HD64346: ASD : CLASH : RESULT OF CLASH DEPENDS ON METHOD OF CREATION OF GEOMETRY.

APAR status

• Closed as user error.

Error description

• ASD : CLASH : RESULT OF CLASH DEPENDS ON
  METHOD OF CREATION OF GEOMETRY.
  .
  Scenario.
  .
  1. Start CATIA V5R16SP4
  2. Tools / Options / Display / Performance TAB 3D
  Accuracy (x) Fixed 0.01
  This is the point of the scenario.
  3. File > Open and select provided
  PRODUCTx.CATProduct  here, x is 1, 2, or 3.
  4. Select Analyze > Clash from main menu.
  5. In "Check Clash" dialogue, click "Apply" button
  without changing values.
  .
  < about the provided 3 CATProduct >
  All of the shape are same.
  1. The inside Part body, a cylinder The diameter is
  50mm.
  2. The outside Part body, a cube of 100mm x
  100mm with a hole, The hole's diameter is
  50.05mm.
  These center points are coincidence.
  The creation scenario of 2.(the outside body) are
  difference on 3
  CATProduct.
  The results of Analyze/Clash aren't same.
  PRODUCT1.CATProduct  KO
  PRODUCT2.CATProduct  OK
  PRODUCT3.CATProduct  OK
  .
  Expected Result
  .
  The analysis results of same geometries should be
  same, although the creation scenarios are different.
  .
  

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

• null
  ==========*===========*==========
  Incident Diagnosis.
  .
  Clash / Contact computation is based on following
  rules :
  The computation is based on tesselation and not on
  geometry
  The minimum distance between objects decides
  whether we have a clash, contact or clearance.
  If the minimum distance < sag1 + sag2, we have a
  contact
  If user checks for Product1 then it can be seen that
  the Minimum distance is 0.003 mm which is less
  than summation of SAG value which is 0.02
  (0.01+0.01) here
  Hence we see a contact.
  .
  In case of Product 2 or Product 3 the minimum
  distance is 0.025 which is greater than summation
  of SAG values (0.02). This leads to no detection of
  contact which is correct.
  .
  Correct Application.
  .
  With the mimimum distance analysis for Product1 it
  is seen that the value is less than SAG summation.
  It implies that the axis of Hole and axis of Cylinder
  are NOT coincident.
  .
  In Product1 make a coincidence constraint between
  axis of Hole and axis of Cylinder and now check for
  Contact / Clash detection , user will notice that
  there exists no contact.
  .
  Documentation Reference.
  .
  DMU Space Analysis
  Glossary
  Interference analysis.
  .
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels