![](../icons_C2/common/areference.gif) |
Accelerations are
intensive loads representing
mass body force (acceleration) fields of uniform magnitude applied to
parts.
Acceleration objects belong to Loads objects sets.
You need to specify three
components for the direction of the field, along with a magnitude information. Upon modification of any of these four
values, the mass body force vector components and magnitude are updated
based on the last data entry.
Units are mass body force (or acceleration) units (typically
N/kg, or m/s2in SI).
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Accelerations can be applied to the following types of
Supports:
![](../icons_C2/common/iconblck.gif)
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This task shows you how to
create an Acceleration applied to a part.
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You can use the sample00.CATAnalysis
document from the samples directory
for this task:
Finite Element Model containing a Static Analysis Case and computed corresponding Static
Solution.
Before You Begin:
Go to View -> Render Style -> Customize View and make
sure the Shading, Outlines and Materials options are active in the Custom View Modes
dialog box.
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1. Click the Acceleration icon
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The Acceleration dialog box is displayed.
2. You can change the identifier of the Acceleration by editing the Name field.
3. Set the Axis System.
![](images/aaPanelLoadForceAcceleration.gif)
The Axis System Type combo box allows you to
choose between Global and User Axis systems for entering
components of the acceleration field.
![](_themes/v5r5/ul1.gif) | Global: if you select the Global Axis system, the components of the
acceleration field will be interpreted as relative to the fixed
global rectangular coordinate system. |
![](_themes/v5r5/ul1.gif) | User: if you select a User Axis system, the
components of the acceleration field will be interpreted as
relative to the specified rectangular coordinate system. |
To select a User Axis system, you must activate an existing
Axis by clicking it in the specification tree. Its name will then be
automatically displayed in the Current Axis field.
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![ainfo.gif (980 bytes)](../icons_C2/common/ainfo.gif) |
You can define the mass body force direction by using the compass.
You can modify the compass
orientation either with the mouse or by editing the compass.
By applying the compass to any
part geometry, you can align the compass directions with the implicit axis
directions of that geometry: drag the compass by handling the red square
and drop it on the appropriate surface. The normal direction to this
surface defines the new direction. Then, click on the Compass Direction
button to take this new direction into account. You can now invert the
direction if desired, editing the values of the three components.
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![](../icons_C2/common/iconblck.gif) |
4. Enter values for the X, Y, Z
components of the mass body force field: the corresponding Norm
value is automatically computed and displayed.
5. Select the geometry
support (a part) on which the mass body force is to be applied. Any selectable geometry is
highlighted when you pass the cursor over it.
You can select several supports in
sequence, to apply the Acceleration to all supports
simultaneously.
Symbols representing the Acceleration are displayed on the
support geometry to visualize the volume body force field.
![](images/aaImageLoadForceAcceleration.gif)
The remaining three
fields are automatically computed and displayed.
The visualized symbols orientation is also updated to reflect the
modification.
6. Click OK in the Acceleration dialog box to
create the Acceleration.
An Acceleration object appears in the specification tree under the active Loads
objects set.
![](images/6treeloadaccel.gif)
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![ainfo.gif (980 bytes)](../icons_C2/common/amethod.gif)
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![](_themes/v5r5/ul1.gif) | You can either select the
part and then set the Acceleration specifications, or set the Acceleration
specifications and then select the part. |
![](_themes/v5r5/ul1.gif) | If you select other
parts,
you can create as many Acceleration loads as desired with the
same dialog box. A series of Accelerations can therefore be
created quickly. |
![](_themes/v5r5/ul1.gif) | Loads are required for Stress
Analysis computations. |
![](_themes/v5r5/ul1.gif) | If several Analysis Cases have been defined in
the Finite Element Model, you must activate a Loads objects set in the
specification tree before creating an Acceleration object (only
available if you installed the ELFINI Structural Analysis
product). |
![](_themes/v5r5/ul1.gif) | Acceleration objects can be edited by a double click on the
corresponding object or icon in the specification tree. |
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![ainfo.gif (980 bytes)](../icons_C2/common/awarning.gif) |
Make sure the computation is finished before
starting any of the below operations.
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![ainfo.gif (980 bytes)](../icons_C2/common/tips.gif)
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Products
Available in
Analysis Workbench
The ELFINI Structural Analysis
product offers the following additional features with a right mouse click
(key 3):
![](_themes/v5r5/ul1.gif) |
on an Acceleration object:
Translational acceleration visualization on mesh: the translation of your Acceleration
object specifications into solver specifications can be visualized
symbolically at the impacted mesh elements, provided the mesh has been
previously generated via a Compute action.
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![](_themes/v5r5/ul1.gif) |
on a Loads objects set:
1) Generate Image: generates an image of the computed Load objects
(along with translating all user-defined Loads specs into explicit solver commands
on mesh entities), by
generating symbols for the elementary loads imposed by the Loads
objects set. The image can be edited to include part or all of the
options available.
2) Report: the partial status and results of intermediate
pre-processor computations are reported in HTML format. It represents
a subset of the global Report capability and generates a partial
report of the Loads objects set Computation.
See Creating Pressures for more details.
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3) Double-clicking on the Loads set, you will display the
Loads dialog box that lets you choose whether you wish to apply
self-balancing to the load. Example of use: if this option is used with
iso-static specifications, it will allow you to simulate free-body
loading. If you make the option active, the center of inertia results
null.
![](images/aaPanelSelfBalancing.gif)
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