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I am using Creo Parametric Release 7.0 and Datecode7.0.9.0
When I use Analysis / Mass properties / preview
The coordinate system displayed at center of gravity with respect to principal moment of inertia axis (1, 2, 3) seems not correct. For example, if I extrude a cylinder whose axis is not colinear to origin cordinate frame, the principal moment of inertia displayed is not colinear to the cylinder (when it should be)
Solved! Go to Solution.
Hi,
in Creo 7.0.5.0 I can see this "picture".
1.] maybe your Creo 7.0.2.0 contains a bug (try installing 7.0.5.0 to verify it)
2.] maybe your config.pro contains some specific option causing the problem (please upload config.pro)
I'm using Creo 9.
Built a cylinder, 1.50 diameter, extruded from Z=0.00 to Z=3.00, centered on X=-2.00, Y=0.00.
Mass Analysis preview shows:
VOLUME = 5.3014376e+00 INCH^3
SURFACE AREA = 1.7671459e+01 INCH^2
DENSITY = 9.9000000e-02 POUND / INCH^3
MASS = 5.2484232e-01 POUND
CENTER OF GRAVITY with respect to CS0 coordinate frame:
X Y Z -2.0000000e+00 0.0000000e+00 1.5000000e+00 INCH
INERTIA with respect to CS0 coordinate frame: (POUND * INCH^2)
INERTIA TENSOR:
Ixx Ixy Ixz 1.6483330e+00 0.0000000e+00 1.5745270e+00
Iyx Iyy Iyz 0.0000000e+00 3.7477021e+00 0.0000000e+00
Izx Izy Izz 1.5745270e+00 0.0000000e+00 2.2469812e+00
INERTIA at CENTER OF GRAVITY with respect to CS0 coordinate frame: (POUND * INCH^2)
INERTIA TENSOR:
Ixx Ixy Ixz 4.6743777e-01 0.0000000e+00 0.0000000e+00
Iyx Iyy Iyz 0.0000000e+00 4.6743762e-01 0.0000000e+00
Izx Izy Izz 0.0000000e+00 0.0000000e+00 1.4761190e-01
PRINCIPAL MOMENTS OF INERTIA: (POUND * INCH^2)
I1 I2 I3 1.4761190e-01 4.6743744e-01 4.6743795e-01
ROTATION MATRIX from CS0 orientation to PRINCIPAL AXES:
0.00000 1.00000 0.00000
0.00000 0.00000 1.00000
1.00000 0.00000 0.00000
ROTATION ANGLES from CS0 orientation to PRINCIPAL AXES (degrees):
angles about x y z -90.000 0.000 -90.000
RADII OF GYRATION with respect to PRINCIPAL AXES:
R1 R2 R3 5.3033009e-01 9.4372905e-01 9.4372956e-01 INCH
1-2-3 temp coordinate system at center of gravity is exactly where I'd expect it.
Hi,
Thank's for your answer,
I made the same cylinder as you did. I have exactly the same mass analysis (different units 😉).
But the axis displayed seems to correspond to nothing, see attached picture. In my opinion, the axis I1 should be colinear to the axis of the cylinder (parallele to z axis).
What do I miss ?!
VOLUME = 5.3014376e+00 MM^3
SURFACE AREA = 1.7671459e+01 MM^2
DENSITY = 1.0000000e-06 KILOGRAM / MM^3
MASS = 5.3014376e-06 KILOGRAM
CENTER OF GRAVITY with respect to _PRT0001 coordinate frame:
X Y Z -2.0000000e+00 0.0000000e+00 1.5000000e+00 MM
INERTIA with respect to _PRT0001 coordinate frame: (KILOGRAM * MM^2)
INERTIA TENSOR:
Ixx Ixy Ixz 1.6649828e-05 0.0000000e+00 1.5904313e-05
Iyx Iyy Iyz 0.0000000e+00 3.7855577e-05 0.0000000e+00
Izx Izy Izz 1.5904313e-05 0.0000000e+00 2.2696780e-05
INERTIA at CENTER OF GRAVITY with respect to _PRT0001 coordinate frame: (KILOGRAM * MM^2)
INERTIA TENSOR:
Ixx Ixy Ixz 4.7215937e-06 0.0000000e+00 0.0000000e+00
Iyx Iyy Iyz 0.0000000e+00 4.7215921e-06 0.0000000e+00
Izx Izy Izz 0.0000000e+00 0.0000000e+00 1.4910293e-06
PRINCIPAL MOMENTS OF INERTIA: (KILOGRAM * MM^2)
I1 I2 I3 1.4910293e-06 4.7215903e-06 4.7215954e-06
ROTATION MATRIX from _PRT0001 orientation to PRINCIPAL AXES:
0.00000 1.00000 0.00000
0.00000 0.00000 1.00000
1.00000 0.00000 0.00000
ROTATION ANGLES from _PRT0001 orientation to PRINCIPAL AXES (degrees):
angles about x y z -90.000 0.000 -90.000
RADII OF GYRATION with respect to PRINCIPAL AXES:
R1 R2 R3 5.3033009e-01 9.4372905e-01 9.4372956e-01 MM
Hi,
please pack your part into zip file and upload zip file.
Hi,
in Creo 7.0.5.0 I can see this "picture".
1.] maybe your Creo 7.0.2.0 contains a bug (try installing 7.0.5.0 to verify it)
2.] maybe your config.pro contains some specific option causing the problem (please upload config.pro)
Hi @BB_10451093,
I tested the part in Creo 7.0.2.0 and 7.0.9.0, already tested by Martin in Creo 7.0.5.0, seems it was a bug in Creo 7.0.2.0 as it is reproducible for me in Creo 7.0.2.0 but not in other datecodes.
Check the image from two of the datecodes
I hope this will help.
Thanks.
Hi all,
it seems that the bug continues in Creo 10.0.1.0 - . I see the roatation on the COG CS for the assigned parameter calculation.
Can someone confirm? Thanks