Designer做扭振分析，装配完成后进行模态分析时报误

帕尼尼煤老板

Designer中装配完后进行模态分析报错说Natural frequence cannot be determined! assembling not performed yet!  各位大神有没有知道大概是什么原因导致的？


下面是装配时对话框里出现的日志内容：
=== Checking License...
...License OK.

Info: No reparsing necessary for the CFF file:
   F:\WORK\AVLanalysisfile\niuzhen\shm\Crankshaft\\CrankshaftNZ.CFF
INFO Vibrodamper:
   Hub Length: 0.000000
   Axial position of C.G. of ring relative to C.G. of hub: 0
=== Arranging throw no. 1
...Done.

=== Arranging throw no. 2
...Done.

=== Arranging throw no. 3
...Done.

=== Arranging throw no. 4
...Done.

=== Assembling units ...
Old labeling pattern [AUUNN]
- Assembling mass matrix...
- Assembling stiffness matrix...
Warning: There are elastic elements in the model having non-positive diagonal terms in stiffness matrix!

         (see warning_stiff.RPT for details)
...Done.



Warning:
The following points have nearly zero
or negative values of mass and/or
of diagonal terms in tensor of inertia
--------------------------------------

   1:  10001
   7.700E-01
  1.35E-03  0.00E+00  0.00E+00
  0.00E+00  0.00E+00  0.00E+00
  0.00E+00  0.00E+00  0.00E+00

   2:  10002
   1.580E+00
  5.58E-06  0.00E+00  0.00E+00
  0.00E+00  0.00E+00  0.00E+00
  0.00E+00  0.00E+00  0.00E+00
--------------------------------------


Warning:
The following elements have non-positive
diagonal terms in stiffness matrix:
--------------------------------------

   1 :   10001  10002
  0.00E+00  0.00E+00  0.00E+00  0.00E+00  0.00E+00  0.00E+00
  0.00E+00  0.00E+00  0.00E+00  0.00E+00  0.00E+00  0.00E+00
  0.00E+00  0.00E+00  0.00E+00  0.00E+00  0.00E+00  0.00E+00
  0.00E+00  0.00E+00  0.00E+00  2.96E+03  0.00E+00  0.00E+00
  0.00E+00  0.00E+00  0.00E+00  0.00E+00  0.00E+00  0.00E+00
  0.00E+00  0.00E+00  0.00E+00  0.00E+00  0.00E+00  0.00E+00

   7 :   10301  10302
  1.24E+08  4.67E+05  3.98E+06 -5.57E+04 -1.10E+07 -7.23E+05
  4.67E+05  2.98E+07 -5.69E+06 -3.96E+05  1.96E+04 -6.44E+05
  3.98E+06 -5.69E+06  3.79E+07  8.62E+05  4.12E+05  9.81E+04
-5.57E+04 -3.96E+05  8.62E+05 -2.55E+06  4.86E+04  1.03E+04
-1.10E+07  1.96E+04  4.12E+05  4.86E+04  4.55E+06 -1.52E+05
-7.23E+05 -6.44E+05  9.81E+04  1.03E+04 -1.52E+05 -2.63E+06
--------------------------------------
=== Calculating Unbalance...
...Done.

=== Preparing PP3 visualization in file
assamblyNZ
...Done.

=== Launching PP3
...Done.

=== Writing files for Excite...
...Done.


下图是模态计算时的报错：

file:///C:/Users/np/Desktop/QQ%E5%9B%BE%E7%89%8720180623194935.png

帕尼尼煤老板

报错图片在这边

clhttgx

QQ28-23417178

zcd19930515

shaft modeler没有装配，重新装配下试试