瞬态声场分析后处理问题

wanderingvoice

请教各位老师，我用ansys，在平板声学的那个例子中，加了瞬态激励，分十个子步，后处理时提取随时间变化的声压值，结果全为零。请教各位这是怎么回事？也没看到有关瞬态声学的例子。

wanderingvoice

求高手指导

tzhdacy

你这样问别人很难回答，最好把你的模型和思路法在帖子里供大家参考。最好有命令流了

wanderingvoice

这是那个平板声学的例子，只是我用了瞬态分析。
PREP7
ET,1,SOLID45                   !壳单元 类型1
ET,2,FLUID30                   ! acoustic fluid element with ux & uy(0-Structure present at interface (unsymmetric element matrix))
ET,3,130                       ! acoustic infinite line element
r,3,0.3,0,0
ET,4,FLUID30,,1,0              ! acoustic fluid element without ux & uy(1-No structure at the interface (symmetric element matrix))
! material properties
!材料1为铁
MP,EX,1,2.1E11
MP,DENS,1,7800
MP,NUXY,1,0.3
!材料2为空气介质
MP,DENS,2,1.21
MP,SONC,2,344

!建立模型
wprot,0,-90,0
SPHERE,,0.3,0,180                      !SPHERE, RAD1, RAD2, THETA1, THETA2
wprot,0,90,0
BLOCK,0,0.1, -0.002, 0.002, -0.1, 0    !BLOCK, X1, X2, Y1, Y2, Z1, Z2
BLOCK,-0.1,0, -0.002, 0.002, -0.1, 0
VGLUE,2,3
VOVLAP,1,2                             !Overlaps volumes
VOVLAP,3,4



!对编号为2的体划分网格
lesize,9,,,20,1
lesize,19,,,20,1
lesize,14,,,20,1
lesize,18,,,20,1
lesize,11,,,20,1
lesize,16,,,20,1
lesize,12,,,20,1
lesize,17,,,20,1
lesize,8,,,4,1
lesize,15,,,4,1
lesize,13,,,4,1
lesize,10,,,4,1


VSEL,s,,,2
VATT,1,,1
mshkey,1    !Specifies whether free meshing or mapped meshing should be used to mesh a model.1— Use mapped meshing.
VMESH,2
alls

!对编号为4的体划分网格
lesize,32,,,20,1
lesize,31,,,20,1
lesize,35,,,20,1
lesize,33,,,20,1
lesize,28,,,20,1
lesize,34,,,20,1
lesize,20,,,4,1
lesize,27,,,4,1

VSEL,s,,,4
VATT,1,,1
mshkey,1    !Specifies whether free meshing or mapped meshing should be used to mesh a model.1— Use mapped meshing.
VMESH,4
alls
!对编号为1的体划分网格(此步骤划分网格需要手动进行)
VSEL,s,,,1
VATT,2,,2  !指定的材料属性为空气介质(与结构耦合)
SMRT,1
VMESH,1
alls
!修改不与平板（结构）接触单元的材料类型类型为空气介质（不与结构耦合）
esel,s,type,,1
nsle,s
esln,s,0  
nsle,s
esel,inve
nsle,s
emodif,all,type,4
alls


!在边界生成吸收单元。（使用单元fluid130）

Asel,s,,,1,2
NSLA,S,1
type,3
real,3
mat,2
esurf                 !Generates elements overlaid on the free faces of existing selected elements.
alls

!建立流－固接触面
Asel,s,,,8
Asel,A,,,10
Asel,A,,,7
Asel,A,,,5
Asel,A,,,19
Asel,A,,,15
Asel,A,,,17
Asel,A,,,20

NSLA,S,1

esel,s,type,,2
sf,all,fsi,1
alls

/solu
antype,trans
trnopt,full,nodamp
da,6,all
da,18,all
time,0.02
nsubst,10
kbc,1
outpr,basic,1
outres,all,1
f,1,fy,10
alls
solve
/post26
nsol,2,4632,pres,pres
plvar,2

wanderingvoice

这样能得到某节点声压的变化。可是选定时间之后，画出空气的声压级分布，就全是灰色的。

superpoliceman

5# wanderingvoice


f,1,fy,10
你加的是静力，却用瞬态分析，当然没有结果