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标题: MECHANICA版块,Structure→Analyses/studies中的一个疑问 [打印本页]

作者: idiot8120 时间: 2005-4-30 08:19
标题: MECHANICA版块,Structure→Analyses/studies中的一个疑问
我在建好模型后,进行结构设计的有限元分析Structure→Analyses/studies,新建New Static。run后,看分析结果：点快捷按钮Display Study Status,打开Run Status界面。其中有
RMS Stress Error Estimates:

         Load Set       Stress Error  % of Max Prin Str
         ----------------  ------------  -----------------
         LoadSet1          4.48e+00    3.6% of  1.25e+02
这样一部分，这是什么？Stress Error？这不是错误应力的意思么？他代表什么？对分析结果的准确度有什么影响？他与分析结果、真真的应力答案之间有什么关系？请高人帮忙解答一下。

作者: idiot8120 时间: 2005-5-1 10:39
居然没人帮助回答,可笑的是连看的人都没有,真是,这是什么论坛

作者: 冰雨7176 时间: 2005-5-1 21:35
你这人好没礼貌，stress error是应力错误，你设置边界的时候有问题

作者: 冰雨7176 时间: 2005-5-1 21:36
你的应力超出了最大值

作者: idiot8120 时间: 2005-5-6 08:11
请问怎么在PROE/M中怎么设置边界?怎么让他不超出最大应力值?怎么设置?

作者: 冰雨7176 时间: 2005-5-7 01:05
你在做什么东西拿来我看看我现在用2005m100不会用里面的分析情愿亮，我过几天给你搞，

作者: ZGBIAO653 时间: 2005-5-7 07:44

idiot8120 wrote:
居然没人帮助回答,可笑的是连看的人都没有,真是,这是什么论坛

讲话注意点,这是学习的地方.

作者: idiot8120 时间: 2005-5-8 08:39
冰雨7176兄弟，能不能说一下，你的分析步骤
按照分析步骤，Structrue→Materials→Constraints→Loads→Analyses/studies→New Static→Run→Results
其中需要什么注意的么？按我心理想是不是在设置“约束”时有要求？究竟是怎样设置边界问题的？请冰雨7176兄弟赐教。
真是惭愧，我不能直接把我要分析的东西给你，因为这是公司的技术产品，不能泄的。

作者: idiot8120 时间: 2005-5-8 15:51
------------------------------------------------------------
Pro/MECHANICA STRUCTURE Version 24.8(823)
Summary for Design Study "CLZ_7A3_100_Analysis3"
Sun May 08, 2005 15:07:22
------------------------------------------------------------

Run Settings
   Memory allocation for block solver: 128.0

Parallel Processing Status
  &nbsp

arallel task limit for current run: 2
  &nbsp

arallel task limit for current platform:    64
   Number of processors detected automatically: 2
Checking the model before creating elements...
These checks take into account the fact that AutoGEM will
automatically create elements in volumes with material
properties, on surfaces with shell properties, and on curves
with beam section properties.

   Generate elements automatically.
Checking the model after creating elements...

No errors were found in the model.

Pro/MECHANICA STRUCTURE Model Summary

  &nbsp

rincipal System of Units: unit_system1

   Length:       mm
   Force:          kg-f
   Time:          sec
   Temperature:    C

   Model Type: Three Dimensional

  &nbsp

oints:             1423
   Edges:             7477
   Faces:             10924

   Springs:                0
   Masses:                0
   Beams:                0
   Shells:                0
   Solids:             4878

   Elements:          4878

------------------------------------------------------------

Standard Design Study

Static Analysis "CLZ_7A3_100_Analysis3":

   Convergence Method: Multiple-Pass Adaptive
  &nbsp

lotting Grid:    4

   Convergence Loop Log:                      (15:07:38)

   >> Pass  1 <<
         Calculating Element Equations          (15:07:39)
            Total Number of Equations: 3681
            Maximum Edge Order:             1
         Solving Equations                      (15:07:41)
         Post-Processing Solution             (15:07:41)
         Calculating Disp and Stress Results    (15:07:41)
         Checking Convergence                   (15:07:59)
            Elements Not Converged:    4878
            Edges Not Converged:       7477
            Measure Convergence:       100.0%
            Local Disp/Energy Index: 100.0%
            Global RMS Stress Index: 100.0%
         Resource Check                         (15:07:59)
            Elapsed Time    (sec):    38.05
            CPU Time       (sec):    21.75
            Memory Usage    (kb):    348460
            Wrk Dir Dsk Usage (kb):    38912

