Uchanganuzi wa eigenvalue¶

Kwa uchanganuzi huu, tumia data katika tutorial/15_eigen_spring.

Kitu kinachochanganuliwa¶

Kitu kinachochanganuliwa ni spring ileile kama katika sehemu iliyotangulia, Uchanganuzi tuli usio wa mstari (hyperelasticity sehemu ya 2).

Kipengee	Maelezo	Dokezo
Aina ya uchanganuzi	Uchanganuzi wa eigenvalue	!SOLUTION, TYPE=EIGEN
Idadi ya nodi	78,771
Idadi ya elementi	46,454
Element type	Elementi ya tetrahedron quadratic ya nodi 10	!ELEMENT,TYPE=342
Jina la sifa ya nyenzo	MAT1	!MATERIAL,NAME=MAT1
Boundary condition	Kizuizi
Njia ya kutatua matrix	Njia ya moja kwa moja	!SOLVER,METHOD=MUMPS

Maudhui ya uchanganuzi¶

Tunazuia displacement ya uso wa kizuizi ulioonyeshwa kwenye Mchoro 4.4.1 na kufanya uchanganuzi wa eigenvalue hadi modi ya 5. Data ya udhibiti wa uchanganuzi imeonyeshwa hapa chini.

Umbo la spring

Mchoro 4.4.1　Umbo la spring

Data ya udhibiti wa uchanganuzi `spring.cnt`¶

#  Control File for FISTR
## Analysis Control
!VERSION
 3
!SOLUTION, TYPE=EIGEN
!EIGEN
 5, 1.0E-8, 60
!WRITE,RESULT
!WRITE,VISUAL
## Solver Control
### Boundary Condition
!BOUNDARY
 XFIX, 1, 1, 0.0
 YFIX, 2, 2, 0.0
 ZFIX, 3, 3, 0.0
### Material
# define in mesh file
### Solver Setting
!SOLVER,METHOD=MUMPS
## Post Control
!VISUAL,method=PSR
!surface_num=1
!surface 1
!output_type=VTK
!END

Utaratibu wa uchanganuzi¶

Tekeleza amri ya FrontISTR fistr1.

cd FrontISTR/tutorial/15_eigen_spring
fistr1 -t 4

(Huendeshwa kwa thread 4)

Matokeo ya uchanganuzi¶

Kwa kutumia faili ya matokeo spring.res.0.3, modi ya tatu ya mtetemo (compression/extension ya spring katika mwelekeo wa y) imeundwa kwa REVOCAP_PrePost na kuonyeshwa kwenye Mchoro 4.15.1. Kipimo cha deformation kimewekwa kuwa 1000. Aidha, kama data ya nambari ya matokeo ya uchanganuzi, orodha ya natural frequency iliyotolewa kwenye faili ya log ya matokeo imeonyeshwa hapa chini.

Modi ya tatu ya mtetemo wa spring

Mchoro 4.15.1　Modi ya tatu ya mtetemo wa spring

Log ya matokeo ya uchanganuzi `0.log`¶

 fstr_setup: OK

********************************
*RESULT OF EIGEN VALUE ANALYSIS*
********************************

NUMBER OF ITERATIONS =       47
TOTAL MASS =   3.4184E-06

                   ANGLE       FREQUENCY   PARTICIPATION FACTOR                EFFECTIVE MASS
  NO.  EIGENVALUE  FREQUENCY   (HZ)        X           Y           Z           X           Y           Z
  ---  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ----------  ----------
    1  7.8307E+06  2.7983E+03  4.4537E+02  1.0289E+00 -8.8939E-02 -7.0520E-01  1.3006E-06  9.7176E-09  6.1094E-07
    2  7.8716E+06  2.8056E+03  4.4653E+02  6.9687E-01  1.0755E-01  1.0106E+00  6.1290E-07  1.4598E-08  1.2890E-06
    3  3.2600E+07  5.7097E+03  9.0872E+02  4.8622E-03  1.2364E+00 -7.9172E-02  4.0069E-11  2.5908E-06  1.0624E-08
    4  3.8366E+07  6.1940E+03  9.8581E+02 -2.9654E-02  3.3849E-01 -6.7819E-03  9.8232E-10  1.2799E-07  5.1379E-11
    5  1.2931E+08  1.1372E+04  1.8098E+03  5.1856E-01  4.7604E-02  6.7703E-01  2.8377E-07  2.3915E-09  4.8371E-07

    Iter.#   Eigenvalue    Abs. Residual
    1  7.8307E+06  2.4730E-08
    2  7.8716E+06  1.0144E-08
    3  3.2600E+07  1.9866E-07
    4  3.8366E+07  3.1463E-08
    5  1.2931E+08  2.6103E-07