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- 2003-3-22
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- 1970-1-1
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问题描述: 轴在轴套内转动,力加在轴承座的下侧。轴跟轴套间有间隙。最终目的是想算晃动,现在先试转动的情况。我采用了SOLID5热固耦合单元。 我想问题的关键在摩擦副部分实常数的定义,和转动约束的施加。
根据实验实际情况,我将力加在轴承座的底部。约束了轴心的位移。但我得到了随时间短暂上升然后迅速降低的温度场,从25降到0。据此推断,轴刚开始转动时,接触是存在的,然而轴的转动好象是把轴承座 抛 起来一样,然后接触就消失了,摩擦热也就没了。
VM229是大家经常模仿的例子,这里也曾讨论过。但那里面关于摩擦副接触状态的参考价值很小。请指教。
! SHAFT IS FIXED, FORCE APPLIED ON THE BOTTOM.
FINISH
/CLEAR
/TITLE, OSCILLATIORY MOTION OF JOURNAL AND BEARING
/FILNAME,THERMOMECHANICAL,
CSYS, 0
/PREP7
ET, 1, SOLID5
KEYOPT, 1, 1, 1
MP, EX, 1, 207E9,
MP, PRXY,1 ,0.3
MP, DENS, 1, 7860
MP, C, 1, 460
MP, KXX, 1, 52
MP, MU, 1, 0.12
MP, ALPX, 1, 1E-5
BLOCK, -0.1275, 0, -0.066, 0.066, 0.5, 0.54, !MODELING
BLOCK, -0.0575, -0.1275, 0.045, 0.066, 0.5, 0.54,
BLOCK, -0.0575, -0.1275, -0.045, -0.066, 0.5, 0.54,
CYLIND, 0.045, ,0.5, 0.54, 90, 270,
VSBV, 1, 2,
VSBV, 5, 3,
VSBV, 1, 4,
CYLIND, 0.0158, 0.045, 0.5, 0.54, 90, 270,
CYLIND, 0.0127, 0.0158, 0.5, 0.54, 90, 270,
WPLANE, , 0, 0, 0.5,
CYL4, 0, 0.00043, 0.01227, 90, , 270, 0.04
VGLUE, 1, 2, 3,
LESIZE, 47, , , 20, !MESHING
LESIZE, 58, , , 20,
LESIZE, 54, , , 3,
LESIZE, 62, , , 3,
VSWEEP, ALL
ALLSEL
ET, 2, TARGE170 !DEFINE CONTACT PAIR
ET, 3, CONTA173
KEYOPT, 2, 1, 0
KEYOPT, 3, 1, 1
KEYOPT, 3, 2,1
KEYOPT, 3, 5,1
R, 1, !DEFINE FACTORS RELATED TO FRICTION HEAT
RMORE, , , 1,
RMORE, , , 1, , , 0.5,
ASEL, S, AREA, , 20, ! SLEEVE AS TARGET SURFACE,
NSLA, S,
TYPE, 2,
ESURF
ALLSEL
ASEL, S, AREA, , 27, ! SHAFT AS CONTACT SURFACE,
NSLA, S,
TYPE, 3,
ESURF
ALLSEL
VSYMM, X, ALL !REFLECTION OF ELEMENTS
NUMMRG, ALL,
/SOLU
TREF, 25
TUNIF, 25
ANTYPE, TRANS
TIMINT, OFF, STRUC
TINTP, , , , 1.0
!NLGEOM, ON
F, 1218, FY, -2224 !APPLY LOAD AT THE BASE BOTTOM
F, 1219, FY, -2224
LOCAL, 11, 1, 0, 0.00043, 0, !DEFINE LOCAL COORDINATE SYSTEM ON THE SHAFT
VSEL, S, VOLU, , 3, 4 !ROTATING ROUND Z AXIS AT ORIGIN?
NSLV, S
OMEGA, , , 10
ALLSEL
D, 577, ALL !fix shaft center
D, 945, ALL
DA, 2, UX !LEFT SURFACE OF THE BASE
DA, 48, UX !RIGHT SURFACE OF THE BASE
TIME, 2
AUTO,ON
NSUB,10,100,10
OUTRES,ALL,-10
NROP,UNSYM
SOLVE
SAVE
/SHOW,WIN32C,
/CONTOUR,ALL,100,
/POST26
NSOL,2,936,TEMP,
NSOL,3,512,TEMP,
PLVAR,2, 3, |
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