请教Ansys Help中例题的部分命令流，非常感谢！

simiu

原文中的问题描述：
The actuator silicon structure is comprised of a thin arm connected to a wide arm, flexure, and two anchors as shown in the figure below. In addition to providing mechanical support, the anchors also serve as electrical and thermal connections. The actuator operates on the principle of differential thermal expansion between the thin and wide arms. When a voltage difference is applied to the anchors, current flows through the arms producing Joule heating. Because of the width difference, the thin arm of the Microactuator has a higher electrical resistance than the wide arm, and therefore it heats up more than the wide arm. The non-uniform Joule heating produces a non-uniform thermal expansion, and actuator tip deflection. A 3-D static structural-thermoelectric analysis is performed to determine the tip deflection and temperature distribution in the Microactuator when a 15 volt difference is applied to the anchors. Radiative and convective surface heat transfers are also taken into account, which is important for accurate modeling of the actuator. The Microactuator dimensions (device D2 in the reference) and material properties of doped single-crystal silicon used for the simulation were taken from the reference above. The temperature dependent convective heat losses were applied to all the actuator surfaces; however, they may have been applied in a different way than in the reference.


这个命令流如下：

/title, Electro-Thermal Microactuator
/nopr
d1=40e-6               ! Microactuator dimensions, m
d2=255e-6
d3=40e-6
d4=330e-6
d5=1900e-6
d6=90e-6
d7=75e-6
d8=352e-6
d9=352e-6
d11=200e-6

! === Loads
Vlt=15                 ! Voltage difference, Volt
Tblk=300               ! Bulk temperature, K

/VIEW,1,1,2,3
/PREP7
et,1,SOLID227,111      ! Structural-thermoelectric tetrahedron
! === Material properties
mp,EX,1,169e9          ! Young modulus, Pa
mp,PRXY,1,0.3          ! Poisson's ratio
mp,RSVX,1,4.2e-4       ! Electrical resistivity, Ohm-m
! Temperature table for ALPX and KXX
mptemp,1,300,400,500,600,700,800  
mptemp,7,900,1000,1100,1200,1300,1400
mptemp,13,1500
! Coefficients of thermal expansion data table, 1/K
mpdata,ALPX,1,1,2.568e-6,3.212e-6,3.594e-6,3.831e-6,3.987e-6,4.099e-6
mpdata,ALPX,1,7,4.185e-6,4.258e-6,4.323e-6,4.384e-6,4.442e-6,4.5e-6
mpdata,ALPX,1,13,4.556e-6  
! Thermal conductivity data table, W/(m-K)
mpdata,KXX,1,1,146.4,98.3,73.2,57.5,49.2,41.8
mpdata,KXX,1,7,37.6,34.5,31.4,28.2,27.2,26.1
mpdata,KXX,1,13,25.1        

tref,Tblk             ! Reference temperature

! === Solid model     
k,1,0,0               ! Define keypoints
k,2,0,d9
k,3,d8,d9
k,4,d8,d1
k,5,d8+d4+d5,d1
k,6,d8+d4+d5,-(d7+d2)
k,7,d8+d4,-(d7+d2)
k,8,d8+d4,-(d7+d3)
k,9,d8,-(d7+d3)
k,10,d8,-(d7+d9)
k,11,0,-(d7+d9)
k,12,0,-d7
k,13,d8+d4+d5-d6,-d7
k,14,d8+d4+d5-d6,0
a,1,2,3,4,5,6,7,8,9,10,11,12,13,14 ! Define area
vext,1,,,,,d11       ! Extrude area by the out-of-plane size

! === Finite element model
lsel,s,line,,31,42   ! Element size along out-of-plane dimension
lesize,all,d11
lsel,s,line,,1,3     ! Element size along anchor sides
lsel,a,line,,9,11
lsel,a,line,,15,17
lsel,a,line,,23,25
lesize,all,d9/2
lsel,s,line,,5       ! Element size along side walls
lsel,a,line,,19
lesize,all,(d1+d2+d7)/6
lsel,s,line,,13      ! Element size along the end connection
lsel,a,line,,27
lesize,all,d7/3
lsel,s,line,,8       ! Element size along the flexure
lsel,a,line,,22
lesize,all,d4/6
lsel,s,line,,4       ! Element size along the thin arm
lsel,a,line,,18
lesize,all,(d4+d5)/30
lsel,s,line,,14
lsel,a,line,,28
lesize,all,(d8+d4+d5-d6)/40
lsel,s,line,,7       ! Element size along the wide arm
lsel,a,line,,21
lesize,all,d2/5
lsel,s,line,,12
lsel,a,line,,26
lesize,all,(d8+d4+d5-d6)/35
lsel,s,line,,6
lsel,a,line,,20
lesize,all,d5/25
lsel,all
vmesh,1              ! Mesh the volume

! === DOF constraints on the anchors
nsel,s,loc,x,0,d8
nsel,r,loc,z,0       ! Bottom surface
d,all,UX,0,,,,UY,UZ
d,all,TEMP,Tblk
nsel,all

nsel,s,loc,x,0,d8
nsel,r,loc,y,-(d7+d9),-d7
cp,1,VOLT,all
n_gr=ndnext(0)
d,n_gr,VOLT,0
nsel,s,loc,x,0,d8
nsel,r,loc,y,0,d9
cp,2,VOLT,all
n_vlt=ndnext(0)
d,n_vlt,VOLT,Vlt
nsel,all
！为什么这里只对选定面积耦合volt，而不是temp或是curr?

