peterputer
Aerospace
- Sep 19, 2012
- 2
Hej,
if I add a point mass in my quasi 3D calculation (1° slice of a turbine stage) I get the following warning in Ansys mechanical:
The point mass is applied to a surface normal to the radial direction and is centered in the middle of that face, so my guess is that this leads to troubles since there are no cells since its a quasi 3D calculation and hence has just 1element (2nodes) in circumferential direction.
Anyone who could explain me if that warning is important or if i could neglacte it.
Regards
Peter
S O L U T I O N O P T I O N S
PROBLEM DIMENSIONALITY. . . . . . . . . . . . .3-D
DEGREES OF FREEDOM. . . . . . UX UY UZ ROTX ROTY ROTZ TEMP
ANALYSIS TYPE . . . . . . . . . . . . . . . . .STATIC (STEADY-STATE)
OFFSET TEMPERATURE FROM ABSOLUTE ZERO . . . . . 273.15
NONLINEAR GEOMETRIC EFFECTS . . . . . . . . . .ON
NEWTON-RAPHSON OPTION . . . . . . . . . . . . .PROGRAM CHOSEN
GLOBALLY ASSEMBLED MATRIX . . . . . . . . . . .UNSYMMETRIC
*** WARNING *** CP = 1.344 TIME= 20:22:24
Material number 3 (used by element 9396 ) should normally have at least
one MP or one TB type command associated with it. Output of energy by
material may not be available.
*** WARNING *** CP = 1.352 TIME= 20:22:24
Component CM_ROTVE, which has more than one non-zero CMOMEGA
components, contains MASS21 and/or MATRIX27 (mass) elements. The spin
softening stiffness matrices for these elements will be non-symmetric
if: (1) there are different masses in different directions for MASS21
or MATRXI27 (mass) elements, or (2) there are off-diagonal terms
coupling masses in different directions for the same node for MATRIX27
(mass) elements. Use the unsymmetric matrix option for the analysis
procedure to account for the non-symmetry.
*** WARNING *** CP = 1.352 TIME= 20:22:24
Component CM_ROTVE, which has more than one non-zero CMOMEGA
components, contains MASS21 and/or MATRIX27 (mass) elements. The spin
softening stiffness matrices for these elements will be non-symmetric
if: (1) there are different masses in different directions for MASS21
or MATRXI27 (mass) elements, or (2) there are off-diagonal terms
coupling masses in different directions for the same node for MATRIX27
(mass) elements. Use the unsymmetric matrix option for the analysis
procedure to account for the non-symmetry.
if I add a point mass in my quasi 3D calculation (1° slice of a turbine stage) I get the following warning in Ansys mechanical:
The point mass is applied to a surface normal to the radial direction and is centered in the middle of that face, so my guess is that this leads to troubles since there are no cells since its a quasi 3D calculation and hence has just 1element (2nodes) in circumferential direction.
Anyone who could explain me if that warning is important or if i could neglacte it.
Regards
Peter
S O L U T I O N O P T I O N S
PROBLEM DIMENSIONALITY. . . . . . . . . . . . .3-D
DEGREES OF FREEDOM. . . . . . UX UY UZ ROTX ROTY ROTZ TEMP
ANALYSIS TYPE . . . . . . . . . . . . . . . . .STATIC (STEADY-STATE)
OFFSET TEMPERATURE FROM ABSOLUTE ZERO . . . . . 273.15
NONLINEAR GEOMETRIC EFFECTS . . . . . . . . . .ON
NEWTON-RAPHSON OPTION . . . . . . . . . . . . .PROGRAM CHOSEN
GLOBALLY ASSEMBLED MATRIX . . . . . . . . . . .UNSYMMETRIC
*** WARNING *** CP = 1.344 TIME= 20:22:24
Material number 3 (used by element 9396 ) should normally have at least
one MP or one TB type command associated with it. Output of energy by
material may not be available.
*** WARNING *** CP = 1.352 TIME= 20:22:24
Component CM_ROTVE, which has more than one non-zero CMOMEGA
components, contains MASS21 and/or MATRIX27 (mass) elements. The spin
softening stiffness matrices for these elements will be non-symmetric
if: (1) there are different masses in different directions for MASS21
or MATRXI27 (mass) elements, or (2) there are off-diagonal terms
coupling masses in different directions for the same node for MATRIX27
(mass) elements. Use the unsymmetric matrix option for the analysis
procedure to account for the non-symmetry.
*** WARNING *** CP = 1.352 TIME= 20:22:24
Component CM_ROTVE, which has more than one non-zero CMOMEGA
components, contains MASS21 and/or MATRIX27 (mass) elements. The spin
softening stiffness matrices for these elements will be non-symmetric
if: (1) there are different masses in different directions for MASS21
or MATRXI27 (mass) elements, or (2) there are off-diagonal terms
coupling masses in different directions for the same node for MATRIX27
(mass) elements. Use the unsymmetric matrix option for the analysis
procedure to account for the non-symmetry.