Re:자중을 고려한 Lifting Lug에 대한 질문입니다. 도와주세요.

[지원이 아빠^^]

1.ansys

 +메뉴로

Main Menu>Preprocessor>Loads>Define Loads>Delete>Structural>Inertia>Gravity

Main Menu>Solution>Define Loads>Apply>Structural>Inertia>Gravity>Global

+ 명령어 (lb)

MP,DENS,1,9345E-8     ! 단위 확인할것, 0.9345 x 10^-4 lb-sec²/in⁴
ACEL,,,386.4             ! GRAVITY ! 단위확인할것. 386.4 in/sec²)

 < Kgf=9.81Kgm m/sec^2 = 9.81N 이므로,  Kgm=(1/9.81)Kgf sec^2/m. 즉,

   Kgm/m^3 = (1/9.81)Kgf sec^2/m^4 임, 중량을 9.81로 나누면,사용할 density의 단위는 Kgf sec^2/m^4가 됨 >

+ 명령어 (kgf)

mp,ex,1,200000000000., ! Pa

mp,dens,1,7850., ! kg/m³

acel,,,9.80665 ! acel,x,y,z 방향 확인 할것

2. WB

첨부 참조 자중-워크밴치.ppt

하중적용에서 standard earth gravity !! 중력방향 그래프 확인할것.

vm158참조..예제

q. 물속에 들어 있는 플라스틱 실린더..가 물속에 어느정도 기게 잠기는지에 대한 문제?

Material Properties

ρ = 8000 kg/m³

ρ_w = 1000 kg/m³

g = 9.807 m/sec²

///이하 로그 파일///

/VERIFY,VM158
/PREP7  
MP,PRXY,,0.3
/TITLE, VM158, MOTION OF A BOBBING BUOY
C***            ELEMENTARY THEORETICAL FLUID MECHANICS, BRENKERT, PAGE 37
ANTYPE,TRANS
NLGEOM,ON                     ! LARGE DISPLACEMENTS
ET,1,PIPE59,,,,,,,1
R,1,1,.03                     ! DIAMETER, WALL THICKNESS
RMORE,,,,.3                   ! DRAG COEFFICIENT
MP,EX,1,21E10
MP,DENS,1,8000
MP,PRXY,1,0.3
TB,WATER,1
TBDATA,3,30                   ! DEPTH
TBDATA,4,1000                 ! WATER DENSITY
N,1,,,-9
N,7,,,1
FILL
E,1,2
EGEN,6,1,1
FINISH
/SOLU   
NSUBST,20                     ! 20 SUBSTEPS
CNVTOL,U                      ! CONVERGENCE BASED ON DISPLACEMENTS
CNVTOL,F                      ! CONVERGENCE BASED ON FORCES
OUTPR,BASIC,LAST
OUTRES,NSOL,1
KBC,1
ALPHAD,3                      ! MASS DAMPING FOR SLOW DYNAMICS
ACEL,,,9.807
D,1,UX,,,7,,UY,ROTX,ROTY,ROTZ ! CONSTRAIN ALL BUT UZ DOF
TIME,30
SOLVE
FINISH
/POST26
NSOL,2,1,U,Z
PRVAR,2
/GRID,1
/AXLAB,Y,DISP
PLVAR,2