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Insert the following sample cgr files: ATOMIZER.cgr,
BODY1.cgr, BODY2.cgr, LOCK.cgr, NOZZLE1.cgr, NOZZLE2.cgr,
REGULATION_COMMAND.cgr, REGULATOR.cgr, TRIGGER.cgr and VALVE.cgr.
They are to be found in the online documentation file tree in the common
functionalities sample folder cfysm/samples . |
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Select Insert > Clash from the menu bar or
click the Clash icon
in the DMU Space Analysis toolbar to
run a check of type Contact + Clash inside one selection comprising
Valve and Body1.The Check Clash dialog box expands to show the
results of the initial computation. The first interference is
selected by default and a detailed computation has been run.
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Note: The results given in the various
tabs in the dialog box correspond to the worst case. |
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Close the
Preview window.
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Click
Results window
in the Check Clash dialog box to view the selected
interference in a dedicated viewer.
The Interference Results window opens. By default,
the detailed computation mode is set to Element level. Triangles
identifying contacts and clearances, intersection curves identifying
clashes and the penetration depth or minimum distance are computed
and displayed.
Object viewing commands and commands in the Window
menu are available in this window. You can, for example, tile the
Interference results window and the original document window
vertically or horizontally. |
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Select Window > Tile Vertically from the menu
bar to organize the open windows vertically.
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Click More in the Check Clash
dialog box to access visualization filters.
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Available in P2 configuration |
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(optional) Specify a new clash font size if
necessary (Tools
> Options > DMU Space Analysis > DMU Clash)
For example, if you specify 10 for the
clash value font size, the new value size specified is
automatically taken into account. |
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This is what you obtain: |
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Clash values display is
not impacted by the zoom command nor participate to the
Fit in All
functionality |
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Select Show / Noshow in the drop-down box:
Only the valve (product 1) is visible. The body
(product 2) is hidden.
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Select Noshow / Noshow in the drop-down box: Geometries
of both products are hidden. The graphics representations of
interferences only are displayed.
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Click OK in the Check Clash dialog box to exit
when done. Interference results are kept as specification tree features.
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P2 Capabilities
Computing and Displaying Clash
Results as an Intersection Volume
In DMU-P2, you can compute and display clash results as a
voxel volume or a boolean solid. To do so:
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Select Tools > Options..., Digital Mockup
> DMU Space Analysis, DMU Clash - Detailed Computation tab
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Select the type of volume of interest under Intersection
Volume
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If you selected Voxel, set the voxel size.
The voxel size is the edge-length of the voxel or cube. A lower value
will give you a more accurate result but will also require a longer
computation time and more memory.
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Click OK in the Options dialog box when done.
The intersection volume is also given in the Detailed Results box of the
Check Clash dialog box.
More about Intersection Volume
computation and Display
with Boolean option
The intersection volume computation is launched (during detailed
computation step) only if a clash is detected.
If a contact is
detected (the sag being taken into account), no computation is
performed for the intersection volume.
The two bodies involved in the computation can be
of two types: volumes or surfaces.
Let's consider three cases
Two volumes
- The result corresponds to the intersection between the
two considered volumes and can be one or more volume entities.
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Note: if one of the volume is not
watertight, the computation for the intersection volume may
not give correct results. |
Example 1 |
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Result: one single volume entity |
Example 2 |
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Result: a single volume entity |
Example 3 |
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Result: two volume entities. An inertial
box is created for each volume entity. |
One volume and a surface
The result is a surface or a set of surfaces
Example 1 (cross-sectional view) |
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Result: a surface with two components |
Example 2 (cross-sectional view) |
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Result: a surface |
Two surfaces
The intersection volume computation is not triggered.
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Notes:
- To obtain correct results the bodies involved in the
Boolean interference computation must be watertight.
The most common source of defects comes from surfaces
that are tessellated but not properly stitched. This results in
mismatched vertices, misaligned edges, overlapping geometry, and
non-manifold edges and vertices.
- The bodies involved must have consistent
oriented normals (on each triangles) otherwise the
boolean interference computation does not work.
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Voxel volume example::
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Boolean solid example:
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In the Results window, with Noshwo/Noshow
visualization filter set
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The inertia bounding box is displayed around
the intersection volume in the Results window (not in the
Preview window).
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Computing and Displaying Contact and
Clearance Results as Surfaces
In DMU-P2, you can compute and display contact and
clearance results as surfaces (rather than triangles). To do so:
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Select Tools > Options..., Digital Mockup
> DMU Space Analysis, DMU Clash - Detailed Computation tab
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Click Surface under Contact & Clearance Results
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Set the accuracy, then click OK in the Options
dialog box.
The accuracy entered defines the maximum value for the length of the
longest side of a triangular representation of the results. This
representation is used to obtain the yellow and green surfaces.
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In DMU-P2, the interference definition is also kept.
Using Visualization Filters
Visualization filters offer a more precise display in the
Interference Results window.
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All products: displays all products selected in the list.
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Product: displays products involved in the current
conflict.
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Element: displays elements involved in the current
conflict. Pairs of elements are listed in the Detailed Results box and
can be browsed using the Next and Previous options.
Note: The Element option is only available if the
detailed computation mode is set to Element level. This option is
particularly useful when in Design mode.
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Show / Show drop-down box: a variety of combinations lets
you better visualize the geometries of the two products involved in the
conflict.
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All cases drop-down box: lets you select the graphics
representation you want to see displayed (All cases, None or Worst
cases). If Element is selected, the Worst case option is not available.
Note: The effects of all
options, except the Show / Show drop-down box, can be seen in the Preview
window.
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Saving viewpoints
The different viewpoints set using the mouse ( zoom,
rotate, etc.) in the Interference Results window are also saved when you
exit the command. If you subsequently edit the results, the system
re-displays pairs of products from the last viewpoint set. Note, however,
that:
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