HD61367: PD : MEASURE INERTIA : THE VALUES OF IOXG AND IOYG MEASURED BY MEASURE INERTIA 2D ARE EXACTLY OPPOSITE TO THAT MEASURED IN MEA

APAR status

• Closed as documentation error.

Error description

• PD : MEASURE INERTIA : THE VALUES OF IoxG
  AND IoyG MEASURED BY MEASURE INERTIA 2D
  ARE EXACTLY OPPOSITE TO THAT MEASURED IN
  MEASURE INERTIA 3D
  .
  SCENARIO:
  SCENARIO:
  1.Open the Sent CATPart
  2.Select Measure Inertia icon
  3.Choose Measure Inertia 2D
  4.Surface is chosen
  Check IoxG and IoyG Values
  5.Choose Measure Inertia 3D
  6.Choose Surface again
  Check IoxG and IoyG Values
  ==== They are interchanged. This is the problem
  .
  

Local fix

Problem summary

• PD : MEASURE INERTIA : THE VALUES OF IoxG AND IoyG MEASURED BY
  MEASURE INERTIA 2D ARE EXACTLY OPPOSITE TO THAT MEASURED IN MEA
  S
  PD : MEASURE INERTIA : THE VALUES OF IoxG
  AND IoyG MEASURED BY MEASURE INERTIA 2D
  ARE EXACTLY OPPOSITE TO THAT MEASURED IN
  MEASURE INERTIA 3D
  .
  SCENARIO:
  SCENARIO:
  1.Open the Sent CATPart
  2.Select Measure Inertia icon
  3.Choose Measure Inertia 2D
  4.Surface is chosen
  Check IoxG and IoyG Values
  5.Choose Measure Inertia 3D
  6.Choose Surface again
  Check IoxG and IoyG Values
  ==== They are interchanged. This is the problem
  .
  

Problem conclusion

• THIS MODIFICATION WILL BE INCLUDED IN CATIA
  DOCUMENTATION DELIVERED WITH CATIA
  VERSION 5 RELEASE 18
  .
  Documentation Reference
  DMU Space Analysis user's Guide -
  Basic Tasks -
  Measuring 2D Inertia -
  .
  MODIFICATION:
  The DMU Space Analysis documentation has
  beenupdated accordingly
  The axes of inertia are highlighted and a bounding
  box parallel to the axes and bounding the selected
  item also appears.
  To obtain the same type of inertia matrix for
  similar shapes independent from the space
  orientation of the surface being measured (i.e.
  invariant); the x-axis is set along the Principal
  Moment axis with the smallest value (M1), i.e.
  along the longest side (red) and the y-axis is set
  along the second Principal Moment axis (M2)
  (green)
  Principal Axis matrix (A) expresses the axes
  orientations in the Global Axis System
  .
  

Temporary fix

Comments

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