120x12x25, Tbar575x150x12x25 and
Tbar885x200x14x35 The sections are now selected by clicking on Tbar425x120x12x25 and then
LMB+click on Tbar575x150x12x25 and Tbar885x200x14x35
The picture below shows the selection of Tbar425x120x12x25 andTbar575x150x12x25
Click OK and the profiles are
now part of the design premise
Click create/edit section
to modify the imported sectionsor to insert the remaining brace
section
Part 1 Design premise
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DNV Software
Define the profiles Brace. You may use mixed units as shown
Define the plate thicknesses Pl12, Pl15 and Pl30 as follows: Use the command Edit|Properties
and select Thickness.
Select Create/Edit Thickness to
start defining the thickness
properties
Part 1 Design premise
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DNV Software
The thickness and section properties may now be accessed from the browser. Since the
modelling will start with the outer hull, the plate thickness Pl15 should be set as default.Similarly, the first use of stiffeners will be at a outer hull; you should set
Tbar885x200x14x35 to defaults. Notice also the default symbol that will appear.
Material default has already been set when creating the property
Part 1 Design premise
Use right mouse buttonto activate the context
sensitive menu
1
Use right mouse buttonto activate the contextsensitive menu
1
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Specify the mesh settings for automatic mesh creation as follows:
Edit|Rules|Meshing. In addition to default settings tick off for Use second order elements
Round off Mesh Density
Part 1 Design premise
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Insert a guiding plane from the command
Insert|Guiding Geometry|Guide Plane Dialogand enter the values as shown.
Give x-value 0 m, number of spacings 8 in each direction (equal length of allspacings) notice that input may be given in several ways
This plane is used asreference when makingthe outer hull andweb frames
Using the view settings Default
display you see the guide
plane
Part 2 Outer hull, regular part
one quadrant
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Insert a polycurve as follows (one half of the pontoon will be modelled initially)
Insert|Guiding Geometry|Poly Curveand define the positions as shown below
Notice you need to click in between
curvature to guide the tangential
This curve will be used to extrude the
hull form
Start polycurve
1
2nd point
23
4
5
6
7
8 9 10
Double click toend polycurve
Part 2 Outer hull, regular part
one quadrant
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DNV Software
Make the outer hull by a extrude operation.
Select the polycurve and select the commandInsert|Plate|Sweep Curve Dialog
The name of the curve is already
defined (since it was selected)
Specify the length and direction
of the extrusion
-40m in x-direction
The outer hull for one half of the
column width is now created
Part 2 Outer hull, regular part
one quadrant
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Revised 12 March 2011
Modelling in GeniE
DNV Software
Copy the guide plane to new positions for reference when creating the transition zone
between curved corners and quadratic hull shape. Select the guide plane, right click and select Copy|Translate
The vector is found by clicking between start and stop positions of the copyvector
Part 3 Outer hull, transition
one quadrant
Click endof copy vector
2
Click startof copy vector
1
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DNV Software GeniE Semi Pontoon Workshop
Revised 12 March 2011
Modelling in GeniE
DNV Software
Copy the new guide plane 2.5 meters in negative x-direction.
Select the guide curve, right click and select Copy|Translate and type in vector -2.5m0m 0m
Change the surface normal of the plate
by selecting the plate, right click and
choose Flip Normal
Part 3 Outer hull, transition
one quadrant
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DNV Software GeniE Semi Pontoon Workshop
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Modelling in GeniE
DNV Software
Make a model curve and guide lines to refer to when creating the transition part between
curved corner hull and quadratic corner hull. Use command Insert Guiding Geometry|Model Curve and click point 1 and 2
First zoom in on model as shown
Click endof model curve
2
Click startof model curve
1
Part 3 Outer hull, transition
one quadrant
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DNV Software
Insert two guidelines to use when creating the curved transition. Use command Insert
Guiding Geometry|Guide Line Dialog
Repeat the operation by inserting a new guide
line (Curve4) as shown
Make the transition zone by selecting all three curves (the model curve and the twoguidelines), click right mouse button and select Cover Curves
Start line
1
End line
2
Part 3 Outer hull, transition
one quadrant
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DNV Software
Copy the curved shell to the bottom part using a mirror copy. Select the plate, right
click and choose Copy|Mirror. The mirror position is found by clicking on point 1 while the direction is
found from clicking the vector from point 2 to point 3.
Mirror point
1
Start vector
2
Start vector
3
Part 3 Outer hull, transition
one quadrant
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Revised 12 March 2011
Modelling in GeniE
DNV Software
Make the remaining part of the transition zone by inserting regular flat plates. Use
command Insert|Plate|Flat Plate Dialog Click on the four points as shown below
Use same technique to insert
the remaining plates as shown
1st corner
1
2nd corner
2
3nd corner
3
4th corner
4
Part 3 Outer hull, transition
one quadrant
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DNV Software GeniE Semi Pontoon Workshop
Revised 12 March 2011
Modelling in GeniE
DNV Software
Make the fore part by using a skin curve technique
Copy the guideplane using Copy|Rotate as shown (select the guide plane and rightclick to access the command)
rotation point 1
vector between point 2 and point 3
specify angle 90 degrees
Insert a guide arc by command Insert|Guiding Geometry|Elliptic Arc
by clicking at the three points as shown
Part 4 Outer hull, fore part
one quadrant
Rotation point
1
Start vector
2
End vector
3
Rotation point
1
Start arc
2
End arc
3
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Modelling in GeniE
DNV Software
Insert two more guidelines as shown and copy all three down to the bottom part of
the pontoon:
Select the three upper curves, right click and choose Cover Curves
Repeat the same process for the lower three curves
Select the plate, right click and choose Flip Normal
Part 4 Outer hull, fore part
one quadrant
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DNV Software
Finally make the vertical hull part by skinning between the lower and upper arc
guide. Use command Insert|Plate||Skin Curves First click the bottom curve, then double click the upper curve
Select the new curved plate, right click
and flip the normal
Part 4 Outer hull, fore part
one quadrant
Seen from outside
Seen from inside
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Modelling in GeniE
DNV Software
Two different types of web frames will be made, one watertight and one open. The
watertight will be made using a top down modelling approach while the open will be madeusing a bottom-up approach.
Change default thicknessproperty to Pl12.
Insert a flat plate asshown (at x=0)
Select the plate, right click and choose
Divide
Select the superfluous parts and delete them
to trim the plate to the outer hull.
Part 5 Web frames
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DNV Software
Copy the guideplane to the next frame position at x=-5m.
Define the guide lines as shown on the new guide plane and insert plates for each
part (either from insert plate or cover curve operation)
Part 5 Web frames
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DNV Software
Select the corner plates (Pl14 and Pl18), right click and select divide. Then delete the
superfluous parts to trim to hull shape.
Finally, select all plates in the plane, right
click and choose Join. The 6 plates is now
joined to one plate
Part 5 Web frames
Two different web-frames in place
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Copy the web frames as follows.
Select the watertight and copy to x-values -10m, -22.5m -30m, -37.5m, -40m
The plate at x=-47.5 m has been made from inserting a regular flat plate, selecting it, rightclick, choose divide and delete the parts that are outside the hull to trim it.
Part 5 Web frames
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Modelling in GeniE
DNV Software
Select the non-watertight and copy to x-values as shown:
You may verify the plate thicknesses by
To go back to normal modelling view, click the paintbrush
Part 5 Web frames
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Modelling in GeniE
DNV Software
One quarter of the column will be modelled. The other parts will be a copy of the first
quarter. Start by making guidelines for references when making the plates.
Use command Insert|Guiding Geometry|Guide Line Dialog
Click first in End 1 input field and then on the model as indicated to find thecoordinates
Do the same for End2 and subtract 7.5 meters in y-direction
Select the new guideline and
copy|rotate as follows
Part 6 The column
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DNV Software
Select the guidelines and
copy upwards 1 meterand 4 meters
Copy the upper guidelines
2.5 meters in x and y direction
so that:
Select the outer upper curves,
right click, select divide
and then delete the highlighted lines:
Part 6 The column
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DNV Software
Insert a circle curve as follows using
command Insert|Guiding Geometry|Guide Arc Elliptic.
Select the curve, right click and
choose Divide. Use parameter
0.5, i.e. divide in 2 equal parts.
