基于ANSYS的平板结构声学仿真分析

平板声学分析Ansys
具体计算结果见附件
下面是程序清单：
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/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
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!第一种后处理方式，得到空气介质的声压分布，单位为分贝
/solu
antype,harmic
hropt,full
f,131,fY,1000.
alls
nsubst,10
kbc,1
HARF,337,337 !加载80Hz的频率
SOLVE
!对与结构耦合的空气单元和未与结构耦合的空气单元进行后处理，得到声压分布
/post1
SET,FIRST
esel,s,type,,2
esel,a,type,,4
PLESOL, NMISC,4, 0,1.0
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!第二种分析后处理方式，
!使用谐波分析法对530－540Hz频率之间进行频率扫描计算第一阶弯曲模态，从而检测到结构模型的固有频率
/solu
antype,harmic
hropt,full
f,131,fY,1000.
alls
nsubst,10
kbc,1
HARF,530,540 !加载频率530－540
SOLVE
!检测到结构模型的固有频率
/post26
plcplx,0
nsol,2,1,u,x,d1ux
store
conjug,3,2
prod,4,2,3
sqrt,5,4
*get,uxmx,vari,5,extrem,tmax
/COM -------------------------------------------------------------
/COM Expected Result:
/COM
/COM The following "uxmx" should equal
/COM -------------------------------------------------------------
*status,uxmx
finish