! === Radiosity boundary conditions
sf,all,RDSF,0.7,1    ! Surface-to-surface radiation load
spctemp,1,Tblk       ! Ambient temperature
stef,5.6704e-8       ! Stefan-Boltzman radiation constant, J/(K)4(m)2(s)

! === Temperature dependent convection boundary conditions
Mptemp               ! Initialize temperature table
! Temperature table for thermal loading
mptemp,1,300,500,700,900,1100,1300
mptemp,7,1500

问什么这段要对每一个面分别进行加载和约束？
而且似乎每个面积分别进行了约束或载荷的非线性定义
! === Upper face

asel,s,area,,2       ! Thin arm and flexure
nsla,s,1
nsel,r,loc,x,d8,d8+d4+d5-d6
nsel,r,loc,y,0,d1
sf,all,CONV,-1,Tblk
nsla,s,1
nsel,r,loc,x,d8,d8+d4
nsel,r,loc,y,-(d3+d7),-d7
sf,all,CONV,-1,Tblk
mpdata,HF,1,1,17.8,60.0,65.6,68.9,71.1,72.6
mpdata,HF,1,7,73.2
！请问这两句蓝色的命令流是针对它前面那句sf,all,conv,-1,tblk还是针对下面接着所选定面积的sf的？
nsla,s,1              ! Wide arm
nsel,r,loc,x,d8+d4,d8+d4+d5-d6
nsel,r,loc,y,-(d2+d7),-d7
sf,all,CONV,-2,Tblk
mpdata,HF,2,1,11.2,37.9,41.4,43.4,44.8,45.7
mpdata,HF,2,7,46.0
nsla,s,1              ! End connection
nsel,r,loc,x,d8+d4+d5-d6,d8+d4+d5
sf,all,CONV,-3,Tblk
mpdata,HF,3,1,15.,50.9,55.5,58.2,60.,61.2
mpdata,HF,3,7,62.7
nsla,s,1              ! Anchors
nsel,r,loc,x,0,d8
sf,all,CONV,-4,Tblk
mpdata,HF,4,1,10.3,35.0,38.2,40.,41.3,42.1
mpdata,HF,4,7,42.5
! === Bottom face
asel,s,area,,1
nsla,s,1             ! Thin arm and flexure
nsel,r,loc,x,d8,d8+d4+d5-d6
nsel,r,loc,y,0,d1
sf,all,CONV,-5,Tblk
nsla,s,1
nsel,r,loc,x,d8,d8+d4
nsel,r,loc,y,-(d3+d7),-d7
sf,all,CONV,-5,Tblk
mpdata,HF,5,1,22.4,69.3,76.1,80.5,83.7,86.0
mpdata,HF,5,7,87.5
nsla,s,1             ! Wide arm
nsel,r,loc,x,d8+d4,d8+d4+d5-d6
nsel,r,loc,y,-(d2+d7),-d7
sf,all,CONV,-6,Tblk
mpdata,HF,6,1,13.,39.6,43.6,46.,47.6,49.
mpdata,HF,6,7,50.1
nsla,s,1             ! End connection
nsel,r,loc,x,d8+d4+d5-d6,d8+d4+d5
sf,all,CONV,-7,Tblk
mpdata,HF,7,1,24.,73.8,81.,85.7,89.2,91.6
mpdata,HF,7,7,93.2
nsel,all
asel,all
! === Side walls (anchors and area between the thin and wide
! arms are excluded)
asel,s,area,,6,16
asel,u,area,,11,16
sfa,all,,CONV,-8,Tblk
asel,all
mpdata,HF,8,1,929,1193,1397,1597,1791,1982
mpdata,HF,8,7,2176
finish

/SOLU
antype,static
cnvtol,f,1,1.e-4     ! Define convergence tolerances
cnvtol,heat,1,1.e-5
cnvtol,amps,1,1.e-5
nlgeom,on            ! Large deflection analysis
solve
finish

/POST1
/show,win32c
/cont,1,18
/dscale,1,10
plnsol,u,sum         ! Plot displacement vector sum
plnsol,temp          ! Plot temperature
finish

不知道这个帖子是否该发在这个板块，如果不对，烦请版主帮忙转移，

[ 本帖最后由 simiu 于 2008-9-24 22:24 编辑 ]

simiu

顶一个，希望有人知道

perch88

1. 人家是在加电压呢
2. 一会儿往前说，一会儿往后说。。。不是分别耦合的话，那不都一样的自由度了么？
3. 材料定义。一般情况下在solve之前都有效