Insert guidelines as
follows:
Insert the vertical guidelines
at the edges as shown:
Part 6 The column
Rotation point
1
Start arc
2
End arc
3
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Change default plate thickness to Pl30
Insert the vertical plates asshown using either
Insert|Plate|Skin Curves
or
Insert|Plate|Flat Plate
Select the curves as shown,
right click and choose
Cover Curves
Repeat the process for the right curved part
Finally, insert plates for the remaining
vertical parts using Insert|Plate|Flat Plate
Part 6 The column
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Create the upper part of the column by an extrude command 10 meters in vertical z-
direction. Select the curves as shown, and from command Insert|Plate|Sweep CurveDialog
You need to flip the normal on some of the plates to orient them with theplate normal outwards
Part 6 The column
Seen from inside
Seen from outside
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Insert a deck level at elevation +22m
Copy the guidelines as shownupwards 12 meters
Insert new guidelines to form a quadrant
Change plate thickness to Pl12
Insert a plate at elevation +22m, select it,
choose divide and then delete the partsoutside the column such that it is trimmedto the column surface
Part 6 The column
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Define an opening in the deck level +22m
Start by selecting guidelineas shown and divide with length5.5 meters the inner part becomes2 meters
Copy this line and insert a new
in between so that a quadrantis formed
Use command Insert|GuidingGeometry|Fillet Curves andclick on the highlighted lines andspecify radius 1.0
Part 6 The column
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Finally, select the plate, right click, choose divide and click on the curve (itbecomes orange in colour) to divide the plate.
Select the inner part and delete it
Select all parts above pontoon level and copy|mirror such that
Part 6 The column
Seen from insideSeen from outside
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Stiffeners will be inserted at bottom, side and top of the pontoon
Make sure you have section profile Tbar885x200x14x35 as default
Insert one beam as follows using command Insert|Beam|Straight Beam
Flush the beam to inside of the bottom pontoon plate:Select the beam, right click, choose Edit Beam and
select Offset Vector. Click Flush to bottom
Part 7 Pontoon stiffeners
Start beam
1End beam
2
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To check that the beam is connected to the plate, you may doubleclick the plate beneath
the beam.
The display will now show the
topology of the model this
means that the connection
line between the plate and
the beam is shown. In the
picture below the connection
line is selected for
better visibility
Doubleclick the plate again, to get back to normal modelling view.
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Copy the stiffener to locations as shown:
(the fore part of the pontoon depicted)
Select all the three beams, right click andchoose divide. Delete the stiffener parts
outside the for part of the pontoon hull
Change the section default to Tbar575x150x12x25 and insert stiffeners at the top deckusing the same approach as above. Notice that you need to rotate the first stiffener as shown
before you do flushing to bottom (select beam, right click, Edit Beam and Local system)
Part 7 Pontoon stiffeners
The stiffeners are now trimmed to the hull surface
The stiffener is rotated
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Stiffeners are now in place
for bottom and top part ofpontoon
(plates are removed for
visibility)
Change default section to Tbar425x120x12x25 and insert one beam as follows:
Rotate and flush the beam so that (rotate 90degrees around local x-axis and flush to bottom)
(plates are removed for visibility)
Part 7 Pontoon stiffeners
Start beam
1End beam
2
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Copy the stiffener to positions
Insert horizontal stiffeners in the fore part (only the fore part is shown in the following)
Copy the selected guideline downwards to new position
Select the new guideline, right click and
select Create Beam
Select the beam, right click and rotate 90degrees around local x-axis
Part 7 Pontoon stiffeners
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Flush the stiffener to the plate
Select the stiffener, right click, Edit Beam, Offset vector and choose Flush Bottom
Copy the stiffener to positions
The structure now looks
(some plates removed for visibility)
Part 7 Pontoon stiffeners
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Insert stiffeners as shown on the watertight web frames.
Start with one beam, orientate correctly (+90 degrees around local x-axis) and flushto the side of the plate. Use profile Tbar425x120x12x25
Insert eccentricities at both end of beams so that it flushes with bottom and top
longitudinal stiffeners. The eccentricities equal (web height + flange thickness) of
long. stiffener.