   >> Pass  2 <<
         Calculating Element Equations          (15:08:00)
            Total Number of Equations: 24888
            Maximum Edge Order:             2
         Solving Equations                      (15:08:04)
         Post-Processing Solution             (15:08:06)
         Calculating Disp and Stress Results    (15:08:08)
         Checking Convergence                   (15:08:28)
            Elements Not Converged:    2445
            Edges Not Converged:       4985
            Measure Convergence:       42.6%
            Local Disp/Energy Index: 100.0%
            Global RMS Stress Index:    54.3%
         Resource Check                         (15:08:29)
            Elapsed Time    (sec):    67.33
            CPU Time       (sec):    34.39
            Memory Usage    (kb):    348460
            Wrk Dir Dsk Usage (kb):    38912

   >> Pass  3 <<
         Calculating Element Equations          (15:08:29)
            Total Number of Equations: 89430
            Maximum Edge Order:             4
         Solving Equations                      (15:08:38)
         Post-Processing Solution             (15:09:56)
         Calculating Disp and Stress Results    (15:10:06)
         Checking Convergence                   (15:10:41)
            Elements Not Converged:       696
            Edges Not Converged:          0
            Measure Convergence:       37.8%
            Local Disp/Energy Index:    70.0%
            Global RMS Stress Index:    11.6%
         Resource Check                         (15:10:46)
            Elapsed Time    (sec):    204.49
            CPU Time       (sec):    90.94
            Memory Usage    (kb):    348460
            Wrk Dir Dsk Usage (kb):    347136

   >> Pass  4 <<
         Calculating Element Equations          (15:10:48)
            Total Number of Equations:  173391
            Maximum Edge Order:             5
         Solving Equations                      (15:11:09)
         Post-Processing Solution             (15:14:51)
         Calculating Disp and Stress Results    (15:15:13)
         Checking Convergence                   (15:15:56)
            Elements Not Converged:       51
            Edges Not Converged:          0
            Measure Convergence:       94.3%
            Local Disp/Energy Index:    33.5%
            Global RMS Stress Index:    11.8%
         Resource Check                         (15:16:12)
            Elapsed Time    (sec):    530.50
            CPU Time       (sec):    285.97
            Memory Usage    (kb):    348460
            Wrk Dir Dsk Usage (kb):    897024

   >> Pass  5 <<
         Calculating Element Equations          (15:16:15)
            Total Number of Equations:  268080
            Maximum Edge Order:             6
         Solving Equations                      (15:17:27)
         Post-Processing Solution             (15:27:56)
         Calculating Disp and Stress Results    (15:28:56)
         Checking Convergence                   (15:29:57)
            Elements Not Converged:       3
            Edges Not Converged:          0
            Measure Convergence:       7.4%
            Local Disp/Energy Index:    13.5%
            Global RMS Stress Index:    6.6%

         RMS Stress Error Estimates:

         Load Set       Stress Error  % of Max Prin Str
         ----------------  ------------  -----------------
         LoadSet1          4.19e+00    3.0% of  1.42e+02

         Resource Check                         (15:30:55)
            Elapsed Time    (sec): 1413.46
            CPU Time       (sec):    804.72
            Memory Usage    (kb):    370476
            Wrk Dir Dsk Usage (kb): 1743872

   The analysis converged to within 10% on
   measures.

