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发表于 2015-12-31 09:15:57
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来自 安徽合肥
我也懂得不是很多,目前我正在做一个驾驶室的振动疲劳分析,也要用到频率响应分析。小模型都没问题,但是换为大模型后就出现了下面的问题
*** USER FATAL MESSAGE 6683 (FRLGA)
ALL COMPUTED EXCITATION FREQUENCIES ARE OUTSIDE THE RANGE F1 AND F2 FOR FREQ4 AND/OR FREQ5
BULK DATA ENTRIES, OR THERE ARE NO FREQi BULK DATA ENTRIES SPECIFIED.
PROGRAMMER INFORMATION: INPUT FILE 4 DOES NOT EXIST.
0FATAL ERROR
1 * * * END OF JOB * * *
No Symbolic Replacement variables or values were specified.
下面的是我的卡片设置,你帮我看看是什么问题呢
$$ Executive Control Cards
SOL SEDFREQ
TIME 10000
CEND
$$ Case Control Cards
ECHO = NONE
STRESS(SORT1,PLOT,PHASE,CORNER) = all
SPC = 103
DLOAD = 102
SDAMPING = 2
FREQUENCY = 4
METHOD=1
CEND
$$ Bulk Data Cards
BEGIN BULK
PARAM,HFREQ,10000.0
PARAM,POST,-1
PARAM,AUTOSPC,YES
EIGRL,1,,,500,0,,,MASS
中间是单元数据
$ Dynamic Load
TABLED2,5,0.0,,,,,,,+A
+A,0.0,1.0,500.0,1.0,ENDT
SPCD,101,1008839,3,-1.0
SPC,103,1008839,3,0.0
RLOAD2,102,101,,,5,,ACCE
TABDMP1,2,CRIT,,,,,,,+DA
+DA,0.0,0.1,500.0,0.1,ENDT
$$ FREQUENCY RESPONSE
FREQ1,4,1.0,1.0,5
ENDDATA
我的FREQ1都已经是1—6HZ的范围内了,还是出现这个问题,请问是怎么回事,感激不尽.如果网格单元质量不是很好的话会不会出现这个问题 |
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