小弟刚开始学拓扑优化，望大虾帮帮忙看看原因出在哪里
*** OptiStruct defaults set from:
install config file: D:\Program Files\Altair\12.0\/hwsolvers/hwsolver.cfg.
NOTE # 9199
MSGLMT=BRIEF is active, following messages will be suppressed:
741 742 1935 1052 1305 1436 1437 1051 1931 1932 2010
Use MSGLMT=STRICT (e.g. in config file) to turn back full printing.
NOTE # 1929
Created RAM scratch area: total size 200 MB.
*** WARNING # 1848
Topology Optimization without Minimum Member Size Control activated.
Using DTPL card, or DOPTPRM,MINDIM is recommended.
*** INFORMATION #743
The total number of rigid elements, whose rotational dependent d.o.f.
are removed because there is no need to constrain those d.o.f., is 4
NOTE #1847
AUTOMATIC SCREENING is activated.
Use "DSCREEN,AUTO,OFF" to turn off this effect.
************************************************************************
OPTIMIZATION FILE AND PARAMETER INFORMATION :
---------------------------------------------
FEM model file : F:/lianxi_yuanwenjian/1/1_12co12com.fem
Output files prefix : F:/lianxi_yuanwenjian/1/1_12co12com
Model read from files:
F:/lianxi_yuanwenjian/1/1_12co12com.fem
************************************************************************
************************************************************************
FINITE ELEMENT MODEL DATA INFORMATION :
---------------------------------------
Total # of Grids (Structural) : 2153
Total # of Elements : 1466
Total # of Rigid Elements : 4
Total # of Rigid Element Constraints : 360
Total # of Degrees of Freedom : 6826
Total # of Non-zero Stiffness Terms: 222049
Element Type Information
------------------------
CHEXA Elements : 1380
CPENTA Elements : 86
Load and Boundary Information
-----------------------------
FORCE Sets : 2
SPC Sets : 1
Material and Property Information
---------------------------------
PSOLID Cards : 2
MAT1 Cards : 1
************************************************************************
************************************************************************
OPTIMIZATION PROBLEM PARAMETERS :
---------------------------------
Objective Function: Minimize Volume
------------------
Response Summary :
------------------
Number of volume responses : 1
Number of displacement responses : 2
------------------------
Static Subcase Summary :
------------------------
---------- ----------------
Subcase ID SPC ID FORCE ID
---------- ----------------
1 7 8
2 7 5
---------- ----------------
---------------------------
Design Parameters Summary :
---------------------------
Total # of topology design elements : 1200
Total # of topology cards : 1
Total Volume of Design Material : 2.7991E+05
Total Mass of Design Material : 0.0000E+00
Volume of Non-Design Material : 3.9136E+04
Mass of Non-Design Material : 0.0000E+00
Solid Design Elements:PSOLID
--------------------- --------
2
---------------------------------
Optimization Parameters Summary :
---------------------------------
Initial Material Fraction : 0.9000
Minimum Element Volume Fraction : 0.0100
Discreteness Parameter : 1.0000
Topology Optimization Method : Density Method
Maximum Number of Iterations : 30
Convergence Tolerance : 5.0000E-03
Step Size (Topology) : 0.5000
Checkerboard Control : Off
Run Type : Topology Optimization
-------------------------------
Topology Optimization Summary :
-------------------------------
-------- ----------- ----------- -----------
DTPL ID Minimum Maximum Minimum
Member Size Member SizeGap Size
-------- ----------- ----------- -----------
1
-------- ----------- ----------- -----------
-------- ------- ------- ----------- ----------- ----------- -----------
DTPL IDPattern PatternDraw Dir. Stamping No Hole Extrusion
Repet.Group. Constraints Constraints Constraints Constraints
-------- ------- ------- ----------- ----------- ----------- -----------
1 NONE NONE NONE NONE NONE NONE
-------- ------- ------- ----------- ----------- ----------- -----------
Restart from previous solution: No
Scratch file directory : ./
Free space:11300 MB
Number of CPU processors : 1
************************************************************************
************************************************************************
MEMORY ESTIMATION INFORMATION :
-------------------------------
Solver Type is:Sparse-Matrix Solver
Direct Method
Current Memory (RAM) : 100 MB
In addition a ramdisk area was allocated in memory : 200 MB
Estimated Minimum Memory (RAM) for Out of Core Solution : 11 MB
Recommended Memory (RAM) for Out of Core Solution : 12 MB
Recommended Memory (RAM) for In-Core Solution : 22 MB
DISK SPACE ESTIMATION INFORMATION :
-----------------------------------
Estimated Disk Space for Output Data Files : 6 MB
Estimated Scratch Disk Space for In-Core Solution : 31 MB
Estimated Scratch Disk Space for Out of Core Solution : 50 MB
************************************************************************
BEGINNING OPTIMIZATION SOLUTION ....
************************************************************************
OPTIMIZATION HISTORY INFORMATION :
----------------------------------
ITERATION 0
内存太小了。 andm 发表于 2014-7-13 14:00
内存太小了。
谢谢请问你知道这个问题出在哪里了吗
*** ERROR #312 ***
In static load case 1
the compliance is negative or large 9.857769E+10
Optimization/buckling analysis cannot be performed
due to possible rigid body mode
*** ERROR #312 ***
In static load case 2
the compliance is negative or large 1.008859E+12
Optimization/buckling analysis cannot be performed
due to possible rigid body mode
(Running in-core solution)
Objective Function (Minimize VOLUM) =2.91055E+05
Maximum Constraint Violation % =0.10570E+13
Design Volume Fraction =9.00000E-01 Mass =0.00000E+00
Subcase Compliance
19.857769E+10
21.008859E+12
31.694027E+01
柔度太大，可能是相对于你施加的载荷，你给的约束上下限太小，模型根据柔度计算的的位移超出了位移约束上下限值。适当放宽约束上下限试试。 andm 发表于 2014-7-14 12:52
柔度太大，可能是相对于你施加的载荷，你给的约束上下限太小，模型根据柔度计算的的位移超出了位移约束上下 ...
谢谢，自由度的约束自己弄错了，约束错了一个
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