   Total Mass of Model:  2.799500e-03

   Total Cost of Model:  0.000000e+00

   Mass Moments of Inertia about WCS Origin:

     Ixx:  8.76916e+01
     Ixy:  1.30182e-05  Iyy:  8.48909e+01
     Ixz: -5.84720e-01  Iyz:  9.60954e-02  Izz:  6.58692e+00

   Principal MMOI and Principal Axes Relative to WCS Origin:

            Max Prin          Mid Prin          Min Prin
           8.76958e+01       8.48910e+01       6.58258e+00

   WCS X:  9.99974e-01       2.51182e-04       7.20887e-03
   WCS Y: -2.42342e-04       9.99999e-01    -1.22711e-03
   WCS Z: -7.20917e-03       1.22533e-03       9.99973e-01

   Center of Mass Location Relative to WCS Origin:
                  ( 1.39243e+00, -2.28927e-01,  1.50000e+02)

   Mass Moments of Inertia about the Center of Mass:

     Ixx:  2.47026e+01
     Ixy: -8.79362e-04  Iyy:  2.18966e+01
     Ixz: -4.85298e-06  Iyz: -3.69856e-05  Izz:  6.58134e+00

   Principal MMOI and Principal Axes Relative to COM:

            Max Prin          Mid Prin          Min Prin
           2.47026e+01       2.18966e+01       6.58134e+00

   WCS X:  1.00000e+00       3.13388e-04       2.67923e-07
   WCS Y: -3.13388e-04       1.00000e+00       2.41497e-06
   WCS Z: -2.67167e-07    -2.41505e-06       1.00000e+00

   Constraint Set: ConstraintSet1

   Load Set: LoadSet1

      Resultant Load on Model:
         in global X direction: -1.000003e+05
         in global Y direction: -1.527045e-11
         in global Z direction:  1.191648e-10

      Measures:

           Name             Value    Convergence
      --------------    -------------  -----------
      max_beam_bending: 0.000000e+00    0.0%
      max_beam_tensile: 0.000000e+00    0.0%
      max_beam_torsion: 0.000000e+00    0.0%
      max_beam_total:    0.000000e+00    0.0%
      max_disp_mag:    8.877181e-02    0.3%
      max_disp_x:       -8.713472e-02    0.3%
      max_disp_y:       1.696981e-02    0.3%
      max_disp_z:       -2.306235e-02    0.4%
      max_prin_mag:    1.416550e+02    7.6%
      max_rot_mag:       0.000000e+00    0.0%
      max_rot_x:       0.000000e+00    0.0%
      max_rot_y:       0.000000e+00    0.0%
      max_rot_z:       0.000000e+00    0.0%
      max_stress_prin: 1.416550e+02    7.6%
      max_stress_vm:    1.130378e+02    4.1%
      max_stress_xx:    1.074103e+02    8.7%
      max_stress_xy:    -2.904926e+01    11.2%
      max_stress_xz:    -5.352575e+01    9.7%
      max_stress_yy:    4.737863e+01    9.3%
      max_stress_yz:    -4.183371e+01    3.4%
      max_stress_zz:    1.107628e+02    17.1%
      min_stress_prin: -1.251579e+02    19.8%
      strain_energy:    3.597022e+03    0.3%
      point0:          1.550465e+01    1.1%
      point1:          1.472329e+01    1.1%
      point2:          1.461476e+01    3.2%
      point3:          1.438270e+01    2.0%
      point4:          1.190665e+01    7.4%

Analysis "CLZ_7A3_100_Analysis3" Completed  (15:30:56)

------------------------------------------------------------

Memory and Disk Usage:

   Machine Type: Windows NT/x86
   RAM Allocation for Solver (megabytes): 128.0

   Total Elapsed Time (seconds): 1416.78
   Total CPU Time    (seconds): 805.53
   Maximum Memory Usage (kilobytes): 370476
   Working Directory Disk Usage (kilobytes): 1743872

   Results Directory Size (kilobytes):
   69536 .\CLZ_7A3_100_Analysis3

   Maximum Data Base Working File Sizes (kilobytes):
   1048576 .\CLZ_7A3_100_Analysis3.tmp\kblk1.bas
   250880 .\CLZ_7A3_100_Analysis3.tmp\kblk2.bas
   389120 .\CLZ_7A3_100_Analysis3.tmp\kel1.bas
   55296 .\CLZ_7A3_100_Analysis3.tmp\oel1.bas

------------------------------------------------------------
Run Completed
Sun May 08, 2005 15:30:58
------------------------------------------------------------

作者: yangyonghe 时间: 2009-1-10 15:51
那是应力误差的意思，是指应力误差是最大主应力的百分之几

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