How can I select nodes in a cylinder?

[mat215]

Hello,
I'm a beginner in Ansys and I have made the model of a piezoscanner, but at the moment I'm not able to select the exterior nodes of my tube!

!Geometriparameter des Piezo
OD = 6.35e-3 !Außendurchmesser (m)
ID = 5.35e-3 !Innendurchmesser (m)
L = 10e-3 !30e-3 !Länge


ET,1,SOLID5,3 ! 3-D COUPLED-FIELD

...

MAT,1
TYPE,1
CYL4,0,0,ID/2,0,ID/3+OD/6,0,L
CYL4,0,0,ID/3+OD/6,0,ID/6+OD/3,0,L
CYL4,0,0,ID/6+OD/3,0,OD/2,0,L
VGLUE,ALL

Regards

 

[meshparts]

Hi,

just define a cylindrical coordinate system and then select the nodes at the distance of the exterior area:

local,1000,1
nsel,s,loc,x,od ! note that in cylindrical coordinate x is the radius

Regards
Alex

 

[mat215]

Hi Alex,

Thank you for your help!

Regards
Matthias

 

[beijixiongjia]

i think : Command:'nsel,s,ext' can also do that

 

[mat215]

Hi,

With the command:'nsel,s,ext' I got the nodes inside th hole of my tube,too!

Another question: I want to select only the nodes in a specific angle.
I tried this command: 'nsel,r,ang,xy,?,?', with degrees, with pi and so on, but I only get 0nodes or all nodes I already had!

Regards
Matthias

 

[meshparts]

Hi,

to select the nodes in a specific angle you use also the keyword 'loc':

nsel,r,loc,y,startangle,endangle

Here is the y coordinate the angle, since the coordinate are cylindrical. Asys uses the same notations (x,y,z) for each coordinate regardless of the used coordinate system.

Regards,
Alex