【固体与水接触模态分析】模态提取有问题
问题：我设置成提取50阶模态，但程序只算到2阶就停止了，这是为什么？log如下：
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** A FINITE ELEMENT PROGRAM FOR **
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** VERSION - 8.9.0(build 12.07.2012) **
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Initial ADINA memory allocation- 850.7 mb(or212.7 mw)
* * *W A R N I N G* * *
MESH GLUING WITH ELEMENT BIRTH/DEATH OPTION CANNOT BE USED
IN LINEAR ANALYSIS. THE DEATH/BIRTH OPTION IS IGNORED.
***** WARNING *****
DEFORMATION DEPENDENT CENTRIFUGAL LOADING CANNOT BE USED
IN MODE SUPERPOSITION ANALYSIS. DEFORMATION INDEPENDENT
LOADING IS USED INSTEAD.
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* *
* THIS IS A LINEARDYNAMIC SOLUTION *
* *
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1PROGRAM ADINA - VERSION 8.9.0 (build 12.07.2012) *** NO HEADING DEFINED ***
* * *W A R N I N G* * *
TO OBTAIN FREQUENCIES USING POTENTIAL-BASED FLUID
ELEMENTS, YOU SHOULD ALLOW FOR RIGID-BODY MODES.
1PROGRAM ADINA - VERSION 8.9.0 (build 12.07.2012) *** NO HEADING DEFINED ***
S O L U T I O N B Y S P A R S E S O L V E R
TOTAL SYSTEM DATA
NUMBER OF EQUATIONS . . . . . . . . . . . . .(NEQ)= 64550
NUMBER OF NON-ZERO MATRIX TERMS. . . . . . . (NZC)= 1094009
MEMORY AVAILABLE FOR STORAGE (in megawords) . . . . = 212
NUMBER OF PROCESSORS USED. . . . . . . . . (NPROC)= 1
M E M O R Y R E Q U I R E M E N T (in words)
AVAILABLE MEMORY FOR THE ADINA PROGRAM (MSTORE) = 212686250
ESTIMATED MEMORY FOR IN-CORE STORAGE .......(IOPTIM=3)= 15351673
ESTIMATED MEMORY FOR OUT-OF-CORE STORAGE....(IOPTIM=2)= 15351673
NOTE: WHEN SPARSE SOLVER IS USED - ADDITIONAL MEMORY
IS REQUIRED - PLEASE SEE BELOW INFORMATION
RELATED TO SPARSE SOLVERS.
MAXIMUM REQUESTED (TEMPORARY) MEMORY (in words)...... = 15351673
NOTE:
IN CASE OF FREQUENCY ANALYSIS, IOPTIM=3 AND IOPTIM=2
ARE EQUIVALENT.
IN CASE OF SUBSPACE ITERATION METHOD,IOPTIM=3SHOWS
THE AMOUNT OF MEMORY REQUIRED TO STORE (ALSO) ALL
SUBSPACE VECTORS IN-CORE.
IN-CORE STORAGE FLAG . . . . . . . . . . . (IOPTIM)= 2
1PROGRAM ADINA - VERSION 8.9.0 (build 12.07.2012) *** NO HEADING DEFINED ***
F R E Q U E N C Y A N A L Y S I S
*****************************************************************************
Available total memory . . . . . . . . . . . . . 850.7 mb
Memory required without the solver . . . . . . . 101.7 mb
*****************************************************************************
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Allocated memory without the solver. . . . . . : 101.7 mb
Memory used without the solver . . . . . . . . : 101.7 mb
*****************************************************************************
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* *
* <<<<< SPARSE SOLVER INFORMATION >>>>> *
* *
* NUMBER OF NON-ZERO TERMS IN FACTORIZED MATRIX......= 16987055*
* MEMORY USED BY THE SOLVER (in words)...............= 35440999*
* TOTAL MEMORY USED BY THE PROGRAM (in words)........= 60877805*
* << IN-CORE SOLUTION >> *
*****************************************************************************
Memory used by the in-core sparse solver. . : 141.8 mb
Total memory used by the program. . . . . . : 243.5 mb
Frequency number = 1 Frequency (cycles/sec) =0.00000E+00
Frequency number = 2 Frequency (cycles/sec) =1.89572E+01
***ERROR PRE-MATURE EXIT FROM *SECAAA*
ITERATION ABANDONED FOR ROOT NUMBER = 3
NUMBER OF ITERATIONS PERFORMED =41
E I G E N V A L U E S
(SHIFTED BY RBMSH = -0.100000000000E+00 )
0.100000000000E+000.141876806754E+05