Part 8 Web frame stiffeners
Eccentricity from flush to plate
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Insert a vertical eccentricity at the top part as shown (vertical down -0.6m and 0.6)
Remember the eccentricity from plate flush)
Copy the vertical stiffener to positions as depicted (first to web frame, select all three
and copy to all watertight web frames):
Part 8 Web frame stiffeners
Some watertight web frames removed for visibility
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Finally copy the vertical stiffeners to last watertight web frame using a copy mirror
operation:
The watertight web frames have now vertical stiffeners:
Part 8 Web frame stiffeners
Notice that local axis
is flipped when mirroring hence no need for manual rotation
Copy to this position also
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Copy one of the vertical stiffeners at the web frame to fore outer hull as shown:
Part 8 Web frame stiffeners
Copy the stiffener
(plates removed for visbility)
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Set default thickness to Pl15.
Insert a flat plate covering the length of the pontoon (Insert|Plate|Flat Plate):
Insert longitudinal stiffeners accordingly Use profile Tbar425x120x12x25
Rotate around local x-axis 90 degrees and flush on this side of plate (flush bottom)
Part 9 Longitudinal web frame
1st point
1
2nd point
2
3rd point
3
4th point
4
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Named sets are created from selecting objects, right click and choose Named Sets
Select all structure from view setting Modelling-Structure Rubberband select as follows
Right click and choose Named Sets
Give the name One_eight_pontoon
Select the longitudinal web frameincluding the stiffeners and give it
set name Longitudinal_web_frame
The named sets are now availablefrom the browser
Click a set to access commands
for visibility
Part 10 Make named sets
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Continue to make sets:
Set name: Stiffeners Hint: Open browser Property -> Sections, then select all properties, right click and
choose Select Objects
Set name: Half_column
Set name: Web_frames
Includes stiffenersand plates
Part 10 Make named sets
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Set name: Outer_hull
Includes stiffeners and plates
You may create additional set names modelling and results viewing become moreefficient when referring to named sets.
Part 10 Make named sets
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Use default mesh density 2.5 meters
(i.e. 2 elements between each stiffener)
From browser, right click in mesh panewindow select New Mesh Property
Define a new mesh property Md_defand specify 2.5 meters as max mesh size
Right click the Md_def and chooseSet Default
Part 11 Make a proper mesh of
the 1/8 pontoon
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Create a finite element mesh from Tools|Analysis|Create Mesh (or use short command
ALT+M) Change the display setting to Mesh All
to see the finite element mesh
The mesh is here seen with a shrink factor as
defined under View|Options|Annotation/Diagrams
Set the Shrunken Mesh Factor to 0.9
In the following is described how to ensure a proper finite element distribution from thebottom of the column and upwards:
From browser Set, choose Half_column and short command ALT+S (Show
selection only) to focus this part only
This part needs mesh control
Part 11 Make a proper mesh of
the 1/8 pontoon
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Part 11 Make a proper mesh of
the 1/8 pontoon
Change to view Modelling-structure and insert a feature edge as follows
Make sure the filter feature Edge is activated!
Insert from command Insert|Feature Edge
Select the Feature Edge, right click, select Properties and choose Mesh Property
Make a mesh property that ensures 6 equal elements along a line and apply to the
feature edge
Start edge
1
End edge
2
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Part 11 Make a proper mesh of
the 1/8 pontoon
Copy the feature edge (now including the mesh line setting) to the following
positions:
Make a new mesh (ALT+M), the mesh is now regularin the lower part as desired
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Part 12 Make pontoon
Select all structure, remove the set Longitudinal-web_frame and remember to include the
feature edges and mirror as follows (shown with preview): If you copy with the longituinal_web_frame you will see some warnings, but the
copy operation is succesful (GeniE will not copy over existing structure)
Select all new structure and give it aset name Quart_pontoon
Make a new mesh (ALT+M)
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Part 13 Boundary conditions
Select the guide line as shown, right click and choose Create Support Curve
Depending on what type of analysis you want to perform you decide the boundaryconditions by right clicking the support curve and change the conditions from
Properties (typically fixed, free, supernodes)
Select the support curve an mirror to the other half of the pontoon.
Boundary conditions in place
Shown here: Fixed, Fixed, Fixed, Free, Free, Free
(plates removed for visbility)
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Part 14 Make pontoon
Select all structure remember to include the feature edges and copy using copy mirror as
shown You should not include
the boundary conditions
in the copy operation
Make a new mesh (ALT+M)
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