Modal tahlil - FrontISTR Multilingual Documentation

Ushbu tahlilda tutorial/15_eigen_spring ma’lumotlaridan foydalaniladi.

Tahlil obyekti¶

Tahlil obyektlari oldingi bo‘limdagi Nochiziqli statik tahlil (giperelastiklik, 2-qism) bilan bir xil prujinalardir.

Band	Tavsif	Izohlar
Tahlil turi	Modal tahlil	!SOLUTION, TYPE=EIGEN
Tugunlar soni	78,771
Elementlar soni	46,454
Element turi	10 tugunli kvadratik tetraedr element	!ELEMENT,TYPE=342
Material nomi	MAT1	!MATERIAL,NAME=MAT1
Chegaraviy shartlar	Cheklash
Matritsa yechuvchisi	To‘g‘ridan-to‘g‘ri usul	!SOLVER,METHOD=MUMPS

Tahlil mazmuni¶

4.4.1-rasmda ko‘rsatilgan cheklangan sirtning ko‘chishi cheklanadi va beshinchi modagacha modal tahlil bajariladi. Tahlil boshqaruv ma’lumotlari quyida ko‘rsatilgan.

Prujina shakli

4.4.1-rasm: Prujina shakli

Tahlil boshqaruv ma’lumotlari `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

Tahlil tartibi¶

FrontISTR ning fistr1 buyrug‘ini bajaring.

cd FrontISTR/tutorial/15_eigen_spring
fistr1 -t 4

(4 ta oqimda bajariladi.)

Tahlil natijalari¶

Natija ma’lumotlari fayli spring.res.0.3 yordamida uchinchi tartibli tebranish modasi (prujinaning y yo‘nalishida siqilishi va cho‘zilishi) REVOCAP_PrePost bilan yaratiladi va 4.15.1-rasmda ko‘rsatiladi. Deformatsiya koeffitsiyenti 1000 ga o‘rnatiladi. Bundan tashqari, tahlil natijalarining sonli ma’lumoti sifatida tahlil natijalari log fayliga chiqarilgan tabiiy chastotalar ro‘yxati quyida ko‘rsatilgan.

Prujinaning uchinchi tebranish modasi

4.15.1-rasm: Prujinaning uchinchi tebranish modasi

Tahlil natijasi log fayli `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