THE FOLLOWING ARE PHYSICAL ERROR BOUNDS ON THE EIGENVALUES
0.189606589045E-090.421841208145E-10
1PROGRAM ADINA - VERSION 8.9.0 (build 12.07.2012) *** NO HEADING DEFINED ***
F R E Q U E N C I E S
FREQUENCY NUMBER FREQUENCY (RAD/SEC) FREQUENCY (CYCLES/SEC) PERIOD (SECONDS)
1 0.1000E-04 0.1592E-05 0.6283E+06
2 0.1191E+03 0.1896E+02 0.5275E-01
NOTE - READ TIME UNIT 'SEC' AS OTHER TIME UNIT IF OTHER TIME UNIT IS USED
S U M M A R Y O F A N A L Y S I S
***** WARNING *****
ONLY 2 FREQUENCIES CONVERGED, WHICH ARE LESS THAN
50 REQUESTED FREQUENCIES
1PROGRAM ADINA - VERSION 8.9.0 (build 12.07.2012) *** NO HEADING DEFINED ***
***NOTE*** WE RESET THE NUMBER OF MODES USED
IN THE MODE SUPERPOSITION (NMODES) TO THE
NUMBER OF MODES ACTUALLY CALCULATED
M O D A L S T R E S S E S A N D F O R C E S
S U M M A T I O N O F R E A C T I O N S(X,Y,Z - GLOBAL COORDINATES)
(FOR SELECTED NODES ONLY)
FORCE-X = -1.8914961E-11 FORCE-Y = -1.8916544E-11 FORCE-Z = -2.8120500E-09
S U M M A T I O N O F R E A C T I O N S(X,Y,Z - GLOBAL COORDINATES)
(FOR SELECTED NODES ONLY)
FORCE-X = -1.5677304E-13 FORCE-Y = -4.2873757E-13 FORCE-Z = -6.3148713E-07
M O D A L P A R T I C I P A T I O N F A C T O R S
EXCITATION IN DIRECTION 1 FREQUENCY 1 GAMA = 0.00000E+00
EXCITATION IN DIRECTION 1 FREQUENCY 2 GAMA = 0.11309E-17
EXCITATION IN DIRECTION 2 FREQUENCY 1 GAMA = 0.00000E+00
EXCITATION IN DIRECTION 2 FREQUENCY 2 GAMA = 0.38003E-17
EXCITATION IN DIRECTION 3 FREQUENCY 1 GAMA = 0.00000E+00
EXCITATION IN DIRECTION 3 FREQUENCY 2 GAMA = 0.61981E-11
1PROGRAM ADINA - VERSION 8.9.0 (build 12.07.2012) *** NO HEADING DEFINED ***
S O L U T I O N T I M E L O G (IN SEC)
FOR PROBLEM
*** NO HEADING DEFINED ***
INPUT PHASE. . . . . . . . . . . . . . . . . . 3.97
SUBSTRUCTURES INPUT PHASE. . . . . . . . . . . . 0.00
INITIALIZATIONS. . . . . . . . . . . . . . . . . 0.00
ASSEMBLAGE OF LINEAR STIFFNESS,EFFECTIVE STIFF-
NESS,MASS MATRICES AND LOAD VECTORS . . . . . . 4.44
FREQUENCY (OR BUCKLING) ANALYSIS . . . . . . . . 474.24
INITIAL CALCULATIONS FOR MODE SUPERPOSITION
ANALYSIS . . . . . . . . . 18.51
TRIANGULARIZATION OF LINEAR (EFFECTIVE)
STIFFNESS MATRIX. . . . . 0.00
STEP-BY-STEP SOLUTION ( 0 TIME STEPS)
CALCULATION OF EFFECTIVE LOAD VECTORS. . . 0.00
UPDATING EFFECTIVE STIFFNESS MATRICES
AND RHS VECTOR FOR NONLINEARITIES. . . . . 0.00
UPDATING EFFECTIVE STIFFNESS MATRIX FOR
CENTRIFUGAL DEFORMATION DEPENDENT LOADING. . 0.00
MODE SUPERPOSITION . . . . . . . . . . . . . 0.00
SOLUTION OF EQUATIONS. . . . . . . . . . . 0.00
EQUILIBRIUM ITERATIONS (TOTAL) . . . . . . . 0.00
CALCULATION AND PRINTING OF DISPLACE-
MENTS, VELOCITIES, AND ACCELERATIONS . . . . 0.00
CALCULATION AND PRINTING OF STRESSES . . . . 0.00
FRACTURE MECHANICS . . . . . . . . . . . . . 0.00
STEP-BY-STEP TOTAL. . . 0.02
CALCULATION AND PRINTING OF SUBSTRUCTURE
INTERNAL RESPONSES. . . . . . . . . 0.00
T O T A L S O L U T I O N T I M E (SEC) . . . . . 501.49
MEMORY USED BY THE SPARSE SOLVER= 35.4mw (141.8mb)
TOTAL MEMORY USED BY THE PROGRAM= 60.9mw (243.5mb)
说明你这个只有两阶的模态嘛 武汉游侠 发表于 2013-12-25 10:48
说明你这个只有两阶的模态嘛
大神你好。我这个应该不止两个模态的，因为一个圆平板可以计算好多模态的，不知我这样理解对不对？还是哪个地方设置有错误？ 武汉游侠 发表于 2013-12-25 10:48
说明你这个只有两阶的模态嘛
是不是模态的提取与固体单元的选择有关，比如，如果是用3D实体单元划分实体，节点自由度为3，然后只能提取3个自由度？ tyut1989 发表于 2013-12-25 14:44
是不是模态的提取与固体单元的选择有关，比如，如果是用3D实体单元划分实体，节点自由度为3，然后只能提 ...
不是节点自由度，而是模型的自由度。
流固耦合则不是这样的，毕竟此时还会有流体的模态，也就是流体也有自由度的。 武汉游侠 发表于 2013-12-26 12:41
不是节点自由度，而是模型的自由度。
流固耦合则不是这样的，毕竟此时还会有流体的模态，也就是流体也有 ...
谢谢大神指导！
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