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发表于 2003-6-19 21:49:41
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来自 台湾
回复: 回复: 【讨论】初学乍练,恳请各位高手给会诊一下问题所在
恕刪...
* ELEMENT, TYPE=SPRINGA, ELSET=SPRINGS
10, 1, 10
11, 9, 11
keyword應該是*ELEMENT,不能有空格
*SPRING, ELSET = SPRINGS
,10000
這裡有誤,elset的名字前面不能有空格
另外,springA單元定義第一行應為空白,第二行第一個值才是Spring stiffness
...
* STEP, name=Frequency, PERTURBATION
同理,*STEP不能有空格
*BOUNDARY
10,ENCASTRE
11,ENCASTRE
*FREQUENCY
6,
*END STEP
*Boundary如要在STEP裡宣告,要擺到*Frequency後面
或者,擺到Step外的Model Data裡
經修改後計算得前六項Natural frequency為:
0.0000, 9.67450E-05, 55.187, 101.08, 271.29, 678.22
完整input file
==========================================================================
*HEADING
Determine the normal modes and natural frequencies of a spirng-beam-mass system
Units - lb, -s, in
*NODE
1, 0.00, 0.00
9, 40.00, 0.00
10, 0.00, -1.00
11, 40.00, -1.00
*NGEN
1, 9
*ELEMENT, TYPE = B21
1, 1, 2
*ELGEN, ELSET=BEAM
1,8
*BEAM SECTION, SECTION=RECTANGULAR, ELSET=BEAM, MATERIAL=USER_DEFINED
2., 2.
*ELEMENT, TYPE = MASS, ELSET=CMASS
9, 2
*MASS, ELSET=CMASS
0.02,
*ELEMENT, TYPE =SPRINGA, ELSET=SPRINGS
10, 1, 10
11, 9, 11
*SPRING, ELSET=SPRINGS
10000
*MATERIAL, NAME=USER_DEFINED
*ELASTIC
30.E6, 0.29
*DENSITY
0.0007
*STEP, name=Frequency, PERTURBATION
*FREQUENCY
6,
*BOUNDARY
10,ENCASTRE
11,ENCASTRE
*END STEP
=============================================================================== |
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